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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: AF_UNIX crash in bind() triggered by strace test Date: Thu, 20 Jul 2023 13:00:23 +0200 Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: E1cK2fdn4YFSv0Evtt5uph5Qj5By2Ykb X-Proofpoint-ORIG-GUID: I-vwR6ADdYzu6bsgRFPvuNbcMH0mvNAZ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-07-20_04,2023-07-20_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 bulkscore=0 phishscore=0 mlxlogscore=967 suspectscore=0 impostorscore=0 adultscore=0 spamscore=0 lowpriorityscore=0 mlxscore=0 priorityscore=1501 clxscore=1011 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2306200000 definitions=main-2307200088 X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_H5, RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1771938122930026412 X-GMAIL-MSGID: 1771938122930026412 Hi, the following crash was reported in our CI on s390x with debug_defconfig, which enables FORTIFY_SOURCE: detected buffer overflow in __fortify_strlen ------------[ cut here ]------------ kernel BUG at lib/string_helpers.c:1031! monitor event: 0040 ilc:2 [#1] PREEMPT SMP Modules linked in: [..] CPU: 0 PID: 243755 Comm: net-accept-conn Not tainted 6.5.0-20230719.rc2.git1.f1311c9e1695.300.fc38.s390x+debug #1 Call Trace: [<000000003465b7a2>] fortify_panic+0x2a/0x30 ([<000000003465b79e>] fortify_panic+0x26/0x30) [<0000000034a3a77e>] unix_bind_bsd+0x86/0x390 [<00000000348839d0>] __sys_bind+0xe0/0xe8 [<0000000034926270>] __do_compat_sys_socketcall+0x260/0x4d0 [<0000000034be3b66>] __do_syscall+0x1de/0x208 [<0000000034bfaf38>] system_call+0x70/0x98 INFO: lockdep is turned off. Last Breaking-Event-Address: [<0000000034774880>] __s390_indirect_jump_r14+0x0/0x10 Kernel panic - not syncing: Fatal exception: panic_on_oops This is caused by a test case who sends an unterminated sun_path to the kernel in a bind() system call from the strace test suite. As a test i made the following quick fix, which "fixed" the issue: However, unix(7) says "The pathname in sun_path *should* be null-terminated." So this change might break userspace. I'm not sure whether we should return -EINVAL, or just truncate the name to UNIX_PATH_MAX. From a quick read, it looks like connect() would trigger the same problem. Any thoughts? diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index 123b35ddfd71..c505edd74d8c 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -1206,11 +1206,13 @@ static int unix_bind_bsd(struct sock *sk, struct sockaddr_un *sunaddr, struct unix_address *addr; struct dentry *dentry; struct path parent; - int err; + int pathlen, err; unix_mkname_bsd(sunaddr, addr_len); - addr_len = strlen(sunaddr->sun_path) + - offsetof(struct sockaddr_un, sun_path) + 1; + pathlen = strnlen(sunaddr->sun_path, UNIX_PATH_MAX); + if (pathlen == UNIX_PATH_MAX) + return -EINVAL; + addr_len = pathlen + offsetof(struct sockaddr_un, sun_path) + 1; addr = unix_create_addr(sunaddr, addr_len); if (!addr)