linux-kernel - Re: [PATCH v2] fscache: fix OOB Read in __fscache_acquire

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Message-ID: <3725574.1668698074@warthog.procyon.org.uk>
Date:   Thu, 17 Nov 2022 15:14:34 +0000
From:   David Howells <dhowells@...hat.com>
To:     Peng Zhang <zhangpeng362@...wei.com>
Cc:     dhowells@...hat.com, ericvh@...il.com, lucho@...kov.net,
        asmadeus@...ewreck.org, linux_oss@...debyte.com,
        jlayton@...nel.org, v9fs-developer@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org,
        syzbot+a76f6a6e524cf2080aa3@...kaller.appspotmail.com
Subject: Re: [PATCH v2] fscache: fix OOB Read in __fscache_acquire_volume

I think that the size needs to be able to hold up to 255 to handle NFS keys,
so I think the right solution has to be to fix the maths.  Probably the
easiest way is to change fscache_volume::key to be "u8 *" since it
isn't a simple text string.

David