linux-kernel - Re: WARNING: bad usercopy in fanotify

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Message-ID: <0000000000008f302105843741ad@google.com>
Date:   Sat, 16 Mar 2019 07:49:01 -0700
From:   syzbot <syzbot+2c49971e251e36216d1f@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, amir73il@...il.com, cai@....pw,
        crecklin@...hat.com, jack@...e.cz, keescook@...omium.org,
        linux-api@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        syzkaller-bugs@...glegroups.com
Subject: Re: WARNING: bad usercopy in fanotify_read

syzbot has bisected this bug to:

commit a8b13aa20afb69161b5123b4f1acc7ea0a03d360
Author: Amir Goldstein <amir73il@...il.com>
Date:   Thu Jan 10 17:04:36 2019 +0000

     fanotify: enable FAN_REPORT_FID init flag

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=11e78d6f200000
start commit:   a8b13aa2 fanotify: enable FAN_REPORT_FID init flag
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=13e78d6f200000
console output: https://syzkaller.appspot.com/x/log.txt?x=15e78d6f200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=e9d91b7192a5e96e
dashboard link: https://syzkaller.appspot.com/bug?extid=2c49971e251e36216d1f
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1287516f200000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17ee410b200000

Reported-by: syzbot+2c49971e251e36216d1f@...kaller.appspotmail.com
Fixes: a8b13aa2 ("fanotify: enable FAN_REPORT_FID init flag")