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Remove "emulation" of clone(CLONE_PARENT | CLONE_THREAD).

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On Linux this is supposed to result in EINVAL.

Reported by:	syzkaller
MFC after:	1 week
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Mark Johnston 2020-08-17 21:30:49 +00:00
parent 74a796e0fc
commit d9565182fd
1 changed files with 3 additions and 5 deletions
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8
sys/compat/linux/linux_fork.c
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@ -244,6 +244,8 @@ linux_clone_thread(struct thread *td, struct linux_clone_args *args)
td->td_tid, (unsigned)args->flags,
args->parent_tidptr, args->child_tidptr);
if ((args->flags & LINUX_CLONE_PARENT) != 0)
return (EINVAL);
if (args->flags & LINUX_CLONE_PARENT_SETTID)
if (args->parent_tidptr == NULL)
return (EINVAL);
@ -304,13 +306,9 @@ linux_clone_thread(struct thread *td, struct linux_clone_args *args)
PROC_LOCK(p);
p->p_flag |= P_HADTHREADS;
thread_link(newtd, p);
bcopy(p->p_comm, newtd->td_name, sizeof(newtd->td_name));
if (args->flags & LINUX_CLONE_PARENT)
thread_link(newtd, p->p_pptr);
else
thread_link(newtd, p);
thread_lock(td);
/* let the scheduler know about these things. */
sched_fork_thread(td, newtd);