Move the AES inverse S-box to the .rodata section where it is safe from
abuse by speculation.
Signed-off-by: Ard Biesheuvel <ard.biesheu...@linaro.org>
---
arch/arm64/crypto/aes-cipher-core.S | 19 ++++++++++---------
1 file changed, 10 insertions(+), 9 deletions(-)
diff --git a/arch/arm64/crypto/aes-cipher-core.S
b/arch/arm64/crypto/aes-cipher-core.S
index 6d2445d603cc..3a44eada2347 100644
--- a/arch/arm64/crypto/aes-cipher-core.S
+++ b/arch/arm64/crypto/aes-cipher-core.S
@@ -125,6 +125,16 @@ CPU_BE( rev w7, w7 )
ret
.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
.type __aes_arm64_inverse_sbox, %object
__aes_arm64_inverse_sbox:
@@ -161,12 +171,3 @@ __aes_arm64_inverse_sbox:
.byte 0x17, 0x2b, 0x04, 0x7e, 0xba, 0x77, 0xd6, 0x26
.byte 0xe1, 0x69, 0x14, 0x63, 0x55, 0x21, 0x0c, 0x7d
.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)
--
2.11.0
