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

[Greg KH]

On Tue, Feb 06, 2018 at 11:09:37AM -0800, Jin Qian wrote:
> From: Jin Qian <jinqian@xxxxxxxxxx>
> 
> 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@xxxxxxxxxxxxxxx
> Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Jin Qian <jinqian@xxxxxxxxxx>
> Signed-off-by: Jin Qian <jinqian@xxxxxxxxxxx>

Ted, any objection to this patch?

thanks,

greg k-h