linux-kernel - Re: [syzbot] UBSAN: shift-out-of-bounds in profile

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Message-ID: <20210716173819.07aa5afd@gmail.com>
Date:   Fri, 16 Jul 2021 17:38:19 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     syzbot <syzbot+e68c89a9510c159d9684@...kaller.appspotmail.com>
Cc:     linux-kernel@...r.kernel.org, penguin-kernel@...ove.SAKURA.ne.jp,
        rostedt@...dmis.org, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de
Subject: Re: [syzbot] UBSAN: shift-out-of-bounds in profile_init

On Wed, 14 Jul 2021 05:47:21 -0700
syzbot <syzbot+e68c89a9510c159d9684@...kaller.appspotmail.com> wrote:

> Hello,
> 
> syzbot found the following issue on:
> 
> HEAD commit:    3dbdb38e Merge branch 'for-5.14' of
> git://git.kernel.org/p.. git tree:       upstream
> console output:
> https://syzkaller.appspot.com/x/log.txt?x=11342328300000 kernel
> config:  https://syzkaller.appspot.com/x/.config?x=a1fcf15a09815757
> dashboard link:
> https://syzkaller.appspot.com/bug?extid=e68c89a9510c159d9684 syz
> repro:
> https://syzkaller.appspot.com/x/repro.syz?x=149a96d2300000 C
> reproducer:   https://syzkaller.appspot.com/x/repro.c?x=114e5bc4300000
> 
> IMPORTANT: if you fix the issue, please add the following tag to the
> commit: Reported-by:
> syzbot+e68c89a9510c159d9684@...kaller.appspotmail.com
> 

With clamp() call suggested by Tetsuo

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



With regards,
Pavel Skripkin

View attachment "0001-profiling-fix-shift-out-of-bounds.patch" of type "text/x-patch" (1921 bytes)