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Commit 69cf0fac authored by Hugh Dickins's avatar Hugh Dickins Committed by Linus Torvalds
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[PATCH] Fix MADV_REMOVE protection checking 



madvise_remove needs to respect file and mmap protections.

Signed-off-by: default avatarHugh Dickins <hugh@veritas.com>
[ Will the real CVE-2006-1524 stand up, please.. ]
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent e14d95f7

mm/madvise.c

+3 −0
Original line number Original line Diff line number Diff line
@@ -168,6 +168,9 @@ static long madvise_remove(struct vm_area_struct *vma, 
			return -EINVAL;

			return -EINVAL;

	}

	}





	if ((vma->vm_flags & (VM_SHARED|VM_WRITE)) != (VM_SHARED|VM_WRITE))

		return -EACCES;



	mapping = vma->vm_file->f_mapping;

	mapping = vma->vm_file->f_mapping;





	offset = (loff_t)(start - vma->vm_start)

	offset = (loff_t)(start - vma->vm_start)