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>
Subject: [PATCH]Fix: 32bit binary has 64bit address of stack vma
Date: Mon, 5 Jan 2009 15:39:07 -0800 [thread overview]
Message-ID: <604427e00901051539x52ab85bcua94cd8036e5b619a@mail.gmail.com> (raw)
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 reply other threads:[~2009-01-05 23:39 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-01-05 23:39 Ying Han [this message]
2009-01-09 2:40 ` [PATCH]Fix: 32bit binary has 64bit address of stack vma Ying Han
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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