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List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [syzbot] [btrfs?] general protection fault in getname_kernel (2) To: syzbot , clm@fb.com, dsterba@suse.com, josef@toxicpanda.com, linux-btrfs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com References: <67071fcf.050a0220.1139e6.0013.GAE@google.com> Content-Language: en-US From: Qu Wenruo Autocrypt: addr=quwenruo.btrfs@gmx.com; keydata= xsBNBFnVga8BCACyhFP3ExcTIuB73jDIBA/vSoYcTyysFQzPvez64TUSCv1SgXEByR7fju3o 8RfaWuHCnkkea5luuTZMqfgTXrun2dqNVYDNOV6RIVrc4YuG20yhC1epnV55fJCThqij0MRL 1NxPKXIlEdHvN0Kov3CtWA+R1iNN0RCeVun7rmOrrjBK573aWC5sgP7YsBOLK79H3tmUtz6b 9Imuj0ZyEsa76Xg9PX9Hn2myKj1hfWGS+5og9Va4hrwQC8ipjXik6NKR5GDV+hOZkktU81G5 gkQtGB9jOAYRs86QG/b7PtIlbd3+pppT0gaS+wvwMs8cuNG+Pu6KO1oC4jgdseFLu7NpABEB AAHNIlF1IFdlbnJ1byA8cXV3ZW5ydW8uYnRyZnNAZ214LmNvbT7CwJQEEwEIAD4CGwMFCwkI BwIGFQgJCgsCBBYCAwECHgECF4AWIQQt33LlpaVbqJ2qQuHCPZHzoSX+qAUCY00iVQUJDToH 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+Qd5uNlLnahxeLNubDz0oasrO9FSd/LUBPuo9C+S5Kc9TaBFcvQOwH7YU7Ufa/txc/VqVJ8dp E29+KSgyVfRH1LzOSb7WION4+QtJ7TX0qM2NlbOR7rU/k1c2l7LN5FsHTEovGavRGaRhN4OGQ 8XvrU25fOOwGebRihHMHORi9O5zv9/w7SMcNp+dF1k9AzC8U1tQuqVmzzJn+SwL2o5YfRtdq+ qgrZnJHyXhvcfxfkEUe9V9/NP++9SUiMFrSPxgbbYMqg5dVmZZ59preWudHutCo679aOKriWe u4sL7LxaKbeUDPCGat0t/RnfyklwupSsyOkgPHYIrY6AP4woFWBNlgNW4HgcXJeHa+Xsb3OLd C54AxQxTpDMdg9LTgam+4F5feRas8NecIfwVp/+NNnmHMo8f5a5v0kc66AxPT6lKBErXDU8nl tXyBNuDG9xXv1k2c/QdIck2RIhgGfTQGZb0CfAijj2g99qF1xikoDVz7ipbUHFhIM7bV5OE4n arg2GZCoSxZ4k/xaPD/qz2OyTBjRuWLz8oqWOmqeTQboY0dOaFpOPMEPvmACmaALgLVzjm2ob qRA9o1o6Cu7PVA9KaYP48WsFtVi9d/8e74DgjZvlvm54A= #syz test: https://github.com/adam900710/linux.git subpage_read =E5=9C=A8 2024/10/10 10:59, syzbot =E5=86=99=E9=81=93: > Hello, > > syzbot has tested the proposed patch but the reproducer is still trigger= ing an issue: > general protection fault in getname_kernel > > Oops: general protection fault, probably for non-canonical address 0xdff= ffc0000000000: 0000 [#1] PREEMPT SMP KASAN PTI > KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] > CPU: 1 UID: 0 PID: 6008 Comm: syz.0.15 Not tainted 6.12.0-rc2-syzkaller-= 00045-g964c2da72390 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS = Google 09/13/2024 > RIP: 0010:strlen+0x2c/0x70 lib/string.c:402 > Code: 1e fa 41 57 41 56 41 54 53 49 89 fe 48 c7 c0 ff ff ff ff 49 bf 00 = 00 00 00 00 fc ff df 48 89 fb 49 89 c4 48 89 d8 48 c1 e8 03 <42> 0f b6 04 = 38 84 c0 75 12 48 ff c3 49 8d 44 24 01 43 80 7c 26 01 > RSP: 0018:ffffc900035af8a8 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88802d46bc00 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: 0000000000000000 R08: ffffffff942c58f7 R09: 1ffffffff2858b1e > R10: dffffc0000000000 R11: fffffbfff2858b1f R12: ffffffffffffffff > R13: ffff8880727f8000 R14: 0000000000000000 R15: dffffc0000000000 > FS: 00007f01495d76c0(0000) GS:ffff8880b8700000(0000) knlGS:000000000000= 0000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000001b2f75ffff CR3: 000000002cffe000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > > getname_kernel+0x1d/0x2f0 fs/namei.c:232 > kern_path+0x1d/0x50 