Re: [syzbot] KASAN: null-ptr-deref Read in filp_close (2)
From: Christian Brauner <hidden>
Date: 2021-07-14 13:58:03
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On Wed, Jul 14, 2021 at 03:51:57PM +0200, Christian Brauner wrote:
On Mon, Jul 12, 2021 at 09:12:20PM -0700, syzbot wrote:quoted
syzbot has found a reproducer for the following issue on: HEAD commit: 7fef2edf sd: don't mess with SD_MINORS for CONFIG_DEBUG_BL.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=178919b0300000 kernel config: https://syzkaller.appspot.com/x/.config?x=20276914ec6ad813 dashboard link: https://syzkaller.appspot.com/bug?extid=283ce5a46486d6acdbaf syz repro: https://syzkaller.appspot.com/x/repro.syz?x=120220f2300000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=115f37b4300000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+283ce5a46486d6acdbaf@syzkaller.appspotmail.com ================================================================== BUG: KASAN: use-after-free in instrument_atomic_read include/linux/instrumented.h:71 [inline] BUG: KASAN: use-after-free in atomic64_read include/asm-generic/atomic-instrumented.h:605 [inline] BUG: KASAN: use-after-free in atomic_long_read include/asm-generic/atomic-long.h:29 [inline] BUG: KASAN: use-after-free in filp_close+0x22/0x170 fs/open.c:1306 Read of size 8 at addr ffff888025a40a78 by task syz-executor493/8445#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/brauner/linux.git/ 595fac5cecba71935450ec431eb8dfa963cf45fe
Hm, git.kernel.org doesn't seem to have caught up. Let's try: #syz test: https://gitlab.com/brauner/linux.git 595fac5cecba71935450ec431eb8dfa963cf45fe