tree fadc568154bbe3c1466081b718e9638438c82c46
parent 68589bc353037f233fe510ad9ff432338c95db66
author David Gibson <david@gibson.dropbear.id.au> 1163498618 -0800
committer Linus Torvalds <torvalds@woody.osdl.org> 1163524167 -0800

[PATCH] hugetlb: check for brk() entering a hugepage region

Unlike mmap(), the codepath for brk() creates a vma without first checking
that it doesn't touch a region exclusively reserved for hugepages.  On
powerpc, this can allow it to create a normal page vma in a hugepage
region, causing oopses and other badness.

Add a test to prevent this.  With this patch, brk() will simply fail if it
attempts to move the break into a hugepage reserved region.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Cc: Adam Litke <agl@us.ibm.com>
Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>