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From: Arseny Maslennikov <ar@cs.msu.ru>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jiri Slaby <jslaby@suse.com>, Ingo Molnar <mingo@redhat.com>,
	Peter Zijlstra <peterz@infradead.org>,
	linux-serial@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: "Vladimir D. Seleznev" <vseleznv@altlinux.org>,
	Rob Landley <rob@landley.net>,
	"Eric W. Biederman" <ebiederm@xmission.com>,
	Pavel Machek <pavel@ucw.cz>, Arseny Maslennikov <ar@cs.msu.ru>
Subject: [PATCH v2 4/7] linux/signal.h: Ignore SIGINFO by default in new tasks
Date: Tue, 25 Jun 2019 19:11:50 +0300	[thread overview]
Message-ID: <20190625161153.29811-5-ar@cs.msu.ru> (raw)
In-Reply-To: <20190625161153.29811-1-ar@cs.msu.ru>

This matches the behaviour of other Unix-like systems that have SIGINFO
and causes less harm to processes that do not install handlers for this
signal, making the keyboard status character non-fatal for them.

This is implemented with the assumption that SIGINFO is defined
to be equivalent to SIGPWR; still, there is no reason for PWR to
result in termination of the signal recipient anyway — it does not
indicate there is a fatal problem with the recipient's execution
context (like e.g. FPE/ILL do), and we have TERM/KILL for explicit
termination requests.

Signed-off-by: Arseny Maslennikov <ar@cs.msu.ru>
---
 include/linux/signal.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/include/linux/signal.h b/include/linux/signal.h
index 9702016734b1..c365754ea647 100644
--- a/include/linux/signal.h
+++ b/include/linux/signal.h
@@ -360,7 +360,7 @@ extern bool unhandled_signal(struct task_struct *tsk, int sig);
  *	|  SIGSYS/SIGUNUSED  |	coredump 	|
  *	|  SIGSTKFLT         |	terminate	|
  *	|  SIGWINCH          |	ignore   	|
- *	|  SIGPWR            |	terminate	|
+ *	|  SIGPWR            |	ignore   	|
  *	|  SIGRTMIN-SIGRTMAX |	terminate       |
  *	+--------------------+------------------+
  *	|  non-POSIX signal  |  default action  |
@@ -411,7 +411,8 @@ extern bool unhandled_signal(struct task_struct *tsk, int sig);
 
 #define SIG_KERNEL_IGNORE_MASK (\
         rt_sigmask(SIGCONT)   |  rt_sigmask(SIGCHLD)   | \
-	rt_sigmask(SIGWINCH)  |  rt_sigmask(SIGURG)    )
+	rt_sigmask(SIGWINCH)  |  rt_sigmask(SIGURG)    | \
+	rt_sigmask(SIGINFO)			       )
 
 #define SIG_SPECIFIC_SICODES_MASK (\
 	rt_sigmask(SIGILL)    |  rt_sigmask(SIGFPE)    | \
-- 
2.20.1


  parent reply	other threads:[~2019-06-25 16:13 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-25 16:11 [PATCH v2 0/7] TTY Keyboard Status Request Arseny Maslennikov
2019-06-25 16:11 ` [PATCH v2 1/7] signal.h: Define SIGINFO on all architectures Arseny Maslennikov
2019-06-25 16:11 ` [PATCH v2 2/7] tty: termios: Reserve space for VSTATUS in .c_cc Arseny Maslennikov
2019-06-25 16:11 ` [PATCH v2 3/7] n_tty: Send SIGINFO to fg pgrp on status request character Arseny Maslennikov
2019-06-25 16:11 ` Arseny Maslennikov [this message]
2019-06-25 21:32   ` [PATCH v2 4/7] linux/signal.h: Ignore SIGINFO by default in new tasks Theodore Ts'o
2019-06-26 13:49     ` Arseny Maslennikov
2019-07-29 10:55     ` Arseny Maslennikov
2019-06-25 16:11 ` [PATCH v2 5/7] tty: Add NOKERNINFO lflag to termios Arseny Maslennikov
2019-06-25 16:11 ` [PATCH v2 6/7] n_tty: ->ops->write: Cut core logic out to a separate function Arseny Maslennikov
2019-06-25 16:11 ` [PATCH v2 7/7] n_tty: Provide an informational line on VSTATUS receipt Arseny Maslennikov
2019-07-30 16:19   ` Greg Kroah-Hartman
2019-07-31 22:23     ` Arseny Maslennikov
2019-08-01  9:20       ` Greg Kroah-Hartman
2019-08-01 10:10         ` Pavel Machek
2019-08-01 12:44         ` Rob Landley
2019-08-02 11:04         ` Arseny Maslennikov
2019-08-01 12:35     ` Rob Landley
2019-07-29 10:56 ` [PATCH v2 0/7] TTY Keyboard Status Request Arseny Maslennikov

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