arm64/module: deal with ambiguity in PRELxx relocation ranges

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The R_AARCH64_PREL16 and R_AARCH64_PREL32 relocations are
documented as permitting a range of [-2^15 .. 2^16), resp.
[-2^31 .. 2^32). It is also documented that this means we
cannot detect overflow in some cases, which is bad.

Since we always interpret the targets of these relocations as
signed quantities (e.g., in the ksymtab handling code), let's
tighten the overflow checks so that targets that are out of
range for our signed interpretation of the relocated quantity
get flagged.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>

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Ard Biesheuvel 2019-05-23 11:38:54 +01:00 • committed by Will Deacon

parent 8212688600

commit 1cf24a2cc3

1 changed files with 14 additions and 2 deletions

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arch/arm64/kernel/module.c

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