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| author | Andy Lutomirski <luto@kernel.org> | 2016-03-09 19:00:33 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2016-03-10 09:48:14 +0100 |
| commit | 2a41aa4feb25af3ead60b740c43df80c576efea2 (patch) | |
| tree | f982f3b4787e2e31cce97673ce733f9a4b0f1574 /arch/x86/include/asm/thread_info.h | |
| parent | 7536656f08d0c1a3b4c487d00785c5186ec6f533 (diff) | |
| download | linux-0-day-2a41aa4feb25af3ead60b740c43df80c576efea2.tar.gz linux-0-day-2a41aa4feb25af3ead60b740c43df80c576efea2.tar.xz | |
x86/entry/32: Add and check a stack canary for the SYSENTER stack
The first instruction of the SYSENTER entry runs on its own tiny
stack. That stack can be used if a #DB or NMI is delivered before
the SYSENTER prologue switches to a real stack.
We have code in place to prevent us from overflowing the tiny stack.
For added paranoia, add a canary to the stack and check it in
do_debug() -- that way, if something goes wrong with the #DB logic,
we'll eventually notice.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/6ff9a806f39098b166dc2c41c1db744df5272f29.1457578375.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/thread_info.h')
0 files changed, 0 insertions, 0 deletions