Begin forwarded message: Date: Fri, 22 Jun 2018 15:09:48 +0000 From: bugzilla-daemon@xxxxxxxxxxxxxxxxxxx To: stephen@xxxxxxxxxxxxxxxxxx Subject: [Bug 200187] New: UBSAN: Undefined behaviour in net/sunrpc/xprt.c:568 https://bugzilla.kernel.org/show_bug.cgi?id=200187 Bug ID: 200187 Summary: UBSAN: Undefined behaviour in net/sunrpc/xprt.c:568 Product: Networking Version: 2.5 Kernel Version: v4.18-rc2 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Other Assignee: stephen@xxxxxxxxxxxxxxxxxx Reporter: icytxw@xxxxxxxxx Regression: No It seems like that to->to_retries to large while shift exponent. if (to->to_exponential) req->rq_majortimeo <<= to->to_retries; else ================================================================================ UBSAN: Undefined behaviour in net/sunrpc/xprt.c:568:22 shift exponent 536870976 is too large for 64-bit type 'long unsigned int' CPU: 0 PID: 21219 Comm: syz-executor1 Not tainted 4.18.0-rc1 #2 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.10.2-0-g5f4c7b1-prebuilt.qemu-project.org 04/01/2014 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x122/0x1c8 lib/dump_stack.c:113 ubsan_epilogue+0x12/0x86 lib/ubsan.c:159 __ubsan_handle_shift_out_of_bounds+0x29a/0x2ff lib/ubsan.c:425 xprt_reset_majortimeo+0x323/0x440 net/sunrpc/xprt.c:568 xprt_request_init+0x4d2/0x730 net/sunrpc/xprt.c:1330 call_reserveresult+0x9d/0x240 net/sunrpc/clnt.c:1549 __rpc_execute+0x23a/0xc20 net/sunrpc/sched.c:784 rpc_execute+0xf5/0x250 net/sunrpc/sched.c:852 rpc_run_task+0x4a1/0x9f0 net/sunrpc/clnt.c:1053 rpc_call_sync+0xcf/0x1a0 net/sunrpc/clnt.c:1082 rpc_ping+0xde/0x140 net/sunrpc/clnt.c:2514 rpc_create_xprt+0x1e8/0x590 net/sunrpc/clnt.c:479 rpc_create+0x3a9/0x600 net/sunrpc/clnt.c:587 nfs_create_rpc_client+0x3a1/0x4d0 fs/nfs/client.c:523 nfs_init_client+0x7b/0x100 fs/nfs/client.c:634 nfs_get_client+0xa74/0x1440 fs/nfs/client.c:425 nfs_init_server+0x236/0xdf0 fs/nfs/client.c:670 nfs_create_server+0x9a/0x750 fs/nfs/client.c:953 nfs_try_mount+0x270/0xaf0 fs/nfs/super.c:1884 nfs_fs_mount+0x151f/0x30e0 fs/nfs/super.c:2695 mount_fs+0xaf/0x330 fs/super.c:1277 vfs_kern_mount+0xfc/0x4d0 fs/namespace.c:1037 do_new_mount fs/namespace.c:2518 [inline] do_mount+0x46f/0x2fa0 fs/namespace.c:2848 ksys_mount+0xb0/0x120 fs/namespace.c:3064 __do_sys_mount fs/namespace.c:3078 [inline] __se_sys_mount fs/namespace.c:3075 [inline] __x64_sys_mount+0xcc/0x170 fs/namespace.c:3075 do_syscall_64+0xb8/0x3a0 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455a09 Code: 1d ba fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 eb b9 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f11c724ac68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f11c724b6d4 RCX: 0000000000455a09 RDX: 00000000200001c0 RSI: 0000000020000100 RDI: 0000000020000200 RBP: 000000000072bea0 R08: 0000000020000180 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff R13: 00000000000004d1 R14: 00000000006fc438 R15: 0000000000000000 ================================================================================ rpcbind: RPC call returned error 22 rpcbind: RPC call returned error 22 rpcbind: RPC call returned error 22 rpcbind: RPC call returned error 22 rpcbind: RPC call returned error 22 FAT-fs (loop1): bogus number of reserved sectors FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus number of reserved sectors FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus number of reserved sectors FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus number of reserved sectors FAT-fs (loop1): Can't find a valid FAT filesystem FAT-fs (loop1): bogus number of reserved sectors FAT-fs (loop1): Can't find a valid FAT filesystem EXT4-fs (sda): re-mounted. Opts: EXT4-fs (sda): re-mounted. Opts: EXT4-fs (sda): re-mounted. Opts: EXT4-fs (sda): re-mounted. Opts: EXT4-fs (sda): re-mounted. Opts: -- You are receiving this mail because: You are the assignee for the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
