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crypto: arm64/aes-cipher - move S-box to .rodata section 

Move the AES inverse S-box to the .rodata section where it is safe from
abuse by speculation.

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 12:11:37 +00:00 committed by Herbert Xu
parent cd0bb67f21
commit 96a74f7bdc
1 changed files with 10 additions and 9 deletions
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19
arch/arm64/crypto/aes-cipher-core.S
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@ -125,6 +125,16 @@ CPU_BE( rev w7, w7 )
ret ret
.endm .endm
ENTRY(__aes_arm64_encrypt)
do_crypt fround, crypto_ft_tab, crypto_ft_tab + 1, 2
ENDPROC(__aes_arm64_encrypt)
.align 5
ENTRY(__aes_arm64_decrypt)
do_crypt iround, crypto_it_tab, __aes_arm64_inverse_sbox, 0
ENDPROC(__aes_arm64_decrypt)
.section ".rodata", "a"
.align L1_CACHE_SHIFT .align L1_CACHE_SHIFT
.type __aes_arm64_inverse_sbox, %object .type __aes_arm64_inverse_sbox, %object
__aes_arm64_inverse_sbox: __aes_arm64_inverse_sbox:
@ -161,12 +171,3 @@ __aes_arm64_inverse_sbox:
.byte 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26 .byte 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26
.byte 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d .byte 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d
.size __aes_arm64_inverse_sbox, . - __aes_arm64_inverse_sbox .size __aes_arm64_inverse_sbox, . - __aes_arm64_inverse_sbox
ENTRY(__aes_arm64_encrypt)
do_crypt fround, crypto_ft_tab, crypto_ft_tab + 1, 2
ENDPROC(__aes_arm64_encrypt)
.align 5
ENTRY(__aes_arm64_decrypt)
do_crypt iround, crypto_it_tab, __aes_arm64_inverse_sbox, 0
ENDPROC(__aes_arm64_decrypt)