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Ram Pai authored
Key allocation and deallocation has the side effect of programming the UAMOR/AMR/IAMR registers. This is wrong, since its the responsibility of the application and not that of the kernel, to modify the permission on the key. Do not modify the pkey registers at key allocation/deallocation. This patch also fixes a bug where a sys_pkey_free() resets the UAMOR bits of the key, thus making its permissions unmodifiable from user space. Later if the same key gets reallocated from a different thread this thread will no longer be able to change the permissions on the key. Fixes: cf43d3b2 ("powerpc: Enable pkey subsystem") Cc: stable@vger.kernel.org # v4.16+ Reviewed-by:
Thiago Jung Bauermann <bauerman@linux.ibm.com> Signed-off-by:
Ram Pai <linuxram@us.ibm.com> Signed-off-by:
Michael Ellerman <mpe@ellerman.id.au>
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