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x86/build: Enforce an empty .got.plt section 

The .got.plt section should always be zero (or filled only with the
linker-generated lazy dispatch entry). Enforce this with an assert and
mark the section as INFO. This is more sensitive than just blindly
discarding the section.

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200821194310.3089815-24-keescook@chromium.org
This commit is contained in:
Kees Cook 2020-08-21 12:43:04 -07:00 committed by Ingo Molnar
parent a850958c07
commit 815d680771
1 changed files with 13 additions and 1 deletions
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14
arch/x86/kernel/vmlinux.lds.S
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@ -414,8 +414,20 @@ SECTIONS
ELF_DETAILS
DISCARDS
}
/*
* Make sure that the .got.plt is either completely empty or it
* contains only the lazy dispatch entries.
*/
.got.plt (INFO) : { *(.got.plt) }
ASSERT(SIZEOF(.got.plt) == 0 ||
#ifdef CONFIG_X86_64
SIZEOF(.got.plt) == 0x18,
#else
SIZEOF(.got.plt) == 0xc,
#endif
"Unexpected GOT/PLT entries detected!")
}
#ifdef CONFIG_X86_32
/*