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Commit 6a71398c authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge tag 'trace-v5.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace 

Pull tracing fixes from Steven Rostedt:

 - Out of range read of stack trace output

 - Fix for NULL pointer dereference in trace_uprobe_create()

 - Fix to a livepatching / ftrace permission race in the module code

 - Fix for NULL pointer dereference in free_ftrace_func_mapper()

 - A couple of build warning clean ups

* tag 'trace-v5.2-rc4' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  ftrace: Fix NULL pointer dereference in free_ftrace_func_mapper()
  module: Fix livepatch/ftrace module text permissions race
  tracing/uprobe: Fix obsolete comment on trace_uprobe_create()
  tracing/uprobe: Fix NULL pointer dereference in trace_uprobe_create()
  tracing: Make two symbols static
  tracing: avoid build warning with HAVE_NOP_MCOUNT
  tracing: Fix out-of-range read in trace_stack_print()
parents 0011572c 04e03d9a

kernel/livepatch/core.c

+6 −0
Original line number Diff line number Diff line
@@ -18,6 +18,7 @@ 
#include <linux/elf.h>

#include <linux/moduleloader.h>

#include <linux/completion.h>

#include <linux/memory.h>

#include <asm/cacheflush.h>

#include "core.h"

#include "patch.h"
@@ -718,16 +719,21 @@ static int klp_init_object_loaded(struct klp_patch *patch, 
	struct klp_func *func;

	int ret;



	mutex_lock(&text_mutex);



	module_disable_ro(patch->mod);

	ret = klp_write_object_relocations(patch->mod, obj);

	if (ret) {

		module_enable_ro(patch->mod, true);

		mutex_unlock(&text_mutex);

		return ret;

	}



	arch_klp_init_object_loaded(patch, obj);

	module_enable_ro(patch->mod, true);



	mutex_unlock(&text_mutex);



	klp_for_each_func(obj, func) {

		ret = klp_find_object_symbol(obj->name, func->old_name,

					     func->old_sympos,

kernel/trace/ftrace.c

+16 −6
Original line number Diff line number Diff line
@@ -34,6 +34,7 @@ 
#include <linux/hash.h>

#include <linux/rcupdate.h>

#include <linux/kprobes.h>

#include <linux/memory.h>



#include <trace/events/sched.h>
@@ -2610,10 +2611,12 @@ static void ftrace_run_update_code(int command) 
{

	int ret;



	mutex_lock(&text_mutex);



	ret = ftrace_arch_code_modify_prepare();

	FTRACE_WARN_ON(ret);

	if (ret)

		return;

		goto out_unlock;



	/*

	 * By default we use stop_machine() to modify the code.
@@ -2625,6 +2628,9 @@ static void ftrace_run_update_code(int command) 


	ret = ftrace_arch_code_modify_post_process();

	FTRACE_WARN_ON(ret);



out_unlock:

	mutex_unlock(&text_mutex);

}



static void ftrace_run_modify_code(struct ftrace_ops *ops, int command,
@@ -2935,14 +2941,13 @@ static int ftrace_update_code(struct module *mod, struct ftrace_page *new_pgs) 
			p = &pg->records[i];

			p->flags = rec_flags;



#ifndef CC_USING_NOP_MCOUNT

			/*

			 * Do the initial record conversion from mcount jump

			 * to the NOP instructions.

			 */

			if (!ftrace_code_disable(mod, p))

			if (!__is_defined(CC_USING_NOP_MCOUNT) &&

			    !ftrace_code_disable(mod, p))

				break;

#endif



			update_cnt++;

		}
@@ -4221,10 +4226,13 @@ void free_ftrace_func_mapper(struct ftrace_func_mapper *mapper, 
	struct ftrace_func_entry *entry;

	struct ftrace_func_map *map;

	struct hlist_head *hhd;

	int size = 1 << mapper->hash.size_bits;

	int i;

	int size, i;



	if (!mapper)

		return;



	if (free_func && mapper->hash.count) {

		size = 1 << mapper->hash.size_bits;

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

			hhd = &mapper->hash.buckets[i];

			hlist_for_each_entry(entry, hhd, hlist) {
@@ -5776,6 +5784,7 @@ void ftrace_module_enable(struct module *mod) 
	struct ftrace_page *pg;



	mutex_lock(&ftrace_lock);

	mutex_lock(&text_mutex);



	if (ftrace_disabled)

		goto out_unlock;
@@ -5837,6 +5846,7 @@ void ftrace_module_enable(struct module *mod) 
		ftrace_arch_code_modify_post_process();



 out_unlock:

	mutex_unlock(&text_mutex);

	mutex_unlock(&ftrace_lock);



	process_cached_mods(mod->name);

kernel/trace/trace.c

+2 −2
Original line number Diff line number Diff line
@@ -6923,7 +6923,7 @@ struct tracing_log_err { 


static DEFINE_MUTEX(tracing_err_log_lock);



struct tracing_log_err *get_tracing_log_err(struct trace_array *tr)

static struct tracing_log_err *get_tracing_log_err(struct trace_array *tr)

{

	struct tracing_log_err *err;
@@ -8192,7 +8192,7 @@ static const struct file_operations buffer_percent_fops = { 
	.llseek		= default_llseek,

};



struct dentry *trace_instance_dir;

static struct dentry *trace_instance_dir;



static void

init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer);

kernel/trace/trace_output.c

+1 −1
Original line number Diff line number Diff line
@@ -1057,7 +1057,7 @@ static enum print_line_t trace_stack_print(struct trace_iterator *iter, 


	trace_seq_puts(s, "<stack trace>\n");



	for (p = field->caller; p && *p != ULONG_MAX && p < end; p++) {

	for (p = field->caller; p && p < end && *p != ULONG_MAX; p++) {



		if (trace_seq_has_overflowed(s))

			break;

kernel/trace/trace_uprobe.c

+10 −5
Original line number Diff line number Diff line
@@ -426,8 +426,6 @@ static int register_trace_uprobe(struct trace_uprobe *tu) 
/*

 * Argument syntax:

 *  - Add uprobe: p|r[:[GRP/]EVENT] PATH:OFFSET [FETCHARGS]

 *

 *  - Remove uprobe: -:[GRP/]EVENT

 */

static int trace_uprobe_create(int argc, const char **argv)

{
@@ -443,10 +441,17 @@ static int trace_uprobe_create(int argc, const char **argv) 
	ret = 0;

	ref_ctr_offset = 0;



	/* argc must be >= 1 */

	if (argv[0][0] == 'r')

	switch (argv[0][0]) {

	case 'r':

		is_return = true;

	else if (argv[0][0] != 'p' || argc < 2)

		break;

	case 'p':

		break;

	default:

		return -ECANCELED;

	}



	if (argc < 2)

		return -ECANCELED;



	if (argv[0][1] == ':')