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

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 коммит произвёл Arnd Bergmann
Родитель 2eb1b12049
Коммит 128b8546a8
1 изменённых файлов: 3 добавлений и 0 удалений

Просмотреть файл

@ -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) {