Re: [PATCH v2] lib/mpi: call cond_resched() from mpi_powm() loop

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On Wed, 8 Nov 2017, Eric Biggers wrote:

On Wed, Nov 08, 2017 at 08:17:12PM +0000, David Howells wrote:
Eric Biggers <ebiggers3@xxxxxxxxx> 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.

CONFIG_KEY_DH_OPERATIONS and use of mpi_powm() by KEYCTL_DH_COMPUTE goes back to v4.7, when the MPI library was called directly. KPP was not implemented yet.

--
Mat Martineau
Intel OTC



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