Linus Torvalds [Thu, 19 Dec 2024 16:50:05 +0000 (08:50 -0800)]
Merge tag 'pwm/for-6.13-rc4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux
Pull pwm fix from Uwe Kleine-König:
"Fix regression in pwm-stm32 driver when converting to new waveform
support
Fabrice Gasnier found and fixed a regression I introduced with
v6.13-rc1 when converting the stm32 pwm driver to support the new
waveform stuff. On some hardware variants this completely broke the
driver"
* tag 'pwm/for-6.13-rc4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux:
pwm: stm32: Fix complementary output in round_waveform_tohw()
Linus Torvalds [Thu, 19 Dec 2024 16:45:37 +0000 (08:45 -0800)]
Merge tag 'v6.13-rc3-ksmbd-server-fixes' of git://git.samba.org/ksmbd
Pull smb server fixes from Steve French:
- Two fixes for better handling maximum outstanding requests
- Fix simultaneous negotiate protocol race
* tag 'v6.13-rc3-ksmbd-server-fixes' of git://git.samba.org/ksmbd:
ksmbd: conn lock to serialize smb2 negotiate
ksmbd: fix broken transfers when exceeding max simultaneous operations
ksmbd: count all requests in req_running counter
Linus Torvalds [Wed, 18 Dec 2024 22:17:21 +0000 (14:17 -0800)]
Merge tag 'for-6.13-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux
Pull btrfs fixes from David Sterba:
- tree-checker catches invalid number of inline extent references
- zoned mode fixes:
- enhance zone append IO command so it also detects emulated writes
- handle bio splitting at sectorsize boundary
- when deleting a snapshot, fix a condition for visiting nodes in reloc
trees
* tag 'for-6.13-rc3-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux:
btrfs: tree-checker: reject inline extent items with 0 ref count
btrfs: split bios to the fs sector size boundary
btrfs: use bio_is_zone_append() in the completion handler
btrfs: fix improper generation check in snapshot delete
Linus Torvalds [Wed, 18 Dec 2024 20:52:57 +0000 (12:52 -0800)]
Merge tag 'cxl-fixes-6.13-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl
Pull cxl fixes from Ira Weiny:
- prevent probe failure when non-critical RAS unmasking fails
- fix CXL 1.1 link status sysfs attribute
- fix 4 way (and greater) switch interleave region creation
* tag 'cxl-fixes-6.13-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/cxl/cxl:
cxl/region: Fix region creation for greater than x2 switches
cxl/pci: Check dport->regs.rcd_pcie_cap availability before accessing
cxl/pci: Fix potential bogus return value upon successful probing
Linus Torvalds [Wed, 18 Dec 2024 18:03:33 +0000 (10:03 -0800)]
Merge tag 'trace-v6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
Pull tracing fixes from Steven Rostedt:
"Replace trace_check_vprintf() with test_event_printk() and
ignore_event()
The function test_event_printk() checks on boot up if the trace event
printf() formats dereference any pointers, and if they do, it then
looks at the arguments to make sure that the pointers they dereference
will exist in the event on the ring buffer. If they do not, it issues
a WARN_ON() as it is a likely bug.
But this isn't the case for the strings that can be dereferenced with
"%s", as some trace events (notably RCU and some IPI events) save a
pointer to a static string in the ring buffer. As the string it points
to lives as long as the kernel is running, it is not a bug to
reference it, as it is guaranteed to be there when the event is read.
But it is also possible (and a common bug) to point to some allocated
string that could be freed before the trace event is read and the
dereference is to bad memory. This case requires a run time check.
The previous way to handle this was with trace_check_vprintf() that
would process the printf format piece by piece and send what it didn't
care about to vsnprintf() to handle arguments that were not strings.
This kept it from having to reimplement vsnprintf(). But it relied on
va_list implementation and for architectures that copied the va_list
and did not pass it by reference, it wasn't even possible to do this
check and it would be skipped. As 64bit x86 passed va_list by
reference, most events were tested and this kept out bugs where
strings would have been dereferenced after being freed.
Instead of relying on the implementation of va_list, extend the boot
up test_event_printk() function to validate all the "%s" strings that
can be validated at boot, and for the few events that point to strings
outside the ring buffer, flag both the event and the field that is
dereferenced as "needs_test". Then before the event is printed, a call
to ignore_event() is made, and if the event has the flag set, it
iterates all its fields and for every field that is to be tested, it
will read the pointer directly from the event in the ring buffer and
make sure that it is valid. If the pointer is not valid, it will print
a WARN_ON(), print out to the trace that the event has unsafe memory
and ignore the print format.
With this new update, the trace_check_vprintf() can be safely removed
and now all events can be verified regardless of architecture"
* tag 'trace-v6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
tracing: Check "%s" dereference via the field and not the TP_printk format
tracing: Add "%s" check in test_event_printk()
tracing: Add missing helper functions in event pointer dereference check
tracing: Fix test_event_printk() to process entire print argument
Linus Torvalds [Wed, 18 Dec 2024 17:55:55 +0000 (09:55 -0800)]
Merge tag 'hyperv-fixes-signed-20241217' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux
Pull hyperv fixes from Wei Liu:
- Various fixes to Hyper-V tools in the kernel tree (Dexuan Cui, Olaf
Hering, Vitaly Kuznetsov)
- Fix a bug in the Hyper-V TSC page based sched_clock() (Naman Jain)
- Two bug fixes in the Hyper-V utility functions (Michael Kelley)
- Convert open-coded timeouts to secs_to_jiffies() in Hyper-V drivers
(Easwar Hariharan)
* tag 'hyperv-fixes-signed-20241217' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux:
tools/hv: reduce resource usage in hv_kvp_daemon
tools/hv: add a .gitignore file
tools/hv: reduce resouce usage in hv_get_dns_info helper
hv/hv_kvp_daemon: Pass NIC name to hv_get_dns_info as well
Drivers: hv: util: Avoid accessing a ringbuffer not initialized yet
Drivers: hv: util: Don't force error code to ENODEV in util_probe()
tools/hv: terminate fcopy daemon if read from uio fails
drivers: hv: Convert open-coded timeouts to secs_to_jiffies()
tools: hv: change permissions of NetworkManager configuration file
x86/hyperv: Fix hv tsc page based sched_clock for hibernation
tools: hv: Fix a complier warning in the fcopy uio daemon
Juergen Gross [Wed, 18 Dec 2024 08:02:28 +0000 (09:02 +0100)]
x86/static-call: fix 32-bit build
In 32-bit x86 builds CONFIG_STATIC_CALL_INLINE isn't set, leading to
static_call_initialized not being available.
Define it as "0" in that case.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au> Fixes: 0ef8047b737d ("x86/static-call: provide a way to do very early static-call updates") Signed-off-by: Juergen Gross <jgross@suse.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Fabrice Gasnier [Tue, 17 Dec 2024 15:00:21 +0000 (16:00 +0100)]
pwm: stm32: Fix complementary output in round_waveform_tohw()
When the timer supports complementary output, the CCxNE bit must be set
additionally to the CCxE bit. So to not overwrite the latter use |=
instead of = to set the former.
Nathan Chancellor [Thu, 21 Nov 2024 18:22:18 +0000 (11:22 -0700)]
hexagon: Disable constant extender optimization for LLVM prior to 19.1.0
The Hexagon-specific constant extender optimization in LLVM may crash on
Linux kernel code [1], such as fs/bcache/btree_io.c after
commit 32ed4a620c54 ("bcachefs: Btree path tracepoints") in 6.12:
clang: llvm/lib/Target/Hexagon/HexagonConstExtenders.cpp:745: bool (anonymous namespace)::HexagonConstExtenders::ExtRoot::operator<(const HCE::ExtRoot &) const: Assertion `ThisB->getParent() == OtherB->getParent()' failed.
Stack dump:
0. Program arguments: clang --target=hexagon-linux-musl ... fs/bcachefs/btree_io.c
1. <eof> parser at end of file
2. Code generation
3. Running pass 'Function Pass Manager' on module 'fs/bcachefs/btree_io.c'.
4. Running pass 'Hexagon constant-extender optimization' on function '@__btree_node_lock_nopath'
Without assertions enabled, there is just a hang during compilation.
This has been resolved in LLVM main (20.0.0) [2] and backported to LLVM
19.1.0 but the kernel supports LLVM 13.0.1 and newer, so disable the
constant expander optimization using the '-mllvm' option when using a
toolchain that is not fixed.
Qu Wenruo [Wed, 4 Dec 2024 03:00:46 +0000 (13:30 +1030)]
btrfs: tree-checker: reject inline extent items with 0 ref count
[BUG]
There is a bug report in the mailing list where btrfs_run_delayed_refs()
failed to drop the ref count for logical 25870311358464 num_bytes 2113536.
[CAUSE]
There is no concrete evidence yet, but considering 0 -> 1 is also a
single bit flipped, it's possible that hardware memory bitflip is
involved, causing the on-disk extent tree to be corrupted.
[FIX]
To prevent us reading such corrupted extent item, or writing such
damaged extent item back to disk, enhance the handling of
BTRFS_EXTENT_DATA_REF_KEY and BTRFS_SHARED_DATA_REF_KEY keys for both
inlined and key items, to detect such 0 ref count and reject them.
CC: stable@vger.kernel.org # 5.4+ Link: https://lore.kernel.org/linux-btrfs/7c69dd49-c346-4806-86e7-e6f863a66f48@app.fastmail.com/ Reported-by: Frankie Fisher <frankie@terrorise.me.uk> Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Qu Wenruo <wqu@suse.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Christoph Hellwig [Mon, 4 Nov 2024 06:26:33 +0000 (07:26 +0100)]
btrfs: split bios to the fs sector size boundary
Btrfs like other file systems can't really deal with I/O not aligned to
it's internal block size (which strangely is called sector size in
btrfs, for historical reasons), but the block layer split helper doesn't
even know about that.
Round down the split boundary so that all I/Os are aligned.
Fixes: d5e4377d5051 ("btrfs: split zone append bios in btrfs_submit_bio") CC: stable@vger.kernel.org # 6.12 Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Damien Le Moal <dlemoal@kernel.org> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Christoph Hellwig [Mon, 4 Nov 2024 06:26:32 +0000 (07:26 +0100)]
btrfs: use bio_is_zone_append() in the completion handler
Otherwise it won't catch bios turned into regular writes by the block
level zone write plugging. The additional test it adds is for emulated
zone append.
Fixes: 9b1ce7f0c6f8 ("block: Implement zone append emulation") CC: stable@vger.kernel.org # 6.12 Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: Damien Le Moal <dlemoal@kernel.org> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
Josef Bacik [Wed, 13 Nov 2024 16:11:55 +0000 (11:11 -0500)]
btrfs: fix improper generation check in snapshot delete
We have been using the following check
if (generation <= root->root_key.offset)
to make decisions about whether or not to visit a node during snapshot
delete. This is because for normal subvolumes this is set to 0, and for
snapshots it's set to the creation generation. The idea being that if
the generation of the node is less than or equal to our creation
generation then we don't need to visit that node, because it doesn't
belong to us, we can simply drop our reference and move on.
