From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Eric W. Biederman" Date: Fri, 29 Apr 2022 21:46:59 +0000 Subject: [PATCH 0/12] ptrace: cleaning up ptrace_stop Message-Id: <87k0b7v9yk.fsf_-_@email.froward.int.ebiederm.org> List-Id: References: <20220421150248.667412396@infradead.org> <20220421150654.817117821@infradead.org> <87czhap9dy.fsf@email.froward.int.ebiederm.org> <878rrrh32q.fsf_-_@email.froward.int.ebiederm.org> In-Reply-To: <878rrrh32q.fsf_-_@email.froward.int.ebiederm.org> (Eric W. Biederman's message of "Tue, 26 Apr 2022 17:50:21 -0500") MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: linux-kernel@vger.kernel.org Cc: rjw@rjwysocki.net, oleg@redhat.com, mingo@kernel.org, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, mgorman@suse.de, bigeasy@linutronix.de, Will Deacon , tj@kernel.org, linux-pm@vger.kernel.org, Peter Zijlstra , Richard Weinberger , Anton Ivanov , Johannes Berg , linux-um@lists.infradead.org, Chris Zankel , Max Filippov , linux-xtensa@linux-xtensa.org, Jann Horn , Kees Cook , linux-ia64@vger.kernel.org The states TASK_STOPPED and TASK_TRACE are special in they can not handle spurious wake-ups. This plus actively depending upon and changing the value of tsk->__state causes problems for PREEMPT_RT and Peter's freezer rewrite. There are a lot of details we have to get right to sort out the technical challenges and this is my parred back version of the changes that contains just those problems I see good solutions to that I believe are ready. In particular I don't have a solution that is ready for the challenges presented by wait_task_inactive. I hope we can review these changes and then have a firm foundation for the rest of the challenges. There are cleanups to the ptrace support for xtensa, um, and ia64. I have sucked in the first patch of Peter's freezer change as with minor modifications I believe it is ready to go. Eric W. Biederman (12): signal: Rename send_signal send_signal_locked signal: Replace __group_send_sig_info with send_signal_locked ptrace/um: Replace PT_DTRACE with TIF_SINGLESTEP ptrace/xtensa: Replace PT_SINGLESTEP with TIF_SINGLESTEP signal: Use lockdep_assert_held instead of assert_spin_locked ptrace: Reimplement PTRACE_KILL by always sending SIGKILL ptrace: Don't change __state ptrace: Remove arch_ptrace_attach ptrace: Always take siglock in ptrace_resume ptrace: Only return signr from ptrace_stop if it was provided ptrace: Always call schedule in ptrace_stop sched,signal,ptrace: Rework TASK_TRACED, TASK_STOPPED state arch/ia64/include/asm/ptrace.h | 4 -- arch/ia64/kernel/ptrace.c | 57 ---------------- arch/um/include/asm/thread_info.h | 2 + arch/um/kernel/exec.c | 2 +- arch/um/kernel/process.c | 2 +- arch/um/kernel/ptrace.c | 8 +-- arch/um/kernel/signal.c | 4 +- arch/xtensa/kernel/ptrace.c | 4 +- arch/xtensa/kernel/signal.c | 4 +- drivers/tty/tty_jobctrl.c | 4 +- include/linux/ptrace.h | 7 -- include/linux/sched.h | 10 ++- include/linux/sched/jobctl.h | 10 +++ include/linux/sched/signal.h | 23 ++++++- include/linux/signal.h | 3 +- kernel/ptrace.c | 88 +++++++++---------------- kernel/signal.c | 135 +++++++++++++++++--------------------- kernel/time/posix-cpu-timers.c | 6 +- 18 files changed, 145 insertions(+), 228 deletions(-) Eric