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Signed-off-by: Dave Rodgman <dave.rodgman@arm.com>
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Dave Rodgman 2023-09-07 12:01:29 +01:00
parent 3fc3ae708e
commit 241a80b717
1 changed files with 4 additions and 5 deletions
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ChangeLog.d/safer-ct.txt
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@ -1,7 +1,6 @@
Security Security
* Updates to constant time C code so that compilers are less likely to use * Updates to constant-time C code so that compilers are less likely to use
conditional instructions, which might have an observable difference in conditional instructions, which can have an observable difference in
timing (Clang was observed to generate conditional instructions). timing. (Clang has been seen to do this.) Also introduce assembly
Introduce assembly implementations of constant time code for implementations for 32 and 64-bit Arm and for x86 and x86-64, which are
Thumb 1 & Thumb 2, 32-bit Arm, aarch64, x86 and x86-64, which are
guaranteed not to use conditional instructions. guaranteed not to use conditional instructions.