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bh=wnGuZPx+UAaBEgkFnO6bEawv0Wo31ZzE5F202qNrgbc=; b=Gx9Nrx3IhTwjhgWCwKTUTjeHQdjucQOXQnLXxWVQm/jWAPQORB0lj3Q3fOnC7zW+DqMlgy TeAqmuawmHs1UhhR4rfLMK9lQESdyRJ/0HNYgwNvHtFBC00xwF9P8VW4Cy6vyLo8TaX4WI pNTxKHJKGb5M1Ey3UUXdZrSHi6UUkuE= X-MC-Unique: rbyClE7FOp2yzmKaXVCWLQ-1 From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PULL 19/92] hw/char/serial: Assert serial_ioport_read/write offset fits 8 bytes Date: Thu, 24 Sep 2020 05:22:01 -0400 Message-Id: <20200924092314.1722645-20-pbonzini@redhat.com> In-Reply-To: <20200924092314.1722645-1-pbonzini@redhat.com> References: <20200924092314.1722645-1-pbonzini@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=pbonzini@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 (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=216.205.24.124; envelope-from=pbonzini@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/22 23:02:20 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -32 X-Spam_score: -3.3 X-Spam_bar: --- X-Spam_report: (-3.3 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.228, 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_H5=0.001, RCVD_IN_MSPIKE_WL=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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Richard Henderson , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) From: Philippe Mathieu-Daud=C3=A9 The serial device has 8 registers, each 8-bit. The MemoryRegionOps 'serial_io_ops' is initialized with max_access_size=3D1, and all memory_region_init_io() callers correctly set the region size to 8 bytes: - serial_io_realize - serial_isa_realizefn - serial_pci_realize - multi_serial_pci_realize It is safe to assert the offset argument of serial_ioport_read() and serial_ioport_write() is always less than 8. Signed-off-by: Philippe Mathieu-Daud=C3=A9 Reviewed-by: Richard Henderson Message-Id: <20200907015535.827885-2-f4bug@amsat.org> Signed-off-by: Paolo Bonzini --- hw/char/serial.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/hw/char/serial.c b/hw/char/serial.c index fd80ae5592..840da89de7 100644 --- a/hw/char/serial.c +++ b/hw/char/serial.c @@ -344,7 +344,7 @@ static void serial_ioport_write(void *opaque, hwaddr ad= dr, uint64_t val, { SerialState *s =3D opaque; =20 - addr &=3D 7; + assert(size =3D=3D 1 && addr < 8); trace_serial_ioport_write(addr, val); switch(addr) { default: @@ -485,7 +485,7 @@ static uint64_t serial_ioport_read(void *opaque, hwaddr= addr, unsigned size) SerialState *s =3D opaque; uint32_t ret; =20 - addr &=3D 7; + assert(size =3D=3D 1 && addr < 8); switch(addr) { default: case 0: --=20 2.26.2