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Tsirkin" Subject: [PATCH] pci: check address before reading configuration bytes Date: Wed, 3 Jun 2020 18:10:41 +0530 Message-Id: <20200603124041.1137464-1-ppandit@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=207.211.31.81; envelope-from=ppandit@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/03 01:12:11 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Prasad J Pandit , Yi Ren , QEMU Developers , Ren Ding , Hanqing Zhao Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" From: Prasad J Pandit While reading PCI configuration bytes, a guest may send an address towards the end of the configuration space. It may lead to an OOB access issue. Add check to ensure 'address + len' is within PCI configuration space. Reported-by: Ren Ding Reported-by: Hanqing Zhao Reported-by: Yi Ren Signed-off-by: Prasad J Pandit --- hw/pci/pci.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/hw/pci/pci.c b/hw/pci/pci.c index 70c66965f5..4429fa9401 100644 --- a/hw/pci/pci.c +++ b/hw/pci/pci.c @@ -1385,7 +1385,9 @@ uint32_t pci_default_read_config(PCIDevice *d, ranges_overlap(address, len, d->exp.exp_cap + PCI_EXP_LNKSTA, 2)) { pcie_sync_bridge_lnk(d); } - memcpy(&val, d->config + address, len); + if (address + len <=3D pci_config_size(d)) { + memcpy(&val, d->config + address, len); + } return le32_to_cpu(val); } =20 --=20 2.26.2