linux-kernel - Re: [PATCHv2 1/1] ext4: don't put symlink in pagecache into highmem

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Message-ID: <20180206203953.GC18045@kroah.com>
Date:   Tue, 6 Feb 2018 12:39:53 -0800
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Theodore Ts'o <tytso@....edu>
Cc:     Jin Qian <jinqian@...roid.com>,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Jeff Layton <jlayton@...chiereds.net>,
        "J. Bruce Fields" <bfields@...ldses.org>,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, Jin Qian <jinqian@...gle.com>,
        stable@...r.kernel.org
Subject: Re: [PATCHv2 1/1] ext4: don't put symlink in pagecache into highmem

On Tue, Feb 06, 2018 at 11:09:37AM -0800, Jin Qian wrote:
> From: Jin Qian <jinqian@...gle.com>
> 
> partial backport from 21fc61c73c3903c4c312d0802da01ec2b323d174 upstream
> to v4.4 to prevent virt_to_page on highmem.
> 
> ext4_encrypted_follow_link uses kmap() for cpage
>   caddr = kmap(cpage);
> 
> _ext4_fname_disk_to_usr calls virt_to_page on the kmapped address.
>   _ext4_fname_disk_to_usr()
>     ext4_fname_decrypt()
>       sg_init_one()
>         sg_init_one(&src_sg, iname->name, iname->len);
>           sg_set_page(sg, virt_to_page(buf), buflen, offset_in_page(buf));
> 
> Cc: stable@...r.kernel.org
> Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
> Signed-off-by: Jin Qian <jinqian@...gle.com>
> Signed-off-by: Jin Qian <jinqian@...roid.com>

Ted, any objection to this patch?

thanks,

greg k-h