Author: markj
Date: Mon Aug 17 21:30:49 2020
New Revision: 364329
URL: https://svnweb.freebsd.org/changeset/base/364329
Log:
Remove "emulation" of clone(CLONE_PARENT | CLONE_THREAD).
On Linux this is supposed to result in EINVAL.
Reported by: syzkaller
MFC after: 1 week
Sponsored by: The FreeBSD Foundation
Modified:
head/sys/compat/linux/linux_fork.c
Modified: head/sys/compat/linux/linux_fork.c
==============================================================================
--- head/sys/compat/linux/linux_fork.c Mon Aug 17 21:30:15 2020
(r364328)
+++ head/sys/compat/linux/linux_fork.c Mon Aug 17 21:30:49 2020
(r364329)
@@ -244,6 +244,8 @@ linux_clone_thread(struct thread *td, struct linux_clo
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);
@@ -304,12 +306,8 @@ linux_clone_thread(struct thread *td, struct linux_clo
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. */
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