From: Chen, Kenneth W <kenneth.w.chen@intel.com>
Date: Wed, 4 Oct 2006 09:15:24 +0000 (-0700)
Subject: [PATCH] enforce proper tlb flush in unmap_hugepage_range
X-Git-Tag: v2.6.19-rc1~158
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fe1668ae5bf0145014c71797febd9ad5670d5d05;p=pandora-kernel.git

[PATCH] enforce proper tlb flush in unmap_hugepage_range

Spotted by Hugh that hugetlb page is free'ed back to global pool before
performing any TLB flush in unmap_hugepage_range().  This potentially allow
threads to abuse free-alloc race condition.

The generic tlb gather code is unsuitable to use by hugetlb, I just open
coded a page gathering list and delayed put_page until tlb flush is
performed.

Cc: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Ken Chen <kenneth.w.chen@intel.com>
Acked-by: William Irwin <wli@holomorphy.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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