Message ID | 20210903174510.751630-11-philmd@redhat.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show
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[83.52.55.21]) by smtp.gmail.com with ESMTPSA id z2sm17928wma.45.2021.09.03.10.46.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Sep 2021 10:46:05 -0700 (PDT) From: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= <philmd@redhat.com> To: qemu-devel@nongnu.org Subject: [PATCH v3 10/28] hw/core/machine: Replace g_memdup() by g_memdup2() Date: Fri, 3 Sep 2021 19:44:52 +0200 Message-Id: <20210903174510.751630-11-philmd@redhat.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210903174510.751630-1-philmd@redhat.com> References: <20210903174510.751630-1-philmd@redhat.com> MIME-Version: 1.0 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=philmd@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=170.10.133.124; envelope-from=philmd@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -31 X-Spam_score: -3.2 X-Spam_bar: --- X-Spam_report: (-3.2 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.392, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: <qemu-devel.nongnu.org> List-Unsubscribe: <https://lists.nongnu.org/mailman/options/qemu-devel>, <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe> List-Archive: <https://lists.nongnu.org/archive/html/qemu-devel> List-Post: <mailto:qemu-devel@nongnu.org> List-Help: <mailto:qemu-devel-request@nongnu.org?subject=help> List-Subscribe: <https://lists.nongnu.org/mailman/listinfo/qemu-devel>, <mailto:qemu-devel-request@nongnu.org?subject=subscribe> Cc: Peter Maydell <peter.maydell@linaro.org>, "Michael S. Tsirkin" <mst@redhat.com>, Jason Wang <jasowang@redhat.com>, Christian Schoenebeck <qemu_oss@crudebyte.com>, Gerd Hoffmann <kraxel@redhat.com>, Eric Blake <eblake@redhat.com>, qemu-block@nongnu.org, =?utf-8?q?Alex_Benn=C3=A9e?= <alex.bennee@linaro.org>, David Hildenbrand <david@redhat.com>, Markus Armbruster <armbru@redhat.com>, =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= <philmd@redhat.com>, Laurent Vivier <lvivier@redhat.com>, Thomas Huth <thuth@redhat.com>, Eduardo Habkost <ehabkost@redhat.com>, Richard Henderson <richard.henderson@linaro.org>, qemu-arm@nongnu.org, John Snow <jsnow@redhat.com>, David Gibson <david@gibson.dropbear.id.au>, Kevin Wolf <kwolf@redhat.com>, Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>, "Daniel P . Berrange" <berrange@redhat.com>, Hanna Reitz <hreitz@redhat.com>, qemu-ppc@nongnu.org, Paolo Bonzini <pbonzini@redhat.com> Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" <qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org> |
Series |
[v3,01/28] hw/hyperv/vmbus: Remove unused vmbus_load/save_req()
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expand
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diff --git a/hw/core/machine.c b/hw/core/machine.c index 067f42b528f..c3e5371b177 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -615,8 +615,8 @@ HotpluggableCPUList *machine_query_hotpluggable_cpus(MachineState *machine) cpu_item->type = g_strdup(machine->possible_cpus->cpus[i].type); cpu_item->vcpus_count = machine->possible_cpus->cpus[i].vcpus_count; - cpu_item->props = g_memdup(&machine->possible_cpus->cpus[i].props, - sizeof(*cpu_item->props)); + cpu_item->props = g_memdup2(&machine->possible_cpus->cpus[i].props, + sizeof(*cpu_item->props)); cpu = machine->possible_cpus->cpus[i].cpu; if (cpu) {
Per https://discourse.gnome.org/t/port-your-module-from-g-memdup-to-g-memdup2-now/5538 The old API took the size of the memory to duplicate as a guint, whereas most memory functions take memory sizes as a gsize. This made it easy to accidentally pass a gsize to g_memdup(). For large values, that would lead to a silent truncation of the size from 64 to 32 bits, and result in a heap area being returned which is significantly smaller than what the caller expects. This can likely be exploited in various modules to cause a heap buffer overflow. Replace g_memdup() by the safer g_memdup2() wrapper. Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> --- hw/core/machine.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)