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| author | Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2020-11-27 05:44:13 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-12-03 15:01:25 +0100 |
| commit | f643fcab74c005ddfdda68c69909f03bde766ff1 (patch) | |
| tree | 86f928edd890d7efc6489c3befdec0c66f8a4873 /arch/powerpc/kernel/process.c | |
| parent | powerpc/book3s64/pkeys: Store/restore userspace AMR/IAMR correctly on entry a... (diff) | |
| download | linux-f643fcab74c005ddfdda68c69909f03bde766ff1.tar.xz linux-f643fcab74c005ddfdda68c69909f03bde766ff1.zip | |
powerpc/book3s64/pkeys: Inherit correctly on fork.
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.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Reviewed-by: Sandipan Das <sandipan@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201127044424.40686-12-aneesh.kumar@linux.ibm.com
Diffstat (limited to '')
| -rw-r--r-- | arch/powerpc/kernel/process.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index 3f0b6adecf75..2ec907a6f9af 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -1761,6 +1761,16 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, p->thread.tidr = 0; #endif + /* + * Run with the current AMR value of the kernel + */ +#ifdef CONFIG_PPC_PKEY + if (mmu_has_feature(MMU_FTR_BOOK3S_KUAP)) + kregs->amr = AMR_KUAP_BLOCKED; + + if (mmu_has_feature(MMU_FTR_BOOK3S_KUEP)) + kregs->iamr = AMR_KUEP_BLOCKED; +#endif kregs->nip = ppc_function_entry(f); return 0; } |