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Commit 9746e467 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'kgdb-fixes-4.20-rc3' of https://git.linaro.org/people/daniel.thompson/linux 

Pull kgdb fixes from Daniel Thompson:
 "The most important changes here are two fixes for kdb regressions
  causes by the hashing of %p pointers together with a fix for a
  potential overflow in kdb tab completion handling (and warning fix).

  Also included are a set of changes in preparation to (eventually)
  enable -Wimplicit-fallthrough"

* tag 'kgdb-fixes-4.20-rc3' of https://git.linaro.org/people/daniel.thompson/linux:
  kdb: kdb_support: mark expected switch fall-throughs
  kdb: kdb_keyboard: mark expected switch fall-throughs
  kdb: kdb_main: refactor code in kdb_md_line
  kdb: Use strscpy with destination buffer size
  kdb: print real address of pointers instead of hashed addresses
  kdb: use correct pointer when 'btc' calls 'btt'
parents e4c4b0e4 646558ff

kernel/debug/kdb/kdb_bt.c

+2 −2
Original line number Diff line number Diff line
@@ -179,14 +179,14 @@ kdb_bt(int argc, const char **argv) 
				kdb_printf("no process for cpu %ld\n", cpu);

				return 0;

			}

			sprintf(buf, "btt 0x%p\n", KDB_TSK(cpu));

			sprintf(buf, "btt 0x%px\n", KDB_TSK(cpu));

			kdb_parse(buf);

			return 0;

		}

		kdb_printf("btc: cpu status: ");

		kdb_parse("cpu\n");

		for_each_online_cpu(cpu) {

			sprintf(buf, "btt 0x%p\n", KDB_TSK(cpu));

			sprintf(buf, "btt 0x%px\n", KDB_TSK(cpu));

			kdb_parse(buf);

			touch_nmi_watchdog();

		}

kernel/debug/kdb/kdb_io.c

+9 −6
Original line number Diff line number Diff line
@@ -216,7 +216,7 @@ static char *kdb_read(char *buffer, size_t bufsize) 
	int count;

	int i;

	int diag, dtab_count;

	int key;

	int key, buf_size, ret;





	diag = kdbgetintenv("DTABCOUNT", &dtab_count);
@@ -336,9 +336,8 @@ static char *kdb_read(char *buffer, size_t bufsize) 
		else

			p_tmp = tmpbuffer;

		len = strlen(p_tmp);

		count = kallsyms_symbol_complete(p_tmp,

						 sizeof(tmpbuffer) -

						 (p_tmp - tmpbuffer));

		buf_size = sizeof(tmpbuffer) - (p_tmp - tmpbuffer);

		count = kallsyms_symbol_complete(p_tmp, buf_size);

		if (tab == 2 && count > 0) {

			kdb_printf("\n%d symbols are found.", count);

			if (count > dtab_count) {
@@ -350,9 +349,13 @@ static char *kdb_read(char *buffer, size_t bufsize) 
			}

			kdb_printf("\n");

			for (i = 0; i < count; i++) {

				if (WARN_ON(!kallsyms_symbol_next(p_tmp, i)))

				ret = kallsyms_symbol_next(p_tmp, i, buf_size);

				if (WARN_ON(!ret))

					break;

				if (ret != -E2BIG)

					kdb_printf("%s ", p_tmp);

				else

					kdb_printf("%s... ", p_tmp);

				*(p_tmp + len) = '\0';

			}

			if (i >= dtab_count)

kernel/debug/kdb/kdb_keyboard.c

+2 −2
Original line number Diff line number Diff line
@@ -173,11 +173,11 @@ int kdb_get_kbd_char(void) 
	case KT_LATIN:

		if (isprint(keychar))

			break;		/* printable characters */

		/* drop through */

		/* fall through */

	case KT_SPEC:

		if (keychar == K_ENTER)

			break;

		/* drop through */

		/* fall through */

	default:

		return -1;	/* ignore unprintables */

	}

kernel/debug/kdb/kdb_main.c

+10 −25
Original line number Diff line number Diff line
@@ -1192,7 +1192,7 @@ static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs, 
	if (reason == KDB_REASON_DEBUG) {

		/* special case below */

	} else {

		kdb_printf("\nEntering kdb (current=0x%p, pid %d) ",

		kdb_printf("\nEntering kdb (current=0x%px, pid %d) ",

			   kdb_current, kdb_current ? kdb_current->pid : 0);