However reloc roots don't have their generation stored in
root->root_key.offset, instead that is the objectid of their
corresponding fs root. This means we can incorrectly not walk into
nodes that need to be dropped when deleting a reloc root.
There are a variety of consequences to making the wrong choice in two
distinct areas.
visit_node_for_delete()
1. False positive. We think we are newer than the block when we really
aren't. We don't visit the node and drop our reference to the node
and carry on. This would result in leaked space.
2. False negative. We do decide to walk down into a block that we
should have just dropped our reference to. However this means that
the child node will have refs > 1, so we will switch to
UPDATE_BACKREF, and then the subsequent walk_down_proc() will notice
that btrfs_header_owner(node) != root->root_key.objectid and it'll
break out of the loop, and then walk_up_proc() will drop our reference,
so this appears to be ok.
do_walk_down()
1. False positive. We are in UPDATE_BACKREF and incorrectly decide that
we are done and don't need to update the backref for our lower nodes.
This is another case that simply won't happen with relocation, as we
only have to do UPDATE_BACKREF if the node below us was shared and
didn't have FULL_BACKREF set, and since we don't own that node
because we're a reloc root we actually won't end up in this case.
2. False negative. Again this is tricky because as described above, we
simply wouldn't be here from relocation, because we don't own any of
the nodes because we never set btrfs_header_owner() to the reloc root
objectid, and we always use FULL_BACKREF, we never actually need to
set FULL_BACKREF on any children.
Having spent a lot of time stressing relocation/snapshot delete recently
I've not seen this pop in practice. But this is objectively incorrect,
so fix this to get the correct starting generation based on the root
we're dropping to keep me from thinking there's a problem here.
CC: stable@vger.kernel.org Reviewed-by: Filipe Manana <fdmanana@suse.com> Signed-off-by: Josef Bacik <josef@toxicpanda.com> Signed-off-by: David Sterba <dsterba@suse.com>
Linus Torvalds [Tue, 17 Dec 2024 17:14:31 +0000 (09:14 -0800)]
Merge tag 'ftrace-v6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace
Pull ftrace fixes from Steven Rostedt:
- Always try to initialize the idle functions when graph tracer starts
A bug was found that when a CPU is offline when graph tracing starts
and then comes online, that CPU is not traced. The fix to that was to
move the initialization of the idle shadow stack over to the hot plug
online logic, which also handle onlined CPUs. The issue was that it
removed the initialization of the shadow stack when graph tracing
starts, but the callbacks to the hot plug logic do nothing if graph
tracing isn't currently running. Although that fix fixed the onlining
of a CPU during tracing, it broke the CPUs that were already online.
- Have microblaze not try to get the "true parent" in function tracing
If function tracing and graph tracing are both enabled at the same
time the parent of the functions traced by the function tracer may
sometimes be the graph tracing trampoline. The graph tracing hijacks
the return pointer of the function to trace it, but that can
interfere with the function tracing parent output.
This was fixed by using the ftrace_graph_ret_addr() function passing
in the kernel stack pointer using the ftrace_regs_get_stack_pointer()
function. But Al Viro reported that Microblaze does not implement the
kernel_stack_pointer(regs) helper function that
ftrace_regs_get_stack_pointer() uses and fails to compile when
function graph tracing is enabled.
It was first thought that this was a microblaze issue, but the real
cause is that this only works when an architecture implements
HAVE_DYNAMIC_FTRACE_WITH_ARGS, as a requirement for that config is to
have ftrace always pass a valid ftrace_regs to the callbacks. That
also means that the architecture supports
ftrace_regs_get_stack_pointer()
Microblaze does not set HAVE_DYNAMIC_FTRACE_WITH_ARGS nor does it
implement ftrace_regs_get_stack_pointer() which caused it to fail to
build. Only implement the "true parent" logic if an architecture has
that config set"
* tag 'ftrace-v6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
ftrace: Do not find "true_parent" if HAVE_DYNAMIC_FTRACE_WITH_ARGS is not set
fgraph: Still initialize idle shadow stacks when starting
Linus Torvalds [Tue, 17 Dec 2024 17:09:32 +0000 (09:09 -0800)]
Merge tag 's390-6.13-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
Pull s390 fixes from Alexander Gordeev:
- Fix DirectMap accounting in /proc/meminfo file
- Fix strscpy() return code handling that led to "unsigned 'len' is
never less than zero" warning
- Fix the calculation determining whether to use three- or four-level
paging: account KMSAN modules metadata
* tag 's390-6.13-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
s390/mm: Consider KMSAN modules metadata for paging levels
s390/ipl: Fix never less than zero warning
s390/mm: Fix DirectMap accounting
Linus Torvalds [Tue, 17 Dec 2024 17:04:42 +0000 (09:04 -0800)]
Merge tag 'erofs-for-6.13-rc4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs
Pull erofs fixes from Gao Xiang:
"The first one fixes a syzbot UAF report caused by a commit introduced
in this cycle, but it also addresses a longstanding memory leak. The
second one resolves a PSI memstall mis-accounting issue.
The remaining patches switch file-backed mounts to use buffered I/Os
by default instead of direct I/Os, since the page cache of underlay
files is typically valid and maybe even dirty. This change also aligns
with the default policy of loopback devices. A mount option has been
added to try to use direct I/Os explicitly.
Summary:
- Fix (pcluster) memory leak and (sbi) UAF after umounting
- Fix a case of PSI memstall mis-accounting
- Use buffered I/Os by default for file-backed mounts"
* tag 'erofs-for-6.13-rc4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs:
erofs: use buffered I/O for file-backed mounts by default
erofs: reference `struct erofs_device_info` for erofs_map_dev
erofs: use `struct erofs_device_info` for the primary device
erofs: add erofs_sb_free() helper
MAINTAINERS: erofs: update Yue Hu's email address
erofs: fix PSI memstall accounting
erofs: fix rare pcluster memory leak after unmounting
Steven Rostedt [Tue, 17 Dec 2024 02:41:22 +0000 (21:41 -0500)]
tracing: Check "%s" dereference via the field and not the TP_printk format
The TP_printk() portion of a trace event is executed at the time a event
is read from the trace. This can happen seconds, minutes, hours, days,
months, years possibly later since the event was recorded. If the print
format contains a dereference to a string via "%s", and that string was
allocated, there's a chance that string could be freed before it is read
by the trace file.
To protect against such bugs, there are two functions that verify the
event. The first one is test_event_printk(), which is called when the
event is created. It reads the TP_printk() format as well as its arguments
to make sure nothing may be dereferencing a pointer that was not copied
into the ring buffer along with the event. If it is, it will trigger a
WARN_ON().
For strings that use "%s", it is not so easy. The string may not reside in
the ring buffer but may still be valid. Strings that are static and part
of the kernel proper which will not be freed for the life of the running
system, are safe to dereference. But to know if it is a pointer to a
static string or to something on the heap can not be determined until the
event is triggered.
This brings us to the second function that tests for the bad dereferencing
of strings, trace_check_vprintf(). It would walk through the printf format
looking for "%s", and when it finds it, it would validate that the pointer
is safe to read. If not, it would produces a WARN_ON() as well and write
into the ring buffer "[UNSAFE-MEMORY]".
The problem with this is how it used va_list to have vsnprintf() handle
all the cases that it didn't need to check. Instead of re-implementing
vsnprintf(), it would make a copy of the format up to the %s part, and
call vsnprintf() with the current va_list ap variable, where the ap would
then be ready to point at the string in question.
For architectures that passed va_list by reference this was possible. For
architectures that passed it by copy it was not. A test_can_verify()
function was used to differentiate between the two, and if it wasn't
possible, it would disable it.
Even for architectures where this was feasible, it was a stretch to rely
on such a method that is undocumented, and could cause issues later on
with new optimizations of the compiler.
Instead, the first function test_event_printk() was updated to look at
"%s" as well. If the "%s" argument is a pointer outside the event in the
ring buffer, it would find the field type of the event that is the problem
and mark the structure with a new flag called "needs_test". The event
itself will be marked by TRACE_EVENT_FL_TEST_STR to let it be known that
this event has a field that needs to be verified before the event can be
printed using the printf format.
When the event fields are created from the field type structure, the
fields would copy the field type's "needs_test" value.
Finally, before being printed, a new function ignore_event() is called
which will check if the event has the TEST_STR flag set (if not, it
returns false). If the flag is set, it then iterates through the events
fields looking for the ones that have the "needs_test" flag set.
Then it uses the offset field from the field structure to find the pointer
in the ring buffer event. It runs the tests to make sure that pointer is
safe to print and if not, it triggers the WARN_ON() and also adds to the
trace output that the event in question has an unsafe memory access.
The ignore_event() makes the trace_check_vprintf() obsolete so it is
removed.
Link: https://lore.kernel.org/all/CAHk-=wh3uOnqnZPpR0PeLZZtyWbZLboZ7cHLCKRWsocvs9Y7hQ@mail.gmail.com/ Cc: stable@vger.kernel.org Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/20241217024720.848621576@goodmis.org Fixes: 5013f454a352c ("tracing: Add check of trace event print fmts for dereferencing pointers") Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Steven Rostedt [Tue, 17 Dec 2024 02:41:21 +0000 (21:41 -0500)]
tracing: Add "%s" check in test_event_printk()
The test_event_printk() code makes sure that when a trace event is
registered, any dereferenced pointers in from the event's TP_printk() are
pointing to content in the ring buffer. But currently it does not handle
"%s", as there's cases where the string pointer saved in the ring buffer
points to a static string in the kernel that will never be freed. As that
is a valid case, the pointer needs to be checked at runtime.
Currently the runtime check is done via trace_check_vprintf(), but to not
have to replicate everything in vsnprintf() it does some logic with the
va_list that may not be reliable across architectures. In order to get rid
of that logic, more work in the test_event_printk() needs to be done. Some
of the strings can be validated at this time when it is obvious the string
is valid because the string will be saved in the ring buffer content.
Do all the validation of strings in the ring buffer at boot in
test_event_printk(), and make sure that the field of the strings that
point into the kernel are accessible. This will allow adding checks at
runtime that will validate the fields themselves and not rely on paring
the TP_printk() format at runtime.
Cc: stable@vger.kernel.org Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/20241217024720.685917008@goodmis.org Fixes: 5013f454a352c ("tracing: Add check of trace event print fmts for dereferencing pointers") Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Steven Rostedt [Tue, 17 Dec 2024 02:41:20 +0000 (21:41 -0500)]
tracing: Add missing helper functions in event pointer dereference check
The process_pointer() helper function looks to see if various trace event
macros are used. These macros are for storing data in the event. This
makes it safe to dereference as the dereference will then point into the
event on the ring buffer where the content of the data stays with the
event itself.
