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edd3cb05c0
With the introduction of clone3 in commit 7f192e3cd3 ("fork: add
clone3") the effective bit width of clone_flags on all architectures was
increased from 32-bit to 64-bit, with a new type of u64 for the flags.
However, for most consumers of clone_flags the interface was not
changed from the previous type of unsigned long.
While this works fine as long as none of the new 64-bit flag bits
(CLONE_CLEAR_SIGHAND and CLONE_INTO_CGROUP) are evaluated, this is still
undesirable in terms of the principle of least surprise.
Thus, this commit fixes all relevant interfaces of callees to
sys_clone3/copy_process (excluding the architecture-specific
copy_thread) to consistently pass clone_flags as u64, so that
no truncation to 32-bit integers occurs on 32-bit architectures.
Signed-off-by: Simon Schuster <schuster.simon@siemens-energy.com>
Link: https://lore.kernel.org/20250901-nios2-implement-clone3-v2-2-53fcf5577d57@siemens-energy.com
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Christian Brauner <brauner@kernel.org>
85 lines
1.7 KiB
C
85 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (c) 2022, Microsoft Corporation.
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*
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* Authors:
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* Beau Belgrave <beaub@linux.microsoft.com>
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*/
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#ifndef _LINUX_USER_EVENTS_H
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#define _LINUX_USER_EVENTS_H
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#include <linux/list.h>
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#include <linux/refcount.h>
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#include <linux/mm_types.h>
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#include <linux/workqueue.h>
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#include <uapi/linux/user_events.h>
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#ifdef CONFIG_USER_EVENTS
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struct user_event_mm {
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struct list_head mms_link;
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struct list_head enablers;
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struct mm_struct *mm;
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/* Used for one-shot lists, protected by event_mutex */
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struct user_event_mm *next;
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refcount_t refcnt;
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refcount_t tasks;
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struct rcu_work put_rwork;
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};
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extern void user_event_mm_dup(struct task_struct *t,
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struct user_event_mm *old_mm);
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extern void user_event_mm_remove(struct task_struct *t);
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static inline void user_events_fork(struct task_struct *t,
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u64 clone_flags)
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{
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struct user_event_mm *old_mm;
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if (!t || !current->user_event_mm)
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return;
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old_mm = current->user_event_mm;
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if (clone_flags & CLONE_VM) {
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t->user_event_mm = old_mm;
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refcount_inc(&old_mm->tasks);
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return;
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}
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user_event_mm_dup(t, old_mm);
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}
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static inline void user_events_execve(struct task_struct *t)
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{
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if (!t || !t->user_event_mm)
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return;
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user_event_mm_remove(t);
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}
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static inline void user_events_exit(struct task_struct *t)
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{
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if (!t || !t->user_event_mm)
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return;
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user_event_mm_remove(t);
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}
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#else
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static inline void user_events_fork(struct task_struct *t,
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u64 clone_flags)
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{
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}
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static inline void user_events_execve(struct task_struct *t)
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{
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}
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static inline void user_events_exit(struct task_struct *t)
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{
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}
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#endif /* CONFIG_USER_EVENTS */
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#endif /* _LINUX_USER_EVENTS_H */
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