Child thread.kuap value is inherited from the parent in copy_thread_tls. We still need to make sure when the child returns from a fork in the kernel we start with the kernel default AMR value.
Reviewed-by: Sandipan Das <sandi...@linux.ibm.com> Signed-off-by: Aneesh Kumar K.V <aneesh.ku...@linux.ibm.com> --- arch/powerpc/kernel/process.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index b6b8a845e454..733680de0ba4 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1768,6 +1768,17 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, childregs->ppr = DEFAULT_PPR; p->thread.tidr = 0; +#endif + /* + * Run with the current AMR value of the kernel + */ +#ifdef CONFIG_PPC_KUAP + if (mmu_has_feature(MMU_FTR_KUAP)) + kregs->kuap = AMR_KUAP_BLOCKED; +#endif +#ifdef CONFIG_PPC_KUEP + if (mmu_has_feature(MMU_FTR_KUEP)) + kregs->iamr = AMR_KUEP_BLOCKED; #endif kregs->nip = ppc_function_entry(f); return 0; -- 2.28.0