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Message-ID: <000000000000d92e6a061d45ffa3@google.com> Date: Mon, 15 Jul 2024 02:39:02 -0700 From: syzbot <syzbot+9af29acd8f27fbce94bc@...kaller.appspotmail.com> To: almaz.alexandrovich@...agon-software.com, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [ntfs3?] general protection fault in run_is_mapped_full Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: general protection fault in run_is_mapped_full loop0: detected capacity change from 0 to 4096 ntfs3: loop0: Different NTFS sector size (1024) and media sector size (512). Oops: general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f] CPU: 1 PID: 6004 Comm: syz.0.15 Not tainted 6.10.0-rc1-syzkaller-00034-geb95678ee930 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024 RIP: 0010:run_lookup fs/ntfs3/run.c:39 [inline] RIP: 0010:run_is_mapped_full+0x35/0x480 fs/ntfs3/run.c:173 Code: 41 54 53 48 83 ec 30 41 89 d4 41 89 f6 49 89 fd 49 bf 00 00 00 00 00 fc ff df e8 36 e5 a7 fe 49 8d 5d 08 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 6c 9c 0d ff 48 8b 1b 31 ff 48 89 RSP: 0018:ffffc9000329f758 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000008 RCX: ffff88807b0c5a00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000329fb18 R08: ffffffff82e4ba0a R09: ffffffff82ee0999 R10: 0000000000000002 R11: ffff88807b0c5a00 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f826d7ef6c0(0000) GS:ffff8880b9500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fb79d6ff095 CR3: 000000007ccc0000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> attr_load_runs fs/ntfs3/attrib.c:69 [inline] attr_set_size+0xfdf/0x4300 fs/ntfs3/attrib.c:502 ntfs_create_inode+0x252d/0x37f0 fs/ntfs3/inode.c:1719 ntfs_symlink+0xde/0x110 fs/ntfs3/namei.c:199 vfs_symlink+0x137/0x2e0 fs/namei.c:4489 do_symlinkat+0x222/0x3a0 fs/namei.c:4515 __do_sys_symlinkat fs/namei.c:4531 [inline] __se_sys_symlinkat fs/namei.c:4528 [inline] __x64_sys_symlinkat+0x99/0xb0 fs/namei.c:4528 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: 0033:0x7f826c975bd9 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:00007f826d7ef048 EFLAGS: 00000246 ORIG_RAX: 000000000000010a RAX: ffffffffffffffda RBX: 00007f826cb03f60 RCX: 00007f826c975bd9 RDX: 0000000020000440 RSI: 0000000000000006 RDI: 0000000020000340 RBP: 00007f826c9e4e60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000000000b R14: 00007f826cb03f60 R15: 00007ffc50a8ce78 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:run_lookup fs/ntfs3/run.c:39 [inline] RIP: 0010:run_is_mapped_full+0x35/0x480 fs/ntfs3/run.c:173 Code: 41 54 53 48 83 ec 30 41 89 d4 41 89 f6 49 89 fd 49 bf 00 00 00 00 00 fc ff df e8 36 e5 a7 fe 49 8d 5d 08 48 89 d8 48 c1 e8 03 <42> 80 3c 38 00 74 08 48 89 df e8 6c 9c 0d ff 48 8b 1b 31 ff 48 89 RSP: 0018:ffffc9000329f758 EFLAGS: 00010202 RAX: 0000000000000001 RBX: 0000000000000008 RCX: ffff88807b0c5a00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: ffffc9000329fb18 R08: ffffffff82e4ba0a R09: ffffffff82ee0999 R10: 0000000000000002 R11: ffff88807b0c5a00 R12: 0000000000000000 R13: 0000000000000000 R14: 0000000000000000 R15: dffffc0000000000 FS: 00007f826d7ef6c0(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f826cb000a0 CR3: 000000007ccc0000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 41 54 push %r12 2: 53 push %rbx 3: 48 83 ec 30 sub $0x30,%rsp 7: 41 89 d4 mov %edx,%r12d a: 41 89 f6 mov %esi,%r14d d: 49 89 fd mov %rdi,%r13 10: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 17: fc ff df 1a: e8 36 e5 a7 fe call 0xfea7e555 1f: 49 8d 5d 08 lea 0x8(%r13),%rbx 23: 48 89 d8 mov %rbx,%rax 26: 48 c1 e8 03 shr $0x3,%rax * 2a: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) <-- trapping instruction 2f: 74 08 je 0x39 31: 48 89 df mov %rbx,%rdi 34: e8 6c 9c 0d ff call 0xff0d9ca5 39: 48 8b 1b mov (%rbx),%rbx 3c: 31 ff xor %edi,%edi 3e: 48 rex.W 3f: 89 .byte 0x89 Tested on: commit: eb95678e fs/ntfs3: Keep runs for $MFT::$ATTR_DATA and .. git tree: https://github.com/Paragon-Software-Group/linux-ntfs3.git console output: https://syzkaller.appspot.com/x/log.txt?x=16543f85980000 kernel config: https://syzkaller.appspot.com/x/.config?x=2f1c94a15f7c9744 dashboard link: https://syzkaller.appspot.com/bug?extid=9af29acd8f27fbce94bc compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 Note: no patches were applied.
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