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Message-Id: <20120518212650.137110817@linuxfoundation.org> Date: Fri, 18 May 2012 14:26:59 -0700 From: Greg KH <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org Cc: torvalds@...ux-foundation.org, akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk, Al Viro <viro@...iv.linux.org.uk>, Russell King <rmk+kernel@....linux.org.uk> Subject: [ 10/47] ARM: prevent VM_GROWSDOWN mmaps extending below FIRST_USER_ADDRESS 3.3-stable review patch. If anyone has any objections, please let me know. ------------------ From: Russell King <rmk+kernel@....linux.org.uk> commit 9b61a4d1b2064dbd0c9e61754305ac852170509f upstream. Reported-by: Al Viro <viro@...iv.linux.org.uk> Signed-off-by: Russell King <rmk+kernel@....linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- arch/arm/mm/fault.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) --- a/arch/arm/mm/fault.c +++ b/arch/arm/mm/fault.c @@ -245,7 +245,9 @@ good_area: 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; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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