linux-ext4 - Re: [PATCH 2/3] fscrypt: fix renaming and linking special files

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Date:   Fri, 16 Dec 2016 13:22:55 +0100
From:   Richard Weinberger <richard@....at>
To:     Eric Biggers <ebiggers3@...il.com>, linux-fsdevel@...r.kernel.org
Cc:     "Theodore Y . Ts'o" <tytso@....edu>,
        Jaegeuk Kim <jaegeuk@...nel.org>, linux-ext4@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        David Gstir <david@...ma-star.at>,
        Eric Biggers <ebiggers@...gle.com>
Subject: Re: [PATCH 2/3] fscrypt: fix renaming and linking special files

On 15.12.2016 20:19, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@...gle.com>
> 
> Attempting to link a device node, named pipe, or socket file into an
> encrypted directory through rename(2) or link(2) always failed with
> EPERM.  This happened because fscrypt_permitted_context() saw that the
> file was unencrypted and forbid creating the link.  This behavior was
> unexpected because such files are never encrypted; only regular files,
> directories, and symlinks can be encrypted.
> 
> To fix this, make fscrypt_has_permitted_context() always return true on
> special files.
> 
> This will be covered by a test in my encryption xfstests patchset.
> 
> Fixes: 9bd8212f981e ("ext4 crypto: add encryption policy and password salt support")
> Signed-off-by: Eric Biggers <ebiggers@...gle.com>

Reviewed-by: Richard Weinberger <richard@....at>

Thanks,
//richard

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