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x86/asm: Add ASM_UNREACHABLE

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This creates an unreachable annotation in asm for CONFIG_STACK_VALIDATION=y.
While here, adjust earlier uses of \t\n into \n\t.

Suggested-by: Josh Poimboeuf <[email protected]>
Signed-off-by: Kees Cook <[email protected]>
Cc: Alexey Dobriyan <[email protected]>
Cc: Andrew Morton <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: David S. Miller <[email protected]>
Cc: Davidlohr Bueso <[email protected]>
Cc: Elena Reshetova <[email protected]>
Cc: Eric Biggers <[email protected]>
Cc: Eric W. Biederman <[email protected]>
Cc: Greg KH <[email protected]>
Cc: Hans Liljestrand <[email protected]>
Cc: James Bottomley <[email protected]>
Cc: Jann Horn <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Manfred Spraul <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Rik van Riel <[email protected]>
Cc: Serge E. Hallyn <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: linux-arch <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Kees Cook authored and Ingo Molnar committed 2017-07-25 11:18:09 +02:00
1 parent df3405245a
commit aa5d1b8150
2 files changed
+12 -4
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include/linux/compiler-gcc.h
+9 -4
View File
@@ -203,11 +203,16 @@
#ifdef CONFIG_STACK_VALIDATION
#define annotate_unreachable() ({ \
asm("%c0:\t\n" \
".pushsection .discard.unreachable\t\n" \
".long %c0b - .\t\n" \
".popsection\t\n" : : "i" (__LINE__)); \
asm("%c0:\n\t" \
".pushsection .discard.unreachable\n\t" \
".long %c0b - .\n\t" \
".popsection\n\t" : : "i" (__LINE__)); \
})
#define ASM_UNREACHABLE \
"999:\n\t" \
".pushsection .discard.unreachable\n\t" \
".long 999b - .\n\t" \
".popsection\n\t"
#else
#define annotate_unreachable()
#endif
include/linux/compiler.h
+3
View File
@@ -185,6 +185,9 @@ void ftrace_likely_update(struct ftrace_likely_data *f, int val,
#endif
/* Unreachable code */
#ifndef ASM_UNREACHABLE
# define ASM_UNREACHABLE
#endif
#ifndef unreachable
# define unreachable() do { } while (1)
#endif