Steven Rostedt [Tue, 17 Dec 2024 02:41:19 +0000 (21:41 -0500)]
tracing: Fix test_event_printk() to process entire print argument
The test_event_printk() analyzes print formats of trace events looking for
cases where it may dereference a pointer that is not in the ring buffer
which can possibly be a bug when the trace event is read from the ring
buffer and the content of that pointer no longer exists.
The function needs to accurately go from one print format argument to the
next. It handles quotes and parenthesis that may be included in an
argument. When it finds the start of the next argument, it uses a simple
"c = strstr(fmt + i, ',')" to find the end of that argument!
In order to include "%s" dereferencing, it needs to process the entire
content of the print format argument and not just the content of the first
',' it finds. As there may be content like:
Which is an example of a full argument of an existing event. As the code
already handles finding the next print format argument, process the
argument at the end of it and not the start of it. This way it has both
the start of the argument as well as the end of it.
Add a helper function "process_pointer()" that will do the processing during
the loop as well as at the end. It also makes the code cleaner and easier
to read.
Cc: stable@vger.kernel.org Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: https://lore.kernel.org/20241217024720.362271189@goodmis.org Fixes: 5013f454a352c ("tracing: Add check of trace event print fmts for dereferencing pointers") Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Linus Torvalds [Tue, 17 Dec 2024 16:29:58 +0000 (08:29 -0800)]
Merge tag 'xsa465+xsa466-6.13-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip
Pull xen fixes from Juergen Gross:
"Fix xen netfront crash (XSA-465) and avoid using the hypercall page
that doesn't do speculation mitigations (XSA-466)"
* tag 'xsa465+xsa466-6.13-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
x86/xen: remove hypercall page
x86/xen: use new hypercall functions instead of hypercall page
x86/xen: add central hypercall functions
x86/xen: don't do PV iret hypercall through hypercall page
x86/static-call: provide a way to do very early static-call updates
objtool/x86: allow syscall instruction
x86: make get_cpu_vendor() accessible from Xen code
xen/netfront: fix crash when removing device
Juergen Gross [Thu, 17 Oct 2024 13:27:31 +0000 (15:27 +0200)]
x86/xen: remove hypercall page
The hypercall page is no longer needed. It can be removed, as from the
Xen perspective it is optional.
But, from Linux's perspective, it removes naked RET instructions that
escape the speculative protections that Call Depth Tracking and/or
Untrain Ret are trying to achieve.
This is part of XSA-466 / CVE-2024-53241.
Reported-by: Andrew Cooper <andrew.cooper3@citrix.com> Signed-off-by: Juergen Gross <jgross@suse.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com> Reviewed-by: Jan Beulich <jbeulich@suse.com>
Juergen Gross [Thu, 17 Oct 2024 09:00:52 +0000 (11:00 +0200)]
x86/xen: add central hypercall functions
Add generic hypercall functions usable for all normal (i.e. not iret)
hypercalls. Depending on the guest type and the processor vendor
different functions need to be used due to the to be used instruction
for entering the hypervisor:
- PV guests need to use syscall
- HVM/PVH guests on Intel need to use vmcall
- HVM/PVH guests on AMD and Hygon need to use vmmcall
As PVH guests need to issue hypercalls very early during boot, there
is a 4th hypercall function needed for HVM/PVH which can be used on
Intel and AMD processors. It will check the vendor type and then set
the Intel or AMD specific function to use via static_call().
This is part of XSA-466 / CVE-2024-53241.
Reported-by: Andrew Cooper <andrew.cooper3@citrix.com> Signed-off-by: Juergen Gross <jgross@suse.com> Co-developed-by: Peter Zijlstra <peterz@infradead.org>
Kees Cook [Fri, 13 Dec 2024 01:28:06 +0000 (17:28 -0800)]
fortify: Hide run-time copy size from value range tracking
GCC performs value range tracking for variables as a way to provide better
diagnostics. One place this is regularly seen is with warnings associated
with bounds-checking, e.g. -Wstringop-overflow, -Wstringop-overread,
-Warray-bounds, etc. In order to keep the signal-to-noise ratio high,
warnings aren't emitted when a value range spans the entire value range
representable by a given variable. For example:
unsigned int len;
char dst[8];
...
memcpy(dst, src, len);
If len's value is unknown, it has the full "unsigned int" range of [0,
UINT_MAX], and GCC's compile-time bounds checks against memcpy() will
be ignored. However, when a code path has been able to narrow the range:
if (len > 16)
return;
memcpy(dst, src, len);
Then the range will be updated for the execution path. Above, len is
now [0, 16] when reading memcpy(), so depending on other optimizations,
we might see a -Wstringop-overflow warning like:
error: '__builtin_memcpy' writing between 9 and 16 bytes into region of size 8 [-Werror=stringop-overflow]
When building with CONFIG_FORTIFY_SOURCE, the fortified run-time bounds
checking can appear to narrow value ranges of lengths for memcpy(),
depending on how the compiler constructs the execution paths during
optimization passes, due to the checks against the field sizes. For
example:
As intentionally designed, these checks only affect the kernel warnings
emitted at run-time and do not block the potentially overflowing memcpy(),
so GCC thinks it needs to produce a warning about the resulting value
range that might be reaching the memcpy().
We have seen this manifest a few times now, with the most recent being
with cpumasks:
In function ‘bitmap_copy’,
inlined from ‘cpumask_copy’ at ./include/linux/cpumask.h:839:2,
inlined from ‘__padata_set_cpumasks’ at kernel/padata.c:730:2:
./include/linux/fortify-string.h:114:33: error: ‘__builtin_memcpy’ reading between 257 and 536870904 bytes from a region of size 256 [-Werror=stringop-overread]
114 | #define __underlying_memcpy __builtin_memcpy
| ^
./include/linux/fortify-string.h:633:9: note: in expansion of macro ‘__underlying_memcpy’
633 | __underlying_##op(p, q, __fortify_size); \
| ^~~~~~~~~~~~~
./include/linux/fortify-string.h:678:26: note: in expansion of macro ‘__fortify_memcpy_chk’
678 | #define memcpy(p, q, s) __fortify_memcpy_chk(p, q, s, \
| ^~~~~~~~~~~~~~~~~~~~
./include/linux/bitmap.h:259:17: note: in expansion of macro ‘memcpy’
259 | memcpy(dst, src, len);
| ^~~~~~
kernel/padata.c: In function ‘__padata_set_cpumasks’:
kernel/padata.c:713:48: note: source object ‘pcpumask’ of size [0, 256]
713 | cpumask_var_t pcpumask,
| ~~~~~~~~~~~~~~^~~~~~~~
This warning is _not_ emitted when CONFIG_FORTIFY_SOURCE is disabled,
and with the recent -fdiagnostics-details we can confirm the origin of
the warning is due to FORTIFY's bounds checking:
../include/linux/bitmap.h:259:17: note: in expansion of macro 'memcpy'
259 | memcpy(dst, src, len);
| ^~~~~~
'__padata_set_cpumasks': events 1-2
../include/linux/fortify-string.h:613:36:
612 | if (p_size_field != SIZE_MAX &&
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~
613 | p_size != p_size_field && p_size_field < size)
| ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~
| |
| (1) when the condition is evaluated to false
| (2) when the condition is evaluated to true
'__padata_set_cpumasks': event 3
114 | #define __underlying_memcpy __builtin_memcpy
| ^
| |
| (3) out of array bounds here
Note that the cpumask warning started appearing since bitmap functions
were recently marked __always_inline in commit ed8cd2b3bd9f ("bitmap:
Switch from inline to __always_inline"), which allowed GCC to gain
visibility into the variables as they passed through the FORTIFY
implementation.
In order to silence these false positives but keep otherwise deterministic
compile-time warnings intact, hide the length variable from GCC with
OPTIMIZE_HIDE_VAR() before calling the builtin memcpy.
Additionally add a comment about why all the macro args have copies with
const storage.
Steven Rostedt [Mon, 16 Dec 2024 21:46:33 +0000 (16:46 -0500)]
ftrace: Do not find "true_parent" if HAVE_DYNAMIC_FTRACE_WITH_ARGS is not set
When function tracing and function graph tracing are both enabled (in
different instances) the "parent" of some of the function tracing events
is "return_to_handler" which is the trampoline used by function graph
tracing. To fix this, ftrace_get_true_parent_ip() was introduced that
returns the "true" parent ip instead of the trampoline.
To do this, the ftrace_regs_get_stack_pointer() is used, which uses
kernel_stack_pointer(). The problem is that microblaze does not implement
kerenl_stack_pointer() so when function graph tracing is enabled, the
build fails. But microblaze also does not enabled HAVE_DYNAMIC_FTRACE_WITH_ARGS.
That option has to be enabled by the architecture to reliably get the
values from the fregs parameter passed in. When that config is not set,
the architecture can also pass in NULL, which is not tested for in that
function and could cause the kernel to crash.
Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Michal Simek <monstr@monstr.eu> Cc: Jeff Xie <jeff.xie@linux.dev> Link: https://lore.kernel.org/20241216164633.6df18e87@gandalf.local.home Fixes: 60b1f578b578 ("ftrace: Get the true parent ip for function tracer") Reported-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Steven Rostedt [Wed, 11 Dec 2024 18:53:35 +0000 (13:53 -0500)]
fgraph: Still initialize idle shadow stacks when starting
A bug was discovered where the idle shadow stacks were not initialized
for offline CPUs when starting function graph tracer, and when they came
online they were not traced due to the missing shadow stack. To fix
this, the idle task shadow stack initialization was moved to using the
CPU hotplug callbacks. But it removed the initialization when the
function graph was enabled. The problem here is that the hotplug
callbacks are called when the CPUs come online, but the idle shadow
stack initialization only happens if function graph is currently
active. This caused the online CPUs to not get their shadow stack
initialized.
The idle shadow stack initialization still needs to be done when the
function graph is registered, as they will not be allocated if function
graph is not registered.
