linux-kernel - Re: [syzbot] KASAN: vmalloc-out-of-bounds Write in ringbuf_map

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Message-ID: <0000000000004cc7f905d709f0f6@google.com>
Date:   Wed, 02 Feb 2022 06:36:09 -0800
From:   syzbot <syzbot+5ad567a418794b9b5983@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, andreyknvl@...gle.com,
        andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
        daniel@...earbox.net, davem@...emloft.net, elver@...gle.com,
        glider@...gle.com, hotforest@...il.com, houtao1@...wei.com,
        john.fastabend@...il.com, kafai@...com, kpsingh@...nel.org,
        kuba@...nel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, sfr@...b.auug.org.au,
        songliubraving@...com, syzkaller-bugs@...glegroups.com, yhs@...com
Subject: Re: [syzbot] KASAN: vmalloc-out-of-bounds Write in ringbuf_map_alloc

syzbot has bisected this issue to:

commit c34cdf846c1298de1c0f7fbe04820fe96c45068c
Author: Andrey Konovalov <andreyknvl@...gle.com>
Date:   Wed Feb 2 01:04:27 2022 +0000

    kasan, vmalloc: unpoison VM_ALLOC pages after mapping

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=128cb900700000
start commit:   6abab1b81b65 Add linux-next specific files for 20220202
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=118cb900700000
console output: https://syzkaller.appspot.com/x/log.txt?x=168cb900700000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b8d8750556896349
dashboard link: https://syzkaller.appspot.com/bug?extid=5ad567a418794b9b5983
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1450d9f0700000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=130ef35bb00000

Reported-by: syzbot+5ad567a418794b9b5983@...kaller.appspotmail.com
Fixes: c34cdf846c12 ("kasan, vmalloc: unpoison VM_ALLOC pages after mapping")

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