Christian Brauner (Amutable)
b092062cb6
Introduce struct task_exec_state, a per-task RCU-protected structure that holds the dumpable mode and the user namespace and stays attached to the task for its full lifetime. task_exec_state_rcu() is the canonical reader: asserts RCU or task_lock is held, WARNs on a NULL state, returns the rcu_dereference()'d pointer. Reviewed-by: Jann Horn <jannh@google.com> Link: https://patch.msgid.link/20260520-work-task_exec_state-v3-2-69f895bc1385@kernel.org Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
32 lines
1.1 KiB
C
32 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2026 Christian Brauner <brauner@kernel.org> */
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#ifndef _LINUX_SCHED_EXEC_STATE_H
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#define _LINUX_SCHED_EXEC_STATE_H
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#include <linux/init.h>
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#include <linux/rcupdate.h>
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#include <linux/refcount.h>
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#include <linux/sched/coredump.h>
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#include <linux/user_namespace.h>
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struct task_exec_state {
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refcount_t count;
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enum task_dumpable dumpable;
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struct user_namespace *user_ns;
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struct rcu_head rcu;
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};
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struct task_exec_state *alloc_task_exec_state(struct user_namespace *user_ns);
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void put_task_exec_state(struct task_exec_state *exec_state);
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struct task_exec_state *task_exec_state_rcu(const struct task_struct *tsk);
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struct task_exec_state *task_exec_state_replace(struct task_struct *tsk,
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struct task_exec_state *exec_state);
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void task_exec_state_set_dumpable(enum task_dumpable value);
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enum task_dumpable task_exec_state_get_dumpable(struct task_struct *task);
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int task_exec_state_copy(struct task_struct *tsk);
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void __init exec_state_init(void);
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DEFINE_FREE(put_task_exec_state, struct task_exec_state *, put_task_exec_state(_T))
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#endif /* _LINUX_SCHED_EXEC_STATE_H */
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