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crypto: arm64/sm3 - fix possible crash with CFI enabled

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[ Upstream commit be8f6b6496 ]

sm3_neon_transform() is called via indirect function calls.  Therefore
it needs to use SYM_TYPED_FUNC_START instead of SYM_FUNC_START to cause
its type hash to be emitted when the kernel is built with
CONFIG_CFI_CLANG=y.  Otherwise, the code crashes with a CFI failure (if
the compiler didn't happen to optimize out the indirect call).

Fixes: c50d32859e ("arm64: Add types to indirect called assembly functions")
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Eric Biggers 2022-11-18 11:44:19 -08:00 committed by Greg Kroah-Hartman
parent 9c1b30d5c1
commit 4841596b93
1 changed files with 2 additions and 1 deletions
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3
arch/arm64/crypto/sm3-neon-core.S
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@ -9,6 +9,7 @@
*/
#include <linux/linkage.h>
#include <linux/cfi_types.h>
#include <asm/assembler.h>
/* Context structure */
@ -351,7 +352,7 @@
*/
.text
.align 3
SYM_FUNC_START(sm3_neon_transform)
SYM_TYPED_FUNC_START(sm3_neon_transform)
ldp ra, rb, [RSTATE, #0]
ldp rc, rd, [RSTATE, #8]
ldp re, rf, [RSTATE, #16]