[2/7] arm64/crypto: aes-cipher: move S-box to .rodata section
diff mbox

Message ID 20180110121142.18291-3-ard.biesheuvel@linaro.org
State Accepted
Delegated to: Herbert Xu
Headers show

Commit Message

Ard Biesheuvel Jan. 10, 2018, 12:11 p.m. UTC
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>
---
 arch/arm64/crypto/aes-cipher-core.S | 19 ++++++++++---------
 1 file changed, 10 insertions(+), 9 deletions(-)

Patch
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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)