Commit-ID: 51bad67ffbce0aaa44579f84ef5d05597054ec6a Gitweb: https://git.kernel.org/tip/51bad67ffbce0aaa44579f84ef5d05597054ec6a Author: Alexey Dobriyan <[email protected]> AuthorDate: Tue, 8 May 2018 00:37:55 +0300 Committer: Ingo Molnar <[email protected]> CommitDate: Mon, 14 May 2018 11:43:03 +0200
x86/asm: Pad assembly functions with INT3 instructions Use INT3 instead of NOP. All that padding between functions is an illegal area, no legitimate code should jump into it. I've checked x86_64 allyesconfig disassembly, all changes looks sane: INT3 is only used after RET or unconditional JMP. Signed-off-by: Alexey Dobriyan <[email protected]> Acked-by: H. Peter Anvin <[email protected]> Acked-by: Thomas Gleixner <[email protected]> Cc: Andy Lutomirski <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: Brian Gerst <[email protected]> Cc: Denys Vlasenko <[email protected]> Cc: Josh Poimboeuf <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Peter Zijlstra <[email protected]> Link: http://lkml.kernel.org/r/20180507213755.GA32406@avx2 Signed-off-by: Ingo Molnar <[email protected]> --- arch/x86/include/asm/linkage.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/x86/include/asm/linkage.h b/arch/x86/include/asm/linkage.h index 14caa9d9fb7f..c0b70bc1e659 100644 --- a/arch/x86/include/asm/linkage.h +++ b/arch/x86/include/asm/linkage.h @@ -18,7 +18,7 @@ name: #if defined(CONFIG_X86_64) || defined(CONFIG_X86_ALIGNMENT_16) -#define __ALIGN .p2align 4, 0x90 +#define __ALIGN .p2align 4, 0xCC #define __ALIGN_STR __stringify(__ALIGN) #endif
