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* WARNING in __kernel_read
@ 2021-10-06  9:33 Hao Sun
  2021-10-06 12:17 ` Matthew Wilcox
  0 siblings, 1 reply; 9+ messages in thread
From: Hao Sun @ 2021-10-06  9:33 UTC (permalink / raw)
  To: Linux Kernel Mailing List, linux-fsdevel, viro

Hello,

When using Healer to fuzz the latest Linux kernel, the following crash
was triggered.

HEAD commit: 0513e464f900 Merge tag 'perf-tools-fixes-for-v5.15-2021-09-27'
git tree: upstream
console output:
https://drive.google.com/file/d/1RomE2Ls4uFB-AfgRtQr6739q4npqS-_Y/view?usp=sharing
kernel config: https://drive.google.com/file/d/1Jqhc4DpCVE8X7d-XBdQnrMoQzifTG5ho/view?usp=sharing
C reproducer: https://drive.google.com/file/d/1RzAsyIZzw5X_m340nY9fu4KWjGdG98pv/view?usp=sharing
Syzlang reproducer:
https://drive.google.com/file/d/1QqdmE15ktTdJIQK9s6u-btC5YuajI9XH/view?usp=sharing

If you fix this issue, please add the following tag to the commit:
Reported-by: Hao Sun <sunhao.th@gmail.com>

------------[ cut here ]------------
WARNING: CPU: 1 PID: 28082 at fs/read_write.c:429
__kernel_read+0x3bb/0x410 fs/read_write.c:429
Modules linked in:
CPU: 1 PID: 28082 Comm: syz-executor Not tainted 5.15.0-rc3+ #21
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.12.0-59-gc9ba5276e321-prebuilt.qemu.org 04/01/2014
RIP: 0010:__kernel_read+0x3bb/0x410 fs/read_write.c:429
Code: 8b 04 25 40 70 01 00 8b 88 60 05 00 00 4c 8d 80 c8 07 00 00 e8
88 c7 c6 02 48 c7 c5 ea ff ff ff e9 6a fe ff ff e8 65 cf dd ff <0f> 0b
48 c7 c5 ea ff ff ff e9 57 fe ff ff e8 52 cf dd ff b9 01 00
RSP: 0018:ffffc900025e7cf8 EFLAGS: 00010216
RAX: 00000000000081cb RBX: ffff888109c16c00 RCX: ffffc90002c55000
RDX: 0000000000040000 RSI: ffffffff8159c1fb RDI: ffff888109c16c00
RBP: 000000004808801c R08: 0000000000000000 R09: 0000000000000000
R10: ffffc900025e7d40 R11: 0000000000000000 R12: ffffc9000f315000
R13: ffffc900025e7df8 R14: 0000000000206590 R15: ffffc9000f315000
FS:  00007f55dbd06700(0000) GS:ffff88813dc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000003 CR3: 000000001a3ac000 CR4: 0000000000752ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000003
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
PKRU: 55555554
Call Trace:
 kernel_read+0x47/0x60 fs/read_write.c:461
 kernel_read_file+0x20a/0x370 fs/kernel_read_file.c:93
 kernel_read_file_from_fd+0x55/0x90 fs/kernel_read_file.c:184
 __do_sys_finit_module+0x89/0x110 kernel/module.c:4180
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x34/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x46ae99
Code: f7 d8 64 89 02 b8 ff ff ff ff c3 66 0f 1f 44 00 00 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f55dbd05c48 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
RAX: ffffffffffffffda RBX: 000000000078c0a0 RCX: 000000000046ae99
RDX: 0000000000000003 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 00000000004e4809 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000078c0a0
R13: 0000000000000000 R14: 000000000078c0a0 R15: 00007ffeee82e7a0

^ permalink raw reply	[flat|nested] 9+ messages in thread
* WARNING in __kernel_read
@ 2020-07-13  7:03 syzbot
  2020-07-14 11:02 ` Christoph Hellwig
  0 siblings, 1 reply; 9+ messages in thread
From: syzbot @ 2020-07-13  7:03 UTC (permalink / raw)
  To: hch, linux-fsdevel, linux-kernel, syzkaller-bugs, viro

Hello,

syzbot found the following crash on:

