From: syzbot <syzbot+283ce5a46486d6acdbaf@syzkaller.appspotmail.com>
To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk
Subject: [syzbot] KASAN: null-ptr-deref Read in filp_close (2)
Date: Fri, 26 Mar 2021 00:55:18 -0700 [thread overview]
Message-ID: <00000000000069c40405be6bdad4@google.com> (raw)
Hello,
syzbot found the following issue on:
HEAD commit: 5ee96fa9 Merge tag 'irq-urgent-2021-03-21' of git://git.ke..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=17fb84bed00000
kernel config: https://syzkaller.appspot.com/x/.config?x=6abda3336c698a07
dashboard link: https://syzkaller.appspot.com/bug?extid=283ce5a46486d6acdbaf
Unfortunately, I don't have any reproducer for this issue yet.
IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+283ce5a46486d6acdbaf@syzkaller.appspotmail.com
==================================================================
BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:71 [inline]
BUG: KASAN: null-ptr-deref in atomic64_read include/asm-generic/atomic-instrumented.h:837 [inline]
BUG: KASAN: null-ptr-deref in atomic_long_read include/asm-generic/atomic-long.h:29 [inline]
BUG: KASAN: null-ptr-deref in filp_close+0x22/0x170 fs/open.c:1289
Read of size 8 at addr 0000000000000077 by task syz-executor.4/16965
CPU: 0 PID: 16965 Comm: syz-executor.4 Not tainted 5.12.0-rc3-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
__dump_stack lib/dump_stack.c:79 [inline]
dump_stack+0x141/0x1d7 lib/dump_stack.c:120
__kasan_report mm/kasan/report.c:403 [inline]
kasan_report.cold+0x5f/0xd8 mm/kasan/report.c:416
check_region_inline mm/kasan/generic.c:180 [inline]
kasan_check_range+0x13d/0x180 mm/kasan/generic.c:186
instrument_atomic_read include/linux/instrumented.h:71 [inline]
atomic64_read include/asm-generic/atomic-instrumented.h:837 [inline]
atomic_long_read include/asm-generic/atomic-long.h:29 [inline]
filp_close+0x22/0x170 fs/open.c:1289
close_files fs/file.c:403 [inline]
put_files_struct fs/file.c:418 [inline]
put_files_struct+0x1d0/0x350 fs/file.c:415
exit_files+0x7e/0xa0 fs/file.c:435
do_exit+0xbc2/0x2a60 kernel/exit.c:820
do_group_exit+0x125/0x310 kernel/exit.c:922
get_signal+0x42c/0x2100 kernel/signal.c:2773
arch_do_signal_or_restart+0x2a8/0x1eb0 arch/x86/kernel/signal.c:789
handle_signal_work kernel/entry/common.c:147 [inline]
exit_to_user_mode_loop kernel/entry/common.c:171 [inline]
exit_to_user_mode_prepare+0x148/0x250 kernel/entry/common.c:208
__syscall_exit_to_user_mode_work kernel/entry/common.c:290 [inline]
syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:301
entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x466459
Code: Unable to access opcode bytes at RIP 0x46642f.
RSP: 002b:00007feb5e334218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 000000000056bf68 RCX: 0000000000466459
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 000000000056bf68
RBP: 000000000056bf60 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf6c
R13: 0000000000a9fb1f R14: 00007feb5e334300 R15: 0000000000022000
==================================================================
---
This report is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
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next reply other threads:[~2021-03-26 7:56 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-26 7:55 syzbot [this message]
2021-03-26 8:02 ` [syzbot] KASAN: null-ptr-deref Read in filp_close (2) Dmitry Vyukov
2021-03-26 9:12 ` Christian Brauner
2021-03-26 9:21 ` Dmitry Vyukov
[not found] ` <CAHrFyr7iUpMh4sicxrMWwaUHKteU=qHt-1O-3hojAAX3d5879Q@mail.gmail.com>
2021-03-26 13:50 ` Christian Brauner
2021-03-26 14:22 ` Dmitry Vyukov
2021-03-27 23:33 ` Al Viro
2021-03-29 9:21 ` Christian Brauner
2021-03-29 17:35 ` Christian Brauner
2021-04-02 12:35 ` [PATCH 0/3] file: fix and simplify close_range() Christian Brauner
2021-04-02 12:35 ` [PATCH 1/3] file: fix close_range() for unshare+cloexec Christian Brauner
2021-04-02 12:35 ` [PATCH 2/3] file: let pick_file() tell caller it's done Christian Brauner
2021-04-02 12:35 ` [PATCH 3/3] file: simplify logic in __close_range() Christian Brauner
2021-07-13 4:12 ` [syzbot] KASAN: null-ptr-deref Read in filp_close (2) syzbot
2021-07-13 18:49 ` Linus Torvalds
2021-07-14 7:59 ` Christian Brauner
2021-07-14 9:14 ` Christian Brauner
2021-07-14 11:45 ` Dmitry Vyukov
2021-07-14 13:51 ` Christian Brauner
2021-07-14 13:54 ` syzbot
2021-07-14 13:57 ` Christian Brauner
2021-07-14 14:16 ` syzbot
2021-07-14 13:53 ` Christian Brauner
2021-07-14 13:53 ` syzbot
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