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-rw-r--r--arch/arm64/kernel/ptrace.c26
1 files changed, 20 insertions, 6 deletions
diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c
index f17810030fa0..f79b0d5f71ac 100644
--- a/arch/arm64/kernel/ptrace.c
+++ b/arch/arm64/kernel/ptrace.c
@@ -1491,6 +1491,22 @@ static int poe_set(struct task_struct *target, const struct
#endif
#ifdef CONFIG_ARM64_GCS
+static void task_gcs_to_user(struct user_gcs *user_gcs,
+ const struct task_struct *target)
+{
+ user_gcs->features_enabled = target->thread.gcs_el0_mode;
+ user_gcs->features_locked = target->thread.gcs_el0_locked;
+ user_gcs->gcspr_el0 = target->thread.gcspr_el0;
+}
+
+static void task_gcs_from_user(struct task_struct *target,
+ const struct user_gcs *user_gcs)
+{
+ target->thread.gcs_el0_mode = user_gcs->features_enabled;
+ target->thread.gcs_el0_locked = user_gcs->features_locked;
+ target->thread.gcspr_el0 = user_gcs->gcspr_el0;
+}
+
static int gcs_get(struct task_struct *target,
const struct user_regset *regset,
struct membuf to)
@@ -1503,9 +1519,7 @@ static int gcs_get(struct task_struct *target,
if (target == current)
gcs_preserve_current_state();
- user_gcs.features_enabled = target->thread.gcs_el0_mode;
- user_gcs.features_locked = target->thread.gcs_el0_locked;
- user_gcs.gcspr_el0 = target->thread.gcspr_el0;
+ task_gcs_to_user(&user_gcs, target);
return membuf_write(&to, &user_gcs, sizeof(user_gcs));
}
@@ -1521,6 +1535,8 @@ static int gcs_set(struct task_struct *target, const struct
if (!system_supports_gcs())
return -EINVAL;
+ task_gcs_to_user(&user_gcs, target);
+
ret = user_regset_copyin(&pos, &count, &kbuf, &ubuf, &user_gcs, 0, -1);
if (ret)
return ret;
@@ -1528,9 +1544,7 @@ static int gcs_set(struct task_struct *target, const struct
if (user_gcs.features_enabled & ~PR_SHADOW_STACK_SUPPORTED_STATUS_MASK)
return -EINVAL;
- target->thread.gcs_el0_mode = user_gcs.features_enabled;
- target->thread.gcs_el0_locked = user_gcs.features_locked;
- target->thread.gcspr_el0 = user_gcs.gcspr_el0;
+ task_gcs_from_user(target, &user_gcs);
return 0;
}