linux-kernel - Re: [PATCH 3/3] erofs: handle corrupted images whose decompressed size less than it'd be

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Date:   Tue, 3 Mar 2020 17:51:19 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Gao Xiang <gaoxiang25@...wei.com>, <linux-erofs@...ts.ozlabs.org>
CC:     LKML <linux-kernel@...r.kernel.org>, Miao Xie <miaoxie@...wei.com>,
        "Lasse Collin" <lasse.collin@...aani.org>
Subject: Re: [PATCH 3/3] erofs: handle corrupted images whose decompressed
 size less than it'd be

On 2020/2/26 10:30, Gao Xiang wrote:
> As Lasse pointed out, "Looking at fs/erofs/decompress.c,
> the return value from LZ4_decompress_safe_partial is only
> checked for negative value to catch errors. ... So if
> I understood it correctly, if there is bad data whose
> uncompressed size is much less than it should be, it can
> leave part of the output buffer untouched and expose the
> previous data as the file content. "
> 
> Let's fix it now.
> 
> Cc: Lasse Collin <lasse.collin@...aani.org>
> Signed-off-by: Gao Xiang <gaoxiang25@...wei.com>

Reviewed-by: Chao Yu <yuchao0@...wei.com>

Thanks,