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perf thread: convert thread.refcnt from atomic_t to refcount_t 

The refcount_t type and corresponding API should be used instead of atomic_t
when the variable is used as a reference counter.

This allows to avoid accidental refcounter overflows that might lead to
use-after-free situations.

Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: David Windsor <dwindsor@gmail.com>
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Kees Kook <keescook@chromium.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: David Windsor <dwindsor@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Hans Liljestrand <ishkamiel@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kees Kook <keescook@chromium.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Matija Glavinic Pecotic <matija.glavinic-pecotic.ext@nokia.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: alsa-devel@alsa-project.org
Link: http://lkml.kernel.org/r/1487691303-31858-9-git-send-email-elena.reshetova@intel.com
[ Did missing conversion in __machine__remove_thread() ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Elena Reshetova 2017-02-21 17:35:02 +02:00 committed by Arnaldo Carvalho de Melo
parent 25a3720cf4
commit e34f5b11cd
3 changed files with 6 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
tools/perf/util/machine.c
View File

@ -1439,7 +1439,7 @@ static void __machine__remove_thread(struct machine *machine, struct thread *th,
if (machine->last_match == th)
machine->last_match = NULL;
BUG_ON(atomic_read(&th->refcnt) == 0);
BUG_ON(refcount_read(&th->refcnt) == 0);
if (lock)
pthread_rwlock_wrlock(&machine->threads_lock);
rb_erase_init(&th->rb_node, &machine->threads);

6
tools/perf/util/thread.c
View File

@ -53,7 +53,7 @@ struct thread *thread__new(pid_t pid, pid_t tid)
goto err_thread;
list_add(&comm->list, &thread->comm_list);
atomic_set(&thread->refcnt, 1);
refcount_set(&thread->refcnt, 1);
RB_CLEAR_NODE(&thread->rb_node);
}
@ -88,13 +88,13 @@ void thread__delete(struct thread *thread)
struct thread *thread__get(struct thread *thread)
{
if (thread)
atomic_inc(&thread->refcnt);
refcount_inc(&thread->refcnt);
return thread;
}
void thread__put(struct thread *thread)
{
if (thread && atomic_dec_and_test(&thread->refcnt)) {
if (thread && refcount_dec_and_test(&thread->refcnt)) {
/*
* Remove it from the dead_threads list, as last reference
* is gone.

4
tools/perf/util/thread.h
View File

@ -1,7 +1,7 @@
#ifndef __PERF_THREAD_H
#define __PERF_THREAD_H
#include <linux/atomic.h>
#include <linux/refcount.h>
#include <linux/rbtree.h>
#include <linux/list.h>
#include <unistd.h>
@ -23,7 +23,7 @@ struct thread {
pid_t tid;
pid_t ppid;
int cpu;
atomic_t refcnt;
refcount_t refcnt;
char shortname[3];
bool comm_set;
int comm_len;