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[3/7] arm64/crypto: aes-neon: move literal data to .rodata section

Message ID 20180110121142.18291-4-ard.biesheuvel@linaro.org
State Accepted
Commit 62c24708761aa41fcda5986170276b7aa2669798
Headers show
Series arm64: move literal data into .rodata section | expand

Commit Message

Ard Biesheuvel Jan. 10, 2018, 12:11 p.m. UTC 
Move the S-boxes and some other literals to the .rodata section where
it is safe from being exploited by speculative execution.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

---
 arch/arm64/crypto/aes-neon.S | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

-- 
2.11.0
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Patch

diff --git a/arch/arm64/crypto/aes-neon.S b/arch/arm64/crypto/aes-neon.S
index f1e3aa2732f9..1c7b45b7268e 100644
--- a/arch/arm64/crypto/aes-neon.S
+++ b/arch/arm64/crypto/aes-neon.S
@@ -32,10 +32,10 @@ 
 
 	/* preload the entire Sbox */
 	.macro		prepare, sbox, shiftrows, temp
-	adr		\temp, \sbox
 	movi		v12.16b, #0x1b
-	ldr		q13, \shiftrows
-	ldr		q14, .Lror32by8
+	ldr_l		q13, \shiftrows, \temp
+	ldr_l		q14, .Lror32by8, \temp
+	adr_l		\temp, \sbox
 	ld1		{v16.16b-v19.16b}, [\temp], #64
 	ld1		{v20.16b-v23.16b}, [\temp], #64
 	ld1		{v24.16b-v27.16b}, [\temp], #64
@@ -272,7 +272,7 @@ 
 
 #include "aes-modes.S"
 
-	.text
+	.section	".rodata", "a"
 	.align		6
 .LForward_Sbox:
 	.byte		0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5