kgdb patches for 6.13

A relatively modest collection of changes:
 
 * Adopt kstrtoint() and kstrtol() instead of the simple_strtoXX family
   for better error checking of user input.
 * Align the print behavour when breakpoints are enabled and disabled by
   adopting the current behaviour of breakpoint disable for both.
 * Remove some of the (rather odd and user hostile) hex fallbacks and
   require kdb users to prefix with 0x instead.
 * Tidy up (and fix) control code handling in kdb's keyboard code. This
   makes the control code handling at the keyboard behave the same way
   as it does via the UART.
 * Switch my own entry in MAINTAINERS to my @kernel.org address.
 
 Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
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Merge tag 'kgdb-6.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux

Pull kgdb updates from Daniel Thompson:
 "A relatively modest collection of changes:

   - Adopt kstrtoint() and kstrtol() instead of the simple_strtoXX
     family for better error checking of user input.

   - Align the print behavour when breakpoints are enabled and disabled
     by adopting the current behaviour of breakpoint disable for both.

   - Remove some of the (rather odd and user hostile) hex fallbacks and
     require kdb users to prefix with 0x instead.

   - Tidy up (and fix) control code handling in kdb's keyboard code.
     This makes the control code handling at the keyboard behave the
     same way as it does via the UART.

   - Switch my own entry in MAINTAINERS to my @kernel.org address"

* tag 'kgdb-6.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux:
  kdb: fix ctrl+e/a/f/b/d/p/n broken in keyboard mode
  MAINTAINERS: Use Daniel Thompson's korg address for kgdb work
  kdb: Fix breakpoint enable to be silent if already enabled
  kdb: Remove fallback interpretation of arbitrary numbers as hex
  trace: kdb: Replace simple_strtoul with kstrtoul in kdb_ftdump
  kdb: Replace the use of simple_strto with safer kstrto in kdb_main

MAINTAINERS

@@ -12670,7 +12670,7 @@ F:	samples/kfifo/
 
 KGDB / KDB /debug_core
 M:	Jason Wessel <jason.wessel@windriver.com>
-M:	Daniel Thompson <daniel.thompson@linaro.org>
+M:	Daniel Thompson <danielt@kernel.org>
 R:	Douglas Anderson <dianders@chromium.org>
 L:	kgdb-bugreport@lists.sourceforge.net
 S:	Maintained

kernel/debug/kdb/kdb_bp.c

@@ -460,13 +460,15 @@ static int kdb_bc(int argc, const char **argv)
 
 			break;
 		case KDBCMD_BE:
+			if (bp->bp_enabled)
+				break;
+
 			bp->bp_enabled = 1;
 
 			kdb_printf("Breakpoint %d at "
-				   kdb_bfd_vma_fmt " enabled",
+				   kdb_bfd_vma_fmt " enabled\n",
 				   i, bp->bp_addr);
 
-			kdb_printf("\n");
 			break;
 		case KDBCMD_BD:
 			if (!bp->bp_enabled)

kernel/debug/kdb/kdb_keyboard.c

@@ -25,6 +25,8 @@
 #define KBD_STAT_OBF 		0x01	/* Keyboard output buffer full */
 #define KBD_STAT_MOUSE_OBF	0x20	/* Mouse output buffer full */
 
+#define CTRL(c) ((c) - 64)
+
 static int kbd_exists;
 static int kbd_last_ret;
 
@@ -123,24 +125,24 @@ int kdb_get_kbd_char(void)
 		return 8;
 	}
 
-	/* Special Key */
+	/* Translate special keys to equivalent CTRL control characters */
 	switch (scancode) {
 	case 0xF: /* Tab */
-		return 9;
+		return CTRL('I');
 	case 0x53: /* Del */
-		return 4;
+		return CTRL('D');
 	case 0x47: /* Home */
-		return 1;
+		return CTRL('A');
 	case 0x4F: /* End */
-		return 5;
+		return CTRL('E');
 	case 0x4B: /* Left */
-		return 2;
+		return CTRL('B');
 	case 0x48: /* Up */
-		return 16;
+		return CTRL('P');
 	case 0x50: /* Down */
-		return 14;
+		return CTRL('N');
 	case 0x4D: /* Right */
-		return 6;
+		return CTRL('F');
 	}
 
 	if (scancode == 0xe0)
@@ -172,6 +174,19 @@ int kdb_get_kbd_char(void)
 	switch (KTYP(keychar)) {
 	case KT_LETTER:
 	case KT_LATIN:
+		switch (keychar) {
+		/* non-printable supported control characters */
+		case CTRL('A'): /* Home */
+		case CTRL('B'): /* Left */
+		case CTRL('D'): /* Del */
+		case CTRL('E'): /* End */
+		case CTRL('F'): /* Right */
+		case CTRL('I'): /* Tab */
+		case CTRL('N'): /* Down */
+		case CTRL('P'): /* Up */
+			return keychar;
+		}
+
 		if (isprint(keychar))
 			break;		/* printable characters */
 		fallthrough;

kernel/debug/kdb/kdb_main.c

@@ -306,8 +306,8 @@ static int kdbgetulenv(const char *match, unsigned long *value)
 		return KDB_NOTENV;
 	if (strlen(ep) == 0)
 		return KDB_NOENVVALUE;
-
+	if (kstrtoul(ep, 0, value))
-	*value = simple_strtoul(ep, NULL, 0);
+		return KDB_BADINT;
 
