From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f208.google.com (mail-il1-f208.google.com [209.85.166.208]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 69A9E1DC9AB for ; Wed, 11 Dec 2024 22:55:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.208 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733957727; cv=none; b=m5NOY7GoKXEnU2trdqUAqNkNAmKw9JTJPqmw17JRLAiIR6YkiC0W6wr++Mi7lBT9QmaI5Lw5BwMpC9svUEbVHWyZSiYugm2YNMzw+SNlDWz0HhjWqZlqUWwTj/Wfl1EwPVIlDwE5QKikUv7aX0Qzf3FkqZMDb23oJ15TMuV2SVc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733957727; c=relaxed/simple; bh=jc0W9O2uQ3OGTE/F6KtTKL+X+KlvTdfhU+I1mKDM9Zs=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; 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List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:1566:b0:3a7:8720:9ea4 with SMTP id e9e14a558f8ab-3ac47597cecmr14073855ab.5.1733957723097; Wed, 11 Dec 2024 14:55:23 -0800 (PST) Date: Wed, 11 Dec 2024 14:55:23 -0800 In-Reply-To: <674f4e43.050a0220.17bd51.004e.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <675a185b.050a0220.17f54a.0049.GAE@google.com> Subject: Re: [syzbot] [exfat?] general protection fault in exfat_get_dentry_cached From: syzbot To: linkinjeon@kernel.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, sj1557.seo@samsung.com, syzkaller-bugs@googlegroups.com, yuezhang.mo@sony.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: f92f4749861b Merge tag 'clk-fixes-for-linus' of git://git... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=144e7544580000 kernel config: https://syzkaller.appspot.com/x/.config?x=df9504e360281ee5 dashboard link: https://syzkaller.appspot.com/bug?extid=8f8fe64a30c50b289a18 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=10bfbb30580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=124e7544580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/ca4977648e90/disk-f92f4749.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f743aedaf863/vmlinux-f92f4749.xz kernel image: https://storage.googleapis.com/syzbot-assets/9d7aea41c35c/bzImage-f92f4749.xz mounted in repro: https://storage.googleapis.com/syzbot-assets/4e5e94b5fe8e/mount_0.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+8f8fe64a30c50b289a18@syzkaller.appspotmail.com syz-executor248: attempt to access beyond end of device loop0: rw=524288, sector=165, nr_sectors = 1 limit=64 syz-executor248: attempt to access beyond end of device loop0: rw=524288, sector=166, nr_sectors = 1 limit=64 syz-executor248: attempt to access beyond end of device loop0: rw=524288, sector=167, nr_sectors = 1 limit=64 syz-executor248: attempt to access beyond end of device loop0: rw=0, sector=161, nr_sectors = 1 limit=64 Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] PREEMPT SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f] CPU: 0 UID: 0 PID: 5825 Comm: syz-executor248 Not tainted 6.13.0-rc2-syzkaller-00031-gf92f4749861b #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024 RIP: 0010:exfat_get_dentry_cached+0x11a/0x1b0 fs/exfat/dir.c:727 Code: df 48 89 da 48 c1 ea 03 80 3c 02 00 0f 85 9d 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 1b 48 8d 7b 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 61 49 8d 7d 18 48 8b 43 28 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc900032df378 EFLAGS: 00010216 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000009 RDX: 0000000000000005 RSI: ffffffff82705916 RDI: 0000000000000028 RBP: 0000000000000200 R08: 0000000000000001 R09: 000000000000001f R10: 0000000000000009 R11: 0000000000000003 R12: ffffc900032df4a0 R13: ffff8880350f6000 R14: 0000000000000009 R15: 0000000000000010 FS: 00007f9512b986c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055ea395f6818 CR3: 000000007542e000 CR4: 0000000000350ef0 Call Trace: exfat_init_ext_entry+0x1b6/0x3b0 fs/exfat/dir.c:498 exfat_add_entry+0x321/0x7a0 fs/exfat/namei.c:517 exfat_create+0x1cf/0x5c0 fs/exfat/namei.c:565 lookup_open.isra.0+0x1177/0x14c0 fs/namei.c:3649 open_last_lookups fs/namei.c:3748 [inline] path_openat+0x904/0x2d60 fs/namei.c:3984 do_filp_open+0x20c/0x470 fs/namei.c:4014 do_sys_openat2+0x17a/0x1e0 fs/open.c:1402 do_sys_open fs/open.c:1417 [inline] __do_sys_creat fs/open.c:1495 [inline] __se_sys_creat fs/open.c:1489 [inline] __x64_sys_creat+0xcd/0x120 fs/open.c:1489 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: 0033:0x7f9512c02be9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 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:00007f9512b98168 EFLAGS: 00000246 ORIG_RAX: 0000000000000055 RAX: ffffffffffffffda RBX: 00007f9512c8c6d8 RCX: 00007f9512c02be9 RDX: 00007f9512bdc606 RSI: 0000000000000000 RDI: 0000000020000e00 RBP: 00007f9512c8c6d0 R08: 00007ffe09e1cab7 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9512c8c6dc R13: 000000000000006e R14: 00007ffe09e1c9d0 R15: 00007ffe09e1cab8 Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:exfat_get_dentry_cached+0x11a/0x1b0 fs/exfat/dir.c:727 Code: df 48 89 da 48 c1 ea 03 80 3c 02 00 0f 85 9d 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8b 1b 48 8d 7b 28 48 89 fa 48 c1 ea 03 <80> 3c 02 00 75 61 49 8d 7d 18 48 8b 43 28 48 ba 00 00 00 00 00 fc RSP: 0018:ffffc900032df378 EFLAGS: 00010216 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000009 RDX: 0000000000000005 RSI: ffffffff82705916 RDI: 0000000000000028 RBP: 0000000000000200 R08: 0000000000000001 R09: 000000000000001f R10: 0000000000000009 R11: 0000000000000003 R12: ffffc900032df4a0 R13: ffff8880350f6000 R14: 0000000000000009 R15: 0000000000000010 FS: 00007f9512b986c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000055ea395f6818 CR3: 000000007542e000 CR4: 0000000000350ef0 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 48 89 da mov %rbx,%rdx 3: 48 c1 ea 03 shr $0x3,%rdx 7: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) b: 0f 85 9d 00 00 00 jne 0xae 11: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 18: fc ff df 1b: 48 8b 1b mov (%rbx),%rbx 1e: 48 8d 7b 28 lea 0x28(%rbx),%rdi 22: 48 89 fa mov %rdi,%rdx 25: 48 c1 ea 03 shr $0x3,%rdx * 29: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) <-- trapping instruction 2d: 75 61 jne 0x90 2f: 49 8d 7d 18 lea 0x18(%r13),%rdi 33: 48 8b 43 28 mov 0x28(%rbx),%rax 37: 48 rex.W 38: ba 00 00 00 00 mov $0x0,%edx 3d: 00 fc add %bh,%ah --- 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.