HEAD commit:    a581387e Merge tag 'io_uring-5.8-2020-07-10' of git://git...
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=13e730eb100000
kernel config:  https://syzkaller.appspot.com/x/.config?x=66ad203c2bb6d8b
dashboard link: https://syzkaller.appspot.com/bug?extid=d012ca3f813739c37c25
compiler:       gcc (GCC) 10.1.0-syz 20200507
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12e0222b100000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=162a004f100000

The bug was bisected to:

commit 6209dd9132e8ea5545cffc84483841e88ea8cc5b
Author: Christoph Hellwig <hch@lst.de>
Date:   Fri May 8 07:00:28 2020 +0000

    fs: implement kernel_read using __kernel_read

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=152d91fb100000
final crash:    https://syzkaller.appspot.com/x/report.txt?x=172d91fb100000
console output: https://syzkaller.appspot.com/x/log.txt?x=132d91fb100000

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+d012ca3f813739c37c25@syzkaller.appspotmail.com
Fixes: 6209dd9132e8 ("fs: implement kernel_read using __kernel_read")

------------[ cut here ]------------
WARNING: CPU: 0 PID: 5 at fs/read_write.c:427 __kernel_read+0x41d/0x4d0 fs/read_write.c:427
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 5 Comm: kworker/0:0 Not tainted 5.8.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events p9_read_work
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x18f/0x20d lib/dump_stack.c:118
 panic+0x2e3/0x75c kernel/panic.c:231
 __warn.cold+0x20/0x45 kernel/panic.c:600
 report_bug+0x1bd/0x210 lib/bug.c:198
 handle_bug+0x38/0x90 arch/x86/kernel/traps.c:235
 exc_invalid_op+0x13/0x40 arch/x86/kernel/traps.c:255
 asm_exc_invalid_op+0x12/0x20 arch/x86/include/asm/idtentry.h:542
RIP: 0010:__kernel_read+0x41d/0x4d0 fs/read_write.c:427
Code: fd ff ff e8 75 19 b6 ff 45 31 c9 45 31 c0 b9 01 00 00 00 4c 89 f2 89 ee 4c 89 ef e8 5d 22 12 00 e9 46 ff ff ff e8 53 19 b6 ff <0f> 0b 49 c7 c4 ea ff ff ff e9 11 fe ff ff 4c 89 f7 e8 2d 76 f5 ff
RSP: 0018:ffffc90000cbfbc8 EFLAGS: 00010293
RAX: 0000000000000000 RBX: ffff8880a9786ac0 RCX: ffffffff81bd9ac4
RDX: ffff8880a95a2140 RSI: ffffffff81bd9e3d RDI: 0000000000000005
RBP: ffff888096bc8060 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 1ffffffff1829bdd R12: 00000000081d801e
R13: ffffc90000cbfc98 R14: ffff8880a9786b44 R15: 0000000000000007
 kernel_read+0x52/0x70 fs/read_write.c:457
 p9_fd_read net/9p/trans_fd.c:263 [inline]
 p9_read_work+0x2ac/0xff0 net/9p/trans_fd.c:298
 process_one_work+0x94c/0x1670 kernel/workqueue.c:2269
 worker_thread+0x64c/0x1120 kernel/workqueue.c:2415
 kthread+0x3b5/0x4a0 kernel/kthread.c:291
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:293
Kernel Offset: disabled
Rebooting in 86400 seconds..


---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzkaller@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
For information about bisection process see: https://goo.gl/tpsmEJ#bisection
syzbot can test patches for this bug, for details see:
https://goo.gl/tpsmEJ#testing-patches

^ permalink raw reply	[flat|nested] 9+ messages in thread

end of thread, other threads:[~2021-10-12  6:21 UTC | newest]

Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-10-06  9:33 WARNING in __kernel_read Hao Sun
2021-10-06 12:17 ` Matthew Wilcox
2021-10-06 13:57   ` Theodore Ts'o
2021-10-06 22:10     ` Kees Cook
2021-10-12  6:21   ` Christoph Hellwig
  -- strict thread matches above, loose matches on Subject: below --
2020-07-13  7:03 syzbot
2020-07-14 11:02 ` Christoph Hellwig
2020-07-23 14:17   ` Cengiz Can
2020-07-23 15:51     ` Eric Biggers

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