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Re: [Qemu-devel] [PATCH 06/10] linux-user: init_guest_commpage: Add a co
From: |
Peter Maydell |
Subject: |
Re: [Qemu-devel] [PATCH 06/10] linux-user: init_guest_commpage: Add a comment about size check |
Date: |
Fri, 2 Mar 2018 13:20:01 +0000 |
On 28 December 2017 at 18:08, Luke Shumaker <address@hidden> wrote:
> From: Luke Shumaker <address@hidden>
>
> Signed-off-by: Luke Shumaker <address@hidden>
> ---
> linux-user/elfload.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> diff --git a/linux-user/elfload.c b/linux-user/elfload.c
> index 22f2632dfa..b560f5d6fe 100644
> --- a/linux-user/elfload.c
> +++ b/linux-user/elfload.c
> @@ -374,6 +374,11 @@ static int init_guest_commpage(unsigned long guest_base,
>
> /* If the commpage lies within the already allocated guest space,
> * then there is no way we can allocate it.
> + *
> + * You may be thinking that that this check is redundant because
> + * we already validated the guest size against MAX_RESERVED_VA;
> + * but if qemu_host_page_mask is unusually large, then
> + * test_page_addr may be lower.
> */
> if (test_page_addr >= guest_base
> && test_page_addr < (guest_base + guest_size)) {
> --
Reviewed-by: Peter Maydell <address@hidden>
thanks
-- PMM
- Re: [Qemu-devel] [PATCH 06/10] linux-user: init_guest_commpage: Add a comment about size check,
Peter Maydell <=