mk-rootfs.sh

hc

2023-12-11 072de836f53be56a70cecf70b43ae43b7ce17376

 kernel/include/linux/tracehook.h
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@@ -1,11 +1,8 @@
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+/* SPDX-License-Identifier: GPL-2.0-only */
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 /*
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  * Tracing hooks
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  *
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  * Copyright (C) 2008-2009 Red Hat, Inc.  All rights reserved.
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- *
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- * This copyrighted material is made available to anyone wishing to use,
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- * modify, copy, or redistribute it subject to the terms and conditions
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- * of the GNU General Public License v.2.
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  *
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  * This file defines hook entry points called by core code where
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  * user tracing/debugging support might need to do something.  These
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@@ -57,13 +54,15 @@
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 /*
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  * ptrace report for syscall entry and exit looks identical.
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  */
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-static inline int ptrace_report_syscall(struct pt_regs *regs)
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+static inline int ptrace_report_syscall(struct pt_regs *regs,
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+					unsigned long message)
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 {
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 	int ptrace = current->ptrace;
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 	if (!(ptrace & PT_PTRACED))
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 		return 0;
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64
 
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+	current->ptrace_message = message;
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 	ptrace_notify(SIGTRAP | ((ptrace & PT_TRACESYSGOOD) ? 0x80 : 0));
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 	/*
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@@ -76,6 +75,7 @@
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 		current->exit_code = 0;
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 	}
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+	current->ptrace_message = 0;
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 	return fatal_signal_pending(current);
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 }
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@@ -83,8 +83,8 @@
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  * tracehook_report_syscall_entry - task is about to attempt a system call
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  * @regs:		user register state of current task
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  *
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- * This will be called if %TIF_SYSCALL_TRACE has been set, when the
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- * current task has just entered the kernel for a system call.
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+ * This will be called if %TIF_SYSCALL_TRACE or %TIF_SYSCALL_EMU have been set,
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+ * when the current task has just entered the kernel for a system call.
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  * Full user register state is available here.  Changing the values
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  * in @regs can affect the system call number and arguments to be tried.
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  * It is safe to block here, preventing the system call from beginning.
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@@ -101,7 +101,7 @@
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 static inline __must_check int tracehook_report_syscall_entry(
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 	struct pt_regs *regs)
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 {
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-	return ptrace_report_syscall(regs);
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+	return ptrace_report_syscall(regs, PTRACE_EVENTMSG_SYSCALL_ENTRY);
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 }
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 /**
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@@ -123,15 +123,10 @@
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  */
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 static inline void tracehook_report_syscall_exit(struct pt_regs *regs, int step)
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 {
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-	if (step) {
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-		siginfo_t info;
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-		clear_siginfo(&info);
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-		user_single_step_siginfo(current, regs, &info);
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-		force_sig_info(SIGTRAP, &info, current);
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-		return;
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-	}
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-
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-	ptrace_report_syscall(regs);
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+	if (step)
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+		user_single_step_report(regs);
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+	else
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+		ptrace_report_syscall(regs, PTRACE_EVENTMSG_SYSCALL_EXIT);
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 }
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 /**
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@@ -183,17 +178,47 @@
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  */
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 static inline void tracehook_notify_resume(struct pt_regs *regs)
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 {
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+	clear_thread_flag(TIF_NOTIFY_RESUME);
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 	/*
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-	 * The caller just cleared TIF_NOTIFY_RESUME. This barrier
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-	 * pairs with task_work_add()->set_notify_resume() after
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+	 * This barrier pairs with task_work_add()->set_notify_resume() after
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 	 * hlist_add_head(task->task_works);
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 	 */
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 	smp_mb__after_atomic();
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 	if (unlikely(current->task_works))
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 		task_work_run();
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+#ifdef CONFIG_KEYS_REQUEST_CACHE
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+	if (unlikely(current->cached_requested_key)) {
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+		key_put(current->cached_requested_key);
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+		current->cached_requested_key = NULL;
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+	}
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+#endif
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+
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 	mem_cgroup_handle_over_high();
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 	blkcg_maybe_throttle_current();
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 }
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+/*
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+ * called by exit_to_user_mode_loop() if ti_work & _TIF_NOTIFY_SIGNAL. This
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+ * is currently used by TWA_SIGNAL based task_work, which requires breaking
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+ * wait loops to ensure that task_work is noticed and run.
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+ */
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+static inline void tracehook_notify_signal(void)
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+{
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+	clear_thread_flag(TIF_NOTIFY_SIGNAL);
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+	smp_mb__after_atomic();
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+	if (current->task_works)
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+		task_work_run();
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+}
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+
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+/*
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+ * Called when we have work to process from exit_to_user_mode_loop()
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+ */
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+static inline void set_notify_signal(struct task_struct *task)
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+{
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+	if (!test_and_set_tsk_thread_flag(task, TIF_NOTIFY_SIGNAL) &&
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+	    !wake_up_state(task, TASK_INTERRUPTIBLE))
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+		kick_process(task);
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+}
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+
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 #endif	/* <linux/tracehook.h> */