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authorEric W. Biederman <ebiederm@xmission.com>2022-04-11 14:13:56 -0500
committerEric W. Biederman <ebiederm@xmission.com>2022-05-07 09:01:59 -0500
commit753550eb0ce1fea4b5cbd989f2e06ef80b2feb28 (patch)
tree57908b5c1c0a3f4979d06e683b362ccb1907f582 /kernel/fork.c
parent68d85f0a33b0cbfe4921485160ff75ea7a081215 (diff)
fork: Explicitly set PF_KTHREAD
Instead of implicitly inheriting PF_KTHREAD from the parent process examine arguments in kernel_clone_args to see if PF_KTHREAD should be set. This makes knowledge of which new threads are kernel threads explicit. This also makes it so that init and the user mode helper processes no longer have PF_KTHREAD set. Link: https://lkml.kernel.org/r/20220506141512.516114-6-ebiederm@xmission.com Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'kernel/fork.c')
-rw-r--r--kernel/fork.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c
index 8e17c3fbce42..35645f57bd2f 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2068,6 +2068,9 @@ static __latent_entropy struct task_struct *copy_process(
p = dup_task_struct(current, node);
if (!p)
goto fork_out;
+ p->flags &= ~PF_KTHREAD;
+ if (args->kthread)
+ p->flags |= PF_KTHREAD;
if (args->io_thread) {
/*
* Mark us an IO worker, and block any signal that isn't