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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/arch/um/os-Linux/skas/process.c
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@@ -1,10 +1,11 @@
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+// SPDX-License-Identifier: GPL-2.0
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 /*
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  * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de)
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  * Copyright (C) 2002- 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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- * Licensed under the GPL
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  */
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 #include <stdlib.h>
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+#include <stdbool.h>
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 #include <unistd.h>
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 #include <sched.h>
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 #include <errno.h>
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@@ -249,6 +250,7 @@
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 }
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 int userspace_pid[NR_CPUS];
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+int kill_userspace_mm[NR_CPUS];
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 /**
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  * start_userspace() - prepare a new userspace process
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@@ -342,6 +344,8 @@
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 	interrupt_end();
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 	while (1) {
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+		if (kill_userspace_mm[0])
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+			fatal_sigsegv();
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 		/*
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 		 * This can legitimately fail if the process loads a
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@@ -425,9 +429,9 @@
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 			case SIGBUS:
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 			case SIGFPE:
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 			case SIGWINCH:
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-				block_signals();
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+				block_signals_trace();
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 				(*sig_info[sig])(sig, (struct siginfo *)&si, regs);
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-				unblock_signals();
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+				unblock_signals_trace();
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 				break;
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 			default:
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 				printk(UM_KERN_ERR "userspace - child stopped "
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@@ -625,10 +629,10 @@
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 	cb_arg = arg;
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 	cb_back = &here;
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-	block_signals();
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+	block_signals_trace();
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 	if (UML_SETJMP(&here) == 0)
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 		UML_LONGJMP(&initial_jmpbuf, INIT_JMP_CALLBACK);
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-	unblock_signals();
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+	unblock_signals_trace();
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 	cb_proc = NULL;
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 	cb_arg = NULL;
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@@ -637,17 +641,32 @@
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 void halt_skas(void)
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 {
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-	block_signals();
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+	block_signals_trace();
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 	UML_LONGJMP(&initial_jmpbuf, INIT_JMP_HALT);
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 }
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+static bool noreboot;
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+
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+static int __init noreboot_cmd_param(char *str, int *add)
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+{
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+	noreboot = true;
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+	return 0;
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+}
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+
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+__uml_setup("noreboot", noreboot_cmd_param,
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+"noreboot\n"
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+"    Rather than rebooting, exit always, akin to QEMU's -no-reboot option.\n"
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+"    This is useful if you're using CONFIG_PANIC_TIMEOUT in order to catch\n"
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+"    crashes in CI\n");
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+
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 void reboot_skas(void)
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 {
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-	block_signals();
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-	UML_LONGJMP(&initial_jmpbuf, INIT_JMP_REBOOT);
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+	block_signals_trace();
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+	UML_LONGJMP(&initial_jmpbuf, noreboot ? INIT_JMP_HALT : INIT_JMP_REBOOT);
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 }
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 void __switch_mm(struct mm_id *mm_idp)
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 {
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 	userspace_pid[0] = mm_idp->u.pid;
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+	kill_userspace_mm[0] = mm_idp->kill;
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 }