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crypto: arm64/sha1-ce - get rid of literal pool 

Load the four SHA-1 round constants using immediates rather than literal
pool entries, to avoid having executable data that may be exploitable
under speculation attacks.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ard Biesheuvel 2018-01-10 12:11:42 +00:00 committed by Herbert Xu
parent 17a0607019
commit 20b04c02bc
1 changed files with 9 additions and 11 deletions
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20
arch/arm64/crypto/sha1-ce-core.S
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@ -58,12 +58,11 @@
sha1su1 v\s0\().4s, v\s3\().4s
.endm
/*
* The SHA1 round constants
*/
.align 4
.Lsha1_rcon:
.word 0x5a827999, 0x6ed9eba1, 0x8f1bbcdc, 0xca62c1d6
.macro loadrc, k, val, tmp
movz \tmp, :abs_g0_nc:\val
movk \tmp, :abs_g1:\val
dup \k, \tmp
.endm
/*
* void sha1_ce_transform(struct sha1_ce_state *sst, u8 const *src,
@ -71,11 +70,10 @@
*/
ENTRY(sha1_ce_transform)
/* load round constants */
adr x6, .Lsha1_rcon
ld1r {k0.4s}, [x6], #4
ld1r {k1.4s}, [x6], #4
ld1r {k2.4s}, [x6], #4
ld1r {k3.4s}, [x6]
loadrc k0.4s, 0x5a827999, w6
loadrc k1.4s, 0x6ed9eba1, w6
loadrc k2.4s, 0x8f1bbcdc, w6
loadrc k3.4s, 0xca62c1d6, w6
/* load state */
ld1 {dgav.4s}, [x0]