1 files changed, 119 insertions, 0 deletions
diff --git a/kernel/exec_state.c b/kernel/exec_state.c
new file mode 100644
index 000000000000..6034f4b4808f
--- /dev/null
+++ b/kernel/exec_state.c
@@ -0,0 +1,119 @@
+// SPDX-License-Identifier: GPL-2.0
+/* Copyright (c) 2026 Christian Brauner <brauner@kernel.org> */
+#include <linux/init.h>
+#include <linux/rcupdate.h>
+#include <linux/refcount.h>
+#include <linux/sched.h>
+#include <linux/sched/coredump.h>
+#include <linux/sched/exec_state.h>
+#include <linux/sched/signal.h>
+#include <linux/slab.h>
+#include <linux/user_namespace.h>
+
+static struct kmem_cache *task_exec_state_cachep;
+
+static void __free_task_exec_state(struct rcu_head *rcu)
+{
+	struct task_exec_state *exec_state = container_of(rcu, struct task_exec_state, rcu);
+
+	put_user_ns(exec_state->user_ns);
+	kmem_cache_free(task_exec_state_cachep, exec_state);
+}
+
+void put_task_exec_state(struct task_exec_state *exec_state)
+{
+	if (exec_state && refcount_dec_and_test(&exec_state->count))
+		call_rcu(&exec_state->rcu, __free_task_exec_state);
+}
+
+struct task_exec_state *alloc_task_exec_state(struct user_namespace *user_ns)
+{
+	struct task_exec_state *exec_state;
+
+	exec_state = kmem_cache_alloc(task_exec_state_cachep, GFP_KERNEL);
+	if (!exec_state)
+		return NULL;
+	refcount_set(&exec_state->count, 1);
+	exec_state->dumpable = TASK_DUMPABLE_OFF;
+	exec_state->user_ns = get_user_ns(user_ns);
+	return exec_state;
+}
+
+struct task_exec_state *task_exec_state_rcu(const struct task_struct *tsk)
+{
+	struct task_exec_state *exec_state;
+
+	exec_state = rcu_dereference_check(tsk->exec_state,
+					   lockdep_is_held(&tsk->alloc_lock));
+	WARN_ON_ONCE(!exec_state);
+	return exec_state;
+}
+
+struct task_exec_state *task_exec_state_replace(struct task_struct *tsk,
+						struct task_exec_state *exec_state)
+{
+	/*
+	 * Updates must hold both locks so callers needing a consistent
+	 * snapshot of mm + dumpability are covered.
+	 */
+	lockdep_assert_held(&tsk->alloc_lock);
+	lockdep_assert_held_write(&tsk->signal->exec_update_lock);
+
+	return rcu_replace_pointer(tsk->exec_state, exec_state, true);
+}
+
+/*
+ * The non-CLONE_VM clone path: allocate a fresh exec_state and
+ * inherit the parent's dumpable mode and user_ns reference.  CLONE_VM
+ * siblings refcount-share via copy_exec_state() in fork.c; only this
+ * path and execve() ever allocate.
+ */
+int task_exec_state_copy(struct task_struct *tsk)
+{
+	struct task_exec_state *src, *dst;
+
+	src = rcu_dereference_protected(current->exec_state, true);
+	dst = alloc_task_exec_state(src->user_ns);
+	if (!dst)
+		return -ENOMEM;
+	dst->dumpable = READ_ONCE(src->dumpable);
+	rcu_assign_pointer(tsk->exec_state, dst);
+	return 0;
+}
+
+/*
+ * Store TASK_DUMPABLE_* on current->exec_state.  All callers
+ * (commit_creds, begin_new_exec, prctl(PR_SET_DUMPABLE)) act on the
+ * running task, which guarantees ->exec_state is allocated and cannot
+ * be replaced under us.
+ */
+void task_exec_state_set_dumpable(enum task_dumpable value)
+{
+	struct task_exec_state *exec_state;
+
+	if (WARN_ON_ONCE(value > TASK_DUMPABLE_ROOT))
+		value = TASK_DUMPABLE_OFF;
+
+	exec_state = rcu_dereference_protected(current->exec_state, true);
+	/* mm-less tasks share init_task's exec_state; never mutate it */
+	if (WARN_ON_ONCE(exec_state == &init_task_exec_state))
+		return;
+	WRITE_ONCE(exec_state->dumpable, value);
+}
+
+enum task_dumpable task_exec_state_get_dumpable(struct task_struct *task)
+{
+	struct task_exec_state *exec_state;
+
+	guard(rcu)();
+	exec_state = rcu_dereference(task->exec_state);
+	return READ_ONCE(exec_state->dumpable);
+}
+
+void __init exec_state_init(void)
+{
+	task_exec_state_cachep = kmem_cache_create("task_exec_state",
+			sizeof(struct task_exec_state), 0,
+			SLAB_HWCACHE_ALIGN | SLAB_PANIC | SLAB_ACCOUNT,
+			NULL);
+}