mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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edd3cb05c0
With the introduction of clone3 in commit 7f192e3cd316 ("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>
132 lines
3.0 KiB
C
132 lines
3.0 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ WITH Linux-syscall-note */
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#ifndef _LINUX_RSEQ_H
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#define _LINUX_RSEQ_H
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#ifdef CONFIG_RSEQ
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#include <linux/preempt.h>
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#include <linux/sched.h>
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/*
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* Map the event mask on the user-space ABI enum rseq_cs_flags
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* for direct mask checks.
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*/
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enum rseq_event_mask_bits {
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RSEQ_EVENT_PREEMPT_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_PREEMPT_BIT,
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RSEQ_EVENT_SIGNAL_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_SIGNAL_BIT,
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RSEQ_EVENT_MIGRATE_BIT = RSEQ_CS_FLAG_NO_RESTART_ON_MIGRATE_BIT,
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};
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enum rseq_event_mask {
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RSEQ_EVENT_PREEMPT = (1U << RSEQ_EVENT_PREEMPT_BIT),
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RSEQ_EVENT_SIGNAL = (1U << RSEQ_EVENT_SIGNAL_BIT),
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RSEQ_EVENT_MIGRATE = (1U << RSEQ_EVENT_MIGRATE_BIT),
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};
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static inline void rseq_set_notify_resume(struct task_struct *t)
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{
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if (t->rseq)
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set_tsk_thread_flag(t, TIF_NOTIFY_RESUME);
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}
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void __rseq_handle_notify_resume(struct ksignal *sig, struct pt_regs *regs);
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static inline void rseq_handle_notify_resume(struct ksignal *ksig,
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struct pt_regs *regs)
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{
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if (current->rseq)
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__rseq_handle_notify_resume(ksig, regs);
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}
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static inline void rseq_signal_deliver(struct ksignal *ksig,
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struct pt_regs *regs)
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{
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preempt_disable();
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__set_bit(RSEQ_EVENT_SIGNAL_BIT, ¤t->rseq_event_mask);
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preempt_enable();
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rseq_handle_notify_resume(ksig, regs);
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}
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/* rseq_preempt() requires preemption to be disabled. */
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static inline void rseq_preempt(struct task_struct *t)
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{
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__set_bit(RSEQ_EVENT_PREEMPT_BIT, &t->rseq_event_mask);
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rseq_set_notify_resume(t);
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}
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/* rseq_migrate() requires preemption to be disabled. */
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static inline void rseq_migrate(struct task_struct *t)
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{
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__set_bit(RSEQ_EVENT_MIGRATE_BIT, &t->rseq_event_mask);
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rseq_set_notify_resume(t);
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}
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/*
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* If parent process has a registered restartable sequences area, the
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* child inherits. Unregister rseq for a clone with CLONE_VM set.
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*/
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static inline void rseq_fork(struct task_struct *t, u64 clone_flags)
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{
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if (clone_flags & CLONE_VM) {
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t->rseq = NULL;
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t->rseq_len = 0;
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t->rseq_sig = 0;
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t->rseq_event_mask = 0;
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} else {
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t->rseq = current->rseq;
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t->rseq_len = current->rseq_len;
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t->rseq_sig = current->rseq_sig;
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t->rseq_event_mask = current->rseq_event_mask;
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}
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}
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static inline void rseq_execve(struct task_struct *t)
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{
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t->rseq = NULL;
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t->rseq_len = 0;
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t->rseq_sig = 0;
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t->rseq_event_mask = 0;
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}
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#else
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static inline void rseq_set_notify_resume(struct task_struct *t)
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{
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}
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static inline void rseq_handle_notify_resume(struct ksignal *ksig,
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struct pt_regs *regs)
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{
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}
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static inline void rseq_signal_deliver(struct ksignal *ksig,
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struct pt_regs *regs)
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{
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}
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static inline void rseq_preempt(struct task_struct *t)
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{
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}
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static inline void rseq_migrate(struct task_struct *t)
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{
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}
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static inline void rseq_fork(struct task_struct *t, u64 clone_flags)
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{
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}
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static inline void rseq_execve(struct task_struct *t)
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{
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}
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#endif
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#ifdef CONFIG_DEBUG_RSEQ
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void rseq_syscall(struct pt_regs *regs);
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#else
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static inline void rseq_syscall(struct pt_regs *regs)
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{
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}
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#endif
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#endif /* _LINUX_RSEQ_H */
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