Cc: stable@vger.kernel.org Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Link: https://lore.kernel.org/20241211135335.094ba282@batman.local.home Fixes: 2c02f7375e65 ("fgraph: Use CPU hotplug mechanism to initialize idle shadow stacks") Reported-by: Linus Walleij <linus.walleij@linaro.org> Tested-by: Linus Walleij <linus.walleij@linaro.org> Closes: https://lore.kernel.org/all/CACRpkdaTBrHwRbbrphVy-=SeDz6MSsXhTKypOtLrTQ+DgGAOcQ@mail.gmail.com/ Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Linus Torvalds [Mon, 16 Dec 2024 18:01:57 +0000 (10:01 -0800)]
Merge tag 'platform-drivers-x86-v6.13-3' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86
Pull x86 platform driver fixes from Ilpo Järvinen:
- alienware-wmi:
- Add support for Alienware m16 R1 AMD
- Do not setup legacy LED control with X and G Series
- intel/ifs: Clearwater Forest support
- intel/vsec: Panther Lake support
- p2sb: Do not hide the device if BIOS left it unhidden
- touchscreen_dmi: Add SARY Tab 3 tablet information
* tag 'platform-drivers-x86-v6.13-3' of git://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86:
platform/x86/intel/vsec: Add support for Panther Lake
platform/x86/intel/ifs: Add Clearwater Forest to CPU support list
platform/x86: touchscreen_dmi: Add info for SARY Tab 3 tablet
p2sb: Do not scan and remove the P2SB device when it is unhidden
p2sb: Move P2SB hide and unhide code to p2sb_scan_and_cache()
p2sb: Introduce the global flag p2sb_hidden_by_bios
p2sb: Factor out p2sb_read_from_cache()
alienware-wmi: Adds support to Alienware m16 R1 AMD
alienware-wmi: Fix X Series and G Series quirks
Gao Xiang [Thu, 12 Dec 2024 13:43:36 +0000 (21:43 +0800)]
erofs: use buffered I/O for file-backed mounts by default
For many use cases (e.g. container images are just fetched from remote),
performance will be impacted if underlay page cache is up-to-date but
direct i/o flushes dirty pages first.
Instead, let's use buffered I/O by default to keep in sync with loop
devices and add a (re)mount option to explicitly give a try to use
direct I/O if supported by the underlying files.
The container startup time is improved as below:
[workload] docker.io/library/workpress:latest
unpack 1st run non-1st runs
EROFS snapshotter buffered I/O file 4.586404265s 0.308s 0.198s
EROFS snapshotter direct I/O file 4.581742849s 2.238s 0.222s
EROFS snapshotter loop 4.596023152s 0.346s 0.201s
Overlayfs snapshotter 5.382851037s 0.206s 0.214s
Namjae Jeon [Sat, 14 Dec 2024 03:19:03 +0000 (12:19 +0900)]
ksmbd: conn lock to serialize smb2 negotiate
If client send parallel smb2 negotiate request on same connection,
ksmbd_conn can be racy. smb2 negotiate handling that are not
performance-related can be serialized with conn lock.
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com>
Marios Makassikis [Sat, 14 Dec 2024 03:17:23 +0000 (12:17 +0900)]
ksmbd: fix broken transfers when exceeding max simultaneous operations
Since commit 0a77d947f599 ("ksmbd: check outstanding simultaneous SMB
operations"), ksmbd enforces a maximum number of simultaneous operations
for a connection. The problem is that reaching the limit causes ksmbd to
close the socket, and the client has no indication that it should have
slowed down.
This behaviour can be reproduced by setting "smb2 max credits = 128" (or
lower), and transferring a large file (25GB).
Windows clients fail with 0x8007003b (with smaller files even).
Fix this by delaying reading from the socket until there's room to
allocate a request. This effectively applies backpressure on the client,
so the transfer completes, albeit at a slower rate.
Fixes: 0a77d947f599 ("ksmbd: check outstanding simultaneous SMB operations") Signed-off-by: Marios Makassikis <mmakassikis@freebox.fr> Signed-off-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com>
Marios Makassikis [Sat, 14 Dec 2024 03:16:45 +0000 (12:16 +0900)]
ksmbd: count all requests in req_running counter
This changes the semantics of req_running to count all in-flight
requests on a given connection, rather than the number of elements
in the conn->request list. The latter is used only in smb2_cancel,
and the counter is not used
Signed-off-by: Marios Makassikis <mmakassikis@freebox.fr> Acked-by: Namjae Jeon <linkinjeon@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com>
Thiébaud Weksteen [Thu, 5 Dec 2024 01:09:19 +0000 (12:09 +1100)]
selinux: ignore unknown extended permissions
When evaluating extended permissions, ignore unknown permissions instead
of calling BUG(). This commit ensures that future permissions can be
added without interfering with older kernels.
Cc: stable@vger.kernel.org Fixes: fa1aa143ac4a ("selinux: extended permissions for ioctls") Signed-off-by: Thiébaud Weksteen <tweek@google.com> Signed-off-by: Paul Moore <paul@paul-moore.com>
Linus Torvalds [Sun, 15 Dec 2024 23:33:41 +0000 (15:33 -0800)]
Merge tag 'efi-fixes-for-v6.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi
Pull EFI fixes from Ard Biesheuvel:
- Limit EFI zboot to GZIP and ZSTD before it comes in wider use
- Fix inconsistent error when looking up a non-existent file in
efivarfs with a name that does not adhere to the NAME-GUID format
- Drop some unused code
* tag 'efi-fixes-for-v6.13-1' of git://git.kernel.org/pub/scm/linux/kernel/git/efi/efi:
efi/esrt: remove esre_attribute::store()
efivarfs: Fix error on non-existent file
efi/zboot: Limit compression options to GZIP and ZSTD
Linus Torvalds [Sun, 15 Dec 2024 23:29:07 +0000 (15:29 -0800)]
Merge tag 'i2c-for-6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux
Pull i2c fixes from Wolfram Sang:
"i2c host fixes: PNX used the wrong unit for timeouts, Nomadik was
missing a sentinel, and RIIC was missing rounding up"
* tag 'i2c-for-6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
i2c: riic: Always round-up when calculating bus period
i2c: nomadik: Add missing sentinel to match table
i2c: pnx: Fix timeout in wait functions
Vasily Gorbik [Tue, 10 Dec 2024 11:35:34 +0000 (12:35 +0100)]
s390/mm: Consider KMSAN modules metadata for paging levels
The calculation determining whether to use three- or four-level paging
didn't account for KMSAN modules metadata. Include this metadata in the
virtual memory size calculation to ensure correct paging mode selection
and avoiding potentially unnecessary physical memory size limitations.
Fixes: 65ca73f9fb36 ("s390/mm: define KMSAN metadata for vmalloc and modules") Acked-by: Heiko Carstens <hca@linux.ibm.com> Reviewed-by: Alexander Gordeev <agordeev@linux.ibm.com> Reviewed-by: Ilya Leoshkevich <iii@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Linus Torvalds [Sun, 15 Dec 2024 18:01:10 +0000 (10:01 -0800)]
Merge tag 'edac_urgent_for_v6.13_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras
Pull EDAC fix from Borislav Petkov:
- Make sure amd64_edac loads successfully on certain Zen4 memory
configurations
* tag 'edac_urgent_for_v6.13_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/ras/ras:
EDAC/amd64: Simplify ECC check on unified memory controllers
Linus Torvalds [Sun, 15 Dec 2024 17:58:27 +0000 (09:58 -0800)]
Merge tag 'irq_urgent_for_v6.13_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull irq fixes from Borislav Petkov:
- Disable the secure programming interface of the GIC500 chip in the
RK3399 SoC to fix interrupt priority assignment and even make a dead
machine boot again when the gic-v3 driver enables pseudo NMIs
- Correct the declaration of a percpu variable to fix several sparse
warnings
* tag 'irq_urgent_for_v6.13_rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
irqchip/gic-v3: Work around insecure GIC integrations
irqchip/gic: Correct declaration of *percpu_base pointer in union gic_base
Linus Torvalds [Sun, 15 Dec 2024 17:38:03 +0000 (09:38 -0800)]
Merge tag 'sched_urgent_for_v6.13_rc3-p2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull scheduler fixes from Borislav Petkov:
- Prevent incorrect dequeueing of the deadline dlserver helper task and
fix its time accounting
- Properly track the CFS runqueue runnable stats
- Check the total number of all queued tasks in a sched fair's runqueue
hierarchy before deciding to stop the tick
- Fix the scheduling of the task that got woken last (NEXT_BUDDY) by
preventing those from being delayed
* tag 'sched_urgent_for_v6.13_rc3-p2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
sched/dlserver: Fix dlserver time accounting
sched/dlserver: Fix dlserver double enqueue
sched/eevdf: More PELT vs DELAYED_DEQUEUE
sched/fair: Fix sched_can_stop_tick() for fair tasks
sched/fair: Fix NEXT_BUDDY
Linus Torvalds [Sun, 15 Dec 2024 17:26:13 +0000 (09:26 -0800)]
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull kvm fixes from Paolo Bonzini:
"ARM64:
- Fix confusion with implicitly-shifted MDCR_EL2 masks breaking
SPE/TRBE initialization
- Align nested page table walker with the intended memory attribute
combining rules of the architecture
- Prevent userspace from constraining the advertised ASID width,
avoiding horrors of guest TLBIs not matching the intended context
in hardware
- Don't leak references on LPIs when insertion into the translation
cache fails
RISC-V:
- Replace csr_write() with csr_set() for HVIEN PMU overflow bit
x86:
- Cache CPUID.0xD XSTATE offsets+sizes during module init
On Intel's Emerald Rapids CPUID costs hundreds of cycles and there
are a lot of leaves under 0xD. Getting rid of the CPUIDs during
nested VM-Enter and VM-Exit is planned for the next release, for
now just cache them: even on Skylake that is 40% faster"
* tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
KVM: x86: Cache CPUID.0xD XSTATE offsets+sizes during module init
RISC-V: KVM: Fix csr_write -> csr_set for HVIEN PMU overflow bit
KVM: arm64: vgic-its: Add error handling in vgic_its_cache_translation
KVM: arm64: Do not allow ID_AA64MMFR0_EL1.ASIDbits to be overridden
KVM: arm64: Fix S1/S2 combination when FWB==1 and S2 has Device memory type
arm64: Fix usage of new shifted MDCR_EL2 values
Linus Torvalds [Sat, 14 Dec 2024 23:53:02 +0000 (15:53 -0800)]
Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi
Pull SCSI fix from James Bottomley:
"Single one-line fix in the ufs driver"
* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
scsi: ufs: core: Update compl_time_stamp_local_clock after completing a cqe
Linus Torvalds [Sat, 14 Dec 2024 20:58:14 +0000 (12:58 -0800)]
Merge tag 'bpf-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf
Pull bpf fixes from Daniel Borkmann:
- Fix a bug in the BPF verifier to track changes to packet data
property for global functions (Eduard Zingerman)
- Fix a theoretical BPF prog_array use-after-free in RCU handling of
__uprobe_perf_func (Jann Horn)
- Fix BPF tracing to have an explicit list of tracepoints and their
arguments which need to be annotated as PTR_MAYBE_NULL (Kumar
Kartikeya Dwivedi)
- Fix a logic bug in the bpf_remove_insns code where a potential error
would have been wrongly propagated (Anton Protopopov)
- Avoid deadlock scenarios caused by nested kprobe and fentry BPF
programs (Priya Bala Govindasamy)
- Fix a bug in BPF verifier which was missing a size check for
BTF-based context access (Kumar Kartikeya Dwivedi)
- Fix a crash found by syzbot through an invalid BPF prog_array access
in perf_event_detach_bpf_prog (Jiri Olsa)
- Fix several BPF sockmap bugs including a race causing a refcount
imbalance upon element replace (Michal Luczaj)
- Fix a use-after-free from mismatching BPF program/attachment RCU
flavors (Jann Horn)
* tag 'bpf-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf: (23 commits)
bpf: Avoid deadlock caused by nested kprobe and fentry bpf programs
selftests/bpf: Add tests for raw_tp NULL args
bpf: Augment raw_tp arguments with PTR_MAYBE_NULL
bpf: Revert "bpf: Mark raw_tp arguments with PTR_MAYBE_NULL"
selftests/bpf: Add test for narrow ctx load for pointer args
bpf: Check size for BTF-based ctx access of pointer members
selftests/bpf: extend changes_pkt_data with cases w/o subprograms
bpf: fix null dereference when computing changes_pkt_data of prog w/o subprogs
bpf: Fix theoretical prog_array UAF in __uprobe_perf_func()
bpf: fix potential error return
selftests/bpf: validate that tail call invalidates packet pointers
bpf: consider that tail calls invalidate packet pointers
selftests/bpf: freplace tests for tracking of changes_packet_data
bpf: check changes_pkt_data property for extension programs
selftests/bpf: test for changing packet data from global functions
bpf: track changes_pkt_data property for global functions
bpf: refactor bpf_helper_changes_pkt_data to use helper number
bpf: add find_containing_subprog() utility function
bpf,perf: Fix invalid prog_array access in perf_event_detach_bpf_prog
bpf: Fix UAF via mismatching bpf_prog/attachment RCU flavors
...
