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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/misc/kgdbts.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * kgdbts is a test suite for kgdb for the sole purpose of validating
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  * that key pieces of the kgdb internals are working properly such as
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@@ -6,19 +7,6 @@
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  * Created by: Jason Wessel <jason.wessel@windriver.com>
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  *
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  * Copyright (c) 2008 Wind River Systems, Inc.
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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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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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- * See the GNU General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public License
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- * along with this program; if not, write to the Free Software
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- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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  */
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 /* Information about the kgdb test suite.
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  * -------------------------------------
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@@ -45,16 +33,16 @@
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  * You can also specify optional tests:
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  * N## = Go to sleep with interrupts of for ## seconds
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  *       to test the HW NMI watchdog
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- * F## = Break at do_fork for ## iterations
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+ * F## = Break at kernel_clone for ## iterations
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  * S## = Break at sys_open for ## iterations
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  * I## = Run the single step test ## iterations
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  *
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- * NOTE: that the do_fork and sys_open tests are mutually exclusive.
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+ * NOTE: that the kernel_clone and sys_open tests are mutually exclusive.
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  *
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  * To invoke the kgdb test suite from boot you use a kernel start
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  * argument as follows:
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  * 	kgdbts=V1 kgdbwait
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- * Or if you wanted to perform the NMI test for 6 seconds and do_fork
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+ * Or if you wanted to perform the NMI test for 6 seconds and kernel_clone
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  * test for 100 forks, you could use:
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  * 	kgdbts=V1N6F100 kgdbwait
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  *
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@@ -86,7 +74,7 @@
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  * echo kgdbts=V1S10000 > /sys/module/kgdbts/parameters/kgdbts
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  * fg # and hit control-c
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  * fg # and hit control-c
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- * ## This tests break points on do_fork
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+ * ## This tests break points on kernel_clone
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  * while [ 1 ] ; do date > /dev/null ; done &
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  * while [ 1 ] ; do date > /dev/null ; done &
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  * echo kgdbts=V1F1000 > /sys/module/kgdbts/parameters/kgdbts
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@@ -222,8 +210,8 @@
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 		addr = (unsigned long)kgdbts_break_test;
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 	else if (!strcmp(arg, "sys_open"))
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 		addr = (unsigned long)do_sys_open;
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-	else if (!strcmp(arg, "do_fork"))
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-		addr = (unsigned long)_do_fork;
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+	else if (!strcmp(arg, "kernel_clone"))
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+		addr = (unsigned long)kernel_clone;
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 	else if (!strcmp(arg, "hw_break_val"))
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 		addr = (unsigned long)&hw_break_val;
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 	addr = (unsigned long) dereference_function_descriptor((void *)addr);
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@@ -323,7 +311,7 @@
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 	if (arch_needs_sstep_emulation && sstep_addr &&
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 	    ip + offset == sstep_addr &&
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-	    ((!strcmp(arg, "sys_open") || !strcmp(arg, "do_fork")))) {
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+	    ((!strcmp(arg, "sys_open") || !strcmp(arg, "kernel_clone")))) {
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 		/* This is special case for emulated single step */
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 		v2printk("Emul: rewind hit single step bp\n");
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 		restart_from_top_after_write = 1;
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@@ -609,19 +597,19 @@
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 };
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 /*
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- * Test for hitting a breakpoint at do_fork for what ever the number
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+ * Test for hitting a breakpoint at kernel_clone for what ever the number
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  * of iterations required by the variable repeat_test.
