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crypto: arm64/sha2-ce - move the round constant table to .rodata section 

Move the SHA2 round constant table to the .rodata section where it is
safe from being exploited by speculative execution.

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 12:11:41 +00:00 committed by Herbert Xu
parent 325f562d8f
commit 17a0607019
1 changed files with 3 additions and 1 deletions
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4
arch/arm64/crypto/sha2-ce-core.S
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@ -53,6 +53,7 @@
/*
* The SHA-256 round constants
*/
.section ".rodata", "a"
.align 4
.Lsha2_rcon:
.word 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5
@ -76,9 +77,10 @@
* void sha2_ce_transform(struct sha256_ce_state *sst, u8 const *src,
* int blocks)
*/
.text
ENTRY(sha2_ce_transform)
/* load round constants */
adr x8, .Lsha2_rcon
adr_l x8, .Lsha2_rcon
ld1 { v0.4s- v3.4s}, [x8], #64
ld1 { v4.4s- v7.4s}, [x8], #64
ld1 { v8.4s-v11.4s}, [x8], #64