 	return 0;
 }
@@ -402,42 +402,15 @@ static void kdb_printenv(void)
  */
 int kdbgetularg(const char *arg, unsigned long *value)
 {
-	char *endp;
+	if (kstrtoul(arg, 0, value))
-	unsigned long val;
+		return KDB_BADINT;
-
-	val = simple_strtoul(arg, &endp, 0);
-
-	if (endp == arg) {
-		/*
-		 * Also try base 16, for us folks too lazy to type the
-		 * leading 0x...
-		 */
-		val = simple_strtoul(arg, &endp, 16);
-		if (endp == arg)
-			return KDB_BADINT;
-	}
-
-	*value = val;
-
 	return 0;
 }
 
 int kdbgetu64arg(const char *arg, u64 *value)
 {
-	char *endp;
+	if (kstrtou64(arg, 0, value))
-	u64 val;
+		return KDB_BADINT;
-
-	val = simple_strtoull(arg, &endp, 0);
-
-	if (endp == arg) {
-
-		val = simple_strtoull(arg, &endp, 16);
-		if (endp == arg)
-			return KDB_BADINT;
-	}
-
-	*value = val;
-
 	return 0;
 }
 
@@ -473,10 +446,10 @@ int kdb_set(int argc, const char **argv)
 	 */
 	if (strcmp(argv[1], "KDBDEBUG") == 0) {
 		unsigned int debugflags;
-		char *cp;
+		int ret;
 
-		debugflags = simple_strtoul(argv[2], &cp, 0);
+		ret = kstrtouint(argv[2], 0, &debugflags);
-		if (cp == argv[2] || debugflags & ~KDB_DEBUG_FLAG_MASK) {
+		if (ret || debugflags & ~KDB_DEBUG_FLAG_MASK) {
 			kdb_printf("kdb: illegal debug flags '%s'\n",
 				    argv[2]);
 			return 0;
@@ -1619,10 +1592,10 @@ static int kdb_md(int argc, const char **argv)
 		if (!argv[0][3])
 			valid = 1;
 		else if (argv[0][3] == 'c' && argv[0][4]) {
-			char *p;
+			if (kstrtouint(argv[0] + 4, 10, &repeat))
-			repeat = simple_strtoul(argv[0] + 4, &p, 10);
+				return KDB_BADINT;
 			mdcount = ((repeat * bytesperword) + 15) / 16;
-			valid = !*p;
+			valid = 1;
 		}
 		last_repeat = repeat;
 	} else if (strcmp(argv[0], "md") == 0)
@@ -2083,15 +2056,10 @@ static int kdb_dmesg(int argc, const char **argv)
 	if (argc > 2)
 		return KDB_ARGCOUNT;
 	if (argc) {
-		char *cp;
+		if (kstrtoint(argv[1], 0, &lines))
-		lines = simple_strtol(argv[1], &cp, 0);
-		if (*cp)
 			lines = 0;
-		if (argc > 1) {
+		if (argc > 1 && (kstrtoint(argv[2], 0, &adjust) || adjust < 0))
-			adjust = simple_strtoul(argv[2], &cp, 0);
+			adjust = 0;
-			if (*cp || adjust < 0)
-				adjust = 0;
-		}
 	}
 
 	/* disable LOGGING if set */
@@ -2428,14 +2396,12 @@ static int kdb_help(int argc, const char **argv)
 static int kdb_kill(int argc, const char **argv)
 {
 	long sig, pid;
-	char *endp;
 	struct task_struct *p;
 
 	if (argc != 2)
 		return KDB_ARGCOUNT;
 
-	sig = simple_strtol(argv[1], &endp, 0);
+	if (kstrtol(argv[1], 0, &sig))
-	if (*endp)
 		return KDB_BADINT;
 	if ((sig >= 0) || !valid_signal(-sig)) {
 		kdb_printf("Invalid signal parameter.<-signal>\n");
@@ -2443,8 +2409,7 @@ static int kdb_kill(int argc, const char **argv)
 	}
 	sig = -sig;
 
-	pid = simple_strtol(argv[2], &endp, 0);
+	if (kstrtol(argv[2], 0, &pid))
-	if (*endp)
 		return KDB_BADINT;
 	if (pid <= 0) {
 		kdb_printf("Process ID must be large than 0.\n");

kernel/trace/trace_kdb.c

@@ -96,22 +96,19 @@ static int kdb_ftdump(int argc, const char **argv)
 {
 	int skip_entries = 0;
 	long cpu_file;
-	char *cp;
+	int err;
 	int cnt;
 	int cpu;
 
 	if (argc > 2)
 		return KDB_ARGCOUNT;
 
-	if (argc) {
+	if (argc && kstrtoint(argv[1], 0, &skip_entries))
-		skip_entries = simple_strtol(argv[1], &cp, 0);
+		return KDB_BADINT;
-		if (*cp)
-			skip_entries = 0;
-	}
 
 	if (argc == 2) {
-		cpu_file = simple_strtol(argv[2], &cp, 0);
+		err = kstrtol(argv[2], 0, &cpu_file);
-		if (*cp || cpu_file >= NR_CPUS || cpu_file < 0 ||
+		if (err || cpu_file >= NR_CPUS || cpu_file < 0 ||
 		    !cpu_online(cpu_file))
 			return KDB_BADINT;
 	} else {