[PATCH V4 4/8] fork: Add KERNEL_WORKER flag to ignore signals
From: Mike Christie <michael.christie@oracle.com>
Date: 2021-10-07 21:46:01
Also in:
lkml
Subsystem:
exec & binfmt api, elf, memory management - core, scheduler, the rest · Maintainers:
Kees Cook, Andrew Morton, David Hildenbrand, Ingo Molnar, Peter Zijlstra, Juri Lelli, Vincent Guittot, Linus Torvalds
From: Christian Brauner <redacted>
Since this is mirroring kthread's sig ignore api introduced in
commit 10ab825bdef8 ("change kernel threads to ignore signals instead of
blocking them")
this patch adds an option flag, KERNEL_WORKER_SIG_IGN, handled in
copy_process() after copy_sighand() and copy_signals() to ease the
transition from kthreads to this new api.
Signed-off-by: Christian Brauner <redacted>
Signed-off-by: Mike Christie <michael.christie@oracle.com>
---
include/linux/sched/task.h | 1 +
kernel/fork.c | 3 +++
2 files changed, 4 insertions(+)
diff --git a/include/linux/sched/task.h b/include/linux/sched/task.h
index 1153f9e5d10e..5f3928fe0544 100644
--- a/include/linux/sched/task.h
+++ b/include/linux/sched/task.h@@ -21,6 +21,7 @@ struct css_set; #define KERN_WORKER_IO BIT(0) #define KERN_WORKER_USER BIT(1) #define KERN_WORKER_NO_FILES BIT(2) +#define KERN_WORKER_SIG_IGN BIT(3) struct kernel_clone_args { u64 flags;
diff --git a/kernel/fork.c b/kernel/fork.c
index 3161edac1236..07f9e410fb64 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c@@ -2213,6 +2213,9 @@ static __latent_entropy struct task_struct *copy_process( if (retval) goto bad_fork_cleanup_io; + if (args->worker_flags & KERN_WORKER_SIG_IGN) + ignore_signals(p); + stackleak_task_init(p); if (pid != &init_struct_pid) {
--
2.25.1
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