On Tue, Aug 05, 2025 at 04:44:27PM +0300, Jarkko Sakkinen wrote:
> On Thu, Jul 31, 2025 at 02:23:52PM -0700, Eric Biggers wrote:
> > To prevent timing attacks, HMAC value comparison needs to be constant
> > time. Replace the memcmp() with the correct function, crypto_memneq().
> >
> > Fixes: d00a1c72f7f4 ("keys: add new trusted key-type")
> > Cc: sta...@vger.kernel.org
> > Signed-off-by: Eric Biggers <ebigg...@kernel.org>
>
> Was crypto_memneq() available at the time?
No. The Fixes commit is still correct, though, as it's the commit that
introduced the memcmp(). Technically it was still a bug at that time,
even if there wasn't a helper function available yet.
- Eric
