tree 583e2b763c69ef3209a9eb7a20aeb5950c82fb5b
parent 0836fbea480f5d688d14054fd5faf75869a74e6e
author Madhavan Srinivasan <maddy@linux.vnet.ibm.com> 1380654250 +0530
committer chrmhoffmann <chrmhoffmann@gmail.com> 1586074829 +0200

powerpc/sysfs: Disable writing to PURR in guest mode

commit d1211af3049f4c9c1d8d4eb8f8098cc4f4f0d0c7 upstream.

arch/powerpc/kernel/sysfs.c exports PURR with write permission.
This may be valid for kernel in phyp mode. But writing to
the file in guest mode causes crash due to a priviledge violation

Signed-off-by: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
[Backported to 3.4: adjust context]
Signed-off-by: Yijing Wang <wangyijing@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>