From: Ying Han <yinghan@google.com>
To: linux-mm <linux-mm@kvack.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Mike Waychison <mikew@google.com>,
Rohit Seth <rohitseth@google.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-api@vger.kernel.org
Subject: Re: [PATCH]Fix: 32bit binary has 64bit address of stack vma
Date: Thu, 8 Jan 2009 18:40:04 -0800 [thread overview]
Message-ID: <604427e00901081840pa6dcc41u9a7a5c69302c7b60@mail.gmail.com> (raw)
In-Reply-To: <604427e00901051539x52ab85bcua94cd8036e5b619a@mail.gmail.com>
On Mon, Jan 5, 2009 at 3:39 PM, Ying Han <yinghan@google.com> wrote:
> From: Ying Han <yinghan@google.com>
>
> Fix 32bit binary get 64bit stack vma offset.
>
> 32bit binary running on 64bit system, the /proc/pid/maps shows for the
> vma represents stack get a 64bit adress:
> ff96c000-ff981000 rwxp 7ffffffea000 00:00 0 [stack]
>
> Signed-off-by: Ying Han <yinghan@google.com>
>
> fs/exec.c | 5 +-
>
> diff --git a/fs/exec.c b/fs/exec.c
> index 4e834f1..8c3eff4 100644
> --- a/fs/exec.c
> +++ b/fs/exec.c
> @@ -517,6 +517,7 @@ static int shift_arg_pages(struct vm_area_struct *vma, uns
> unsigned long length = old_end - old_start;
> unsigned long new_start = old_start - shift;
> unsigned long new_end = old_end - shift;
> + unsigned long new_pgoff = new_start >> PAGE_SHIFT;
> struct mmu_gather *tlb;
>
> BUG_ON(new_start > new_end);
> @@ -531,7 +532,7 @@ static int shift_arg_pages(struct vm_area_struct *vma, uns
> /*
> * cover the whole range: [new_start, old_end)
> */
> - vma_adjust(vma, new_start, old_end, vma->vm_pgoff, NULL);
> + vma_adjust(vma, new_start, old_end, new_pgoff, NULL);
>
> /*
> * move the page tables downwards, on failure we rely on
> @@ -564,7 +565,7 @@ static int shift_arg_pages(struct vm_area_struct *vma, uns
> /*
> * shrink the vma to just the new range.
> */
> - vma_adjust(vma, new_start, new_end, vma->vm_pgoff, NULL);
> + vma_adjust(vma, new_start, new_end, new_pgoff, NULL);
>
> return 0;
> }
>
--
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next prev parent reply other threads:[~2009-01-09 2:40 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-05 23:39 [PATCH]Fix: 32bit binary has 64bit address of stack vma Ying Han
2009-01-09 2:40 ` Ying Han [this message]
2009-01-10 0:27 ` Ying Han
2009-01-10 0:37 ` Andrew Morton
2009-01-10 1:32 ` Ying Han
2009-01-12 22:59 ` Andrew Morton
2009-01-12 23:05 ` Mike Waychison
2009-01-12 23:10 ` Andrew Morton
2009-01-13 17:59 ` Hugh Dickins
2009-01-12 23:06 ` Ying Han
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