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Message-ID: <6727bbdf.050a0220.3c8d68.0a7e.GAE@google.com> Date: Sun, 03 Nov 2024 10:07:27 -0800 From: syzbot <syzbot+0b1279812c46e48bb0c1@...kaller.appspotmail.com> To: linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, miklos@...redi.hu, syzkaller-bugs@...glegroups.com Subject: [syzbot] [fuse?] general protection fault in fuse_do_readpage Hello, syzbot found the following issue on: HEAD commit: c1e939a21eb1 Merge tag 'cgroup-for-6.12-rc5-fixes' of git:.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=173f255f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=4340261e4e9f37fc dashboard link: https://syzkaller.appspot.com/bug?extid=0b1279812c46e48bb0c1 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=12401540580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10e64630580000 Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/7feb34a89c2a/non_bootable_disk-c1e939a2.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/5f1b9c52b9e0/vmlinux-c1e939a2.xz kernel image: https://storage.googleapis.com/syzbot-assets/8f31f28c172e/bzImage-c1e939a2.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+0b1279812c46e48bb0c1@...kaller.appspotmail.com Oops: general protection fault, probably for non-canonical address 0xdffffc000000000c: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067] CPU: 3 UID: 0 PID: 5947 Comm: syz-executor314 Not tainted 6.12.0-rc5-syzkaller-00044-gc1e939a21eb1 #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:fuse_read_args_fill fs/fuse/file.c:631 [inline] RIP: 0010:fuse_do_readpage+0x276/0x640 fs/fuse/file.c:880 Code: e8 9f c7 91 fe 8b 44 24 10 89 44 24 78 41 89 c4 e8 8f c7 91 fe 48 8d 7b 60 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1d 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b RSP: 0018:ffffc90006a0f820 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff82fbb4c9 RDX: 000000000000000c RSI: ffffffff82fbb4f1 RDI: 0000000000000060 RBP: 0000000000000000 R08: 0000000000000007 R09: 7fffffffffffffff R10: 0000000000000fff R11: ffffffff961d4b88 R12: 0000000000001000 R13: ffff8880382b8000 R14: ffff888025153780 R15: ffffc90006a0f8b8 FS: 00007f7583f3d6c0(0000) GS:ffff88806a900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000240 CR3: 0000000030d30000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> fuse_read_folio+0xb0/0x100 fs/fuse/file.c:905 filemap_read_folio+0xc6/0x2a0 mm/filemap.c:2367 do_read_cache_folio+0x263/0x5c0 mm/filemap.c:3825 read_mapping_folio include/linux/pagemap.h:1011 [inline] erofs_bread+0x34d/0x7e0 fs/erofs/data.c:41 erofs_read_superblock fs/erofs/super.c:281 [inline] erofs_fc_fill_super+0x2b9/0x2500 fs/erofs/super.c:625 vfs_get_super fs/super.c:1280 [inline] get_tree_nodev+0xda/0x190 fs/super.c:1299 erofs_fc_get_tree+0x1fe/0x2e0 fs/erofs/super.c:723 vfs_get_tree+0x8f/0x380 fs/super.c:1800 do_new_mount fs/namespace.c:3507 [inline] path_mount+0x14e6/0x1f20 fs/namespace.c:3834 do_mount fs/namespace.c:3847 [inline] __do_sys_mount fs/namespace.c:4057 [inline] __se_sys_mount fs/namespace.c:4034 [inline] __x64_sys_mount+0x294/0x320 fs/namespace.c:4034 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f7583f813b9 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 b0 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f7583f3d218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f758400d3e8 RCX: 00007f7583f813b9 RDX: 00000000200000c0 RSI: 0000000020000000 RDI: 0000000020000240 RBP: 00007f758400d3e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000010000 R11: 0000000000000246 R12: 00007f7583fda034 R13: 0030656c69662f2e R14: 00007f7583fda050 R15: 00007f7583fd800e </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:fuse_read_args_fill fs/fuse/file.c:631 [inline] RIP: 0010:fuse_do_readpage+0x276/0x640 fs/fuse/file.c:880 Code: e8 9f c7 91 fe 8b 44 24 10 89 44 24 78 41 89 c4 e8 8f c7 91 fe 48 8d 7b 60 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1d 03 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b RSP: 0018:ffffc90006a0f820 EFLAGS: 00010206 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffffff82fbb4c9 RDX: 000000000000000c RSI: ffffffff82fbb4f1 RDI: 0000000000000060 RBP: 0000000000000000 R08: 0000000000000007 R09: 7fffffffffffffff R10: 0000000000000fff R11: ffffffff961d4b88 R12: 0000000000001000 R13: ffff8880382b8000 R14: ffff888025153780 R15: ffffc90006a0f8b8 FS: 00007f7583f3d6c0(0000) GS:ffff88806a900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000240 CR3: 0000000030d30000 CR4: 0000000000352ef0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: e8 9f c7 91 fe call 0xfe91c7a4 5: 8b 44 24 10 mov 0x10(%rsp),%eax 9: 89 44 24 78 mov %eax,0x78(%rsp) d: 41 89 c4 mov %eax,%r12d 10: e8 8f c7 91 fe call 0xfe91c7a4 15: 48 8d 7b 60 lea 0x60(%rbx),%rdi 19: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 20: fc ff df 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 1d 03 00 00 jne 0x351 34: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 3b: fc ff df 3e: 48 rex.W 3f: 8b .byte 0x8b --- 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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