The following commit has been merged into the objtool/core branch of tip: Commit-ID: dabe5167a3cbb4bf16b20c0e5b6497513e2e3a08 Gitweb: https://git.kernel.org/tip/dabe5167a3cbb4bf16b20c0e5b6497513e2e3a08 Author: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> AuthorDate: Wed, 24 Feb 2021 10:29:18 -06:00 Committer: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> CommitterDate: Mon, 19 Apr 2021 12:36:34 -05:00 x86/crypto/camellia-aesni-avx2: Unconditionally allocate stack buffer A conditional stack allocation violates traditional unwinding requirements when a single instruction can have differing stack layouts. There's no benefit in allocating the stack buffer conditionally. Just do it unconditionally. Signed-off-by: Josh Poimboeuf <jpoimboe@xxxxxxxxxx> Tested-by: Ard Biesheuvel <ardb@xxxxxxxxxx> Acked-by: Ard Biesheuvel <ardb@xxxxxxxxxx> Tested-by: Sami Tolvanen <samitolvanen@xxxxxxxxxx> Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Acked-by: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> Link: https://lore.kernel.org/r/85ac96613ee5784b6239c18d3f68b1f3c509caa3.1614182415.git.jpoimboe@xxxxxxxxxx --- arch/x86/crypto/camellia-aesni-avx2-asm_64.S | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/arch/x86/crypto/camellia-aesni-avx2-asm_64.S b/arch/x86/crypto/camellia-aesni-avx2-asm_64.S index 782e971..706f708 100644 --- a/arch/x86/crypto/camellia-aesni-avx2-asm_64.S +++ b/arch/x86/crypto/camellia-aesni-avx2-asm_64.S @@ -990,6 +990,7 @@ SYM_FUNC_START(camellia_cbc_dec_32way) * %rdx: src (32 blocks) */ FRAME_BEGIN + subq $(16 * 32), %rsp; vzeroupper; @@ -1002,7 +1003,6 @@ SYM_FUNC_START(camellia_cbc_dec_32way) %ymm8, %ymm9, %ymm10, %ymm11, %ymm12, %ymm13, %ymm14, %ymm15, %rdx, (key_table)(CTX, %r8, 8)); - movq %rsp, %r10; cmpq %rsi, %rdx; je .Lcbc_dec_use_stack; @@ -1015,7 +1015,6 @@ SYM_FUNC_START(camellia_cbc_dec_32way) * dst still in-use (because dst == src), so use stack for temporary * storage. */ - subq $(16 * 32), %rsp; movq %rsp, %rax; .Lcbc_dec_continue: @@ -1025,7 +1024,6 @@ SYM_FUNC_START(camellia_cbc_dec_32way) vpxor %ymm7, %ymm7, %ymm7; vinserti128 $1, (%rdx), %ymm7, %ymm7; vpxor (%rax), %ymm7, %ymm7; - movq %r10, %rsp; vpxor (0 * 32 + 16)(%rdx), %ymm6, %ymm6; vpxor (1 * 32 + 16)(%rdx), %ymm5, %ymm5; vpxor (2 * 32 + 16)(%rdx), %ymm4, %ymm4; @@ -1047,6 +1045,7 @@ SYM_FUNC_START(camellia_cbc_dec_32way) vzeroupper; + addq $(16 * 32), %rsp; FRAME_END ret; SYM_FUNC_END(camellia_cbc_dec_32way)
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