Re: [PATCH v5 2/2] KEYS: asymmetric: Copy sig and digest in public_key_verify_signature()

From: Roberto Sassu <roberto.sassu@huaweicloud.com>
To: Jarkko Sakkinen <jarkko@kernel.org>, Eric Biggers <ebiggers@kernel.org>
Cc: David Howells <dhowells@redhat.com>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	davem@davemloft.net, zohar@linux.ibm.com,
	dmitry.kasatkin@gmail.com, paul@paul-moore.com,
	jmorris@namei.org, serge@hallyn.com,
	linux-integrity@vger.kernel.org,
	linux-security-module@vger.kernel.org, keyrings@vger.kernel.org,
	linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org,
	stable@vger.kernel.org, Roberto Sassu <roberto.sassu@huawei.com>
Subject: Re: [PATCH v5 2/2] KEYS: asymmetric: Copy sig and digest in public_key_verify_signature()
Date: Fri, 26 May 2023 09:35:47 +0200	[thread overview]
Message-ID: <a4cefa07e717bd99fa0ae8e5f18950d69145bd24.camel@huaweicloud.com> (raw)
In-Reply-To: <Y+W/fwRbzj5A5v44@kernel.org>

On Fri, 2023-02-10 at 05:52 +0200, Jarkko Sakkinen wrote:
> On Thu, Feb 09, 2023 at 06:53:37PM +0000, Eric Biggers wrote:
> > On Thu, Feb 09, 2023 at 11:49:19AM +0100, Roberto Sassu wrote:
> > > On Fri, 2023-01-27 at 09:27 +0100, Roberto Sassu wrote:
> > > > On Thu, 2022-12-29 at 14:39 -0800, Eric Biggers wrote:
> > > > > On Tue, Dec 27, 2022 at 03:27:40PM +0100, Roberto Sassu wrote:
> > > > > > From: Roberto Sassu <roberto.sassu@huawei.com>
> > > > > > 
> > > > > > Commit ac4e97abce9b8 ("scatterlist: sg_set_buf() argument must be in linear
> > > > > > mapping") checks that both the signature and the digest reside in the
> > > > > > linear mapping area.
> > > > > > 
> > > > > > However, more recently commit ba14a194a434c ("fork: Add generic vmalloced
> > > > > > stack support") made it possible to move the stack in the vmalloc area,
> > > > > > which is not contiguous, and thus not suitable for sg_set_buf() which needs
> > > > > > adjacent pages.
> > > > > > 
> > > > > > Always make a copy of the signature and digest in the same buffer used to
> > > > > > store the key and its parameters, and pass them to sg_init_one(). Prefer it
> > > > > > to conditionally doing the copy if necessary, to keep the code simple. The
> > > > > > buffer allocated with kmalloc() is in the linear mapping area.
> > > > > > 
> > > > > > Cc: stable@vger.kernel.org # 4.9.x
> > > > > > Fixes: ba14a194a434 ("fork: Add generic vmalloced stack support")
> > > > > > Link: https://lore.kernel.org/linux-integrity/Y4pIpxbjBdajymBJ@sol.localdomain/
> > > > > > Suggested-by: Eric Biggers <ebiggers@kernel.org>
> > > > > > Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com>
> > > > > > ---
> > > > > >  crypto/asymmetric_keys/public_key.c | 38 ++++++++++++++++-------------
> > > > > >  1 file changed, 21 insertions(+), 17 deletions(-)
> > > > > 
> > > > > Reviewed-by: Eric Biggers <ebiggers@google.com>
> > > > 
> > > > Hi David
> > > > 
> > > > could you please take this patch in your repo, if it is ok?
> > > 
> > > Kindly ask your support here. Has this patch been queued somewhere?
> > > Wasn't able to find it, also it is not in linux-next.
> > > 
> > 
> > The maintainer of asymmetric_keys (David Howells) is ignoring this patch, so
> > you'll need to find someone else to apply it.  Herbert Xu, the maintainer of the
> > crypto subsystem, might be willing to apply it.  Or maybe Jarkko Sakkinen, who
> > is a co-maintainer of the keyrings subsystem (but not asymmetric_keys, for some
> > reason; should that change?).
> 
> I can apply this if no objections?

Hi Jarkko

I wasn't able to reach David about this patch. Could you please apply
it?

Thanks

Roberto