kernel/sysctl.c: add cap_last_cap to /proc/sys/kernel

Userspace needs to know the highest valid capability of the running
kernel, which right now cannot reliably be retrieved from the header files
only.  The fact that this value cannot be determined properly right now
creates various problems for libraries compiled on newer header files
which are run on older kernels.  They assume capabilities are available
which actually aren't.  libcap-ng is one example.  And we ran into the
same problem with systemd too.

Now the capability is exported in /proc/sys/kernel/cap_last_cap.

[akpm@linux-foundation.org: make cap_last_cap const, per Ulrich]
Signed-off-by: Dan Ballard <dan@mindstab.net>
Cc: Randy Dunlap <rdunlap@xenotime.net>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Lennart Poettering <lennart@poettering.net>
Cc: Kay Sievers <kay.sievers@vrfy.org>
Cc: Ulrich Drepper <drepper@akkadia.org>
Cc: James Morris <jmorris@namei.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt
index 704e474a93df8539e093aa3569bb889faa1adb70..1f2463671a1a4d59d0981f0b877c2a1246da82db 100644 (file)
--- a/Documentation/sysctl/kernel.txt
+++ b/Documentation/sysctl/kernel.txt
@@ -24,6 +24,7 @@ show up in /proc/sys/kernel:
 - bootloader_type           [ X86 only ]
 - bootloader_version        [ X86 only ]
 - callhome                  [ S390 only ]
+- cap_last_cap
 - core_pattern
 - core_pipe_limit
 - core_uses_pid
@@ -155,6 +156,13 @@ on has a service contract with IBM.
 
 ==============================================================
 
+cap_last_cap
+
+Highest valid capability of the running kernel.  Exports
+CAP_LAST_CAP from the kernel.
+
+==============================================================
+
 core_pattern:
 
 core_pattern is used to specify a core dumpfile pattern name.

diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 2d2ecdcc8cdbb070999d46ae79b158dbbb28c8a3..c49d66658ec0c97eae795ab70c65188100233aaf 100644 (file)
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -57,6 +57,7 @@
 #include <linux/pipe_fs_i.h>
 #include <linux/oom.h>
 #include <linux/kmod.h>
+#include <linux/capability.h>
 
 #include <asm/uaccess.h>
 #include <asm/processor.h>
@@ -134,6 +135,7 @@ static int minolduid;
 static int min_percpu_pagelist_fract = 8;
 
 static int ngroups_max = NGROUPS_MAX;
+static const int cap_last_cap = CAP_LAST_CAP;
 
 #ifdef CONFIG_INOTIFY_USER
 #include <linux/inotify.h>
@@ -740,6 +742,13 @@ static struct ctl_table kern_table[] = {
                .mode           = 0444,
                .proc_handler   = proc_dointvec,
        },
+       {
+               .procname       = "cap_last_cap",
+               .data           = (void *)&cap_last_cap,
+               .maxlen         = sizeof(int),
+               .mode           = 0444,
+               .proc_handler   = proc_dointvec,
+       },
 #if defined(CONFIG_LOCKUP_DETECTOR)
        {
                .procname       = "watchdog",