linux-kernel - Re: [Cluster-devel] [PATCH] gfs2: move from strlcpy with unused retval to strscpy

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Message-ID: <YwaFRvWw5hi/uWYs@shikoro>
Date:   Wed, 24 Aug 2022 22:08:38 +0200
From:   Wolfram Sang <wsa+renesas@...g-engineering.com>
To:     Andrew Price <anprice@...hat.com>
Cc:     cluster-devel@...hat.com, linux-kernel@...r.kernel.org,
        Andreas Gruenbacher <agruenba@...hat.com>,
        Bob Peterson <rpeterso@...hat.com>
Subject: Re: [Cluster-devel] [PATCH] gfs2: move from strlcpy with unused
 retval to strscpy

Hi Andy.

> > -	strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
> > -	strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
> > +	strscpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
> > +	strscpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
> 
> Perhaps the size should be changed to GFS2_LOCKNAME_LEN to match the size of
> the destination, too.
> 
> With that addition, this patch fixes this syzkaller report:
> 
> https://listman.redhat.com/archives/cluster-devel/2022-August/022755.html

Linus wrote another summary about strlcpy vs. strscpy use[1]. So, the
size argument should be the size of the smaller buffer if the buffers
are of different size. GFS2_LOCKNAME_LEN is smaller, so that looks
suitable. Shall I resend the patch with the suggested change?

All the best,

   Wolfram

[1] https://lore.kernel.org/lkml/CAHk-=wi+xbVq++uqW9YgWpHjyBHNB8a-xad+Xp23-B+eodLCEA@mail.gmail.com/


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