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x86/asm: Avoid generating unused kprobe sections

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When !CONFIG_KPROBES, do not generate kprobe sections. This makes
sure there are no unexpected sections encountered by the linker scripts.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200821194310.3089815-23-keescook@chromium.org
This commit is contained in:
Kees Cook 2020-08-21 12:43:03 -07:00 committed by Ingo Molnar
parent 7e8c4ed263
commit a850958c07
1 changed files with 5 additions and 1 deletions
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6
arch/x86/include/asm/asm.h
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@ -138,11 +138,15 @@
# define _ASM_EXTABLE_FAULT(from, to) \
_ASM_EXTABLE_HANDLE(from, to, ex_handler_fault)
# define _ASM_NOKPROBE(entry) \
# ifdef CONFIG_KPROBES
# define _ASM_NOKPROBE(entry) \
.pushsection "_kprobe_blacklist","aw" ; \
_ASM_ALIGN ; \
_ASM_PTR (entry); \
.popsection
# else
# define _ASM_NOKPROBE(entry)
# endif
#else /* ! __ASSEMBLY__ */
# define _EXPAND_EXTABLE_HANDLE(x) #x