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UPSTREAM: crypto: x86/poly1305 - Clear key material from stack in SSE2 variant

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1-block SSE2 variant of poly1305 stores variables s1..s4 containing key
material on the stack. This commit adds missing zeroing of the stack
memory. Benchmarks show negligible performance hit (tested on i7-3770).

Signed-off-by: Tommi Hirvola <tommi@hirvola.fi>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
(cherry picked from commit 7748168c66404a3ee732972a3a55b5332245eb25)
Bug: 152722841
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Iada3921d6f93921385c4f1229973511c163d5aab
This commit is contained in:
Tommi Hirvola 2019-02-19 17:45:54 +02:00 committed by Greg Kroah-Hartman
parent 2be733e152
commit 0227da548c
1 changed files with 4 additions and 0 deletions
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4
arch/x86/crypto/poly1305-sse2-x86_64.S
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@ -272,6 +272,10 @@ ENTRY(poly1305_block_sse2)
dec %rcx
jnz .Ldoblock
# Zeroing of key material
mov %rcx,0x00(%rsp)
mov %rcx,0x08(%rsp)
add $0x10,%rsp
pop %r12
pop %rbx