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Clarify what CLONE_THREAD depends on

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This commit is contained in:
Ruihan Li
2024-12-01 12:26:05 +08:00
committed by Tate, Hongliang Tian
parent 74c11134f1
commit fe7e4884c9
1 changed files with 23 additions and 6 deletions
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29
kernel/src/process/clone.rs
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@ -202,6 +202,26 @@ fn clone_child_task(
parent_context: &UserContext,
clone_args: CloneArgs,
) -> Result<Arc<Task>> {
let clone_flags = clone_args.flags;
// This combination is not valid, according to the Linux man pages. See
// <https://www.man7.org/linux/man-pages/man2/clone.2.html>.
if !clone_flags.contains(CloneFlags::CLONE_VM | CloneFlags::CLONE_SIGHAND) {
return_errno_with_message!(
Errno::EINVAL,
"`CLONE_THREAD` without `CLONE_VM` and `CLONE_SIGHAND` is not valid"
);
}
// This is valid combination in Linux. But we do not support it yet.
if !clone_flags.contains(CloneFlags::CLONE_FILES) || !clone_flags.contains(CloneFlags::CLONE_FS)
{
return_errno_with_message!(
Errno::EINVAL,
"`CLONE_THREAD` without `CLONE_FILES` or `CLONE_FS` is not supported"
);
}
let Context {
process,
posix_thread,
@ -209,12 +229,10 @@ fn clone_child_task(
task: _,
} = ctx;
let clone_flags = clone_args.flags;
debug_assert!(clone_flags.contains(CloneFlags::CLONE_VM));
debug_assert!(clone_flags.contains(CloneFlags::CLONE_FILES));
debug_assert!(clone_flags.contains(CloneFlags::CLONE_SIGHAND));
let child_root_vmar = process.root_vmar();
// clone system V semaphore
clone_sysvsem(clone_flags)?;
let child_root_vmar = process.root_vmar();
let child_user_space = {
let child_vm_space = child_root_vmar.vm_space().clone();
let child_cpu_context = clone_cpu_context(
@ -226,7 +244,6 @@ fn clone_child_task(
);
Arc::new(UserSpace::new(child_vm_space, child_cpu_context))
};
clone_sysvsem(clone_flags)?;
// Inherit sigmask from current thread
let sig_mask = posix_thread.sig_mask().load(Ordering::Relaxed).into();