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x86/build: Add asserts for unwanted sections

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In preparation for warning on orphan sections, enforce other
expected-to-be-zero-sized sections (since discarding them might hide
problems with them suddenly gaining unexpected entries).

Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20200821194310.3089815-25-keescook@chromium.org
This commit is contained in:
Kees Cook 2020-08-21 12:43:05 -07:00 committed by Ingo Molnar
parent 815d680771
commit 5354e84598
1 changed files with 24 additions and 0 deletions
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24
arch/x86/kernel/vmlinux.lds.S
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@ -427,6 +427,30 @@ SECTIONS
SIZEOF(.got.plt) == 0xc,
#endif
"Unexpected GOT/PLT entries detected!")
/*
* Sections that should stay zero sized, which is safer to
* explicitly check instead of blindly discarding.
*/
.got : {
*(.got) *(.igot.*)
}
ASSERT(SIZEOF(.got) == 0, "Unexpected GOT entries detected!")
.plt : {
*(.plt) *(.plt.*) *(.iplt)
}
ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!")
.rel.dyn : {
*(.rel.*) *(.rel_*)
}
ASSERT(SIZEOF(.rel.dyn) == 0, "Unexpected run-time relocations (.rel) detected!")
.rela.dyn : {
*(.rela.*) *(.rela_*)
}
ASSERT(SIZEOF(.rela.dyn) == 0, "Unexpected run-time relocations (.rela) detected!")
}
#ifdef CONFIG_X86_32