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This includes the following fixes:

Browse source 
- 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
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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()
This commit is contained in:
Linus Torvalds 2019-06-15 07:24:11 -10:00
commit 6a71398c6a
5 changed files with 35 additions and 14 deletions
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6
kernel/livepatch/core.c
View file

@ -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,