linux-kernel - Re: [syzbot] KASAN: use-after-free Read in __isofs

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Message-ID: <20211019091639.GE3255@quack2.suse.cz>
Date:   Tue, 19 Oct 2021 11:16:39 +0200
From:   Jan Kara <jack@...e.cz>
To:     syzbot <syzbot+6fc7fb214625d82af7d1@...kaller.appspotmail.com>
Cc:     bingjingc@...ology.com, cccheng@...ology.com, jack@...e.cz,
        linux-kernel@...r.kernel.org, pali@...nel.org,
        robbieko@...ology.com, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] KASAN: use-after-free Read in __isofs_iget

On Mon 18-10-21 12:42:13, Jan Kara wrote:
> On Fri 15-10-21 17:35:19, syzbot wrote:
> > Hello,
> > 
> > syzbot found the following issue on:
> > 
> > HEAD commit:    d3134eb5de85 Add linux-next specific files for 20211011
> > git tree:       linux-next
> > console output: https://syzkaller.appspot.com/x/log.txt?x=13f5fd98b00000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=b9662326d2be383b
> > dashboard link: https://syzkaller.appspot.com/bug?extid=6fc7fb214625d82af7d1
> > 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=15ca2e47300000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17869bd4b00000
> > 
> > Bisection is inconclusive: the issue happens on the oldest tested release.
> > 
> > bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=10808570b00000
> > final oops:     https://syzkaller.appspot.com/x/report.txt?x=12808570b00000
> > console output: https://syzkaller.appspot.com/x/log.txt?x=14808570b00000
> > 
> > IMPORTANT: if you fix the issue, please add the following tag to the commit:
> > Reported-by: syzbot+6fc7fb214625d82af7d1@...kaller.appspotmail.com
> 
> Let's try this:
> 
> #sys test 519d81956ee277b4419c723adfb154603c2565ba

Bah, I've messed up the tag. So let's try again:

#syz test git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 519d81956ee277b4419c723adfb154603c2565ba

								Honza

-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR

View attachment "0001-isofs-Fix-out-of-bound-access-for-corrupted-isofs-im.patch" of type "text/x-patch" (941 bytes)