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Message-ID: <6756d3e2.050a0220.a30f1.019d.GAE@google.com> Date: Mon, 09 Dec 2024 03:26:26 -0800 From: syzbot <syzbot+ff3c3b48f27747505446@...kaller.appspotmail.com> To: linkinjeon@...nel.org, linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, sj1557.seo@...sung.com, syzkaller-bugs@...glegroups.com, yuezhang.mo@...y.com Subject: [syzbot] [exfat?] general protection fault in exfat_init_dir_entry Hello, syzbot found the following issue on: HEAD commit: 62b5a46999c7 Merge tag '6.13-rc1-smb3-client-fixes' of git.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=17679944580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1362a5aee630ff34 dashboard link: https://syzkaller.appspot.com/bug?extid=ff3c3b48f27747505446 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-62b5a469.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/2545deb88ab1/vmlinux-62b5a469.xz kernel image: https://storage.googleapis.com/syzbot-assets/7af07c0abbf0/bzImage-62b5a469.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+ff3c3b48f27747505446@...kaller.appspotmail.com syz.0.0: attempt to access beyond end of device loop0: rw=0, sector=161, nr_sectors = 1 limit=134 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] CPU: 0 UID: 0 PID: 5331 Comm: syz.0.0 Not tainted 6.13.0-rc1-syzkaller-00378-g62b5a46999c7 #0 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 RIP: 0010:exfat_get_dentry_cached fs/exfat/dir.c:727 [inline] RIP: 0010:exfat_init_dir_entry+0x556/0x9c0 fs/exfat/dir.c:460 Code: 48 98 49 8d 1c c7 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 d8 66 89 ff 48 8b 1b 48 83 c3 28 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 bb 66 89 ff 4c 8b 3b 42 80 7c 2d RSP: 0018:ffffc9000d4472f8 EFLAGS: 00010206 RAX: 0000000000000005 RBX: 0000000000000028 RCX: 0000000000000009 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000000020 RBP: 1ffff92001a88edc R08: ffffffff8280f817 R09: 0000000000000000 R10: ffffc9000d447240 R11: fffff52001a88e4d R12: 0000000000000200 R13: dffffc0000000000 R14: ffff88801ab22000 R15: ffffc9000d4476f0 FS: 00007fa72178f6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffcf81a2818 CR3: 0000000034a2e000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> exfat_add_entry+0x516/0xaa0 fs/exfat/namei.c:516 exfat_create+0x1c7/0x570 fs/exfat/namei.c:565 lookup_open fs/namei.c:3649 [inline] open_last_lookups fs/namei.c:3748 [inline] path_openat+0x1c03/0x3590 fs/namei.c:3984 do_filp_open+0x27f/0x4e0 fs/namei.c:4014 do_sys_openat2+0x13e/0x1d0 fs/open.c:1402 do_sys_open fs/open.c:1417 [inline] __do_sys_openat fs/open.c:1433 [inline] __se_sys_openat fs/open.c:1428 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1428 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fa72097fed9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fa72178f058 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007fa720b45fa0 RCX: 00007fa72097fed9 RDX: 0000000000141842 RSI: 0000000020000080 RDI: ffffffffffffff9c RBP: 00007fa7209f3cc8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fa720b45fa0 R15: 00007ffea8996448 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:exfat_get_dentry_cached fs/exfat/dir.c:727 [inline] RIP: 0010:exfat_init_dir_entry+0x556/0x9c0 fs/exfat/dir.c:460 Code: 48 98 49 8d 1c c7 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 d8 66 89 ff 48 8b 1b 48 83 c3 28 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 bb 66 89 ff 4c 8b 3b 42 80 7c 2d RSP: 0018:ffffc9000d4472f8 EFLAGS: 00010206 RAX: 0000000000000005 RBX: 0000000000000028 RCX: 0000000000000009 RDX: 0000000000000000 RSI: 0000000000000009 RDI: 0000000000000020 RBP: 1ffff92001a88edc R08: ffffffff8280f817 R09: 0000000000000000 R10: ffffc9000d447240 R11: fffff52001a88e4d R12: 0000000000000200 R13: dffffc0000000000 R14: ffff88801ab22000 R15: ffffc9000d4476f0 FS: 00007fa72178f6c0(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffea8995c80 CR3: 0000000034a2e000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 48 98 cltq 2: 49 8d 1c c7 lea (%r15,%rax,8),%rbx 6: 48 89 d8 mov %rbx,%rax 9: 48 c1 e8 03 shr $0x3,%rax d: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) 12: 74 08 je 0x1c 14: 48 89 df mov %rbx,%rdi 17: e8 d8 66 89 ff call 0xff8966f4 1c: 48 8b 1b mov (%rbx),%rbx 1f: 48 83 c3 28 add $0x28,%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 28 00 cmpb $0x0,(%rax,%r13,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 bb 66 89 ff call 0xff8966f4 39: 4c 8b 3b mov (%rbx),%r15 3c: 42 rex.X 3d: 80 .byte 0x80 3e: 7c 2d jl 0x6d --- 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@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
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