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From: Chao Yu <yuchao0@huawei.com>
To: Eric Biggers <ebiggers@kernel.org>,
	<linux-f2fs-devel@lists.sourceforge.net>
Cc: <linux-ext4@vger.kernel.org>,
	Daniel Rosenberg <drosen@google.com>, <stable@vger.kernel.org>,
	Al Viro <viro@zeniv.linux.org.uk>,
	<linux-fsdevel@vger.kernel.org>,
	Gabriel Krisman Bertazi <krisman@collabora.co.uk>
Subject: Re: [PATCH v2] f2fs: avoid utf8_strncasecmp() with unstable name
Date: Mon, 8 Jun 2020 09:37:52 +0800	[thread overview]
Message-ID: <a2849e34-879d-783a-761e-5ce9a1d43311@huawei.com> (raw)
In-Reply-To: <20200601200805.59655-1-ebiggers@kernel.org>

On 2020/6/2 4:08, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@google.com>
> 
> If the dentry name passed to ->d_compare() fits in dentry::d_iname, then
> it may be concurrently modified by a rename.  This can cause undefined
> behavior (possibly out-of-bounds memory accesses or crashes) in
> utf8_strncasecmp(), since fs/unicode/ isn't written to handle strings
> that may be concurrently modified.
> 
> Fix this by first copying the filename to a stack buffer if needed.
> This way we get a stable snapshot of the filename.
> 
> Fixes: 2c2eb7a300cd ("f2fs: Support case-insensitive file name lookups")
> Cc: <stable@vger.kernel.org> # v5.4+
> Cc: Al Viro <viro@zeniv.linux.org.uk>
> Cc: Daniel Rosenberg <drosen@google.com>
> Cc: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
> Signed-off-by: Eric Biggers <ebiggers@google.com>

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

Thanks,

      reply	other threads:[~2020-06-08  1:38 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-01 20:08 [PATCH v2] f2fs: avoid utf8_strncasecmp() with unstable name Eric Biggers
2020-06-08  1:37 ` Chao Yu [this message]

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