linux-kernel - [PATCH v2 1/6] signal: Pretty up the SIGNAL_GROUP

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Message-ID: <87lfkdla92.fsf_-_@x220.int.ebiederm.org>
Date:   Tue, 23 Jun 2020 16:53:29 -0500
From:   ebiederm@...ssion.com (Eric W. Biederman)
To:     <linux-kernel@...r.kernel.org>
Cc:     <linux-fsdevel@...r.kernel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Oleg Nesterov <oleg@...hat.com>, Jann Horn <jannh@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Bernd Edlinger <bernd.edlinger@...mail.de>
Subject: [PATCH v2 1/6] signal: Pretty up the SIGNAL_GROUP_FLAGS


Renumber the flags that go in sig->flags giving different groups of
flags different hex digits.

This is needed so that future additions of flags can be adjacent.

Signed-off-by: "Eric W. Biederman" <ebiederm@...ssion.com>
---
 include/linux/sched/signal.h | 16 +++++++++-------
 1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/include/linux/sched/signal.h b/include/linux/sched/signal.h
index 0ee5e696c5d8..b4f36a11be5e 100644
--- a/include/linux/sched/signal.h
+++ b/include/linux/sched/signal.h
@@ -241,20 +241,22 @@ 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.
- */
+
+/* Pending notifications to parent. */
 #define SIGNAL_CLD_STOPPED	0x00000010
 #define SIGNAL_CLD_CONTINUED	0x00000020
 #define SIGNAL_CLD_MASK		(SIGNAL_CLD_STOPPED|SIGNAL_CLD_CONTINUED)
 
-#define SIGNAL_UNKILLABLE	0x00000040 /* for init: ignore fatal signals */
-
 #define SIGNAL_STOP_MASK (SIGNAL_CLD_MASK | SIGNAL_STOP_STOPPED | \
 			  SIGNAL_STOP_CONTINUED)
 
+/* Signal group actions. */
+#define SIGNAL_GROUP_EXIT	0x00000100 /* group exit in progress */
+#define SIGNAL_GROUP_COREDUMP	0x00000200 /* coredump in progress */
+
+/* Flags applicable to the entire signal group. */
+#define SIGNAL_UNKILLABLE	0x00001000 /* for init: ignore fatal signals */
+
 static inline void signal_set_stop_flags(struct signal_struct *sig,
 					 unsigned int flags)
 {
-- 
2.20.1