| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Message-ID: <yashsei2srtn35imny476up2r3vui3mj3totulsshbbpvouiqd@ajuj6lafmh4x> Date: Sun, 8 Jun 2025 23:13:52 -0400 From: Kent Overstreet <kent.overstreet@...ux.dev> To: syzbot <syzbot+e37a1730d63d207fe403@...kaller.appspotmail.com> Cc: gregkh@...uxfoundation.org, linux-bcachefs@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com, tj@...nel.org Subject: Re: [syzbot] [kernfs?] [bcachefs?] general protection fault in kernfs_dop_revalidate I'm not seeing anything connecting this to bcachefs. On Tue, Nov 26, 2024 at 02:54:23AM -0800, syzbot wrote: > Hello, > > syzbot found the following issue on: > > HEAD commit: 28eb75e178d3 Merge tag 'drm-next-2024-11-21' of https://gi.. > git tree: upstream > console output: https://syzkaller.appspot.com/x/log.txt?x=17955b78580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=402159daa216c89d > dashboard link: https://syzkaller.appspot.com/bug?extid=e37a1730d63d207fe403 > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=163706e8580000 > > Downloadable assets: > disk image: https://storage.googleapis.com/syzbot-assets/e3c9c97af7d9/disk-28eb75e1.raw.xz > vmlinux: https://storage.googleapis.com/syzbot-assets/1e22f3d29103/vmlinux-28eb75e1.xz > kernel image: https://storage.googleapis.com/syzbot-assets/8ff56ec30fa6/bzImage-28eb75e1.xz > mounted in repro: https://storage.googleapis.com/syzbot-assets/92ddc9fa5ec9/mount_0.gz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+e37a1730d63d207fe403@...kaller.appspotmail.com > > Oops: general protection fault, probably for non-canonical address 0xdffffc000000000a: 0000 [#1] PREEMPT SMP KASAN PTI > KASAN: null-ptr-deref in range [0x0000000000000050-0x0000000000000057] > CPU: 0 UID: 0 PID: 5210 Comm: udevd Not tainted 6.12.0-syzkaller-07749-g28eb75e178d3 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 > RIP: 0010:kernfs_root fs/kernfs/kernfs-internal.h:70 [inline] > RIP: 0010:kernfs_dop_revalidate+0x8e/0x560 fs/kernfs/dir.c:1158 > Code: c5 80 04 00 00 48 89 e8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 ef e8 c1 9e c1 ff 4c 8b 7d 00 4d 8d 67 30 4c 89 e3 48 c1 eb 03 <42> 80 3c 33 00 74 08 4c 89 e7 e8 a3 9e c1 ff 49 8b 6f 30 48 85 ed > RSP: 0018:ffffc900033efa90 EFLAGS: 00010206 > RAX: 1ffff1100c748639 RBX: 000000000000000a RCX: ffff88807deada00 > RDX: ffff88807deada00 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: ffff888063a431c8 R08: ffffffff823b3da8 R09: 1ffffffff20391a6 > R10: dffffc0000000000 R11: ffffffff823b3d80 R12: 0000000000000051 > R13: ffff88807affb318 R14: dffffc0000000000 R15: 0000000000000021 > FS: 00007fa024cb5c80(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007fe48c1ff000 CR3: 000000007d586000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <TASK> > lookup_fast+0x1f4/0x4a0 > walk_component+0x57/0x410 fs/namei.c:2108 > lookup_last fs/namei.c:2610 [inline] > path_lookupat+0x16f/0x450 fs/namei.c:2634 > filename_lookup+0x2a3/0x670 fs/namei.c:2663 > do_readlinkat+0xf0/0x3a0 fs/stat.c:562 > __do_sys_readlink fs/stat.c:599 [inline] > __se_sys_readlink fs/stat.c:596 [inline] > __x64_sys_readlink+0x7f/0x90 fs/stat.c:596 > 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: 0033:0x7fa024917d47 > Code: 73 01 c3 48 8b 0d e1 90 0d 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 b8 59 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d b1 90 0d 00 f7 d8 64 89 01 48 > RSP: 002b:00007ffdac68fa58 EFLAGS: 00000246 ORIG_RAX: 0000000000000059 > RAX: ffffffffffffffda RBX: 00007ffdac68fa68 RCX: 00007fa024917d47 > RDX: 0000000000000400 RSI: 00007ffdac68fa68 RDI: 00007ffdac68ff48 > RBP: 0000000000000400 R08: 000055b53fcce374 R09: 0000000000000000 > R10: 0000000000000812 R11: 0000000000000246 R12: 00007ffdac68ff48 > R13: 00007ffdac68feb8 R14: 000055b53fcc3910 R15: 0000000000000000 > </TASK> > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:kernfs_root fs/kernfs/kernfs-internal.h:70 [inline] > RIP: 0010:kernfs_dop_revalidate+0x8e/0x560 fs/kernfs/dir.c:1158 > Code: c5 80 04 00 00 48 89 e8 48 c1 e8 03 42 80 3c 30 00 74 08 48 89 ef e8 c1 9e c1 ff 4c 8b 7d 00 4d 8d 67 30 4c 89 e3 48 c1 eb 03 <42> 80 3c 33 00 74 08 4c 89 e7 e8 a3 9e c1 ff 49 8b 6f 30 48 85 ed > RSP: 0018:ffffc900033efa90 EFLAGS: 00010206 > > RAX: 1ffff1100c748639 RBX: 000000000000000a RCX: ffff88807deada00 > RDX: ffff88807deada00 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: ffff888063a431c8 R08: ffffffff823b3da8 R09: 1ffffffff20391a6 > R10: dffffc0000000000 R11: ffffffff823b3d80 R12: 0000000000000051 > R13: ffff88807affb318 R14: dffffc0000000000 R15: 0000000000000021 > FS: 00007fa024cb5c80(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000001b2ee5ffff CR3: 000000007d586000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > ---------------- > Code disassembly (best guess), 1 bytes skipped: > 0: 80 04 00 00 addb $0x0,(%rax,%rax,1) > 4: 48 89 e8 mov %rbp,%rax > 7: 48 c1 e8 03 shr $0x3,%rax > b: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) > 10: 74 08 je 0x1a > 12: 48 89 ef mov %rbp,%rdi > 15: e8 c1 9e c1 ff call 0xffc19edb > 1a: 4c 8b 7d 00 mov 0x0(%rbp),%r15 > 1e: 4d 8d 67 30 lea 0x30(%r15),%r12 > 22: 4c 89 e3 mov %r12,%rbx > 25: 48 c1 eb 03 shr $0x3,%rbx > * 29: 42 80 3c 33 00 cmpb $0x0,(%rbx,%r14,1) <-- trapping instruction > 2e: 74 08 je 0x38 > 30: 4c 89 e7 mov %r12,%rdi > 33: e8 a3 9e c1 ff call 0xffc19edb > 38: 49 8b 6f 30 mov 0x30(%r15),%rbp > 3c: 48 85 ed test %rbp,%rbp > > > --- > 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 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. > > 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
Powered by blists - more mailing lists