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arm64/build: Assert for unwanted sections

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

Suggested-by: Ard Biesheuvel <ardb@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20200821194310.3089815-14-keescook@chromium.org
This commit is contained in:
Kees Cook 2020-08-21 12:42:54 -07:00 committed by Ingo Molnar
parent 578d7f0fd6
commit be2881824a
1 changed files with 20 additions and 0 deletions
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20
arch/arm64/kernel/vmlinux.lds.S
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@ -121,6 +121,14 @@ SECTIONS
*(.got) /* Global offset table */
}
/*
* Make sure that the .got.plt is either completely empty or it
* contains only the lazy dispatch entries.
*/
.got.plt : { *(.got.plt) }
ASSERT(SIZEOF(.got.plt) == 0 || SIZEOF(.got.plt) == 0x18,
"Unexpected GOT/PLT entries detected!")
. = ALIGN(SEGMENT_ALIGN);
_etext = .; /* End of text section */
@ -243,6 +251,18 @@ SECTIONS
ELF_DETAILS
HEAD_SYMBOLS
/*
* Sections that should stay zero sized, which is safer to
* explicitly check instead of blindly discarding.
*/
.plt : {
*(.plt) *(.plt.*) *(.iplt) *(.igot)
}
ASSERT(SIZEOF(.plt) == 0, "Unexpected run-time procedure linkages detected!")
.data.rel.ro : { *(.data.rel.ro) }
ASSERT(SIZEOF(.data.rel.ro) == 0, "Unexpected RELRO detected!")
}
#include "image-vars.h"