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Sun, 26 Jul 2026 17:21:56 +0000 (GMT) Received: from tuxmaker.boeblingen.de.ibm.com (unknown [9.87.85.9]) by smtpav02.fra02v.mail.ibm.com (Postfix) with SMTP; Sun, 26 Jul 2026 17:21:56 +0000 (GMT) Received: by tuxmaker.boeblingen.de.ibm.com (Postfix, from userid 4958) id 8A22D1611ED; Sun, 26 Jul 2026 19:21:56 +0200 (CEST) From: Eric Farman To: linux-s390@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Matthew Rosato , Halil Pasic , Christian Borntraeger , Eric Farman , stable@vger.kernel.org, Cornelia Huck Subject: [PATCH v6 06/10] s390/vfio_ccw: ensure index for read/write regions are within range Date: Sun, 26 Jul 2026 19:21:49 +0200 Message-ID: <20260726172153.1818056-7-farman@linux.ibm.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260726172153.1818056-1-farman@linux.ibm.com> References: <20260726172153.1818056-1-farman@linux.ibm.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzI2MDE3NSBTYWx0ZWRfX+FaXXXdCoiTS UF+rL9RZ2B8dKmh2aIx6j5uFWqIIW8tGX7Uo+/cx2G70Hxkd+daW7o/wPvwS7vqVZ0eSe/yD3Uk C7OE2GznA24v2xBsBXzjzcXd2b62i7U= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzI2MDE3NSBTYWx0ZWRfX/Nzk2BsXIPKU cXWjBEBef3pF+OR6+lvNgbwf+9FvRA2MpxH0wmOt0tgRgdDGtEFpNuvSDs6O1UsmojCJBhk5jLC g8WhIhGU8CtMbjg6jiLFVwljaiAecO5RhrtOWRxqPCsqlELS0uH6XP50AftRrVoJ8HcRbkyHP0X vaMXB/2ppCx1umfmeeM9s6hZH7h52/tdY5o3VFE30KWMj1aGqpDsgEkz4KB8ojQjbfDpPPffWeB 9iFUtdNZEyAze2gp4ZpGTxD675FjyTZQ8//QhdOicsxBDyJe6KBaOTYIdWbOhBfi5t4NzQXqDTv qLisqhZDUYy/Vk7DDcA9vqayQnJwSmwY4fxBBEQ0sHEkVrYnkvz07fJQV2oZN96wTv/FheXxq5j /eKPtc662DoTEIV0OJ67DU0OHlBbB0trOtqhKsDzA0rdQB3a3YyW0avuj2KyyXDd9wwbR1PIIta EhkNlX9EAChgLcPPNAQ== X-Authority-Analysis: v=2.4 cv=b5WCJNGx c=1 sm=1 tr=0 ts=6a664239 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VwQbUJbxAAAA:8 a=20KFwNOVAAAA:8 a=VnNF1IyMAAAA:8 a=jUipGm6kB3s0BbMcHoAA:9 X-Proofpoint-GUID: VRGZQKEIGIuGh3PsLub1XQU2X3wZnimj X-Proofpoint-ORIG-GUID: VRGZQKEIGIuGh3PsLub1XQU2X3wZnimj X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-26_05,2026-07-24_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 spamscore=0 adultscore=0 malwarescore=0 impostorscore=0 bulkscore=0 phishscore=0 suspectscore=0 clxscore=1015 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607260175 The introduction of the capability chain rightly clamped the region indexes to the range of the capabilities itself, but neglected to do so for the existing read/write regions which should also be enforced. Fixes: db8e5d17ac03 ("vfio-ccw: add capabilities chain") Cc: stable@vger.kernel.org Cc: Cornelia Huck Reviewed-by: Matthew Rosato Signed-off-by: Eric Farman --- drivers/s390/cio/vfio_ccw_async.c | 16 ++++++++++++++++ drivers/s390/cio/vfio_ccw_chp.c | 15 +++++++++++++++ drivers/s390/cio/vfio_ccw_ops.c | 7 +++---- 3 files changed, 34 insertions(+), 4 deletions(-) diff --git a/drivers/s390/cio/vfio_ccw_async.c b/drivers/s390/cio/vfio_cc= w_async.c index 420d89ba7f83..4aff0b58fa5d 100644 --- a/drivers/s390/cio/vfio_ccw_async.c +++ b/drivers/s390/cio/vfio_ccw_async.c @@ -8,6 +8,7 @@ */ =20 #include +#include =20 #include "vfio_ccw_private.h" =20 @@ -24,11 +25,20 @@ static ssize_t vfio_ccw_async_region_read(struct vfio= _ccw_private *private, return -EINVAL; =20 mutex_lock(&private->io_mutex); + + if (i >=3D private->num_regions) { + ret =3D -EINVAL; + goto out_unlock; + } + + i =3D array_index_nospec(i, private->num_regions); region =3D private->region[i].data; if (copy_to_user(buf, (void *)region + pos, count)) ret =3D -EFAULT; else ret =3D count; + +out_unlock: mutex_unlock(&private->io_mutex); return ret; } @@ -48,6 +58,12 @@ static ssize_t vfio_ccw_async_region_write(struct vfio= _ccw_private *private, if (!mutex_trylock(&private->io_mutex)) return -EAGAIN; =20 + if (i >=3D private->num_regions) { + ret =3D -EINVAL; + goto out_unlock; + } + + i =3D array_index_nospec(i, private->num_regions); region =3D private->region[i].data; if (copy_from_user((void *)region + pos, buf, count)) { ret =3D -EFAULT; diff --git a/drivers/s390/cio/vfio_ccw_chp.c b/drivers/s390/cio/vfio_ccw_= chp.c index 38c176cf6295..f3015132d4b5 100644 --- a/drivers/s390/cio/vfio_ccw_chp.c +++ b/drivers/s390/cio/vfio_ccw_chp.c @@ -9,6 +9,7 @@ */ =20 #include +#include #include #include "vfio_ccw_private.h" =20 @@ -26,6 +27,13 @@ static ssize_t vfio_ccw_schib_region_read(struct vfio_= ccw_private *private, return -EINVAL; =20 mutex_lock(&private->io_mutex); + + if (i >=3D private->num_regions) { + ret =3D -EINVAL; + goto out; + } + + i =3D array_index_nospec(i, private->num_regions); region =3D private->region[i].data; =20 if (cio_update_schib(sch)) { @@ -97,6 +105,12 @@ static ssize_t vfio_ccw_crw_region_read(struct vfio_c= cw_private *private, list_del(&crw->next); =20 mutex_lock(&private->io_mutex); + if (i >=3D private->num_regions) { + ret =3D -EINVAL; + goto out; + } + + i =3D array_index_nospec(i, private->num_regions); region =3D private->region[i].data; =20 if (crw) @@ -109,6 +123,7 @@ static ssize_t vfio_ccw_crw_region_read(struct vfio_c= cw_private *private, =20 region->crw =3D 0; =20 +out: mutex_unlock(&private->io_mutex); =20 kfree(crw); diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_= ops.c index 45ec722d25ea..032a1cdf4df7 100644 --- a/drivers/s390/cio/vfio_ccw_ops.c +++ b/drivers/s390/cio/vfio_ccw_ops.c @@ -243,6 +243,7 @@ static ssize_t vfio_ccw_mdev_read(struct vfio_device = *vdev, return vfio_ccw_mdev_read_io_region(private, buf, count, ppos); default: index -=3D VFIO_CCW_NUM_REGIONS; + index =3D array_index_nospec(index, private->num_regions); return private->region[index].ops->read(private, buf, count, ppos); } @@ -295,6 +296,7 @@ static ssize_t vfio_ccw_mdev_write(struct vfio_device= *vdev, return vfio_ccw_mdev_write_io_region(private, buf, count, ppos); default: index -=3D VFIO_CCW_NUM_REGIONS; + index =3D array_index_nospec(index, private->num_regions); return private->region[index].ops->write(private, buf, count, ppos); } @@ -338,11 +340,8 @@ static int vfio_ccw_mdev_ioctl_get_region_info(struc= t vfio_device *vdev, VFIO_CCW_NUM_REGIONS + private->num_regions) return -EINVAL; =20 - info->index =3D array_index_nospec(info->index, - VFIO_CCW_NUM_REGIONS + - private->num_regions); - i =3D info->index - VFIO_CCW_NUM_REGIONS; + i =3D array_index_nospec(i, private->num_regions); =20 info->offset =3D VFIO_CCW_INDEX_TO_OFFSET(info->index); info->size =3D private->region[i].size; --=20 2.53.0