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[83.52.55.21]) by smtp.gmail.com with ESMTPSA id v5sm5111506wrw.44.2021.09.03.10.45.10 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 03 Sep 2021 10:45:12 -0700 (PDT) From: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org Subject: [PATCH v3 00/28] glib: Replace g_memdup() by g_memdup2() Date: Fri, 3 Sep 2021 19:44:42 +0200 Message-Id: <20210903174510.751630-1-philmd@redhat.com> X-Mailer: git-send-email 2.31.1 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: quoted-printable Received-SPF: pass client-ip=216.205.24.124; envelope-from=philmd@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -12 X-Spam_score: -1.3 X-Spam_bar: - X-Spam_report: (-1.3 / 5.0 requ) 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=unavailable autolearn_force=no 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: Peter Maydell , "Michael S. Tsirkin" , Jason Wang , Christian Schoenebeck , Gerd Hoffmann , Eric Blake , qemu-block@nongnu.org, =?UTF-8?q?Alex=20Benn=C3=A9e?= , David Hildenbrand , Markus Armbruster , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Laurent Vivier , Thomas Huth , Eduardo Habkost , Richard Henderson , qemu-arm@nongnu.org, John Snow , David Gibson , Kevin Wolf , Vladimir Sementsov-Ogievskiy , "Daniel P . Berrange" , Hanna Reitz , qemu-ppc@nongnu.org, Paolo Bonzini Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Per https://discourse.gnome.org/t/port-your-module-from-g-memdup-to-g-memdu= p2-now/5538=0D =0D The old API took the size of the memory to duplicate as a guint,=0D whereas most memory functions take memory sizes as a gsize. This=0D made it easy to accidentally pass a gsize to g_memdup(). For large=0D values, that would lead to a silent truncation of the size from 64=0D to 32 bits, and result in a heap area being returned which is=0D significantly smaller than what the caller expects. This can likely=0D be exploited in various modules to cause a heap buffer overflow.=0D =0D g_memdup() as been deprecated in GLib 2.68. Since QEMU defines=0D GLIB_VERSION_MAX_ALLOWED to GLIB_VERSION_2_56, the deprecation=0D is not displayed (on GLib >=3D 2.68 such available on Fedora 34).=0D However the function is still unsafe, so it is better to avoid=0D its use.=0D =0D This series provides the safely equivalent g_memdup2() wrapper,=0D and replace all g_memdup() calls by it.=0D =0D The previous link recommend to audit the call sites. Most of the=0D calls use byte_size=3Dsizeof(STRUCT), and no STRUCT appears to be=0D > 4GiB. Few calls use unsigned/size_t/uint16_t. Where code is=0D doing multiplication, patches are sent as RFC. In particular:=0D hw/net/virtio-net.c=0D hw/virtio/virtio-crypto.c=0D =0D Since v1:=0D - Added missing g_memdup2 -> g_memdup2_qemu compat definition (danpb)=0D - Do not call g_memdup2_qemu() but directly g_memdup2() (danpb)=0D =0D Tested with the following snippet:=0D -- >8 --=0D diff --git a/include/glib-compat.h b/include/glib-compat.h=0D index 8d01a8c01fb..2b33dea71a8 100644=0D --- a/include/glib-compat.h=0D +++ b/include/glib-compat.h=0D @@ -21,3 +21,3 @@=0D */=0D -#define GLIB_VERSION_MIN_REQUIRED GLIB_VERSION_2_56=0D +#define GLIB_VERSION_MIN_REQUIRED GLIB_VERSION_2_68=0D =0D @@ -26,3 +26,3 @@=0D */=0D -#define GLIB_VERSION_MAX_ALLOWED GLIB_VERSION_2_56=0D +#define GLIB_VERSION_MAX_ALLOWED GLIB_VERSION_2_68=0D =0D ---=0D =0D Philippe Mathieu-Daud=C3=A9 (28):=0D hw/hyperv/vmbus: Remove unused vmbus_load/save_req()=0D glib-compat: Introduce g_memdup2() wrapper=0D qapi: Replace g_memdup() by g_memdup2()=0D accel/tcg: Replace g_memdup() by g_memdup2()=0D block/qcow2-bitmap: Replace g_memdup() by g_memdup2()=0D softmmu: Replace g_memdup() by g_memdup2()=0D hw/9pfs: Replace g_memdup() by g_memdup2()=0D hw/acpi: Avoid truncating acpi_data_len() to 32-bit=0D hw/acpi: Replace g_memdup() by g_memdup2()=0D hw/core/machine: Replace g_memdup() by g_memdup2()=0D hw/hppa/machine: Replace g_memdup() by g_memdup2()=0D hw/i386/multiboot: Replace g_memdup() by g_memdup2()=0D hw/net/eepro100: Replace g_memdup() by g_memdup2()=0D hw/nvram/fw_cfg: Replace g_memdup() by g_memdup2()=0D hw/scsi/mptsas: Replace g_memdup() by g_memdup2()=0D hw/ppc/spapr_pci: Replace g_memdup() by g_memdup2()=0D hw/rdma: Replace g_memdup() by g_memdup2()=0D hw/vfio/pci: Replace g_memdup() by g_memdup2()=0D hw/virtio: Replace g_memdup() by g_memdup2()=0D net/colo: Replace g_memdup() by g_memdup2()=0D ui/clipboard: Replace g_memdup() by g_memdup2()=0D linux-user: Replace g_memdup() by g_memdup2()=0D tests/unit: Replace g_memdup() by g_memdup2()=0D tests/qtest: Replace g_memdup() by g_memdup2()=0D target/arm: Replace g_memdup() by g_memdup2()=0D target/ppc: Replace g_memdup() by g_memdup2()=0D contrib: Replace g_memdup() by g_memdup2()=0D checkpatch: Do not allow deprecated g_memdup()=0D =0D include/glib-compat.h | 37 +++++++++++++++++++++++=0D include/hw/hyperv/vmbus.h | 3 --=0D accel/tcg/cputlb.c | 8 ++---=0D block/qcow2-bitmap.c | 2 +-=0D contrib/plugins/lockstep.c | 2 +-=0D contrib/rdmacm-mux/main.c | 10 +++----=0D hw/9pfs/9p-synth.c | 2 +-=0D hw/9pfs/9p.c | 2 +-=0D hw/acpi/core.c | 3 +-=0D hw/arm/virt-acpi-build.c | 2 +-=0D hw/core/machine.c | 4 +--=0D hw/hppa/machine.c | 8 ++---=0D hw/hyperv/vmbus.c | 59 -------------------------------------=0D hw/i386/acpi-build.c | 6 ++--=0D hw/i386/multiboot.c | 2 +-=0D hw/net/eepro100.c | 2 +-=0D hw/net/virtio-net.c | 3 +-=0D hw/nvram/fw_cfg.c | 9 +++---=0D hw/ppc/spapr_pci.c | 7 ++---=0D hw/rdma/rdma_utils.c | 2 +-=0D hw/scsi/mptsas.c | 5 ++--=0D hw/vfio/pci.c | 2 +-=0D hw/virtio/virtio-crypto.c | 6 ++--=0D linux-user/syscall.c | 2 +-=0D linux-user/uaccess.c | 2 +-=0D net/colo.c | 4 +--=0D qapi/qapi-clone-visitor.c | 16 +++++-----=0D qapi/qapi-visit-core.c | 6 ++--=0D softmmu/memory.c | 2 +-=0D softmmu/vl.c | 2 +-=0D target/arm/helper.c | 6 ++--=0D target/ppc/mmu-hash64.c | 2 +-=0D tests/qtest/libqos/ahci.c | 6 ++--=0D tests/qtest/libqos/qgraph.c | 2 +-=0D tests/unit/ptimer-test.c | 22 +++++++-------=0D tests/unit/test-iov.c | 26 ++++++++--------=0D ui/clipboard.c | 2 +-=0D scripts/checkpatch.pl | 5 ++++=0D 38 files changed, 138 insertions(+), 153 deletions(-)=0D =0D --=20=0D 2.31.1=0D =0D