bpf: Avoid deadlock caused by nested kprobe and fentry bpf programs
BPF program types like kprobe and fentry can cause deadlocks in certain
situations. If a function takes a lock and one of these bpf programs is
hooked to some point in the function's critical section, and if the
bpf program tries to call the same function and take the same lock it will
lead to deadlock. These situations have been reported in the following
bug reports.
The bugs reported by syzbot are due to tracepoint bpf programs being
called in the critical sections. This patch does not aim to fix deadlocks
caused by tracepoint programs. However, it does prevent deadlocks from
occurring in similar situations due to kprobe and fentry programs.
Linus Torvalds [Sat, 14 Dec 2024 17:31:19 +0000 (09:31 -0800)]
Merge tag 'tty-6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty
Pull serial driver fixes from Greg KH:
"Here are two small serial driver fixes for 6.13-rc3. They are:
- ioport build fallout fix for the 8250 port driver that should
resolve Guenter's runtime problems
- sh-sci driver bugfix for a reported problem
Both of these have been in linux-next for a while with no reported
issues"
* tag 'tty-6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
tty: serial: Work around warning backtrace in serial8250_set_defaults
serial: sh-sci: Check if TX data was written to device in .tx_empty()
Linus Torvalds [Sat, 14 Dec 2024 17:27:07 +0000 (09:27 -0800)]
Merge tag 'staging-6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
Pull staging driver fixes from Greg KH:
"Here are some small staging gpib driver build and bugfixes for issues
that have been much-reported (should finally fix Guenter's build
issues). There are more of these coming in later -rc releases, but for
now this should fix the majority of the reported problems.
All of these have been in linux-next for a while with no reported
issues"
* tag 'staging-6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging:
staging: gpib: Fix i386 build issue
staging: gpib: Fix faulty workaround for assignment in if
staging: gpib: Workaround for ppc build failure
staging: gpib: Make GPIB_NI_PCI_ISA depend on HAS_IOPORT
Linus Torvalds [Sat, 14 Dec 2024 17:15:49 +0000 (09:15 -0800)]
Merge tag 'v6.13-p2' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
Pull crypto fixes from Herbert Xu:
"Fix a regression in rsassa-pkcs1 as well as a buffer overrun in
hisilicon/debugfs"
* tag 'v6.13-p2' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
crypto: hisilicon/debugfs - fix the struct pointer incorrectly offset problem
crypto: rsassa-pkcs1 - Copy source data for SG list
Linus Torvalds [Sat, 14 Dec 2024 16:51:43 +0000 (08:51 -0800)]
Merge tag 'rust-fixes-6.13' of https://github.com/Rust-for-Linux/linux
Pull rust fixes from Miguel Ojeda:
"Toolchain and infrastructure:
- Set bindgen's Rust target version to prevent issues when
pairing older rustc releases with newer bindgen releases,
such as bindgen >= 0.71.0 and rustc < 1.82 due to
unsafe_extern_blocks.
drm/panic:
- Remove spurious empty line detected by a new Clippy warning"
* tag 'rust-fixes-6.13' of https://github.com/Rust-for-Linux/linux:
rust: kbuild: set `bindgen`'s Rust target version
drm/panic: remove spurious empty line to clean warning
Linus Torvalds [Sat, 14 Dec 2024 16:41:40 +0000 (08:41 -0800)]
Merge tag 'iommu-fixes-v6.13-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/iommu/linux
Pull iommu fixes from Joerg Roedel:
- Per-domain device-list locking fixes for the AMD IOMMU driver
- Fix incorrect use of smp_processor_id() in the NVidia-specific part
of the ARM-SMMU-v3 driver
- Intel IOMMU driver fixes:
- Remove cache tags before disabling ATS
- Avoid draining PRQ in sva mm release path
- Fix qi_batch NULL pointer with nested parent domain
* tag 'iommu-fixes-v6.13-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/iommu/linux:
iommu/vt-d: Avoid draining PRQ in sva mm release path
iommu/vt-d: Fix qi_batch NULL pointer with nested parent domain
iommu/vt-d: Remove cache tags before disabling ATS
iommu/amd: Add lockdep asserts for domain->dev_list
iommu/amd: Put list_add/del(dev_data) back under the domain->lock
iommu/tegra241-cmdqv: do not use smp_processor_id in preemptible context
Linus Torvalds [Sat, 14 Dec 2024 16:40:05 +0000 (08:40 -0800)]
Merge tag 'ata-6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/libata/linux
Pull ata fix from Damien Le Moal:
- Fix an OF node reference leak in the sata_highbank driver
* tag 'ata-6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/libata/linux:
ata: sata_highbank: fix OF node reference leak in highbank_initialize_phys()
Wolfram Sang [Sat, 14 Dec 2024 09:01:46 +0000 (10:01 +0100)]
Merge tag 'i2c-host-fixes-6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/andi.shyti/linux into i2c/for-current
i2c-host-fixes for v6.13-rc3
- Replaced jiffies with msec for timeout calculations.
- Added a sentinel to the 'of_device_id' array in Nomadik.
- Rounded up bus period calculation in RIIC.
Linus Torvalds [Sat, 14 Dec 2024 01:36:02 +0000 (17:36 -0800)]
Merge tag '6.13-rc2-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6
Pull smb client fixes from Steve French:
- fix rmmod leak
- two minor cleanups
- fix for unlink/rename with pending i/o
* tag '6.13-rc2-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
smb: client: destroy cfid_put_wq on module exit
cifs: Use str_yes_no() helper in cifs_ses_add_channel()
cifs: Fix rmdir failure due to ongoing I/O on deleted file
smb3: fix compiler warning in reparse code
Linus Torvalds [Sat, 14 Dec 2024 01:29:19 +0000 (17:29 -0800)]
Merge tag 'spi-fix-v6.13-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi
Pull spi fixes from Mark Brown:
"A few fairly small fixes for v6.13, the most substatial one being
disabling STIG mode for Cadence QSPI controllers on Altera SoCFPGA
platforms since it doesn't work"
* tag 'spi-fix-v6.13-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
spi: spi-cadence-qspi: Disable STIG mode for Altera SoCFPGA.
spi: rockchip: Fix PM runtime count on no-op cs
spi: aspeed: Fix an error handling path in aspeed_spi_[read|write]_user()
Linus Torvalds [Sat, 14 Dec 2024 01:18:28 +0000 (17:18 -0800)]
Merge tag 'regulator-fix-v6.13-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator
Pull regulator fixes from Mark Brown:
"A couple of additional changes, one ensuring we give AXP717 enough
time to stabilise after changing voltages which fixes serious
stability issues on some platforms and another documenting the DT
support required for the Qualcomm WCN6750"
* tag 'regulator-fix-v6.13-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator:
regulator: axp20x: AXP717: set ramp_delay
regulator: dt-bindings: qcom,qca6390-pmu: document wcn6750-pmu
Linus Torvalds [Sat, 14 Dec 2024 00:58:39 +0000 (16:58 -0800)]
Merge tag 'drm-fixes-2024-12-14' of https://gitlab.freedesktop.org/drm/kernel
Pull drm fixes from Dave Airlie:
"This is the weekly fixes pull for drm. Just has i915, xe and amdgpu
changes in it. Nothing too major in here:
i915:
- Don't use indexed register writes needlessly [dsb]
- Stop using non-posted DSB writes for legacy LUT [color]
- Fix NULL pointer dereference in capture_engine
- Fix memory leak by correcting cache object name in error handler
xe:
- Fix a KUNIT test error message (Mirsad Todorovac)
- Fix an invalidation fence PM ref leak (Daniele)
- Fix a register pool UAF (Lucas)
amdgpu:
- ISP hw init fix
- SR-IOV fixes
- Fix contiguous VRAM mapping for UVD on older GPUs
- Fix some regressions due to drm scheduler changes
- Workload profile fixes
- Cleaner shader fix
amdkfd:
- Fix DMA map direction for migration
- Fix a potential null pointer dereference
- Cacheline size fixes
- Runtime PM fix"
* tag 'drm-fixes-2024-12-14' of https://gitlab.freedesktop.org/drm/kernel:
drm/xe/reg_sr: Remove register pool
drm/xe: Call invalidation_fence_fini for PT inval fences in error state
drm/xe: fix the ERR_PTR() returned on failure to allocate tiny pt
drm/amdkfd: pause autosuspend when creating pdd
drm/amdgpu: fix when the cleaner shader is emitted
drm/amdgpu: Fix ISP HW init issue
drm/amdkfd: hard-code MALL cacheline size for gfx11, gfx12
drm/amdkfd: hard-code cacheline size for gfx11
drm/amdkfd: Dereference null return value
drm/i915: Fix memory leak by correcting cache object name in error handler
drm/i915: Fix NULL pointer dereference in capture_engine
drm/i915/color: Stop using non-posted DSB writes for legacy LUT
drm/i915/dsb: Don't use indexed register writes needlessly
drm/amdkfd: Correct the migration DMA map direction
drm/amd/pm: Set SMU v13.0.7 default workload type
drm/amd/pm: Initialize power profile mode
amdgpu/uvd: get ring reference from rq scheduler
drm/amdgpu: fix UVD contiguous CS mapping problem
drm/amdgpu: use sjt mec fw on gfx943 for sriov
Revert "drm/amdgpu: Fix ISP hw init issue"
Linus Torvalds [Sat, 14 Dec 2024 00:55:43 +0000 (16:55 -0800)]
Merge tag 'pm-6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull power management documentation fix from Rafael Wysocki:
"Fix a runtime PM documentation mistake that may mislead someone into
making a coding mistake (Paul Barker)"
* tag 'pm-6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
Documentation: PM: Clarify pm_runtime_resume_and_get() return value
Linus Torvalds [Sat, 14 Dec 2024 00:51:56 +0000 (16:51 -0800)]
Merge tag 'acpi-6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm
Pull ACPI fixes from Rafael Wysocki:
"These fix two coding mistakes, one in the ACPI resources handling code
and one in ACPICA:
- Relocate the addr->info.mem.caching check in acpi_decode_space() to
only execute it if the resource is of the correct type (Ilpo
Järvinen)
- Don't release a context_mutex that was never acquired in
acpi_remove_address_space_handler() (Daniil Tatianin)"
* tag 'acpi-6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
ACPICA: events/evxfregn: don't release the ContextMutex that was never acquired
ACPI: resource: Fix memory resource type union access
This set reverts the raw_tp masking changes introduced in commit cb4158ce8ec8 ("bpf: Mark raw_tp arguments with PTR_MAYBE_NULL") and
replaces it wwith an explicit list of tracepoints and their arguments
which need to be annotated as PTR_MAYBE_NULL. More context on the
fallout caused by the masking fix and subsequent discussions can be
found in [0].
