This aligns the stack pointer in chacha20_4block_xor_ssse3 to 64 bytes.
Fixes general protection faults and potential kernel panics.
Cc: sta...@vger.kernel.org
Signed-off-by: Eli Cooper <elicoo...@gmx.com>
---
arch/x86/crypto/chacha20-ssse3-x86_64.S | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/arch/x86/crypto/chacha20-ssse3-x86_64.S
b/arch/x86/crypto/chacha20-ssse3-x86_64.S
index 712b130..3a33124 100644
--- a/arch/x86/crypto/chacha20-ssse3-x86_64.S
+++ b/arch/x86/crypto/chacha20-ssse3-x86_64.S
@@ -157,7 +157,9 @@ ENTRY(chacha20_4block_xor_ssse3)
# done with the slightly better performing SSSE3 byte shuffling,
# 7/12-bit word rotation uses traditional shift+OR.
- sub $0x40,%rsp
+ mov %rsp,%r11
+ sub $0x80,%rsp
+ and $~63,%rsp
# x0..15[0-3] = s0..3[0..3]
movq 0x00(%rdi),%xmm1
@@ -620,6 +622,6 @@ ENTRY(chacha20_4block_xor_ssse3)
pxor %xmm1,%xmm15
movdqu %xmm15,0xf0(%rsi)
- add $0x40,%rsp
+ mov %r11,%rsp
ret
ENDPROC(chacha20_4block_xor_ssse3)
--
2.7.0
--
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