[PATCH 5/8] signal: Remove SIGNAL_GROUP_COREDUMP

Eric W. Biederman
2021-12-13T22:54:58Z

After the previous cleanups "signal->core_state" is set whenever
SIGNAL_GROUP_COREDUMP is set and "signal->core_state" is tested
whenver the code wants to know if a coredump is in progress. The
remaining tests of SIGNAL_GROUP_COREDUMP also test to see if
SIGNAL_GROUP_EXIT is set. Similarly the only place that sets
SIGNAL_GROUP_COREDUMP also sets SIGNAL_GROUP_EXIT.

Which makes SIGNAL_GROUP_COREDUMP unecessary and redundant so
stop setting SIGNAL_GROUP_COREDUMP, stop testing SIGNAL_GROUP_COREDUMP
and remove it's definition makeing the code slightly simpler.

With the setting of SIGNAL_GROUP_COREDUMP gone coredump_finish no
longer needs to clear SIGNAL_GROUP_COREDUMP out of signal->flags
by setting SIGNAL_GROUP_EXIT.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
---
fs/coredump.c | 3 +--
include/linux/sched/signal.h | 3 +--
kernel/signal.c | 2 +-
3 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/fs/coredump.c b/fs/coredump.c
index 5e5a90de7be3..2c9d16d4b57a 100644
--- a/fs/coredump.c
+++ b/fs/coredump.c
@@ -353,7 +353,7 @@ static int zap_process(struct task_struct *start, int exit_code)
int nr = 0;

/* Allow SIGKILL, see prepare_signal() */
- start->signal->flags = SIGNAL_GROUP_EXIT | SIGNAL_GROUP_COREDUMP;
+ start->signal->flags = SIGNAL_GROUP_EXIT;
start->signal->group_exit_code = exit_code;
start->signal->group_stop_count = 0;

@@ -427,7 +427,6 @@ static void coredump_finish(bool core_dumped)
if (core_dumped && !__fatal_signal_pending(current))
current->signal->group_exit_code |= 0x80;
current->signal->group_exit_task = NULL;
- current->signal->flags = SIGNAL_GROUP_EXIT;
next = current->signal->core_state->dumper.next;
current->signal->core_state = NULL;
spin_unlock_irq(&current->sighand->siglock);
diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h
index fa26d2a58413..ecc10e148799 100644
--- a/include/linux/sched/signal.h
+++ b/include/linux/sched/signal.h
@@ -256,7 +256,6 @@ struct signal_struct {
#define SIGNAL_STOP_STOPPED 0x00000001 /* job control stop in effect */
#define SIGNAL_STOP_CONTINUED 0x00000002 /* SIGCONT since WCONTINUED reap */
#define SIGNAL_GROUP_EXIT 0x00000004 /* group exit in progress */
-#define SIGNAL_GROUP_COREDUMP 0x00000008 /* coredump in progress */
/*
* Pending notifications to parent.
*/
@@ -272,7 +271,7 @@ struct signal_struct {
static inline void signal_set_stop_flags(struct signal_struct *sig,
unsigned int flags)
{
- WARN_ON(sig->flags & (SIGNAL_GROUP_EXIT|SIGNAL_GROUP_COREDUMP));
+ WARN_ON(sig->flags & SIGNAL_GROUP_EXIT);
sig->flags = (sig->flags & ~SIGNAL_STOP_MASK) | flags;
}

diff --git a/kernel/signal.c b/kernel/signal.c
index cdccbacac685..9eb3e2c1f9f7 100644
--- a/kernel/signal.c
+++ b/kernel/signal.c
@@ -906,7 +906,7 @@ static bool prepare_signal(int sig, struct task_struct *p, bool force)
struct task_struct *t;
sigset_t flush;

- if (signal->flags & (SIGNAL_GROUP_EXIT | SIGNAL_GROUP_COREDUMP)) {
+ if (signal->flags & SIGNAL_GROUP_EXIT) {
struct core_state *core_state = signal->core_state;
if (core_state) {
if (sig == SIGKILL) {
--
2.29.2