On Fri, Sep 19, 2014 at 9:09 AM, Wang, Yalin <Yalin.Wang@xxxxxxxxxxxxxx> wrote:
> this patch extend the start and end address of initrd to be page aligned,
> so that we can free all memory including the un-page aligned head or tail
> page of initrd, if the start or end address of initrd are not page
> aligned, the page can't be freed by free_initrd_mem() function.
>
> Signed-off-by: Yalin Wang <yalin.wang@xxxxxxxxxxxxxx>
> ---
> arch/arm/mm/init.c | 5 +++++
> arch/arm64/mm/init.c | 8 +++++++-
> 2 files changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
> index 659c75d..9221645 100644
> --- a/arch/arm/mm/init.c
> +++ b/arch/arm/mm/init.c
> @@ -636,6 +636,11 @@ static int keep_initrd;
> void free_initrd_mem(unsigned long start, unsigned long end)
> {
> if (!keep_initrd) {
> + if (start == initrd_start)
> + start = round_down(start, PAGE_SIZE);
> + if (end == initrd_end)
> + end = round_up(end, PAGE_SIZE);
> +
> poison_init_mem((void *)start, PAGE_ALIGN(end) - start);
> free_reserved_area((void *)start, (void *)end, -1, "initrd");
> }
Who guarantees there's no valuable data in [start, initrd_start)
and [initrd_end, end) being corrupted?
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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