To remedy this, we implement a solution of explicitly defined tracepoint
and define which args need to be marked NULL or scalar (for IS_ERR
case). The commit logs describes the details of this approach in detail.
We will follow up this solution an approach Eduard is working on to
perform automated analysis of NULL-ness of tracepoint arguments. The
current PoC is available here:
- LLVM branch with the analysis:
https://github.com/eddyz87/llvm-project/tree/nullness-for-tracepoint-params
- Python script for merging of analysis results:
https://gist.github.com/eddyz87/e47c164466a60e8d49e6911cff146f47
The idea is to infer a tri-state verdict for each tracepoint parameter:
definitely not null, can be null, unknown (in which case no assumptions
should be made).
Using this information, the verifier in most cases will be able to
precisely determine the state of the tracepoint parameter without any
human effort. At that point, the table maintained manually in this set
can be dropped and replace with this automated analysis tool's result.
This will be kept up to date with each kernel release.
* Address comments from Jiri
* Mark module tracepoints args NULL by default
* Add more sunrpc tracepoints
* Unify scalar or null handling
* Address comments from Alexei
* Use bitmask approach suggested in review
* Unify scalar or null handling
* Drop most tests that rely on CONFIG options
* Drop scripts to generate tests
====================
Add tests to ensure that arguments are correctly marked based on their
specified positions, and whether they get marked correctly as maybe
null. For modules, all tracepoint parameters should be marked
PTR_MAYBE_NULL by default.
Arguments to a raw tracepoint are tagged as trusted, which carries the
semantics that the pointer will be non-NULL. However, in certain cases,
a raw tracepoint argument may end up being NULL. More context about this
issue is available in [0].
Thus, there is a discrepancy between the reality, that raw_tp arguments can
actually be NULL, and the verifier's knowledge, that they are never NULL,
causing explicit NULL check branch to be dead code eliminated.
A previous attempt [1], i.e. the second fixed commit, was made to
simulate symbolic execution as if in most accesses, the argument is a
non-NULL raw_tp, except for conditional jumps. This tried to suppress
branch prediction while preserving compatibility, but surfaced issues
with production programs that were difficult to solve without increasing
verifier complexity. A more complete discussion of issues and fixes is
available at [2].
Fix this by maintaining an explicit list of tracepoints where the
arguments are known to be NULL, and mark the positional arguments as
PTR_MAYBE_NULL. Additionally, capture the tracepoints where arguments
are known to be ERR_PTR, and mark these arguments as scalar values to
prevent potential dereference.
Each hex digit is used to encode NULL-ness (0x1) or ERR_PTR-ness (0x2),
shifted by the zero-indexed argument number x 4. This can be represented
as follows:
1st arg: 0x1
2nd arg: 0x10
3rd arg: 0x100
... and so on (likewise for ERR_PTR case).
In the future, an automated pass will be used to produce such a list, or
insert __nullable annotations automatically for tracepoints. Each
compilation unit will be analyzed and results will be collated to find
whether a tracepoint pointer is definitely not null, maybe null, or an
unknown state where verifier conservatively marks it PTR_MAYBE_NULL.
A proof of concept of this tool from Eduard is available at [3].
Note that in case we don't find a specification in the raw_tp_null_args
array and the tracepoint belongs to a kernel module, we will
conservatively mark the arguments as PTR_MAYBE_NULL. This is because
unlike for in-tree modules, out-of-tree module tracepoints may pass NULL
freely to the tracepoint. We don't protect against such tracepoints
passing ERR_PTR (which is uncommon anyway), lest we mark all such
arguments as SCALAR_VALUE.
While we are it, let's adjust the test raw_tp_null to not perform
dereference of the skb->mark, as that won't be allowed anymore, and make
it more robust by using inline assembly to test the dead code
elimination behavior, which should still stay the same.
Reported-by: Juri Lelli <juri.lelli@redhat.com> # original bug Reported-by: Manu Bretelle <chantra@meta.com> # bugs in masking fix Fixes: 3f00c5239344 ("bpf: Allow trusted pointers to be passed to KF_TRUSTED_ARGS kfuncs") Fixes: cb4158ce8ec8 ("bpf: Mark raw_tp arguments with PTR_MAYBE_NULL") Reviewed-by: Eduard Zingerman <eddyz87@gmail.com> Co-developed-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Jiri Olsa <jolsa@kernel.org> Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com> Link: https://lore.kernel.org/r/20241213221929.3495062-3-memxor@gmail.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
bpf: Revert "bpf: Mark raw_tp arguments with PTR_MAYBE_NULL"
This patch reverts commit cb4158ce8ec8 ("bpf: Mark raw_tp arguments with PTR_MAYBE_NULL"). The
patch was well-intended and meant to be as a stop-gap fixing branch
prediction when the pointer may actually be NULL at runtime. Eventually,
it was supposed to be replaced by an automated script or compiler pass
detecting possibly NULL arguments and marking them accordingly.
However, it caused two main issues observed for production programs and
failed to preserve backwards compatibility. First, programs relied on
the verifier not exploring == NULL branch when pointer is not NULL, thus
they started failing with a 'dereference of scalar' error. Next,
allowing raw_tp arguments to be modified surfaced the warning in the
verifier that warns against reg->off when PTR_MAYBE_NULL is set.
More information, context, and discusson on both problems is available
in [0]. Overall, this approach had several shortcomings, and the fixes
would further complicate the verifier's logic, and the entire masking
scheme would have to be removed eventually anyway.
Hence, revert the patch in preparation of a better fix avoiding these
issues to replace this commit.
Linus Torvalds [Fri, 13 Dec 2024 23:10:59 +0000 (15:10 -0800)]
Merge tag 'block-6.13-20241213' of git://git.kernel.dk/linux
Pull block fixes from Jens Axboe:
- Series from Damien fixing issues with the zoned write plugging
- Fix for a potential UAF in block cgroups
- Fix deadlock around queue freezing and the sysfs lock
- Various little cleanups and fixes
* tag 'block-6.13-20241213' of git://git.kernel.dk/linux:
block: Fix potential deadlock while freezing queue and acquiring sysfs_lock
block: Fix queue_iostats_passthrough_show()
blk-mq: Clean up blk_mq_requeue_work()
mq-deadline: Remove a local variable
blk-iocost: Avoid using clamp() on inuse in __propagate_weights()
block: Make bio_iov_bvec_set() accept pointer to const iov_iter
block: get wp_offset by bdev_offset_from_zone_start
blk-cgroup: Fix UAF in blkcg_unpin_online()
MAINTAINERS: update Coly Li's email address
block: Prevent potential deadlocks in zone write plug error recovery
dm: Fix dm-zoned-reclaim zone write pointer alignment
block: Ignore REQ_NOWAIT for zone reset and zone finish operations
block: Use a zone write plug BIO work for REQ_NOWAIT BIOs
Linus Torvalds [Fri, 13 Dec 2024 23:07:22 +0000 (15:07 -0800)]
Merge tag 'libnvdimm-fixes-6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm
Pull libnvdimm fix from Ira Weiny:
- sysbot fix for out of bounds access
* tag 'libnvdimm-fixes-6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm:
acpi: nfit: vmalloc-out-of-bounds Read in acpi_nfit_ctl
Leon Romanovsky [Tue, 3 Dec 2024 12:37:15 +0000 (14:37 +0200)]
ARC: build: Try to guess GCC variant of cross compiler
ARC GCC compiler is packaged starting from Fedora 39i and the GCC
variant of cross compile tools has arc-linux-gnu- prefix and not
arc-linux-. This is causing that CROSS_COMPILE variable is left unset.
This change allows builds without need to supply CROSS_COMPILE argument
if distro package is used.
Before this change:
$ make -j 128 ARCH=arc W=1 drivers/infiniband/hw/mlx4/
gcc: warning: ‘-mcpu=’ is deprecated; use ‘-mtune=’ or ‘-march=’ instead
gcc: error: unrecognized command-line option ‘-mmedium-calls’
gcc: error: unrecognized command-line option ‘-mlock’
gcc: error: unrecognized command-line option ‘-munaligned-access’
[1] https://packages.fedoraproject.org/pkgs/cross-gcc/gcc-arc-linux-gnu/index.html Signed-off-by: Leon Romanovsky <leonro@nvidia.com> Signed-off-by: Vineet Gupta <vgupta@kernel.org>
Linus Torvalds [Fri, 13 Dec 2024 22:27:40 +0000 (14:27 -0800)]
Merge tag 'xfs-fixes-6.13-rc3' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux
Pull xfs fixes from Carlos Maiolino:
- Fixes for scrub subsystem
- Fix quota crashes
- Fix sb_spino_align checons on large fsblock sizes
- Fix discarded superblock updates
- Fix stuck unmount due to a locked inode
* tag 'xfs-fixes-6.13-rc3' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux: (28 commits)
xfs: port xfs_ioc_start_commit to multigrain timestamps
xfs: return from xfs_symlink_verify early on V4 filesystems
xfs: fix zero byte checking in the superblock scrubber
xfs: check pre-metadir fields correctly
xfs: don't crash on corrupt /quotas dirent
xfs: don't move nondir/nonreg temporary repair files to the metadir namespace
xfs: fix sb_spino_align checks for large fsblock sizes
xfs: convert quotacheck to attach dquot buffers
xfs: attach dquot buffer to dquot log item buffer
xfs: clean up log item accesses in xfs_qm_dqflush{,_done}
xfs: separate dquot buffer reads from xfs_dqflush
xfs: don't lose solo dquot update transactions
xfs: don't lose solo superblock counter update transactions
xfs: avoid nested calls to __xfs_trans_commit
xfs: only run precommits once per transaction object
xfs: unlock inodes when erroring out of xfs_trans_alloc_dir
xfs: fix scrub tracepoints when inode-rooted btrees are involved
xfs: update btree keys correctly when _insrec splits an inode root block
xfs: fix error bailout in xfs_rtginode_create
xfs: fix null bno_hint handling in xfs_rtallocate_rtg
...
