add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/arm/kernel/signal.c
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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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  *  linux/arch/arm/kernel/signal.c
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  *
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  *  Copyright (C) 1995-2009 Russell King
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  */
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 #include <linux/errno.h>
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 #include <linux/random.h>
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@@ -241,7 +238,7 @@
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 	frame = (struct sigframe __user *)regs->ARM_sp;
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-	if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
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+	if (!access_ok(frame, sizeof (*frame)))
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 		goto badframe;
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 	if (restore_sigframe(regs, frame))
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@@ -250,7 +247,7 @@
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 	return regs->ARM_r0;
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 badframe:
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-	force_sig(SIGSEGV, current);
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+	force_sig(SIGSEGV);
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 	return 0;
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 }
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@@ -271,7 +268,7 @@
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 	frame = (struct rt_sigframe __user *)regs->ARM_sp;
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-	if (!access_ok(VERIFY_READ, frame, sizeof (*frame)))
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+	if (!access_ok(frame, sizeof (*frame)))
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 		goto badframe;
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 	if (restore_sigframe(regs, &frame->sig))
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@@ -283,7 +280,7 @@
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 	return regs->ARM_r0;
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 badframe:
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-	force_sig(SIGSEGV, current);
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+	force_sig(SIGSEGV);
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 	return 0;
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 }
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@@ -355,7 +352,7 @@
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 	/*
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 	 * Check that we can actually write to the signal frame.
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 	 */
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-	if (!access_ok(VERIFY_WRITE, frame, framesize))
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+	if (!access_ok(frame, framesize))
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 		frame = NULL;
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 	return frame;
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@@ -549,8 +546,7 @@
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 	int ret;
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 	/*
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-	 * Increment event counter and perform fixup for the pre-signal
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-	 * frame.
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+	 * Perform fixup for the pre-signal frame.
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 	 */
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 	rseq_signal_deliver(ksig, regs);
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@@ -600,6 +596,7 @@
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 		switch (retval) {
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 		case -ERESTART_RESTARTBLOCK:
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 			restart -= 2;
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+			fallthrough;
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 		case -ERESTARTNOHAND:
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 		case -ERESTARTSYS:
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 		case -ERESTARTNOINTR:
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@@ -658,7 +655,7 @@
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 			if (unlikely(!user_mode(regs)))
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 				return 0;
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 			local_irq_enable();
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-			if (thread_flags & _TIF_SIGPENDING) {
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+			if (thread_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL)) {
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 				int restart = do_signal(regs, syscall);
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 				if (unlikely(restart)) {
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 					/*
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@@ -672,7 +669,6 @@
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 			} else if (thread_flags & _TIF_UPROBE) {
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 				uprobe_notify_resume(regs);
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 			} else {
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-				clear_thread_flag(TIF_NOTIFY_RESUME);
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 				tracehook_notify_resume(regs);
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 				rseq_handle_notify_resume(NULL, regs);
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 			}
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@@ -718,7 +714,9 @@
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 /* Defer to generic check */
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 asmlinkage void addr_limit_check_failed(void)
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 {
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+#ifdef CONFIG_MMU
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 	addr_limit_user_check();
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+#endif
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 }
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 #ifdef CONFIG_DEBUG_RSEQ