linux-kernel - Re: KASAN: vmalloc-out-of-bounds Read in compat_copy

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Message-ID: <0000000000000f9d220599b83d18@google.com>
Date:   Sat, 14 Dec 2019 22:31:01 -0800
From:   syzbot <syzbot+f68108fed972453a0ad4@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, aryabinin@...tuozzo.com,
        bridge@...ts.linux-foundation.org, coreteam@...filter.org,
        davem@...emloft.net, dja@...ens.net, dvyukov@...gle.com,
        fw@...len.de, kadlec@...filter.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, netfilter-devel@...r.kernel.org,
        nikolay@...ulusnetworks.com, pablo@...filter.org,
        roopa@...ulusnetworks.com, syzkaller-bugs@...glegroups.com,
        torvalds@...ux-foundation.org
Subject: Re: KASAN: vmalloc-out-of-bounds Read in compat_copy_entries

syzbot has bisected this bug to:

commit 0609ae011deb41c9629b7f5fd626dfa1ac9d16b0
Author: Daniel Axtens <dja@...ens.net>
Date:   Sun Dec 1 01:55:00 2019 +0000

     x86/kasan: support KASAN_VMALLOC

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=166d43dee00000
start commit:   e31736d9 Merge tag 'nios2-v5.5-rc2' of git://git.kernel.or..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=156d43dee00000
console output: https://syzkaller.appspot.com/x/log.txt?x=116d43dee00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=79f79de2a27d3e3d
dashboard link: https://syzkaller.appspot.com/bug?extid=f68108fed972453a0ad4
userspace arch: i386
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16bc5946e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=17302361e00000

Reported-by: syzbot+f68108fed972453a0ad4@...kaller.appspotmail.com
Fixes: 0609ae011deb ("x86/kasan: support KASAN_VMALLOC")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection