diff mbox series

[RFC,15/25] powerpc/book3s64/pkeys: Inherit correctly on fork.

Message ID 20200427080507.1626327-16-aneesh.kumar@linux.ibm.com (mailing list archive)
State Superseded
Headers show
Series Kernel userspace access/execution prevention with hash translation | expand

Checks

Context Check Description
snowpatch_ozlabs/apply_patch warning Failed to apply on branch powerpc/merge (54dc28ff5e0b3585224d49a31b53e030342ca5c3)
snowpatch_ozlabs/apply_patch warning Failed to apply on branch powerpc/next (45591da765885f7320a111d290b3a28a23eed359)
snowpatch_ozlabs/apply_patch warning Failed to apply on branch linus/master (6a8b55ed4056ea5559ebe4f6a4b247f627870d4c)
snowpatch_ozlabs/apply_patch warning Failed to apply on branch powerpc/fixes (5990cdee689c6885b27c6d969a3d58b09002b0bc)
snowpatch_ozlabs/apply_patch warning Failed to apply on branch linux-next (8bdabd09ec86a993419c8c98a4f34c12bc902c6c)
snowpatch_ozlabs/apply_patch fail Failed to apply to any branch

Commit Message

Aneesh Kumar K V April 27, 2020, 8:04 a.m. UTC 
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>
---
 arch/powerpc/kernel/process.c | 5 +++++
 1 file changed, 5 insertions(+)
diff mbox series

Patch

diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index 78eedf0b5c30..fc4cc32d4726 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1698,6 +1698,11 @@  int copy_thread_tls(unsigned long clone_flags, unsigned long usp,
 
 	p->thread.tidr = 0;
 #endif
+	/*
+	 * Run with the current AMR value of the kernel
+	 */
+	kregs->kuap = AMR_KUAP_BLOCKED;
+	kregs->kuep = AMR_KUEP_BLOCKED;
 	kregs->nip = ppc_function_entry(f);
 	return 0;
 }