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Message-ID: <000000000000f52642060d4e3750@google.com> Date: Sun, 24 Dec 2023 20:44:17 -0800 From: syzbot <syzbot+f9238a0a31f9b5603fef@...kaller.appspotmail.com> To: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] [fs?] BUG: unable to handle kernel NULL pointer dereference in do_pagemap_scan Hello, syzbot found the following issue on: HEAD commit: 861deac3b092 Linux 6.7-rc7 git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=12bf6e26e80000 kernel config: https://syzkaller.appspot.com/x/.config?x=298e57794135adf0 dashboard link: https://syzkaller.appspot.com/bug?extid=f9238a0a31f9b5603fef compiler: gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13f4fc81e80000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15997e81e80000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/b1f4e427f08b/disk-861deac3.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/81317757e796/vmlinux-861deac3.xz kernel image: https://storage.googleapis.com/syzbot-assets/f9d2dcfac209/bzImage-861deac3.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+f9238a0a31f9b5603fef@...kaller.appspotmail.com general protection fault, probably for non-canonical address 0xdffffc00000000fe: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x00000000000007f0-0x00000000000007f7] CPU: 0 PID: 5068 Comm: syz-executor316 Not tainted 6.7.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/17/2023 RIP: 0010:mm_has_notifiers include/linux/mmu_notifier.h:282 [inline] RIP: 0010:mmu_notifier_invalidate_range_start include/linux/mmu_notifier.h:455 [inline] RIP: 0010:do_pagemap_scan+0xa89/0xcd0 fs/proc/task_mmu.c:2438 Code: 8d 41 b8 01 00 00 00 e8 c5 0b 57 ff 48 8b 5c 24 78 58 48 b8 00 00 00 00 00 fc ff df 48 8d bb f0 07 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 f8 01 00 00 48 83 bb f0 07 00 00 00 0f 85 1d 01 RSP: 0018:ffffc9000425fcf0 EFLAGS: 00010212 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8167148e RDX: 00000000000000fe RSI: ffffffff8accb1a0 RDI: 00000000000007f0 RBP: 0000000020ffc000 R08: 0000000000000000 R09: fffffbfff23e37d2 R10: ffffffff91f1be97 R11: 0000000000000000 R12: 000000000000230e R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000 FS: 00005555564df380(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000005fdeb8 CR3: 00000000740db000 CR4: 0000000000350ef0 Call Trace: <TASK> do_pagemap_cmd+0x5e/0x80 fs/proc/task_mmu.c:2494 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:871 [inline] __se_sys_ioctl fs/ioctl.c:857 [inline] __x64_sys_ioctl+0x18f/0x210 fs/ioctl.c:857 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f0993b4dbf9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 c1 17 00 00 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 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe8cc5b718 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007f0993b4dbf9 RDX: 0000000020000180 RSI: 00000000c0606610 RDI: 0000000000000004 RBP: 00007f0993bc05f0 R08: 00007ffe8cc5b3c4 R09: 0000000000000006 R10: 0000000000000014 R11: 0000000000000246 R12: 0000000000000001 R13: 431bde82d7b634db R14: 0000000000000001 R15: 0000000000000001 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:mm_has_notifiers include/linux/mmu_notifier.h:282 [inline] RIP: 0010:mmu_notifier_invalidate_range_start include/linux/mmu_notifier.h:455 [inline] RIP: 0010:do_pagemap_scan+0xa89/0xcd0 fs/proc/task_mmu.c:2438 Code: 8d 41 b8 01 00 00 00 e8 c5 0b 57 ff 48 8b 5c 24 78 58 48 b8 00 00 00 00 00 fc ff df 48 8d bb f0 07 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 f8 01 00 00 48 83 bb f0 07 00 00 00 0f 85 1d 01 RSP: 0018:ffffc9000425fcf0 EFLAGS: 00010212 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff8167148e RDX: 00000000000000fe RSI: ffffffff8accb1a0 RDI: 00000000000007f0 RBP: 0000000020ffc000 R08: 0000000000000000 R09: fffffbfff23e37d2 R10: ffffffff91f1be97 R11: 0000000000000000 R12: 000000000000230e R13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000000 FS: 00005555564df380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0993b80b00 CR3: 00000000740db000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess): 0: 8d 41 b8 lea -0x48(%rcx),%eax 3: 01 00 add %eax,(%rax) 5: 00 00 add %al,(%rax) 7: e8 c5 0b 57 ff call 0xff570bd1 c: 48 8b 5c 24 78 mov 0x78(%rsp),%rbx 11: 58 pop %rax 12: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 19: fc ff df 1c: 48 8d bb f0 07 00 00 lea 0x7f0(%rbx),%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 f8 01 00 00 jne 0x22c 34: 48 83 bb f0 07 00 00 cmpq $0x0,0x7f0(%rbx) 3b: 00 3c: 0f .byte 0xf 3d: 85 .byte 0x85 3e: 1d .byte 0x1d 3f: 01 .byte 0x1 --- 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
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