linux-kernel - Re: [PATCH v2] ext4: fix kernel infoleak via ext4_extent

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Message-ID: <YMqNHnTofj9fR8IJ@mit.edu>
Date:   Wed, 16 Jun 2021 19:45:34 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Anirudh Rayabharam <mail@...rudhrb.com>
Cc:     Andreas Dilger <adilger.kernel@...ger.ca>,
        Dave Kleikamp <shaggy@...tin.ibm.com>,
        Alex Tomas <alex@...sterfs.com>, Andrew Morton <akpm@...l.org>,
        gregkh@...uxfoundation.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        syzbot+2dcfeaf8cb49b05e8f1a@...kaller.appspotmail.com,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ext4: fix kernel infoleak via ext4_extent_header

On Fri, May 07, 2021 at 12:26:54AM +0530, Anirudh Rayabharam wrote:
> Initialize eh_generation of struct ext4_extent_header to prevent leaking
> info to userspace. Fixes KMSAN kernel-infoleak bug reported by syzbot at:
> http://syzkaller.appspot.com/bug?id=78e9ad0e6952a3ca16e8234724b2fa92d041b9b8
> 
> Reported-by: syzbot+2dcfeaf8cb49b05e8f1a@...kaller.appspotmail.com
> Fixes: a86c61812637 ("[PATCH] ext3: add extent map support")
> Signed-off-by: Anirudh Rayabharam <mail@...rudhrb.com>

Applied, thanks.

					- Ted