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ANDROID: 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 CFI enabled
using non-canonical jump tables, the compiler isn't able to replace the
function reference with the jump table reference, which trips CFI.

Bug: 145210207
Change-Id: I6cdd164f9315c0aa16a1427ab1a67cfa8aad3ffd
Signed-off-by: Sami Tolvanen <samitolvanen@google.com>
This commit is contained in:
Sami Tolvanen 2019-08-16 11:32:43 -07:00 committed by Alistair Delva
parent 7d6a5a0eab
commit 2e34bc14ef
1 changed files with 2 additions and 2 deletions
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4
arch/arm64/kernel/alternative.c
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@ -144,8 +144,8 @@ 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;