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[PATCH] Fix MADV_REMOVE protection checking

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madvise_remove needs to respect file and mmap protections.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
[ Will the real CVE-2006-1524 stand up, please.. ]
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hugh Dickins 2006-04-17 22:46:32 +01:00 committed by Linus Torvalds
parent e14d95f773
commit 69cf0fac60
1 changed files with 3 additions and 0 deletions
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3
mm/madvise.c
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@ -168,6 +168,9 @@ static long madvise_remove(struct vm_area_struct *vma,
return -EINVAL;
}
if ((vma->vm_flags & (VM_SHARED|VM_WRITE)) != (VM_SHARED|VM_WRITE))
return -EACCES;
mapping = vma->vm_file->f_mapping;
offset = (loff_t)(start - vma->vm_start)