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[POWERPC] spufs: avoid accessing kernel memory through mmapped /mem node

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I found an exploit in current kernel.
Currently, there is no range check about mmapping "/mem" node in
spufs. Thus, an application can access privilege memory region.

In case this kernel already worked on a public server, I send this
information only here.
If there are such servers in somewhere, please replace it, ASAP.

Signed-off-by: Masato Noguchi <Masato.Noguchi@jp.sony.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
This commit is contained in:
Masato Noguchi 2007-02-13 21:54:30 +01:00 committed by Arnd Bergmann
parent 2eb1b12049
commit 128b8546a8
1 changed files with 3 additions and 0 deletions
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3
arch/powerpc/platforms/cell/spufs/file.c
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@ -103,6 +103,9 @@ static unsigned long spufs_mem_mmap_nopfn(struct vm_area_struct *vma,
offset += vma->vm_pgoff << PAGE_SHIFT;
if (offset >= LS_SIZE)
return NOPFN_SIGBUS;
spu_acquire(ctx);
if (ctx->state == SPU_STATE_SAVED) {