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UBSAN: shift-out-of-bounds in minix_statfs

Status: upstream: reported C repro on 2021/12/13 07:17
Reported-by: syzbot+5ad0824204c7bf9b67f2@syzkaller.appspotmail.com
First crash: 363d, last: 4d23h

Cause bisection: the issue happens on the oldest tested release (bisect log)
Crash: UBSAN: shift-out-of-bounds in minix_statfs (log)
Repro: C syz .config
Patch testing requests:
Created Duration User Patch Repo Result
2022/05/10 02:55 8m wanngchenng@gmail.com https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ master report log
2022/05/01 01:41 8m (218) wanngchenng@gmail.com https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ master report log
2022/04/30 10:13 11m (10) wanngchenng@gmail.com https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/ master error

Sample crash report:
loop0: detected capacity change from 0 to 256
================================================================================
UBSAN: shift-out-of-bounds in fs/minix/inode.c:380:57
shift exponent 1792 is too large for 64-bit type 'unsigned long'
CPU: 0 PID: 3631 Comm: syz-executor154 Not tainted 6.1.0-rc7-syzkaller-00200-gc2bf05db6c78 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x1b1/0x28e lib/dump_stack.c:106
 ubsan_epilogue lib/ubsan.c:151 [inline]
 __ubsan_handle_shift_out_of_bounds+0x33d/0x3b0 lib/ubsan.c:322
 minix_statfs+0x363/0x370 fs/minix/inode.c:380
 statfs_by_dentry fs/statfs.c:66 [inline]
 vfs_statfs+0x136/0x310 fs/statfs.c:90
 ovl_check_namelen fs/overlayfs/super.c:916 [inline]
 ovl_get_upper+0x13a/0x5d0 fs/overlayfs/super.c:1221
 ovl_fill_super+0x1522/0x2790 fs/overlayfs/super.c:2076
 mount_nodev+0x52/0xe0 fs/super.c:1447
 legacy_get_tree+0xea/0x180 fs/fs_context.c:610
 vfs_get_tree+0x88/0x270 fs/super.c:1531
 do_new_mount+0x289/0xad0 fs/namespace.c:3040
 do_mount fs/namespace.c:3383 [inline]
 __do_sys_mount fs/namespace.c:3591 [inline]
 __se_sys_mount+0x2d3/0x3c0 fs/namespace.c:3568
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7fa5c598c7e9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 51 14 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 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe7c70f338 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fa5c598c7e9
RDX: 0000000020000080 RSI: 0000000020000040 RDI: 0000000000000000
RBP: 00007fa5c594c080 R08: 0000000020000340 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fa5c594c110
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
================================================================================

