On 8/12/21 2:43 PM, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 1746f4db5135 Merge tag 'orphans-v5.14-rc6' of git://git.ke.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=111065fa300000 > kernel config: https://syzkaller.appspot.com/x/.config?x=e3a20bae04b96ccd > dashboard link: https://syzkaller.appspot.com/bug?extid=9671693590ef5aad8953 > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=119dcaf6300000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=120d216e300000 > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+9671693590ef5aad8953@xxxxxxxxxxxxxxxxxxxxxxxxx #syz test: https://github.com/isilence/linux.git syztest_trunc2 > > ================================================================== > BUG: KASAN: stack-out-of-bounds in iov_iter_revert lib/iov_iter.c:1093 [inline] > BUG: KASAN: stack-out-of-bounds in iov_iter_revert+0x803/0x900 lib/iov_iter.c:1033 > Read of size 8 at addr ffffc9000cf478b0 by task syz-executor673/8439 > > CPU: 0 PID: 8439 Comm: syz-executor673 Not tainted 5.14.0-rc5-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 > Call Trace: > __dump_stack lib/dump_stack.c:88 [inline] > dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:105 > print_address_description.constprop.0.cold+0xf/0x309 mm/kasan/report.c:233 > __kasan_report mm/kasan/report.c:419 [inline] > kasan_report.cold+0x83/0xdf mm/kasan/report.c:436 > iov_iter_revert lib/iov_iter.c:1093 [inline] > iov_iter_revert+0x803/0x900 lib/iov_iter.c:1033 > io_write+0x57b/0xed0 fs/io_uring.c:3459 > io_issue_sqe+0x28c/0x6920 fs/io_uring.c:6181 > __io_queue_sqe+0x1ac/0xf00 fs/io_uring.c:6464 > io_queue_sqe fs/io_uring.c:6507 [inline] > io_submit_sqe fs/io_uring.c:6662 [inline] > io_submit_sqes+0x63ea/0x7bc0 fs/io_uring.c:6778 > __do_sys_io_uring_enter+0xb03/0x1d40 fs/io_uring.c:9389 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x44/0xae > RIP: 0033:0x43f8a9 > Code: 28 c3 e8 1a 15 00 00 66 2e 0f 1f 84 00 00 00 00 00 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 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007ffcc6759968 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa > RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 000000000043f8a9 > RDX: 0000000000000000 RSI: 00000000000052fe RDI: 0000000000000003 > RBP: 00007ffcc6759988 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffcc6759990 > R13: 0000000000000000 R14: 00000000004ae018 R15: 0000000000400488 > > > addr ffffc9000cf478b0 is located in stack of task syz-executor673/8439 at offset 152 in frame: > io_write+0x0/0xed0 fs/io_uring.c:3335 > > this frame has 3 objects: > [48, 56) 'iovec' > [80, 120) '__iter' > [160, 288) 'inline_vecs' > > Memory state around the buggy address: > ffffc9000cf47780: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ffffc9000cf47800: 00 00 00 f1 f1 f1 f1 00 00 00 f2 f2 f2 00 00 00 >> ffffc9000cf47880: 00 00 f2 f2 f2 f2 f2 00 00 00 00 00 00 00 00 00 > ^ > ffffc9000cf47900: 00 00 00 00 00 00 00 f3 f3 f3 f3 00 00 00 00 00 > ffffc9000cf47980: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 > ================================================================== > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > syzbot can test patches for this issue, for details see: > https://goo.gl/tpsmEJ#testing-patches > -- Pavel Begunkov
