linux-kernel - [ 10/42] fs/binfmt_elf.c: fix hugetlb memory check in vma_dump

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Message-Id: <20130423215206.604858158@linuxfoundation.org>
Date:	Tue, 23 Apr 2013 14:52:08 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Rik van Riel <riel@...hat.com>,
	Michal Hocko <mhocko@...e.cz>,
	HATAYAMA Daisuke <d.hatayama@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [ 10/42] fs/binfmt_elf.c: fix hugetlb memory check in vma_dump_size()

3.8-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Naoya Horiguchi <n-horiguchi@...jp.nec.com>

commit 23d9e482136e31c9d287633a6e473daa172767c4 upstream.

Documentation/filesystems/proc.txt says about coredump_filter bitmask,

  Note bit 0-4 doesn't effect any hugetlb memory. hugetlb memory are only
  effected by bit 5-6.

However current code can go into the subsequent flag checks of bit 0-4
for vma(VM_HUGETLB). So this patch inserts 'return' and makes it work
as written in the document.

Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Reviewed-by: Rik van Riel <riel@...hat.com>
Acked-by: Michal Hocko <mhocko@...e.cz>
Reviewed-by: HATAYAMA Daisuke <d.hatayama@...fujitsu.com>
Acked-by: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Acked-by: David Rientjes <rientjes@...gle.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>

---
 fs/binfmt_elf.c |    1 +
 1 file changed, 1 insertion(+)

--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -1132,6 +1132,7 @@ static unsigned long vma_dump_size(struc
 			goto whole;
 		if (!(vma->vm_flags & VM_SHARED) && FILTER(HUGETLB_PRIVATE))
 			goto whole;
+		return 0;
 	}
 
 	/* Do not dump I/O mapped devices or special mappings */


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