]> www.infradead.org Git - users/jedix/linux-maple.git/commit
sparc: Fix system call tracing register handling.
authorMike Frysinger <vapier@gentoo.org>
Mon, 18 Jan 2016 11:32:30 +0000 (06:32 -0500)
committerDhaval Giani <dhaval.giani@oracle.com>
Fri, 20 Jan 2017 22:22:04 +0000 (17:22 -0500)
commit9399b48890d94eea3d6b390eea1017d70efe3d05
tree7638480c772bad05b443e05ac93dd8e21e2f5332
parent923609b109211d60bc4db614f6efa22ee08764bb
sparc: Fix system call tracing register handling.

Orabug: 25308091

[ Upstream commit 1a40b95374f680625318ab61d81958e949e0afe3 ]

A system call trace trigger on entry allows the tracing
process to inspect and potentially change the traced
process's registers.

Account for that by reloading the %g1 (syscall number)
and %i0-%i5 (syscall argument) values.  We need to be
careful to revalidate the range of %g1, and reload the
system call table entry it corresponds to into %l7.

Reported-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Tested-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
(cherry picked from commit d2e4e89ae871295c539334f50368bb48f74c3caf)
Signed-off-by: Dhaval Giani <dhaval.giani@oracle.com>
arch/sparc/kernel/entry.S
arch/sparc/kernel/syscalls.S