On (08/13/18 15:16), Minchan Kim wrote:
> > The call to strlcpy in backing_dev_store is incorrect. It should take
> > the size of the destination buffer instead of the size of the source
> > buffer. Additionally, ignore the newline character (\n) when reading
> > the new file_name buffer. This makes it possible to set the backing_dev
> > as follows:
> >
> > echo /dev/sdX > /sys/block/zram0/backing_dev
> >
> > Signed-off-by: Peter Kalauskas <pes...@google.com>
> Acked-by: Minchan Kim <minc...@kernel.org>
>
> Cc: Andrew Morton <a...@linux-foundation.org>
> Cc: Sergey Senozhatsky <sergey.senozhatsky.w...@gmail.com>
> CC: LKML <linux-kernel@vger.kernel.org>
> Cc: <sta...@vger.kernel.org> [4.14+]
Thanks for Cc-ing Minchan.
Reviewed-by: Sergey Senozhatsky <sergey.senozhat...@gmail.com>
> > - strlcpy(file_name, buf, len);
This is quite interesting. The reason it worked before was the fact that
strlcpy() copies 'len - 1' bytes, which is strlen(buf) - 1 in our case,
so it accidentally didn't copy the trailing new line symbol. Which also
means that "echo -n /dev/sdX" most likely was broken.
-ss