Linus Torvalds [Fri, 13 Dec 2024 22:23:09 +0000 (14:23 -0800)]
Merge tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux
Pull arm64 fixes from Catalin Marinas:
- arm64 stacktrace: address some fallout from the recent changes to
unwinding across exception boundaries
- Ensure the arm64 signal delivery failure is recoverable - only
override the return registers after all the user accesses took place
- Fix the arm64 kselftest access to SVCR - only when SME is detected
* tag 'arm64-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux:
kselftest/arm64: abi: fix SVCR detection
arm64: signal: Ensure signal delivery failure is recoverable
arm64: stacktrace: Don't WARN when unwinding other tasks
arm64: stacktrace: Skip reporting LR at exception boundaries
Linus Torvalds [Fri, 13 Dec 2024 22:18:18 +0000 (14:18 -0800)]
Merge tag 'riscv-for-linus-6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux
Pull RISC-V fixes from Palmer Dabbelt:
- avoid taking a mutex while resolving jump_labels in the mutex
implementation
- avoid trying to resolve the early boot DT pointer via the linear map
- avoid trying to IPI kfence TLB flushes, as kfence might flush with
IRQs disabled
- avoid calling PMD destructors on PMDs that were never constructed
* tag 'riscv-for-linus-6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux:
riscv: mm: Do not call pmd dtor on vmemmap page table teardown
riscv: Fix IPIs usage in kfence_protect_page()
riscv: Fix wrong usage of __pa() on a fixmap address
riscv: Fixup boot failure when CONFIG_DEBUG_RT_MUTEXES=y
Sean Christopherson [Wed, 11 Dec 2024 01:32:58 +0000 (17:32 -0800)]
KVM: x86: Cache CPUID.0xD XSTATE offsets+sizes during module init
Snapshot the output of CPUID.0xD.[1..n] during kvm.ko initiliaization to
avoid the overead of CPUID during runtime. The offset, size, and metadata
for CPUID.0xD.[1..n] sub-leaves does not depend on XCR0 or XSS values, i.e.
is constant for a given CPU, and thus can be cached during module load.
On Intel's Emerald Rapids, CPUID is *wildly* expensive, to the point where
recomputing XSAVE offsets and sizes results in a 4x increase in latency of
nested VM-Enter and VM-Exit (nested transitions can trigger
xstate_required_size() multiple times per transition), relative to using
cached values. The issue is easily visible by running `perf top` while
triggering nested transitions: kvm_update_cpuid_runtime() shows up at a
whopping 50%.
As measured via RDTSC from L2 (using KVM-Unit-Test's CPUID VM-Exit test
and a slightly modified L1 KVM to handle CPUID in the fastpath), a nested
roundtrip to emulate CPUID on Skylake (SKX), Icelake (ICX), and Emerald
Rapids (EMR) takes:
SKX 11650
ICX 22350
EMR 28850
Using cached values, the latency drops to:
SKX 6850
ICX 9000
EMR 7900
The underlying issue is that CPUID itself is slow on ICX, and comically
slow on EMR. The problem is exacerbated on CPUs which support XSAVES
and/or XSAVEC, as KVM invokes xstate_required_size() twice on each
runtime CPUID update, and because there are more supported XSAVE features
(CPUID for supported XSAVE feature sub-leafs is significantly slower).
Note, updating runtime CPUID information multiple times per nested
transition is itself a flaw, especially since CPUID is a mandotory
intercept on both Intel and AMD. E.g. KVM doesn't need to ensure emulated
CPUID state is up-to-date while running L2. That flaw will be fixed in a
future patch, as deferring runtime CPUID updates is more subtle than it
appears at first glance, the benefits aren't super critical to have once
the XSAVE issue is resolved, and caching CPUID output is desirable even if
KVM's updates are deferred.
Cc: Jim Mattson <jmattson@google.com> Cc: stable@vger.kernel.org Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-ID: <20241211013302.1347853-2-seanjc@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Linus Torvalds [Fri, 13 Dec 2024 17:57:15 +0000 (09:57 -0800)]
Merge tag 'gpio-fixes-for-v6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux
Pull gpio fixes from Bartosz Golaszewski:
- fix several low-level issues in gpio-graniterapids
- fix an initialization order issue that manifests itself with
__counted_by() checks in gpio-ljca
- don't default to y for CONFIG_GPIO_MVEBU with COMPILE_TEST enabled
- move the DEFAULT_SYMBOL_NAMESPACE define before the export.h include
in gpio-idio-16
* tag 'gpio-fixes-for-v6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux:
gpio: idio-16: Actually make use of the GPIO_IDIO_16 symbol namespace
gpio: graniterapids: Fix GPIO Ack functionality
gpio: graniterapids: Check if GPIO line can be used for IRQs
gpio: graniterapids: Determine if GPIO pad can be used by driver
gpio: graniterapids: Fix invalid RXEVCFG register bitmask
gpio: graniterapids: Fix invalid GPI_IS register offset
gpio: graniterapids: Fix incorrect BAR assignment
gpio: graniterapids: Fix vGPIO driver crash
gpio: ljca: Initialize num before accessing item in ljca_gpio_config
gpio: GPIO_MVEBU should not default to y when compile-testing
Nilay Shroff [Tue, 10 Dec 2024 14:41:43 +0000 (20:11 +0530)]
block: Fix potential deadlock while freezing queue and acquiring sysfs_lock
For storing a value to a queue attribute, the queue_attr_store function
first freezes the queue (->q_usage_counter(io)) and then acquire
->sysfs_lock. This seems not correct as the usual ordering should be to
acquire ->sysfs_lock before freezing the queue. This incorrect ordering
causes the following lockdep splat which we are able to reproduce always
simply by accessing /sys/kernel/debug file using ls command:
[ 57.597146] WARNING: possible circular locking dependency detected
[ 57.597154] 6.12.0-10553-gb86545e02e8c #20 Tainted: G W
[ 57.597162] ------------------------------------------------------
[ 57.597168] ls/4605 is trying to acquire lock:
[ 57.597176] c00000003eb56710 (&mm->mmap_lock){++++}-{4:4}, at: __might_fault+0x58/0xc0
[ 57.597200]
but task is already holding lock:
[ 57.597207] c0000018e27c6810 (&sb->s_type->i_mutex_key#3){++++}-{4:4}, at: iterate_dir+0x94/0x1d4
[ 57.597226]
which lock already depends on the new lock.
Prevent the above lockdep warning by acquiring ->sysfs_lock before
freezing the queue while storing a queue attribute in queue_attr_store
function. Later, we also found[1] another function __blk_mq_update_nr_
hw_queues where we first freeze queue and then acquire the ->sysfs_lock.
So we've also updated lock ordering in __blk_mq_update_nr_hw_queues
function and ensured that in all code paths we follow the correct lock
ordering i.e. acquire ->sysfs_lock before freezing the queue.
Linus Torvalds [Fri, 13 Dec 2024 17:51:40 +0000 (09:51 -0800)]
Merge tag 'sound-6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
Pull sound fixes from Takashi Iwai:
"A collection of fixes; all look small, device-specific and boring"
* tag 'sound-6.13-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound:
ASoC: Intel: sof_sdw: Add space for a terminator into DAIs array
ASoC: fsl_spdif: change IFACE_PCM to IFACE_MIXER
ASoC: fsl_xcvr: change IFACE_PCM to IFACE_MIXER
ASoC: tas2781: Fix calibration issue in stress test
ASoC: audio-graph-card: Call of_node_put() on correct node
ASoC: amd: yc: Fix the wrong return value
ALSA: control: Avoid WARN() for symlink errors
sound: usb: format: don't warn that raw DSD is unsupported
sound: usb: enable DSD output for ddHiFi TC44C
ALSA: hda/realtek: Add new alc2xx-fixup-headset-mic model
ALSA: hda/ca0132: Use standard HD-audio quirk matching helpers
ALSA: usb-audio: Add implicit feedback quirk for Yamaha THR5
ALSA: hda/realtek - Add support for ASUS Zen AIO 27 Z272SD_A272SD audio
ALSA: hda/realtek: Fix headset mic on Acer Nitro 5
ALSA: hda: cs35l56: Remove calls to cs35l56_force_sync_asp1_registers_from_cache()
Marc Zyngier [Fri, 13 Dec 2024 14:10:37 +0000 (14:10 +0000)]
irqchip/gic-v3: Work around insecure GIC integrations
It appears that the relatively popular RK3399 SoC has been put together
using a large amount of illicit substances, as experiments reveal that its
integration of GIC500 exposes the *secure* programming interface to
non-secure.
This has some pretty bad effects on the way priorities are handled, and
results in a dead machine if booting with pseudo-NMI enabled
(irqchip.gicv3_pseudo_nmi=1) if the kernel contains 18fdb6348c480 ("arm64:
irqchip/gic-v3: Select priorities at boot time"), which relies on the
priorities being programmed using the NS view.
Let's restore some sanity by going one step further and disable security
altogether in this case. This is not any worse, and puts us in a mode where
priorities actually make some sense.
Huge thanks to Mark Kettenis who initially identified this issue on
OpenBSD, and to Chen-Yu Tsai who reported the problem in Linux.
Fixes: 18fdb6348c480 ("arm64: irqchip/gic-v3: Select priorities at boot time") Reported-by: Mark Kettenis <mark.kettenis@xs4all.nl> Reported-by: Chen-Yu Tsai <wens@csie.org> Signed-off-by: Marc Zyngier <maz@kernel.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Tested-by: Chen-Yu Tsai <wens@csie.org> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/all/20241213141037.3995049-1-maz@kernel.org
Bart Van Assche [Thu, 12 Dec 2024 21:29:41 +0000 (13:29 -0800)]
block: Fix queue_iostats_passthrough_show()
Make queue_iostats_passthrough_show() report 0/1 in sysfs instead of 0/4.
