linux-kernel - Re: [PATCH] erofs: fix uninitialized page cache reported by KMSAN

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Date: Thu, 7 Mar 2024 09:04:50 +0800
From: Chao Yu <chao@...nel.org>
To: Gao Xiang <hsiangkao@...ux.alibaba.com>, linux-erofs@...ts.ozlabs.org
Cc: syzbot+7bc44a489f0ef0670bd5@...kaller.appspotmail.com,
 Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
 syzkaller-bugs@...glegroups.com, LKML <linux-kernel@...r.kernel.org>,
 Roberto Sassu <roberto.sassu@...weicloud.com>, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH] erofs: fix uninitialized page cache reported by KMSAN

On 2024/3/4 11:53, Gao Xiang wrote:
> syzbot reports a KMSAN reproducer [1] which generates a crafted
> filesystem image and causes IMA to read uninitialized page cache.
> 
> Later, (rq->outputsize > rq->inputsize) will be formally supported
> after either large uncompressed pclusters (> block size) or big
> lclusters are landed.  However, currently there is no way to generate
> such filesystems by using mkfs.erofs.
> 
> Thus, let's mark this condition as unsupported for now.
> 
> [1] https://lore.kernel.org/r/0000000000002be12a0611ca7ff8@google.com
> 
> Reported-by: syzbot+7bc44a489f0ef0670bd5@...kaller.appspotmail.com
> Fixes: 1ca01520148a ("erofs: refine z_erofs_transform_plain() for sub-page block support")
> Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com>

Reviewed-by: Chao Yu <chao@...nel.org>

Thanks,