Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=d1f5a77f2c9db5b8a565eabdf8b534b02e32cc44
Commit: d1f5a77f2c9db5b8a565eabdf8b534b02e32cc44
Parent: 8f2ea1fd3f97ab7a809e939b5b9005a16f862439
Author: Benjamin Herrenschmidt <[EMAIL PROTECTED]>
AuthorDate: Wed Aug 8 15:44:15 2007 +1000
Committer: Paul Mackerras <[EMAIL PROTECTED]>
CommitDate: Fri Aug 10 21:04:42 2007 +1000
[POWERPC] Fix size check for hugetlbfs
My "slices" address space management code that was added in the 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]>
---
arch/powerpc/mm/slice.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/arch/powerpc/mm/slice.c b/arch/powerpc/mm/slice.c
index f833dba..d5fd390 100644
--- a/arch/powerpc/mm/slice.c
+++ b/arch/powerpc/mm/slice.c
@@ -405,6 +405,8 @@ unsigned long slice_get_unmapped_area(unsigned long addr,
unsigned long len,
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))
-
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