This is a note to let you know that we have just queued up the patch titled
Subject: powerpc: Fix size check for hugetlbfs
to the 2.6.22-stable tree. Its filename is
powerpc-fix-size-check-for-hugetlbfs.patch
A git repo of this tree can be found at
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
>From [EMAIL PROTECTED] Mon Aug 13 16:17:09 2007
From: Benjamin Herrenschmidt <[EMAIL PROTECTED]>
Date: Wed, 08 Aug 2007 15:44:15 +1000
Subject: powerpc: Fix size check for hugetlbfs
To: linuxppc-dev list <linuxppc-dev@ozlabs.org>
Cc: Paul Mackerras <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
Message-ID: <[EMAIL PROTECTED]>
From: Benjamin Herrenschmidt <[EMAIL PROTECTED]>
My "slices" address space management code that was added in 2.6.22
implementation of get_unmapped_area() doesn't properly check that the
size is a multiple of the requested page size. This allows userland to
create VMAs that aren't a multiple of the huge page size with hugetlbfs
(since hugetlbfs entirely relies on get_unmapped_area() to do that
checking) which leads to a kernel BUG() when such areas are torn down.
Signed-off-by: Benjamin Herrenschmidt <[EMAIL PROTECTED]>
Signed-off-by: Paul Mackerras <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
--- linux-work.orig/arch/powerpc/mm/slice.c 2007-08-08 15:16:06.000000000
+1000
+++ linux-work/arch/powerpc/mm/slice.c 2007-08-08 15:16:41.000000000 +1000
@@ -405,6 +405,8 @@ unsigned long slice_get_unmapped_area(un
if (len > mm->task_size)
return -ENOMEM;
+ if (len & ((1ul << pshift) - 1))
+ return -EINVAL;
if (fixed && (addr & ((1ul << pshift) - 1)))
return -EINVAL;
if (fixed && addr > (mm->task_size - len))
_______________________________________________
stable mailing list
[EMAIL PROTECTED]
http://linux.kernel.org/mailman/listinfo/stable
Patches currently in stable-queue which might be from [EMAIL PROTECTED] are
queue-2.6.22/ppc-revert-don-t-complain-if-size-cells-0-in-prom_parse.patch
queue-2.6.22/ppc-revert-add-mdio-to-bus-scan-id-list-for-platforms-with-qe-uec.patch
queue-2.6.22/powerpc-fix-size-check-for-hugetlbfs.patch
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