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]>
---
This should go to 2.6.22.x stable in addition to current 2.6.23-*
Index: linux-work/arch/powerpc/mm/slice.c
===================================================================
--- 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))
_______________________________________________
Linuxppc-dev mailing list
Linuxppc-dev@ozlabs.org
https://ozlabs.org/mailman/listinfo/linuxppc-dev
