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authorEric W. Biederman <ebiederm@xmission.com>2021-06-24 02:14:30 -0500
committerEric W. Biederman <ebiederm@xmission.com>2022-01-08 12:43:57 -0600
commit49697335e0b441b0553598c1b48ee9ebb053d2f1 (patch)
tree87f8bbaeb9f274055e4bf8bb84e8aef77038f39f /include/linux/sched
parent60700e38fb68e800607ca7a027060d5419fc5798 (diff)
signal: Remove the helper signal_group_exit
This helper is misleading. It tests for an ongoing exec as well as the process having received a fatal signal. Sometimes it is appropriate to treat an on-going exec differently than a process that is shutting down due to a fatal signal. In particular taking the fast path out of exit_signals instead of retargeting signals is not appropriate during exec, and not changing the the exit code in do_group_exit during exec. Removing the helper makes it more obvious what is going on as both cases must be coded for explicitly. While removing the helper fix the two cases where I have observed using signal_group_exit resulted in the wrong result. In exit_signals only test for SIGNAL_GROUP_EXIT so that signals are retargetted during an exec. In do_group_exit use 0 as the exit code during an exec as de_thread does not set group_exit_code. As best as I can determine group_exit_code has been is set to 0 most of the time during de_thread. During a thread group stop group_exit_code is set to the stop signal and when the thread group receives SIGCONT group_exit_code is reset to 0. Link: https://lkml.kernel.org/r/20211213225350.27481-8-ebiederm@xmission.com Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'include/linux/sched')
-rw-r--r--include/linux/sched/signal.h7
1 files changed, 0 insertions, 7 deletions
diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h
index d3248aba5183..b6ecb9fc4cd2 100644
--- a/include/linux/sched/signal.h
+++ b/include/linux/sched/signal.h
@@ -271,13 +271,6 @@ static inline void signal_set_stop_flags(struct signal_struct *sig,
sig->flags = (sig->flags & ~SIGNAL_STOP_MASK) | flags;
}
-/* If true, all threads except ->group_exec_task have pending SIGKILL */
-static inline int signal_group_exit(const struct signal_struct *sig)
-{
- return (sig->flags & SIGNAL_GROUP_EXIT) ||
- (sig->group_exec_task != NULL);
-}
-
extern void flush_signals(struct task_struct *);
extern void ignore_signals(struct task_struct *);
extern void flush_signal_handlers(struct task_struct *, int force_default);