fs/namei.c:2716 > is_good_dev_path fs/btrfs/volumes.c:760 [inline] > btrfs_scan_one_device+0x19e/0xd90 fs/btrfs/volumes.c:1492 > btrfs_get_tree_super fs/btrfs/super.c:1841 [inline] > btrfs_get_tree+0x30e/0x1920 fs/btrfs/super.c:2114 > vfs_get_tree+0x90/0x2b0 fs/super.c:1800 > fc_mount+0x1b/0xb0 fs/namespace.c:1231 > btrfs_get_tree_subvol fs/btrfs/super.c:2077 [inline] > btrfs_get_tree+0x652/0x1920 fs/btrfs/super.c:2115 > vfs_get_tree+0x90/0x2b0 fs/super.c:1800 > vfs_cmd_create+0xa0/0x1f0 fs/fsopen.c:225 > __do_sys_fsconfig fs/fsopen.c:472 [inline] > __se_sys_fsconfig+0xa1f/0xf70 fs/fsopen.c:344 > 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: 0033:0x7f014877dff9 > 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:00007f01495d7038 EFLAGS: 00000246 ORIG_RAX: 00000000000001af > RAX: ffffffffffffffda RBX: 00007f0148935f80 RCX: 00007f014877dff9 > RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000003 > RBP: 00007f01487f0296 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 > R13: 0000000000000000 R14: 00007f0148935f80 R15: 00007ffe7a9c13b8 > > Modules linked in: > ---[ end trace 0000000000000000 ]--- > RIP: 0010:strlen+0x2c/0x70 lib/string.c:402 > Code: 1e fa 41 57 41 56 41 54 53 49 89 fe 48 c7 c0 ff ff ff ff 49 bf 00 = 00 00 00 00 fc ff df 48 89 fb 49 89 c4 48 89 d8 48 c1 e8 03 <42> 0f b6 04 = 38 84 c0 75 12 48 ff c3 49 8d 44 24 01 43 80 7c 26 01 > RSP: 0018:ffffc900035af8a8 EFLAGS: 00010246 > RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88802d46bc00 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: 0000000000000000 R08: ffffffff942c58f7 R09: 1ffffffff2858b1e > R10: dffffc0000000000 R11: fffffbfff2858b1f R12: ffffffffffffffff > R13: ffff8880727f8000 R14: 0000000000000000 R15: dffffc0000000000 > FS: 00007f01495d76c0(0000) GS:ffff8880b8700000(0000) knlGS:000000000000= 0000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 0000001b2f75ffff CR3: 000000002cffe000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > ---------------- > Code disassembly (best guess), 1 bytes skipped: > 0: fa cli > 1: 41 57 push %r15 > 3: 41 56 push %r14 > 5: 41 54 push %r12 > 7: 53 push %rbx > 8: 49 89 fe mov %rdi,%r14 > b: 48 c7 c0 ff ff ff ff mov $0xffffffffffffffff,%rax > 12: 49 bf 00 00 00 00 00 movabs $0xdffffc0000000000,%r15 > 19: fc ff df > 1c: 48 89 fb mov %rdi,%rbx > 1f: 49 89 c4 mov %rax,%r12 > 22: 48 89 d8 mov %rbx,%rax > 25: 48 c1 e8 03 shr $0x3,%rax > * 29: 42 0f b6 04 38 movzbl (%rax,%r15,1),%eax <-- trapping instr= uction > 2e: 84 c0 test %al,%al > 30: 75 12 jne 0x44 > 32: 48 ff c3 inc %rbx > 35: 49 8d 44 24 01 lea 0x1(%r12),%rax > 3a: 43 rex.XB > 3b: 80 .byte 0x80 > 3c: 7c 26 jl 0x64 > 3e: 01 .byte 0x1 > > > Tested on: > > commit: 964c2da7 btrfs: make buffered write to copy one page a.. > git tree: https://github.com/adam900710/linux.git subpage_read > console output: https://syzkaller.appspot.com/x/log.txt?x=3D1296b7d05800= 00 > kernel config: https://syzkaller.appspot.com/x/.config?x=3D3ec5955a0d4f= 6ede > dashboard link: https://syzkaller.appspot.com/bug?extid=3Dcee29f5a48caf1= 0cd475 > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for De= bian) 2.40 > > Note: no patches were applied.