Commit-ID: f11988d59f8e1e6f0941e94bd634911f648622ca Gitweb: http://git.kernel.org/tip/f11988d59f8e1e6f0941e94bd634911f648622ca Author: Tom Lendacky <[email protected]> AuthorDate: Mon, 17 Jul 2017 16:10:34 -0500 Committer: Ingo Molnar <[email protected]> CommitDate: Tue, 18 Jul 2017 11:38:06 +0200
compiler-gcc.h: Introduce __nostackprotector function attribute Create a new function attribute, __nostackprotector, that can used to turn off stack protection on a per function basis. ( This is needed by the SME in-place kernel memory encryption feature, which activates encryption and thus changes the value of the stack protection cookie on function return. ) Signed-off-by: Tom Lendacky <[email protected]> Reviewed-by: Thomas Gleixner <[email protected]> Cc: Alexander Potapenko <[email protected]> Cc: Andrey Ryabinin <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Arnd Bergmann <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Brijesh Singh <[email protected]> Cc: Dave Young <[email protected]> Cc: Dmitry Vyukov <[email protected]> Cc: Jonathan Corbet <[email protected]> Cc: Konrad Rzeszutek Wilk <[email protected]> Cc: Larry Woodman <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Matt Fleming <[email protected]> Cc: Michael S. Tsirkin <[email protected]> Cc: Paolo Bonzini <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Radim Krčmář <[email protected]> Cc: Rik van Riel <[email protected]> Cc: Toshimitsu Kani <[email protected]> Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/0576fd5c74440ad0250f16ac6609ecf587812456.1500319216.git.thomas.lenda...@amd.com Signed-off-by: Ingo Molnar <[email protected]> --- include/linux/compiler-gcc.h | 2 ++ include/linux/compiler.h | 4 ++++ 2 files changed, 6 insertions(+) diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h index cd4bbe8..c28cedd 100644 --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h @@ -166,6 +166,8 @@ #if GCC_VERSION >= 40100 # define __compiletime_object_size(obj) __builtin_object_size(obj, 0) + +#define __nostackprotector __attribute__((__optimize__("no-stack-protector"))) #endif #if GCC_VERSION >= 40300 diff --git a/include/linux/compiler.h b/include/linux/compiler.h index 219f82f..3f8c88e 100644 --- a/include/linux/compiler.h +++ b/include/linux/compiler.h @@ -470,6 +470,10 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s #define __visible #endif +#ifndef __nostackprotector +# define __nostackprotector +#endif + /* * Assume alignment of return value. */
