linux-kernel - {2.6.22.y} CVE-2007-6434

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Date:	Mon, 4 Feb 2008 21:13:16 +0100
From:	"Oliver Pinter" <oliver.pntr@...il.com>
To:	stable@...nel.org
Cc:	linux-kernel@...r.kernel.org,
	"chrisw@...s-sol.org" <chrisw@...s-sol.org>,
	"Greg KH" <gregkh@...e.de>, "Willy Tarreau" <w@....eu>,
	"Adrian Bunk" <bunk@...nel.org>, "Nick Piggin" <npiggin@...e.de>
Subject: {2.6.22.y} CVE-2007-6434

mainline: ecaf18c15aac8bb9bed7b7aa0e382fe252e275d5

--->8---
commit ecaf18c15aac8bb9bed7b7aa0e382fe252e275d5
Author: Eric Paris <eparis@...hat.com>
Date:   Tue Dec 4 23:45:31 2007 -0800

    VM/Security: add security hook to do_brk

    Given a specifically crafted binary do_brk() can be used to get low pages
    available in userspace virtual memory and can thus be used to circumvent
    the mmap_min_addr low memory protection.  Add security checks in do_brk().

    Signed-off-by: Eric Paris <eparis@...hat.com>
    Acked-by: Alan Cox <alan@...hat.com>
    Cc: Stephen Smalley <sds@...ho.nsa.gov>
    Cc: James Morris <jmorris@...ei.org>
    Cc: Chris Wright <chrisw@...s-sol.org>
    Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>

diff --git a/mm/mmap.c b/mm/mmap.c
index facc1a7..acfc13f 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1934,6 +1934,10 @@ unsigned long do_brk(unsigned long addr, unsigned long le
        if (is_hugepage_only_range(mm, addr, len))
                return -EINVAL;

+       error = security_file_mmap(0, 0, 0, 0, addr, 1);
+       if (error)
+               return error;
+
        flags = VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags;

        error = arch_mmap_check(addr, len, flags);
---8<---
-- 
Thanks,
Oliver
--
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