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Sat, 10 Aug 2024 19:16:20 -0700 (PDT) Date: Sat, 10 Aug 2024 19:16:20 -0700 In-Reply-To: <0000000000006fc563061cbc7f9c@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <0000000000005cea8e061f5ef6da@google.com> Subject: Re: [syzbot] [jfs?] UBSAN: shift-out-of-bounds in dbFindBits From: syzbot To: andrew.kanner@gmail.com, ghandatmanas@gmail.com, jfs-discussion@lists.sourceforge.net, juntong.deng@outlook.com, linux-kernel-mentees@lists.linuxfoundation.org, linux-kernel@vger.kernel.org, osmtendev@gmail.com, rbrasga@uci.edu, shaggy@kernel.org, skhan@linuxfoundation.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 34ac1e82e5a7 Merge tag '6.11-rc2-smb3-client-fixes' of git.. git tree: upstream console+strace: https://syzkaller.appspot.com/x/log.txt?x=15f035d9980000 kernel config: https://syzkaller.appspot.com/x/.config?x=9358cc4a2e37fd30 dashboard link: https://syzkaller.appspot.com/bug?extid=e38d703eeb410b17b473 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=161cc96d980000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=15f899d9980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/2c13802fbda4/disk-34ac1e82.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/74423353023b/vmlinux-34ac1e82.xz kernel image: https://storage.googleapis.com/syzbot-assets/61da8b25f42a/bzImage-34ac1e82.xz mounted in repro #1: https://storage.googleapis.com/syzbot-assets/4d2d380a51d6/mount_0.gz mounted in repro #2: https://storage.googleapis.com/syzbot-assets/53f5a740bbef/mount_2.gz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+e38d703eeb410b17b473@syzkaller.appspotmail.com ERROR: (device loop0): remounting filesystem as read-only jfs_rename: dtInsert returned -EIO ERROR: (device loop0): dbAllocBits: leaf page corrupt ------------[ cut here ]------------ UBSAN: shift-out-of-bounds in fs/jfs/jfs_dmap.c:3025:47 shift exponent 32 is too large for 32-bit type 'u32' (aka 'unsigned int') CPU: 0 UID: 0 PID: 5213 Comm: syz-executor267 Not tainted 6.11.0-rc2-syzkaller-00239-g34ac1e82e5a7 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/27/2024 Call Trace: __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_shift_out_of_bounds+0x3c8/0x420 lib/ubsan.c:468 dbFindBits+0x11a/0x1d0 fs/jfs/jfs_dmap.c:3025 dbAllocDmapLev+0x1e9/0x4a0 fs/jfs/jfs_dmap.c:1985 dbAllocCtl+0x113/0x920 fs/jfs/jfs_dmap.c:1825 dbAllocAG+0x28f/0x10b0 fs/jfs/jfs_dmap.c:1364 dbDiscardAG+0x352/0xa20 fs/jfs/jfs_dmap.c:1613 jfs_ioc_trim+0x433/0x670 fs/jfs/jfs_discard.c:100 jfs_ioctl+0x2d0/0x3e0 fs/jfs/ioctl.c:131 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:893 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: 0033:0x7fbb2632d059 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffe933950b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fbb26376095 RCX: 00007fbb2632d059 RDX: 0000000020000080 RSI: 00000000c0185879 RDI: 0000000000000006 RBP: 00007fbb263a85f0 R08: 000055555ee264c0 R09: 000055555ee264c0 R10: 000055555ee264c0 R11: 0000000000000246 R12: 00007ffe933950e0 R13: 00007ffe93395308 R14: 431bde82d7b634db R15: 00007fbb2637603b ---[ end trace ]--- --- 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.