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SubjectRe: [PATCH v2] lib/mpi: call cond_resched() from mpi_powm() loop
On Wed, Nov 08, 2017 at 08:17:12PM +0000, David Howells wrote:
> Eric Biggers <ebiggers3@gmail.com> wrote:
>
> > This probably should be grouped with my series "crypto: dh - input validation
> > fixes", as this is also a fix for Diffie-Hellman. I was actually expecting
> > Herbert Xu to take these patches, as Diffie-Hellman is now part of the crypto
> > API (crypto/dh.c); none of the patches actually touch security/keys/.
>
> Fine by me.
>
> > If you'd like to maintain the Diffie-Hellman implementation(s) you should
> > get yourself added to MAINTAINERS for the relevant files.
>
> It touches the MPI lib, though, so it also potentially affects RSA and stuff,
> which is why I introduced it to the kernel originally.
>

True, mpi_powm() might also be reachable by adding a key of type "asymmetric",
in which case this fix would need to go to older kernels than v4.12. If I have
a chance I'll see if I can find a reproducer.

Eric

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