[syzbot] [mm?] kernel BUG in validate_mm (2)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: a901a3568fd2 Merge tag 'iomap-6.5-merge-1' of git://git.ke..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=179c302ca80000
kernel config: https://syzkaller.appspot.com/x/.config?x=f5e1158c5b2f83bb
dashboard link: https://syzkaller.appspot.com/bug?extid=70b97abe3e253d1c3f8e
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1511d490a80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=130e5cfb280000

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/07a995e5618a/disk-a901a356.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/ad2efb29f1e0/vmlinux-a901a356.xz
kernel image: https://storage.googleapis.com/syzbot-assets/74fa7ac85d25/bzImage-a901a356.xz
mounted in repro: https://storage.googleapis.com/syzbot-assets/77e05f49bdce/mount_0.gz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+70b97a...@syzkaller.appspotmail.com

start_code 7f8413e4b000 end_code 7f8413ee5b31 start_data 7f8413f13e50 end_data 7f8413f193b0
start_brk 5555561bf000 brk 5555561e1000 start_stack 7fffb37e2480
arg_start 7fffb37e2efb arg_end 7fffb37e2f14 env_start 7fffb37e2f14 env_end 7fffb37e2fdf
binfmt ffffffff8cba2c20 flags 7fd
ioctx_table 0000000000000000
owner ffff88802a200000 exe_file ffff88802a0d0a00
notifier_subscriptions 0000000000000000
numa_next_scan 4294941906 numa_scan_offset 0 numa_scan_seq 0
tlb_flush_pending 0
def_flags: 0x0()
------------[ cut here ]------------
kernel BUG at mm/mmap.c:340!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 6821 Comm: syz-executor191 Not tainted 6.4.0-syzkaller-10173-ga901a3568fd2 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023
RIP: 0010:validate_mm+0x3a0/0x470 mm/mmap.c:340
Code: 24 48 e8 93 39 fb ff e9 fc fd ff ff e8 09 e1 be ff 44 89 fa 89 ee 48 c7 c7 a0 d3 78 8a e8 88 89 a2 ff 48 89 df e8 a0 17 fb ff <0f> 0b e8 e9 e0 be ff 48 8b 7c 24 18 e8 8f 17 fb ff c6 05 34 fa cd
RSP: 0018:ffffc9000c297aa0 EFLAGS: 00010282
RAX: 000000000000032f RBX: ffff888078fa0000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8169097c RDI: 0000000000000005
RBP: 0000000000000013 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: 00007fffb37f9000
R13: 0000000000000000 R14: 00007fffb37fafff R15: 0000000000000012
FS: 00007f8413e41700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f840b9ff718 CR3: 000000001bb00000 CR4: 0000000000350ee0
Call Trace:
<TASK>
do_vmi_align_munmap+0x1199/0x1680 mm/mmap.c:2561
do_vmi_munmap+0x266/0x430 mm/mmap.c:2619
__vm_munmap+0x137/0x380 mm/mmap.c:2899
__do_sys_munmap mm/mmap.c:2916 [inline]
__se_sys_munmap mm/mmap.c:2913 [inline]
__x64_sys_munmap+0x62/0x80 mm/mmap.c:2913
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f8413e94f97
Code: 00 00 00 48 c7 c2 b8 ff ff ff f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb 85 66 2e 0f 1f 84 00 00 00 00 00 90 b8 0b 00 00 00 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:00007f8413e41168 EFLAGS: 00000246 ORIG_RAX: 000000000000000b
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f8413e94f97
RDX: 0000000000010000 RSI: 0000000000010000 RDI: 00007f840ba00000
RBP: 00007f840ba00000 R08: 0000000000000000 R09: 000000000000028b
R10: 0000000000010000 R11: 0000000000000246 R12: 00007f8413e416b8
R13: 00007f8413e41180 R14: 00007f8413e411c0 R15: 00007f8413f196e8
</TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:validate_mm+0x3a0/0x470 mm/mmap.c:340
Code: 24 48 e8 93 39 fb ff e9 fc fd ff ff e8 09 e1 be ff 44 89 fa 89 ee 48 c7 c7 a0 d3 78 8a e8 88 89 a2 ff 48 89 df e8 a0 17 fb ff <0f> 0b e8 e9 e0 be ff 48 8b 7c 24 18 e8 8f 17 fb ff c6 05 34 fa cd
RSP: 0018:ffffc9000c297aa0 EFLAGS: 00010282
RAX: 000000000000032f RBX: ffff888078fa0000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8169097c RDI: 0000000000000005
RBP: 0000000000000013 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000080000000 R11: 0000000000000001 R12: 00007fffb37f9000
R13: 0000000000000000 R14: 00007fffb37fafff R15: 0000000000000012
FS: 00007f8413e41700(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffb37e2238 CR3: 000000001bb00000 CR4: 0000000000350ee0


---
This report is generated by a bot. It may contain errors.
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If the bug is already fixed, 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.

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(See the list of subsystem names on the web dashboard)

If the bug is a duplicate of another bug, reply with:
#syz dup: exact-subject-of-another-report

If you want to undo deduplication, reply with:
#syz undup

[syzbot]

syzbot suspects this issue was fixed by commit:

commit ef513aa7aa5038d2f53e9f2932af5006f37ed0b6
Author: Luca Weiss <lu...@z3ntu.xyz>
Date: Thu Apr 13 23:17:49 2023 +0000

dt-bindings: iio: adc: qcom,spmi-vadc: Allow 1/16 for pre-scaling

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=11aeb085a80000
start commit: a901a3568fd2 Merge tag 'iomap-6.5-merge-1' of git://git.ke..
git tree: upstream

kernel config: https://syzkaller.appspot.com/x/.config?x=f5e1158c5b2f83bb
dashboard link: https://syzkaller.appspot.com/bug?extid=70b97abe3e253d1c3f8e

syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1511d490a80000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=130e5cfb280000

If the result looks correct, please mark the issue as fixed by replying with:

#syz fix: dt-bindings: iio: adc: qcom,spmi-vadc: Allow 1/16 for pre-scaling

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

[Hillf Danton]

On Wed, 05 Jul 2023 13:37:52 -0700

> HEAD commit: a901a3568fd2 Merge tag 'iomap-6.5-merge-1' of git://git.ke..
> git tree: upstream

> C reproducer: https://syzkaller.appspot.com/x/repro.c?x=130e5cfb280000

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master

[syzbot]

Hello,

syzbot has tested the proposed patch and the reproducer did not trigger any issue:

Reported-and-tested-by: syzbot+70b97a...@syzkaller.appspotmail.com

Tested on:

commit: f7dc24b3 Add linux-next specific files for 20230807
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
console output: https://syzkaller.appspot.com/x/log.txt?x=123794dda80000
kernel config: https://syzkaller.appspot.com/x/.config?x=81f901dcd08ced60
dashboard link: https://syzkaller.appspot.com/bug?extid=70b97abe3e253d1c3f8e
compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Note: no patches were applied.
Note: testing is done by a robot and is best-effort only.

[Aleksandr Nogikh]

No, that's wrong. Please ignore the email.

[Aleksandr Nogikh]

#syz fix: mm: validate the mm before dropping the mmap lock