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  */
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-static struct test_struct do_fork_test[] = {
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+static struct test_struct do_kernel_clone_test[] = {
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 	{ "?", "S0*" }, /* Clear break points */
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-	{ "do_fork", "OK", sw_break, }, /* set sw breakpoint */
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+	{ "kernel_clone", "OK", sw_break, }, /* set sw breakpoint */
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 	{ "c", "T0*", NULL, get_thread_id_continue }, /* Continue */
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-	{ "do_fork", "OK", sw_rem_break }, /*remove breakpoint */
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-	{ "g", "do_fork", NULL, check_and_rewind_pc }, /* check location */
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+	{ "kernel_clone", "OK", sw_rem_break }, /*remove breakpoint */
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+	{ "g", "kernel_clone", NULL, check_and_rewind_pc }, /* check location */
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 	{ "write", "OK", write_regs, emul_reset }, /* Write registers */
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 	{ "s", "T0*", emul_sstep_get, emul_sstep_put }, /* Single step */
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-	{ "g", "do_fork", NULL, check_single_step },
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-	{ "do_fork", "OK", sw_break, }, /* set sw breakpoint */
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+	{ "g", "kernel_clone", NULL, check_single_step },
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+	{ "kernel_clone", "OK", sw_break, }, /* set sw breakpoint */
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 	{ "7", "T0*", skip_back_repeat_test }, /* Loop based on repeat_test */
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 	{ "D", "OK", NULL, final_ack_set }, /* detach and unregister I/O */
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 	{ "", "", get_cont_catch, put_cont_catch },
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@@ -841,7 +829,7 @@
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 	char before[BREAK_INSTR_SIZE];
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 	char after[BREAK_INSTR_SIZE];
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-	probe_kernel_read(before, (char *)kgdbts_break_test,
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+	copy_from_kernel_nofault(before, (char *)kgdbts_break_test,
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 	  BREAK_INSTR_SIZE);
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 	init_simple_test();
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 	ts.tst = plant_and_detach_test;
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@@ -849,8 +837,8 @@
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 	/* Activate test with initial breakpoint */
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 	if (!is_early)
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 		kgdb_breakpoint();
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-	probe_kernel_read(after, (char *)kgdbts_break_test,
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-	  BREAK_INSTR_SIZE);
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+	copy_from_kernel_nofault(after, (char *)kgdbts_break_test,
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+			BREAK_INSTR_SIZE);
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 	if (memcmp(before, after, BREAK_INSTR_SIZE)) {
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 		printk(KERN_CRIT "kgdbts: ERROR kgdb corrupted memory\n");
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 		panic("kgdb memory corruption");
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@@ -948,11 +936,11 @@
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 	kgdb_breakpoint();
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 }
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-static void run_do_fork_test(void)
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+static void run_kernel_clone_test(void)
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 {
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 	init_simple_test();
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-	ts.tst = do_fork_test;
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-	ts.name = "do_fork_test";
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+	ts.tst = do_kernel_clone_test;
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+	ts.name = "do_kernel_clone_test";
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 	/* Activate test with initial breakpoint */
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 	kgdb_breakpoint();
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 }
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@@ -980,7 +968,7 @@
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 static void kgdbts_run_tests(void)
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 {
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 	char *ptr;
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-	int fork_test = 0;
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+	int clone_test = 0;
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 	int do_sys_open_test = 0;
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 	int sstep_test = 1000;
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 	int nmi_sleep = 0;
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@@ -994,7 +982,7 @@
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 	ptr = strchr(config, 'F');
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 	if (ptr)
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-		fork_test = simple_strtol(ptr + 1, NULL, 10);
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+		clone_test = simple_strtol(ptr + 1, NULL, 10);
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 	ptr = strchr(config, 'S');
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 	if (ptr)
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 		do_sys_open_test = simple_strtol(ptr + 1, NULL, 10);
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@@ -1038,16 +1026,16 @@
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 		run_nmi_sleep_test(nmi_sleep);
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 	}
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-	/* If the do_fork test is run it will be the last test that is
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+	/* If the kernel_clone test is run it will be the last test that is
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 	 * executed because a kernel thread will be spawned at the very
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 	 * end to unregister the debug hooks.
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 	 */
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-	if (fork_test) {
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-		repeat_test = fork_test;
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-		printk(KERN_INFO "kgdbts:RUN do_fork for %i breakpoints\n",
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+	if (clone_test) {
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+		repeat_test = clone_test;
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+		printk(KERN_INFO "kgdbts:RUN kernel_clone for %i breakpoints\n",
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 			repeat_test);
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 		kthread_run(kgdbts_unreg_thread, NULL, "kgdbts_unreg");
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-		run_do_fork_test();
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+		run_kernel_clone_test();
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 		return;
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 	}
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@@ -1072,10 +1060,10 @@
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 {
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 	if (strlen(opt) >= MAX_CONFIG_LEN) {
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 		printk(KERN_ERR "kgdbts: config string too long\n");
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-		return -ENOSPC;
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+		return 1;
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 	}
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 	strcpy(config, opt);
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-	return 0;
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+	return 1;
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 }
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 __setup("kgdbts=", kgdbts_option_setup);