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Tue, 13 Feb 2024 21:14:10 -0800 (PST) X-Forwarded-Encrypted: i=1; AJvYcCUIakWlVCQZYSpZlMrbN9Q+n9UrKcVpXJeJdP1ZmR5Kqab4FY/qOVy7JwM7pgUEmo3m/uRfq8L9Pt4Y5rCXYNgs5D4AoKOyc7ZGBMO4S6b1q0vE/7S/Td6nCk3GQvx6+W/oXGL47ZOtHBd/1ikin8GwCrKu07jrsTeHnHBwaj+vxp3VHeEblZjtRwYGX5e7xCRaAljNUtEz5M1u0jIrH9+C8cJ/rmyD68vkd+h6gVBSfa4UWNGznneT7rF2b7GHyAiegHSlgu7zghpGZ3Q37TkDxHF53dh8zmMdAF5eHjoGlhbkOWsGP28o9Y88mhz7bPVKF2WZBwYQbB46JlorgWlay6Tg/y8vgZ1bNhMI9//hSQYFee2rYJOe0Y7bLo3M5nWPiJt22tDWzbC1/9bFdAzhNyi6DSCXJiTAak+hdjVKDNKyPvO+234Pu4oT4tI= From: Akihiko Odaki Date: Wed, 14 Feb 2024 14:13:43 +0900 Subject: [PATCH v4 5/9] pcie_sriov: Validate NumVFs MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20240214-reuse-v4-5-89ad093a07f4@daynix.com> References: <20240214-reuse-v4-0-89ad093a07f4@daynix.com> In-Reply-To: <20240214-reuse-v4-0-89ad093a07f4@daynix.com> To: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= , "Michael S. Tsirkin" , Marcel Apfelbaum , Alex Williamson , =?utf-8?q?C=C3=A9dric_Le_Goater?= , Paolo Bonzini , =?utf-8?q?Daniel_P=2E_Berrang=C3=A9?= , Eduardo Habkost , Sriram Yagnaraman , Jason Wang , Keith Busch , Klaus Jensen Cc: qemu-devel@nongnu.org, qemu-block@nongnu.org, Akihiko Odaki X-Mailer: b4 0.12.3 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: none client-ip=2607:f8b0:4864:20::234; envelope-from=akihiko.odaki@daynix.com; helo=mail-oi1-x234.google.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_NONE=0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @daynix-com.20230601.gappssmtp.com) X-ZM-MESSAGEID: 1707887770208100007 The guest may write NumVFs greater than TotalVFs and that can lead to buffer overflow in VF implementations. Fixes: 7c0fa8dff811 ("pcie: Add support for Single Root I/O Virtualization = (SR/IOV)") Signed-off-by: Akihiko Odaki --- hw/pci/pcie_sriov.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/hw/pci/pcie_sriov.c b/hw/pci/pcie_sriov.c index a1fe65f5d801..da209b7f47fd 100644 --- a/hw/pci/pcie_sriov.c +++ b/hw/pci/pcie_sriov.c @@ -176,6 +176,9 @@ static void register_vfs(PCIDevice *dev) =20 assert(sriov_cap > 0); num_vfs =3D pci_get_word(dev->config + sriov_cap + PCI_SRIOV_NUM_VF); + if (num_vfs > pci_get_word(dev->config + sriov_cap + PCI_SRIOV_TOTAL_V= F)) { + return; + } =20 dev->exp.sriov_pf.vf =3D g_new(PCIDevice *, num_vfs); =20 --=20 2.43.0