#if defined(CONFIG_SMP)

		kdb_printf("on processor %d ", raw_smp_processor_id());
@@ -1208,7 +1208,7 @@ static int kdb_local(kdb_reason_t reason, int error, struct pt_regs *regs, 
		 */

		switch (db_result) {

		case KDB_DB_BPT:

			kdb_printf("\nEntering kdb (0x%p, pid %d) ",

			kdb_printf("\nEntering kdb (0x%px, pid %d) ",

				   kdb_current, kdb_current->pid);

#if defined(CONFIG_SMP)

			kdb_printf("on processor %d ", raw_smp_processor_id());
@@ -1493,6 +1493,7 @@ static void kdb_md_line(const char *fmtstr, unsigned long addr, 
	char cbuf[32];

	char *c = cbuf;

	int i;

	int j;

	unsigned long word;



	memset(cbuf, '\0', sizeof(cbuf));
@@ -1538,25 +1539,9 @@ static void kdb_md_line(const char *fmtstr, unsigned long addr, 
			wc.word = word;

#define printable_char(c) \

	({unsigned char __c = c; isascii(__c) && isprint(__c) ? __c : '.'; })

			switch (bytesperword) {

			case 8:

				*c++ = printable_char(*cp++);

				*c++ = printable_char(*cp++);

				*c++ = printable_char(*cp++);

			for (j = 0; j < bytesperword; j++)

				*c++ = printable_char(*cp++);

				addr += 4;

			case 4:

				*c++ = printable_char(*cp++);

				*c++ = printable_char(*cp++);

				addr += 2;

			case 2:

				*c++ = printable_char(*cp++);

				addr++;

			case 1:

				*c++ = printable_char(*cp++);

				addr++;

				break;

			}

			addr += bytesperword;

#undef printable_char

		}

	}
@@ -2048,7 +2033,7 @@ static int kdb_lsmod(int argc, const char **argv) 
		if (mod->state == MODULE_STATE_UNFORMED)

			continue;



		kdb_printf("%-20s%8u  0x%p ", mod->name,

		kdb_printf("%-20s%8u  0x%px ", mod->name,

			   mod->core_layout.size, (void *)mod);

#ifdef CONFIG_MODULE_UNLOAD

		kdb_printf("%4d ", module_refcount(mod));
@@ -2059,7 +2044,7 @@ static int kdb_lsmod(int argc, const char **argv) 
			kdb_printf(" (Loading)");

		else

			kdb_printf(" (Live)");

		kdb_printf(" 0x%p", mod->core_layout.base);

		kdb_printf(" 0x%px", mod->core_layout.base);



#ifdef CONFIG_MODULE_UNLOAD

		{
@@ -2341,7 +2326,7 @@ void kdb_ps1(const struct task_struct *p) 
		return;



	cpu = kdb_process_cpu(p);

	kdb_printf("0x%p %8d %8d  %d %4d   %c  0x%p %c%s\n",

	kdb_printf("0x%px %8d %8d  %d %4d   %c  0x%px %c%s\n",

		   (void *)p, p->pid, p->parent->pid,

		   kdb_task_has_cpu(p), kdb_process_cpu(p),

		   kdb_task_state_char(p),
@@ -2354,7 +2339,7 @@ void kdb_ps1(const struct task_struct *p) 
		} else {

			if (KDB_TSK(cpu) != p)

				kdb_printf("  Error: does not match running "

				   "process table (0x%p)\n", KDB_TSK(cpu));

				   "process table (0x%px)\n", KDB_TSK(cpu));

		}

	}

}
@@ -2687,7 +2672,7 @@ int kdb_register_flags(char *cmd, 
	for_each_kdbcmd(kp, i) {

		if (kp->cmd_name && (strcmp(kp->cmd_name, cmd) == 0)) {

			kdb_printf("Duplicate kdb command registered: "

				"%s, func %p help %s\n", cmd, func, help);

				"%s, func %px help %s\n", cmd, func, help);

			return 1;

		}

	}

kernel/debug/kdb/kdb_private.h

+1 −1
Original line number Diff line number Diff line
@@ -83,7 +83,7 @@ typedef struct __ksymtab { 
		unsigned long sym_start;

		unsigned long sym_end;

		} kdb_symtab_t;

extern int kallsyms_symbol_next(char *prefix_name, int flag);

extern int kallsyms_symbol_next(char *prefix_name, int flag, int buf_size);

extern int kallsyms_symbol_complete(char *prefix_name, int max_len);



/* Exported Symbols for kernel loadable modules to use. */