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bh=vsDIt2sQ1wdB7WsIaI7KbhF+D9wriEacOBHbOPGjtXM=; b=dq8CzmirZLwyR38Zm6BX5lbpLASR0TxuBCRPbMLOHJ98LNrDUS0rMmFgeIL6PvkR2Gi9Dc Md7TJ1SJmfLUyZW92eE8sDLIVr/lx6u53u8Z6pF7QQhnM0Wx6/m5SkqGQ9fqrqcjqU3aPQ NiTtadBbwDCGsTPbyltzb9wY7kMbVeY= X-MC-Unique: wetBv4WON4-5o-xNdOTuHg-1 From: Thomas Huth To: qemu-devel@nongnu.org, Peter Maydell Subject: [PULL 02/15] qtest/libqtest: fix heap-buffer-overflow in qtest_cb_for_every_machine() Date: Mon, 11 Jan 2021 14:43:15 +0100 Message-Id: <20210111134328.157775-3-thuth@redhat.com> In-Reply-To: <20210111134328.157775-1-thuth@redhat.com> References: <20210111134328.157775-1-thuth@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=thuth@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com 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=thuth@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -29 X-Spam_score: -3.0 X-Spam_bar: --- X-Spam_report: (-3.0 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.251, 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_H3=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: Alexander Bulekov , Warner Losh , Qiuhao Li Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Type: text/plain; charset="utf-8" From: Gan Qixin When the length of mname is less than 5, memcpy("xenfv", mname, 5) will cau= se heap buffer overflow. Therefore, use strncmp to avoid this problem. The asan showed stack: ERROR: AddressSanitizer: heap-buffer-overflow on address 0x60200000f2f4 at pc 0x7f65d8cc2225 bp 0x7ffe93cc5a60 sp 0x7ffe93cc5208 READ of size 5 at 0x60200000f2f4 thread T0 #0 0x7f65d8cc2224 in memcmp (/lib64/libasan.so.5+0xdf224) #1 0x5632c20be95b in qtest_cb_for_every_machine tests/qtest/libqtest.c:= 1282 #2 0x5632c20b7995 in main tests/qtest/test-hmp.c:160 #3 0x7f65d88fed42 in __libc_start_main (/lib64/libc.so.6+0x26d42) #4 0x5632c20b72cd in _start (build/tests/qtest/test-hmp+0x542cd) Reported-by: Euler Robot Signed-off-by: Gan Qixin Reviewed-by: Laurent Vivier Message-Id: <20210106050625.518041-1-ganqixin@huawei.com> Signed-off-by: Thomas Huth --- tests/qtest/libqtest.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tests/qtest/libqtest.c b/tests/qtest/libqtest.c index 8e93b0a707..5249a628cc 100644 --- a/tests/qtest/libqtest.c +++ b/tests/qtest/libqtest.c @@ -1279,7 +1279,7 @@ void qtest_cb_for_every_machine(void (*cb)(const char= *machine), g_assert(qstr); mname =3D qstring_get_str(qstr); /* Ignore machines that cannot be used for qtests */ - if (!memcmp("xenfv", mname, 5) || g_str_equal("xenpv", mname)) { + if (!strncmp("xenfv", mname, 5) || g_str_equal("xenpv", mname)) { continue; } if (!skip_old_versioned || !qtest_is_old_versioned_machine(mname))= { --=20 2.27.0