4.18-stable review patch. If anyone has any objections, please let me know.
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From: Ram Pai linuxram@us.ibm.com
commit c76662e825f507b98938dc3bb141c4505bd4968c upstream.
When a thread forks the contents of AMR, IAMR, UAMOR registers in the newly forked thread are not inherited.
Save the registers before forking, for content of those registers to be automatically copied into the new thread.
Fixes: cf43d3b26452 ("powerpc: Enable pkey subsystem") Cc: stable@vger.kernel.org # v4.16+ Signed-off-by: Ram Pai linuxram@us.ibm.com Signed-off-by: Michael Ellerman mpe@ellerman.id.au Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/powerpc/kernel/process.c | 1 + 1 file changed, 1 insertion(+)
--- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -583,6 +583,7 @@ static void save_all(struct task_struct __giveup_spe(tsk);
msr_check_and_clear(msr_all_available); + thread_pkey_regs_save(&tsk->thread); }
void flush_all_to_thread(struct task_struct *tsk)