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[79.177.155.162]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4666678828dsm13793325f8f.19.2026.06.20.22.33.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 20 Jun 2026 22:33:18 -0700 (PDT) Date: Sun, 21 Jun 2026 01:33:16 -0400 From: "Michael S. Tsirkin" To: hexlabsecurity@proton.me Cc: Herbert Xu , Jason Wang , Gonglei , virtualization@lists.linux.dev, Xuan Zhuo , linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, Eugenio =?iso-8859-1?Q?P=E9rez?= , "David S. Miller" Subject: Re: [PATCH] crypto: virtio - bound the device-reported akcipher result Message-ID: <20260621013215-mutt-send-email-mst@kernel.org> References: <20260620-b4-disp-27caeeac-v1-1-956e8f9c4f01@proton.me> Precedence: bulk X-Mailing-List: linux-crypto@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260620-b4-disp-27caeeac-v1-1-956e8f9c4f01@proton.me> On Sat, Jun 20, 2026 at 09:44:21PM -0500, Bryam Vargas via B4 Relay wrote: > From: Bryam Vargas > > length some kind of corruption here. > virtio_crypto_dataq_akcipher_callback() sets the result length from the > device-reported response length without bounding it to the destination > buffer, which was allocated for the original request length. > sg_copy_from_buffer() then reads that many bytes from the destination > buffer; a backend reporting a larger length over-reads adjacent kernel > heap into the caller's scatterlist (an out-of-bounds read). > > Clamp the reported length to the originally requested destination length. > A conforming device reports no more than that, so valid results are > unaffected. > > Fixes: a36bd0ad9fbf ("virtio-crypto: adjust dst_len at ops callback") > Cc: stable@vger.kernel.org > Signed-off-by: Bryam Vargas > --- > drivers/crypto/virtio/virtio_crypto_akcipher_algs.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c > index d8d452cac391..64ea141f018c 100644 > --- a/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c > +++ b/drivers/crypto/virtio/virtio_crypto_akcipher_algs.c > @@ -88,7 +88,8 @@ static void virtio_crypto_dataq_akcipher_callback(struct virtio_crypto_request * > } > > /* actual length may be less than dst buffer */ > - akcipher_req->dst_len = len - sizeof(vc_req->status); > + akcipher_req->dst_len = min_t(unsigned int, len - sizeof(vc_req->status), > + akcipher_req->dst_len); > sg_copy_from_buffer(akcipher_req->dst, sg_nents(akcipher_req->dst), > vc_akcipher_req->dst_buf, akcipher_req->dst_len); > virtio_crypto_akcipher_finalize_req(vc_akcipher_req, akcipher_req, error); > > --- > base-commit: 1a3746ccbb0a97bed3c06ccde6b880013b1dddc1 > change-id: 20260620-b4-disp-27caeeac-5b8b67962fdd > > Best regards, > -- > Bryam Vargas >