This is a note to let you know that I've just added the patch titled
crypto: x86/sha256 - fix possible crash with CFI enabled
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
crypto-x86-sha256-fix-possible-crash-with-cfi-enable.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 82afa612ebabe68a9cbdf7fc1525dc60fef9a054
Author: Eric Biggers <ebiggers@xxxxxxxxxx>
Date: Fri Nov 18 11:44:14 2022 -0800
crypto: x86/sha256 - fix possible crash with CFI enabled
[ Upstream commit 19940ebbb59c12146d05c5f8acd873197b290648 ]
sha256_transform_ssse3(), sha256_transform_avx(),
sha256_transform_rorx(), and sha256_ni_transform() 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: ccace936eec7 ("x86: Add types to indirectly called assembly functions")
Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Sami Tolvanen <samitolvanen@xxxxxxxxxx>
Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/x86/crypto/sha256-avx-asm.S b/arch/x86/crypto/sha256-avx-asm.S
index 3baa1ec39097..06ea30c20828 100644
--- a/arch/x86/crypto/sha256-avx-asm.S
+++ b/arch/x86/crypto/sha256-avx-asm.S
@@ -48,6 +48,7 @@
########################################################################
#include <linux/linkage.h>
+#include <linux/cfi_types.h>
## assume buffers not aligned
#define VMOVDQ vmovdqu
@@ -346,7 +347,7 @@ a = TMP_
## arg 3 : Num blocks
########################################################################
.text
-SYM_FUNC_START(sha256_transform_avx)
+SYM_TYPED_FUNC_START(sha256_transform_avx)
.align 32
pushq %rbx
pushq %r12
diff --git a/arch/x86/crypto/sha256-avx2-asm.S b/arch/x86/crypto/sha256-avx2-asm.S
index 9bcdbc47b8b4..2d2be531a11e 100644
--- a/arch/x86/crypto/sha256-avx2-asm.S
+++ b/arch/x86/crypto/sha256-avx2-asm.S
@@ -49,6 +49,7 @@
########################################################################
#include <linux/linkage.h>
+#include <linux/cfi_types.h>
## assume buffers not aligned
#define VMOVDQ vmovdqu
@@ -523,7 +524,7 @@ STACK_SIZE = _CTX + _CTX_SIZE
## arg 3 : Num blocks
########################################################################
.text
-SYM_FUNC_START(sha256_transform_rorx)
+SYM_TYPED_FUNC_START(sha256_transform_rorx)
.align 32
pushq %rbx
pushq %r12
diff --git a/arch/x86/crypto/sha256-ssse3-asm.S b/arch/x86/crypto/sha256-ssse3-asm.S
index c4a5db612c32..7db28839108d 100644
--- a/arch/x86/crypto/sha256-ssse3-asm.S
+++ b/arch/x86/crypto/sha256-ssse3-asm.S
@@ -47,6 +47,7 @@
########################################################################
#include <linux/linkage.h>
+#include <linux/cfi_types.h>
## assume buffers not aligned
#define MOVDQ movdqu
@@ -355,7 +356,7 @@ a = TMP_
## arg 3 : Num blocks
########################################################################
.text
-SYM_FUNC_START(sha256_transform_ssse3)
+SYM_TYPED_FUNC_START(sha256_transform_ssse3)
.align 32
pushq %rbx
pushq %r12
diff --git a/arch/x86/crypto/sha256_ni_asm.S b/arch/x86/crypto/sha256_ni_asm.S
index 94d50dd27cb5..47f93937f798 100644
--- a/arch/x86/crypto/sha256_ni_asm.S
+++ b/arch/x86/crypto/sha256_ni_asm.S
@@ -54,6 +54,7 @@
*/
#include <linux/linkage.h>
+#include <linux/cfi_types.h>
#define DIGEST_PTR %rdi /* 1st arg */
#define DATA_PTR %rsi /* 2nd arg */
@@ -97,7 +98,7 @@
.text
.align 32
-SYM_FUNC_START(sha256_ni_transform)
+SYM_TYPED_FUNC_START(sha256_ni_transform)
shl $6, NUM_BLKS /* convert to bytes */
jz .Ldone_hash
