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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1780386295; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=rk4xTh0gP+rklBvqi2gZogBMA791ra7/2dSlisoSDUI=; b=GyLr4KUlpGHonnqs/Yo6Ec/57EH2KbW+nwLXsf/DtScaWArb4/aXdpVjG7c0KAfE2OEfb0 iu1CpP/NUu7XC0uyNtOLM3ztu8mkY7xoOdjcBKPQgn3zZJf6qicZCCT7q77YAPnbjmbdnC 3d9p7yeO3bKB4BmUlnwmAMVvq3xQ3io= X-MC-Unique: F6w6nQmsPeSs8XkODjWtGw-1 X-Mimecast-MFC-AGG-ID: F6w6nQmsPeSs8XkODjWtGw_1780386290 From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= To: qemu-devel@nongnu.org Cc: Alex Williamson , Mario Casquero , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= Subject: [PATCH] vfio/pci: Fix information leak in vfio_rom_read() Date: Tue, 2 Jun 2026 09:44:46 +0200 Message-ID: <20260602074446.1206892-1-clg@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 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=lists1p.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=clg@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: 8 X-Spam_score: 0.8 X-Spam_bar: / X-Spam_report: (0.8 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.445, 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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_SBL_CSS=3.335, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=no autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development 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 @redhat.com) X-ZM-MESSAGEID: 1780386319831158500 vfio_rom_read() can leak uninitialized stack data to the guest when a read occurs at the end boundary of the ROM BAR. Fix this by initializing the val union to 0xff, matching the ROM initialization pattern used in vfio_pci_load_rom(). Signed-off-by: C=C3=A9dric Le Goater Reviewed-by: Mario Casquero Reviewed-by: Philippe Mathieu-Daud=C3=A9 --- hw/vfio/pci.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/hw/vfio/pci.c b/hw/vfio/pci.c index 9df04fa2d76b1a78ee884d915f5a0c3c5fdb6115..de28e72519326741295c19f4a07= 208b95861f2ce 100644 --- a/hw/vfio/pci.c +++ b/hw/vfio/pci.c @@ -1142,7 +1142,7 @@ static uint64_t vfio_rom_read(void *opaque, hwaddr ad= dr, unsigned size) uint16_t word; uint32_t dword; uint64_t qword; - } val; + } val =3D { .qword =3D ~0ULL }; uint64_t data =3D 0; =20 /* Load the ROM lazily when the guest tries to read it */ --=20 2.54.0