arm64: add __nocfi to __apply_alternatives

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__apply_alternatives makes indirect calls to functions whose address
is taken in assembly code using the alternative_cb macro. With
non-canonical CFI, the compiler won't replace these function
references with the jump table addresses, which trips CFI. Disable CFI
checking in the function to work around the issue.

Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20210408182843.1754385-16-samitolvanen@google.com

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Sami Tolvanen 2021-04-08 11:28:40 -07:00 • committed by Kees Cook

parent cbdac8413e

commit 9562f3dc6f

1 changed files with 2 additions and 2 deletions

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arch/arm64/kernel/alternative.c

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