On Tue, Jul 11, 2023 at 6:32 AM syzbot <syzbot+b592c1f562f0da80ce2c@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 123212f53f3e Add linux-next specific files for 20230707 > git tree: linux-next > console+strace: https://syzkaller.appspot.com/x/log.txt?x=12353b44a80000 > kernel config: https://syzkaller.appspot.com/x/.config?x=15ec80b62f588543 > dashboard link: https://syzkaller.appspot.com/bug?extid=b592c1f562f0da80ce2c > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15741e22a80000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=1105b4e2a80000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/098f7ee2237c/disk-123212f5.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/88defebbfc49/vmlinux-123212f5.xz > kernel image: https://storage.googleapis.com/syzbot-assets/d5e9343ec16a/bzImage-123212f5.xz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+b592c1f562f0da80ce2c@xxxxxxxxxxxxxxxxxxxxxxxxx > > general protection fault, probably for non-canonical address 0xdffffc000000001c: 0000 [#1] PREEMPT SMP KASAN > KASAN: null-ptr-deref in range [0x00000000000000e0-0x00000000000000e7] > CPU: 1 PID: 5024 Comm: syz-executor280 Not tainted 6.4.0-next-20230707-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023 > RIP: 0010:ovl_do_getxattr fs/overlayfs/overlayfs.h:263 [inline] > RIP: 0010:ovl_path_getxattr fs/overlayfs/overlayfs.h:292 [inline] > RIP: 0010:ovl_init_uuid_xattr+0x1f6/0xa90 fs/overlayfs/util.c:695 > Code: c1 ea 03 80 3c 02 00 0f 85 54 08 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 74 24 08 48 8d be e0 00 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 f2 07 00 00 4c 89 e1 48 8b 86 e0 00 00 00 48 ba > RSP: 0018:ffffc90003aafab8 EFLAGS: 00010202 > RAX: dffffc0000000000 RBX: ffff888014e67c00 RCX: 0000000000000005 > RDX: 000000000000001c RSI: 0000000000000000 RDI: 00000000000000e0 > RBP: ffff888029c04678 R08: 0000000000000001 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801927c480 > R13: ffff888014e67c79 R14: ffff888014e67c60 R15: 0000000000000000 > FS: 0000555556b13300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000020001000 CR3: 0000000022580000 CR4: 00000000003506e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > ovl_fill_super+0x1f94/0x5d70 fs/overlayfs/super.c:1437 > vfs_get_super+0xea/0x280 fs/super.c:1152 > vfs_get_tree+0x8d/0x350 fs/super.c:1519 > do_new_mount fs/namespace.c:3335 [inline] > path_mount+0x136e/0x1e70 fs/namespace.c:3662 > do_mount fs/namespace.c:3675 [inline] > __do_sys_mount fs/namespace.c:3884 [inline] > __se_sys_mount fs/namespace.c:3861 [inline] > __x64_sys_mount+0x283/0x300 fs/namespace.c:3861 > do_syscall_x64 arch/x86/entry/common.c:50 [inline] > do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80 > entry_SYSCALL_64_after_hwframe+0x63/0xcd > RIP: 0033:0x7f60c9bc0b09 > Code: 28 c3 e8 2a 14 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:00007ffc22c0ccf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 > RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f60c9bc0b09 > RDX: 00000000200000c0 RSI: 0000000020000200 RDI: 0000000000000000 > RBP: 00007f60c9b84cb0 R08: 0000000020000480 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 00007f60c9b84d40 > R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 > </TASK> > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:ovl_do_getxattr fs/overlayfs/overlayfs.h:263 [inline] > RIP: 0010:ovl_path_getxattr fs/overlayfs/overlayfs.h:292 [inline] > RIP: 0010:ovl_init_uuid_xattr+0x1f6/0xa90 fs/overlayfs/util.c:695 > Code: c1 ea 03 80 3c 02 00 0f 85 54 08 00 00 48 b8 00 00 00 00 00 fc ff df 49 8b 74 24 08 48 8d be e0 00 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 f2 07 00 00 4c 89 e1 48 8b 86 e0 00 00 00 48 ba > RSP: 0018:ffffc90003aafab8 EFLAGS: 00010202 > RAX: dffffc0000000000 RBX: ffff888014e67c00 RCX: 0000000000000005 > RDX: 000000000000001c RSI: 0000000000000000 RDI: 00000000000000e0 > RBP: ffff888029c04678 R08: 0000000000000001 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000001 R12: ffff88801927c480 > R13: ffff888014e67c79 R14: ffff888014e67c60 R15: 0000000000000000 > FS: 0000555556b13300(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000000020001000 CR3: 0000000022580000 CR4: 00000000003506e0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > ---------------- > Code disassembly (best guess): > 0: c1 ea 03 shr $0x3,%edx > 3: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) > 7: 0f 85 54 08 00 00 jne 0x861 > d: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax > 14: fc ff df > 17: 49 8b 74 24 08 mov 0x8(%r12),%rsi > 1c: 48 8d be e0 00 00 00 lea 0xe0(%rsi),%rdi > 23: 48 89 fa mov %rdi,%rdx > 26: 48 c1 ea 03 shr $0x3,%rdx > * 2a: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction > 2e: 0f 85 f2 07 00 00 jne 0x826 > 34: 4c 89 e1 mov %r12,%rcx > 37: 48 8b 86 e0 00 00 00 mov 0xe0(%rsi),%rax > 3e: 48 rex.W > 3f: ba .byte 0xba > > > --- > 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. > > If the bug is already fixed, let syzbot know by replying with: > #syz fix: exact-commit-title > > If you want syzbot to run the reproducer, reply with: > #syz test: git://repo/address.git branch-or-commit-hash > If you attach or paste a git patch, syzbot will apply it before testing. #syz test: git://git.kernel.org/pub/scm/linux/kernel/git/overlayfs/vfs.git overlayfs-next
