Re: Deadlock when using crypto API for block devices

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Fri, Aug 24, 2018 at 09:00:00AM -0400, Mikulas Patocka wrote:
>
> BTW. gcmaes_crypt_by_sg also contains GFP_ATOMIC and -ENOMEM, behind a 
> pretty complex condition. Do you mean that this condition is part of the 
> contract that the crypto API provides?

This is an implementation defect.  I think for this case we should
fall back to software GCM if the accelerated version fails.

> Should "req->src->offset + req->src->length < PAGE_SIZE" use "<=" instead? 
> Because if the data ends up at page boundary, it will use the atomic 
> allocation that can fail.

This condition does look strange.  It's introduced by the commit
e845520707f85c539ce04bb73c6070e9441480be.   Dave, what exactly is
it meant to do?

Thanks,
-- 
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt

--
dm-devel mailing list
dm-devel@xxxxxxxxxx
https://www.redhat.com/mailman/listinfo/dm-devel



[Index of Archives]     [DM Crypt]     [Fedora Desktop]     [ATA RAID]     [Fedora Marketing]     [Fedora Packaging]     [Fedora SELinux]     [Yosemite Discussion]     [KDE Users]     [Fedora Docs]

  Powered by Linux