[PATCH 4.6 021/100] crypto: sha1-mb - make sha1_x8_avx2() conform to C function ABI

From: Greg Kroah-Hartman
Date: Mon May 30 2016 - 17:26:22 EST

4.6-stable review patch. If anyone has any objections, please let me know.


From: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>

commit 4a6b27b79da5ccc6b85dc05bbe6a091e58be896a upstream.

Megha Dey reported a kernel panic in crypto code. The problem is that
sha1_x8_avx2() clobbers registers r12-r15 without saving and restoring

Before commit aec4d0e301f1 ("x86/asm/crypto: Simplify stack usage in
sha-mb functions"), those registers were saved and restored by the
callers of the function. I removed them with that commit because I
didn't realize sha1_x8_avx2() clobbered them.

Fix the potential undefined behavior associated with clobbering the
registers and make the behavior less surprising by changing the
registers to be callee saved/restored to conform with the C function
call ABI.

Also, rdx (aka RSP_SAVE) doesn't need to be saved: I verified that none
of the callers rely on it being saved, and it's not a callee-saved
register in the C ABI.

Fixes: aec4d0e301f1 ("x86/asm/crypto: Simplify stack usage in sha-mb functions")
Reported-by: Megha Dey <megha.dey@xxxxxxxxxxxxxxx>
Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx>
Signed-off-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

arch/x86/crypto/sha-mb/sha1_x8_avx2.S | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)

--- a/arch/x86/crypto/sha-mb/sha1_x8_avx2.S
+++ b/arch/x86/crypto/sha-mb/sha1_x8_avx2.S
@@ -296,7 +296,11 @@ W14 = TMP_

- push RSP_SAVE
+ # save callee-saved clobbered registers to comply with C function ABI
+ push %r12
+ push %r13
+ push %r14
+ push %r15

#save rsp
mov %rsp, RSP_SAVE
@@ -446,7 +450,12 @@ lloop:
## Postamble

mov RSP_SAVE, %rsp
- pop RSP_SAVE
+ # restore callee-saved clobbered registers
+ pop %r15
+ pop %r14
+ pop %r13
+ pop %r12