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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
This commit is contained in:
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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4
arch/arm64/kernel/alternative.c
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@ -133,8 +133,8 @@ static void clean_dcache_range_nopatch(u64 start, u64 end)
} while (cur += d_size, cur < end);
}
static void __apply_alternatives(void *alt_region, bool is_module,
unsigned long *feature_mask)
static void __nocfi __apply_alternatives(void *alt_region, bool is_module,
unsigned long *feature_mask)
{
struct alt_instr *alt;
struct alt_region *region = alt_region;