Fix bisection attempts:
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci-upstream-kasan-gce-selinux-root 2022/08/23 18:45 upstream 072e51356cd5 a5dbd430 .config log report syz C
ci-upstream-kasan-gce-selinux-root 2022/07/24 18:24 upstream af2c9ac24019 a5dbd430 .config log report syz C
ci-upstream-kasan-gce-smack-root 2022/06/14 07:17 upstream b13baccc3850 744a39e2 .config log report syz C
ci-upstream-kasan-gce-root 2022/05/10 00:18 upstream 9be9ed2612b5 97582466 .config log report syz C
ci-upstream-kasan-gce-root 2022/03/13 13:19 upstream aad611a868d1 49ca1f59 .config log report syz C
ci-upstream-kasan-gce-root 2022/01/11 04:29 upstream 63045bfd3c8d 49ca1f59 .config log report syz C
* Struck through repros no longer work on HEAD.
Crashes (31):
Manager Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Title
ci2-upstream-fs 2022/12/05 03:38 upstream c2bf05db6c78 e080de16 .config log report syz C UBSAN: shift-out-of-bounds in minix_statfs
ci-upstream-kasan-gce-root 2022/10/13 21:59 upstream 55be6084c8e0 adf90437 .config log report syz C UBSAN: shift-out-of-bounds in minix_statfs
ci2-upstream-fs 2022/10/05 09:02 upstream 0326074ff465 267e3bb1 .config log report syz C UBSAN: shift-out-of-bounds in minix_statfs
ci-upstream-kasan-gce-selinux-root 2022/06/24 17:17 upstream 92f20ff72066 a5dbd430 .config log report syz C UBSAN: shift-out-of-bounds in minix_statfs
ci-upstream-kasan-gce-smack-root 2022/05/15 06:54 upstream 2fe1020d73ca 744a39e2 .config log report syz C UBSAN: shift-out-of-bounds in minix_statfs
ci-upstream-kasan-gce-root 2022/04/07 06:28 upstream 3e732ebf7316 97582466 .config log report syz C UBSAN: shift-out-of-bounds in minix_statfs
ci-upstream-kasan-gce-root 2021/12/11 09:47 upstream b8a98b6bf66a 49ca1f59 .config log report syz C UBSAN: shift-out-of-bounds in minix_statfs
ci-upstream-linux-next-kasan-gce-root 2022/05/13 23:41 linux-next 1e1b28b936ae 107f6434 .config log report syz C UBSAN: shift-out-of-bounds in minix_statfs
ci2-upstream-fs 2022/11/13 20:08 upstream af7a05689189 7ba4d859 .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci2-upstream-fs 2022/10/21 07:19 upstream 493ffd6605b2 a0fd4dab .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci-upstream-kasan-gce-smack-root 2022/10/14 17:31 upstream 55be6084c8e0 4954e4b2 .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci2-upstream-fs 2022/10/13 07:47 upstream 493ffd6605b2 3f6b40a1 .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci2-upstream-fs 2022/10/05 08:44 upstream 0326074ff465 267e3bb1 .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci2-upstream-fs 2022/09/28 13:54 upstream 46452d3786a8 75c78242 .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci2-upstream-fs 2022/09/27 13:12 upstream 3800a713b607 10323ddf .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci2-upstream-fs 2022/09/22 03:09 upstream 06f7db949993 60af5050 .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci-upstream-kasan-gce-root 2022/03/26 07:16 upstream 52d543b5497c 89bc8608 .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci-qemu-upstream 2022/03/24 20:45 upstream ed4643521e6a 89bc8608 .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci-upstream-kasan-gce-selinux-root 2022/03/24 20:41 upstream ed4643521e6a 89bc8608 .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci-upstream-kasan-gce-root 2022/03/24 20:40 upstream ed4643521e6a 89bc8608 .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci-upstream-kasan-gce-smack-root 2022/03/24 20:40 upstream ed4643521e6a 89bc8608 .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci-upstream-kasan-gce-smack-root 2022/02/08 07:47 upstream 555f3d7be91a a7dab638 .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci-upstream-kasan-gce-root 2021/12/11 09:24 upstream b8a98b6bf66a 49ca1f59 .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci-qemu-upstream-386 2022/03/24 20:43 upstream ed4643521e6a 89bc8608 .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci-upstream-linux-next-kasan-gce-root 2022/11/06 23:07 linux-next 0cdb3579f1ee 6d752409 .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci-upstream-linux-next-kasan-gce-root 2022/10/16 01:49 linux-next aaa11ce2ffc8 67cb024c .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci-upstream-linux-next-kasan-gce-root 2022/10/07 08:23 linux-next aaa11ce2ffc8 8a212197 .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci-upstream-linux-next-kasan-gce-root 2022/03/30 00:33 linux-next c2528a0cdebd 6bdac766 .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci-upstream-linux-next-kasan-gce-root 2022/03/24 20:40 linux-next dd315b580061 89bc8608 .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci-upstream-linux-next-kasan-gce-root 2022/02/11 12:54 linux-next ef6b35306dd8 0b33604d .config log report info UBSAN: shift-out-of-bounds in minix_statfs
ci-upstream-linux-next-kasan-gce-root 2021/12/12 04:09 linux-next ea922272cbe5 49ca1f59 .config log report info UBSAN: shift-out-of-bounds in minix_statfs
* Struck through repros no longer work on HEAD.