crypto: x86/des3_ede - Fix RBP usage

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Using RBP as a temporary register breaks frame pointer convention and
breaks stack traces when unwinding from an interrupt in the crypto code.

Use RSI instead of RBP for RT1.  Since RSI is also used as a the 'dst'
function argument, it needs to be saved on the stack until the argument
is needed.

Reported-by: Eric Biggers <ebiggers@google.com>
Reported-by: Peter Zijlstra <peterz@infradead.org>
Tested-by: Eric Biggers <ebiggers@google.com>
Acked-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

...

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Josh Poimboeuf 2017-09-18 14:42:04 -05:00 • committed by Herbert Xu

parent c66cc3be29

commit 3ed7b4d67c

1 changed files with 9 additions and 6 deletions

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arch/x86/crypto/des3_ede-asm_64.S

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