BUG: unable to handle kernel paging request in ext4_ext_remove_space

[cheung wall]

Hello,


when using Healer to fuzz the latest Linux Kernel, the following crash

was triggered on:


HEAD commit: 0dd3ee31125508cd67f7e7172247f05b7fd1753a  (tag: v6.7)

git tree: upstream

console output: https://pastebin.com/raw/dtWhAR8Y

kernel config: https://pastebin.com/raw/dRctH7sr

C reproducer: https://pastebin.com/raw/zUiGyNi9

Syzlang reproducer:https://pastebin.com/raw/PNyeDjq6

If you fix this issue, please add the following tag to the commit:

Reported-by: Qiang Zhang <zzqq0103.hey@xxxxxxxxx>

----------------------------------------------------------

EXT4-fs (loop0): mounted filesystem
00000000-0000-0000-0000-000000000000 r/w without journal. Quota mode:
writeback.
ext4 filesystem being mounted at /syzkaller.TPYs2I/19/file1 supports
timestamps until 2038-01-19 (0x7fffffff)
BUG: unable to handle page fault for address: ffff888002cba000
#PF: supervisor write access in kernel mode
#PF: error_code(0x0003) - permissions violation
PGD a4c01067 P4D a4c01067 PUD a4c02067 PMD 2c63063 PTE 8000000002cba121
Oops: 0003 [#1] PREEMPT SMP KASAN NOPTI
CPU: 2 PID: 366 Comm: syz-executor127 Not tainted 6.7.0 #2
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014
RIP: 0010:memmove+0x1e/0x1b0
root/zhangqiang/kernel_fuzzing/zq-LLM-OS/llm-syz-environment/linux-6.7/arch/x86/lib/memmove_64.S:44
Code: 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 89 f8 48 39
fe 7d 0f 49 89 f0 49 01 d0 49 39 f8 0f 8f b5 00 00 00 48 89 d1 <f3> a4
e9 26 14 1b 00 66 2e 0f 1f 84 00 00 00 00 00 48 81 fa a8 02
RSP: 0018:ffff88800d84f840 EFLAGS: 00010216
RAX: ffff888002c9903c RBX: ffff888002c99000 RCX: fffffffffffdf000
RDX: ffffffffffffffc4 RSI: ffff888002cba00c RDI: ffff888002cba000
RBP: ffff888002c99002 R08: 0000000000000001 R09: fffff94000039076
R10: 0000000000000000 R11: 0000000000000000 R12: dffffc0000000000
R13: ffff88800ba37868 R14: ffff888002c99040 R15: 0000000000000004
FS:  00007fefc4cb4640(0000) GS:ffff88809e900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffff888002cba000 CR3: 00000000092fc005 CR4: 0000000000770ef0
PKRU: 55555554
Call Trace:
 <TASK>
 ext4_ext_rm_leaf
root/zhangqiang/kernel_fuzzing/zq-LLM-OS/llm-syz-environment/linux-6.7/fs/ext4/extents.c:2736
[inline]
 ext4_ext_remove_space+0x1aae/0x36b0
root/zhangqiang/kernel_fuzzing/zq-LLM-OS/llm-syz-environment/linux-6.7/fs/ext4/extents.c:2958
 ext4_punch_hole+0xb8b/0xe50
root/zhangqiang/kernel_fuzzing/zq-LLM-OS/llm-syz-environment/linux-6.7/fs/ext4/inode.c:4019
 ext4_fallocate+0xb68/0x3230
root/zhangqiang/kernel_fuzzing/zq-LLM-OS/llm-syz-environment/linux-6.7/fs/ext4/extents.c:4707
 vfs_fallocate+0x361/0xae0
root/zhangqiang/kernel_fuzzing/zq-LLM-OS/llm-syz-environment/linux-6.7/fs/open.c:324
 ioctl_preallocate+0x172/0x1f0
root/zhangqiang/kernel_fuzzing/zq-LLM-OS/llm-syz-environment/linux-6.7/fs/ioctl.c:291
 file_ioctl root/zhangqiang/kernel_fuzzing/zq-LLM-OS/llm-syz-environment/linux-6.7/fs/ioctl.c:334
[inline]
 do_vfs_ioctl+0x109e/0x13c0
root/zhangqiang/kernel_fuzzing/zq-LLM-OS/llm-syz-environment/linux-6.7/fs/ioctl.c:850
 __do_sys_ioctl
root/zhangqiang/kernel_fuzzing/zq-LLM-OS/llm-syz-environment/linux-6.7/fs/ioctl.c:869
[inline]
 __se_sys_ioctl
root/zhangqiang/kernel_fuzzing/zq-LLM-OS/llm-syz-environment/linux-6.7/fs/ioctl.c:857
[inline]
 __x64_sys_ioctl+0xef/0x1e0
root/zhangqiang/kernel_fuzzing/zq-LLM-OS/llm-syz-environment/linux-6.7/fs/ioctl.c:857
 do_syscall_x64
root/zhangqiang/kernel_fuzzing/zq-LLM-OS/llm-syz-environment/linux-6.7/arch/x86/entry/common.c:52
[inline]
 do_syscall_64+0x46/0xf0
root/zhangqiang/kernel_fuzzing/zq-LLM-OS/llm-syz-environment/linux-6.7/arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x6f/0x77
RIP: 0033:0x7fefc4d3263d
Code: c3 e8 27 23 00 00 0f 1f 80 00 00 00 00 f3 0f 1e fa 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:00007fefc4cb4198 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fefc4dc95d0 RCX: 00007fefc4d3263d
RDX: 0000000020000080 RSI: 0000000040305829 RDI: 0000000000000004
RBP: 00007fefc4d93598 R08: 00007ffe5e3ab7bf R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0031656c69662f2e
R13: 6f6f6c2f7665642f R14: 000001ff7fdfd000 R15: 00007fefc4dc95d8
 </TASK>
Modules linked in:
CR2: ffff888002cba000
---[ end trace 0000000000000000 ]---
BUG: unable to handle page fault for address: ffffebde001bf808
RIP: 0010:memmove+0x1e/0x1b0
root/zhangqiang/kernel_fuzzing/zq-LLM-OS/llm-syz-environment/linux-6.7/arch/x86/lib/memmove_64.S:44
#PF: supervisor read access in kernel mode
Code: 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 48 89 f8 48 39
fe 7d 0f 49 89 f0 49 01 d0 49 39 f8 0f 8f b5 00 00 00 48 89 d1 <f3> a4
e9 26 14 1b 00 66 2e 0f 1f 84 00 00 00 00 00 48 81 fa a8 02
#PF: error_code(0x0000) - not-present page
RSP: 0018:ffff88800d84f840 EFLAGS: 00010216
PGD 0 P4D 0