This patch fixes the following sparse warning:
block/blk-sysfs.c:266:31: warning: incorrect type in argument 1 (different base types)
block/blk-sysfs.c:266:31: expected unsigned long var
block/blk-sysfs.c:266:31: got restricted blk_flags_t
Cc: Keith Busch <kbusch@kernel.org> Cc: Christoph Hellwig <hch@lst.de> Fixes: 110234da18ab ("block: enable passthrough command statistics") Signed-off-by: Bart Van Assche <bvanassche@acm.org> Link: https://lore.kernel.org/r/20241212212941.1268662-4-bvanassche@acm.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
Bart Van Assche [Thu, 12 Dec 2024 21:29:40 +0000 (13:29 -0800)]
blk-mq: Clean up blk_mq_requeue_work()
Move a statement that occurs in both branches of an if-statement in front
of the if-statement. Fix a typo in a source code comment. No functionality
has been changed.
Reviewed-by: Damien Le Moal <dlemoal@kernel.org> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Nitesh Shetty <nj.shetty@samsung.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Link: https://lore.kernel.org/r/20241212212941.1268662-3-bvanassche@acm.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
Bart Van Assche [Thu, 12 Dec 2024 21:29:39 +0000 (13:29 -0800)]
mq-deadline: Remove a local variable
Since commit fde02699c242 ("block: mq-deadline: Remove support for zone
write locking"), the local variable 'insert_before' is assigned once and
is used once. Hence remove this local variable.
Reviewed-by: Damien Le Moal <dlemoal@kernel.org> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Nitesh Shetty <nj.shetty@samsung.com> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Link: https://lore.kernel.org/r/20241212212941.1268662-2-bvanassche@acm.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
Weizhao Ouyang [Wed, 11 Dec 2024 11:16:39 +0000 (19:16 +0800)]
kselftest/arm64: abi: fix SVCR detection
When using svcr_in to check ZA and Streaming Mode, we should make sure
that the value in x2 is correct, otherwise it may trigger an Illegal
instruction if FEAT_SVE and !FEAT_SME.
Fixes: 43e3f85523e4 ("kselftest/arm64: Add SME support to syscall ABI test") Signed-off-by: Weizhao Ouyang <o451686892@gmail.com> Reviewed-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20241211111639.12344-1-o451686892@gmail.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Lu Baolu [Fri, 13 Dec 2024 01:17:52 +0000 (09:17 +0800)]
iommu/vt-d: Avoid draining PRQ in sva mm release path
When a PASID is used for SVA by a device, it's possible that the PASID
entry is cleared before the device flushes all ongoing DMA requests and
removes the SVA domain. This can occur when an exception happens and the
process terminates before the device driver stops DMA and calls the
iommu driver to unbind the PASID.
There's no need to drain the PRQ in the mm release path. Instead, the PRQ
will be drained in the SVA unbind path.
Unfortunately, commit c43e1ccdebf2 ("iommu/vt-d: Drain PRQs when domain
removed from RID") changed this behavior by unconditionally draining the
PRQ in intel_pasid_tear_down_entry(). This can lead to a potential
sleeping-in-atomic-context issue.
Smatch static checker warning:
drivers/iommu/intel/prq.c:95 intel_iommu_drain_pasid_prq()
warn: sleeping in atomic context
To avoid this issue, prevent draining the PRQ in the SVA mm release path
and restore the previous behavior.
Fixes: c43e1ccdebf2 ("iommu/vt-d: Drain PRQs when domain removed from RID") Reported-by: Dan Carpenter <dan.carpenter@linaro.org> Closes: https://lore.kernel.org/linux-iommu/c5187676-2fa2-4e29-94e0-4a279dc88b49@stanley.mountain/ Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Link: https://lore.kernel.org/r/20241212021529.1104745-1-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
Yi Liu [Fri, 13 Dec 2024 01:17:51 +0000 (09:17 +0800)]
iommu/vt-d: Fix qi_batch NULL pointer with nested parent domain
The qi_batch is allocated when assigning cache tag for a domain. While
for nested parent domain, it is missed. Hence, when trying to map pages
to the nested parent, NULL dereference occurred. Also, there is potential
memleak since there is no lock around domain->qi_batch allocation.
To solve it, add a helper for qi_batch allocation, and call it in both
the __cache_tag_assign_domain() and __cache_tag_assign_parent_domain().
Lu Baolu [Fri, 13 Dec 2024 01:17:50 +0000 (09:17 +0800)]
iommu/vt-d: Remove cache tags before disabling ATS
The current implementation removes cache tags after disabling ATS,
leading to potential memory leaks and kernel crashes. Specifically,
CACHE_TAG_DEVTLB type cache tags may still remain in the list even
after the domain is freed, causing a use-after-free condition.
This issue really shows up when multiple VFs from different PFs
passed through to a single user-space process via vfio-pci. In such
cases, the kernel may crash with kernel messages like:
Kevin Brodsky [Tue, 10 Dec 2024 16:09:40 +0000 (16:09 +0000)]
arm64: signal: Ensure signal delivery failure is recoverable
Commit eaf62ce1563b ("arm64/signal: Set up and restore the GCS
context for signal handlers") introduced a potential failure point
at the end of setup_return(). This is unfortunate as it is too late
to deliver a SIGSEGV: if that SIGSEGV is handled, the subsequent
sigreturn will end up returning to the original handler, which is
not the intention (since we failed to deliver that signal).
Make sure this does not happen by calling gcs_signal_entry()
at the very beginning of setup_return(), and add a comment just
after to discourage error cases being introduced from that point
onwards.
While at it, also take care of copy_siginfo_to_user(): since it may
fail, we shouldn't be calling it after setup_return() either. Call
it before setup_return() instead, and move the setting of X1/X2
inside setup_return() where it belongs (after the "point of no
failure").
Background: the first part of setup_rt_frame(), including
setup_sigframe(), has no impact on the execution of the interrupted
thread. The signal frame is written to the stack, but the stack
pointer remains unchanged. Failure at this stage can be recovered by
a SIGSEGV handler, and sigreturn will restore the original context,
at the point where the original signal occurred. On the other hand,
once setup_return() has updated registers including SP, the thread's
control flow has been modified and we must deliver the original
signal.
Fixes: eaf62ce1563b ("arm64/signal: Set up and restore the GCS context for signal handlers") Signed-off-by: Kevin Brodsky <kevin.brodsky@arm.com> Reviewed-by: Dave Martin <Dave.Martin@arm.com> Reviewed-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/r/20241210160940.2031997-1-kevin.brodsky@arm.com Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Arnd Bergmann [Fri, 13 Dec 2024 13:26:22 +0000 (14:26 +0100)]
Merge tag 'ffa-fix-6.13' of https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux into arm/fixes
Arm FF-A fix for v6.13
A single fix to address a possible race around setting ffa_dev->properties
in ffa_device_register() by updating ffa_device_register() to take all
the partition information received from the firmware and updating the
struct ffa_device accordingly before registering the device to the
bus/driver model in the kernel.
* tag 'ffa-fix-6.13' of https://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux:
firmware: arm_ffa: Fix the race around setting ffa_dev->properties
dlserver time is accounted when:
- dlserver is active and the dlserver proxies the cfs task.
- dlserver is active but deferred and cfs task runs after being picked
through the normal fair class pick.
dl_server_update is called in two places to make sure that both the
above times are accounted for. But it doesn't check if dlserver is
active or not. Now that we have this dl_server_active flag, we can
consolidate dl_server_update into one place and all we need to check is
whether dlserver is active or not. When dlserver is active there is only
two possible conditions:
- dlserver is deferred.
- cfs task is running on behalf of dlserver.
dlserver can get dequeued during a dlserver pick_task due to the delayed
deueue feature and this can lead to issues with dlserver logic as it
still thinks that dlserver is on the runqueue. The dlserver throttling
and replenish logic gets confused and can lead to double enqueue of
dlserver.
Double enqueue of dlserver could happend due to couple of reasons:
Case 1
------
Delayed dequeue feature[1] can cause dlserver being stopped during a
pick initiated by dlserver:
__pick_next_task
pick_task_dl -> server_pick_task
pick_task_fair
pick_next_entity (if (sched_delayed))
dequeue_entities
dl_server_stop
server_pick_task goes ahead with update_curr_dl_se without knowing that
dlserver is dequeued and this confuses the logic and may lead to
unintended enqueue while the server is stopped.
Case 2
------
A race condition between a task dequeue on one cpu and same task's enqueue
on this cpu by a remote cpu while the lock is released causing dlserver
double enqueue.
One cpu would be in the schedule() and releasing RQ-lock:
at which point another CPU can take our RQ-lock and do:
try_to_wake_up()
ttwu_queue()
rq_lock()
...
activate_task()
dl_server_start() --> first enqueue
wakeup_preempt() := check_preempt_wakeup_fair()
update_curr()
update_curr_task()
if (current->dl_server)
dl_server_update()
enqueue_dl_entity() --> second enqueue
This bug was not apparent as the enqueue in dl_server_start doesn't
usually happen because of the defer logic. But as a side effect of the
first case(dequeue during dlserver pick), dl_throttled and dl_yield will
be set and this causes the time accounting of dlserver to messup and
then leading to a enqueue in dl_server_start.
Have an explicit flag representing the status of dlserver to avoid the
confusion. This is set in dl_server_start and reset in dlserver_stop.
Fixes: 63ba8422f876 ("sched/deadline: Introduce deadline servers") Suggested-by: Peter Zijlstra <peterz@infradead.org> Signed-off-by: "Vineeth Pillai (Google)" <vineeth@bitbyteword.org> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Marcel Ziswiler <marcel.ziswiler@codethink.co.uk> # ROCK 5B Link: https://lkml.kernel.org/r/20241213032244.877029-1-vineeth@bitbyteword.org
Juergen Gross [Fri, 29 Nov 2024 14:47:49 +0000 (15:47 +0100)]
objtool/x86: allow syscall instruction
The syscall instruction is used in Xen PV mode for doing hypercalls.
Allow syscall to be used in the kernel in case it is tagged with an
unwind hint for objtool.
This is part of XSA-466 / CVE-2024-53241.
Reported-by: Andrew Cooper <andrew.cooper3@citrix.com> Signed-off-by: Juergen Gross <jgross@suse.com> Co-developed-by: Peter Zijlstra <peterz@infradead.org>
Juergen Gross [Thu, 17 Oct 2024 06:29:48 +0000 (08:29 +0200)]
x86: make get_cpu_vendor() accessible from Xen code
In order to be able to differentiate between AMD and Intel based
systems for very early hypercalls without having to rely on the Xen
hypercall page, make get_cpu_vendor() non-static.
Refactor early_cpu_init() for the same reason by splitting out the
loop initializing cpu_devs() into an externally callable function.
This is part of XSA-466 / CVE-2024-53241.
Reported-by: Andrew Cooper <andrew.cooper3@citrix.com> Signed-off-by: Juergen Gross <jgross@suse.com>
projects / users / dwmw2 / linux.git / log