diff options
| author | Dan Williams <dan.j.williams@intel.com> | 2018-02-05 17:18:17 -0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-02-22 15:43:53 +0100 |
| commit | 7b559f7f08a835ff0e720afb67c18db3e1bf1b86 (patch) | |
| tree | a305f2984bb0e3194542a5774be7f7f769842e2c /include/linux/compiler-gcc.h | |
| parent | c1a5f89b138321e3645af2603efaef1197125660 (diff) | |
x86/entry/64/compat: Clear registers for compat syscalls, to reduce speculation attack surface
commit 6b8cf5cc9965673951f1ab3f0e3cf23d06e3e2ee upstream.
At entry userspace may have populated registers with values that could
otherwise be useful in a speculative execution attack. Clear them to
minimize the kernel's attack surface.
Originally-From: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Cc: <stable@vger.kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
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: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/151787989697.7847.4083702787288600552.stgit@dwillia2-desk3.amr.corp.intel.com
[ Made small improvements to the changelog. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/compiler-gcc.h')
0 files changed, 0 insertions, 0 deletions