crypto: x86/sha512 - fix possible crash with CFI enabled

[ Upstream commit a1d72fa ] sha512_transform_ssse3(), sha512_transform_avx(), and sha512_transform_rorx() are called via indirect function calls. Therefore they need to use SYM_TYPED_FUNC_START instead of SYM_FUNC_START to cause their type hashes 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 calls). Fixes: ccace93 ("x86: Add types to indirectly 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>
xanmod · Dec 31, 2022 · ae25264 · ae25264
1 parent 76994f2
commit ae25264
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Showing 3 changed files with 6 additions and 3 deletions.
diff --git a/arch/x86/crypto/sha512-avx-asm.S b/arch/x86/crypto/sha512-avx-asm.S
@@ -48,6 +48,7 @@
 ########################################################################
 
 #include <linux/linkage.h>
+#include <linux/cfi_types.h>
 
 .text
 
@@ -273,7 +274,7 @@ frame_size = frame_WK + WK_SIZE
 # of SHA512 message blocks.
 # "blocks" is the message length in SHA512 blocks
 ########################################################################
-SYM_FUNC_START(sha512_transform_avx)
+SYM_TYPED_FUNC_START(sha512_transform_avx)
 	test msglen, msglen
 	je nowork
 

diff --git a/arch/x86/crypto/sha512-avx2-asm.S b/arch/x86/crypto/sha512-avx2-asm.S
@@ -50,6 +50,7 @@
 ########################################################################
 
 #include <linux/linkage.h>
+#include <linux/cfi_types.h>
 
 .text
 
@@ -565,7 +566,7 @@ frame_size = frame_CTX + CTX_SIZE
 # of SHA512 message blocks.
 # "blocks" is the message length in SHA512 blocks
 ########################################################################
-SYM_FUNC_START(sha512_transform_rorx)
+SYM_TYPED_FUNC_START(sha512_transform_rorx)
 	# Save GPRs
 	push	%rbx
 	push	%r12

diff --git a/arch/x86/crypto/sha512-ssse3-asm.S b/arch/x86/crypto/sha512-ssse3-asm.S
@@ -48,6 +48,7 @@
 ########################################################################
 
 #include <linux/linkage.h>
+#include <linux/cfi_types.h>
 
 .text
 
@@ -274,7 +275,7 @@ frame_size = frame_WK + WK_SIZE
 # of SHA512 message blocks.
 # "blocks" is the message length in SHA512 blocks.
 ########################################################################
-SYM_FUNC_START(sha512_transform_ssse3)
+SYM_TYPED_FUNC_START(sha512_transform_ssse3)
 
 	test msglen, msglen
 	je nowork