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ARM: prevent VM_GROWSDOWN mmaps extending below FIRST_USER_ADDRESS

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Cc: <stable@vger.kernel.org>
Reported-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2012-05-16 15:19:20 +01:00
parent 998de4acb2
commit 9b61a4d1b2
1 changed files with 3 additions and 1 deletions
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4
arch/arm/mm/fault.c
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@ -247,7 +247,9 @@ __do_page_fault(struct mm_struct *mm, unsigned long addr, unsigned int fsr,
return handle_mm_fault(mm, vma, addr & PAGE_MASK, flags);
check_stack:
if (vma->vm_flags & VM_GROWSDOWN && !expand_stack(vma, addr))
/* Don't allow expansion below FIRST_USER_ADDRESS */
if (vma->vm_flags & VM_GROWSDOWN &&
addr >= FIRST_USER_ADDRESS && !expand_stack(vma, addr))
goto good_area;
out:
return fault;