diff mbox

[dpdk-dev,v3] eal: fix use-after-free issue on thread creation

Message ID 1525269134-103270-1-git-send-email-jianfeng.tan@intel.com (mailing list archive)
State Accepted, archived
Headers

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation success Compilation OK

Commit Message

Jianfeng Tan May 2, 2018, 1:52 p.m. UTC 
  After below commit, we encounter some strange issue:
  1) Dead lock as described here:
     http://dpdk.org/ml/archives/dev/2018-April/099806.html
  2) SIGSEGV issue when starting a testpmd in VM.

Considering below commit changes to use dynamic memory instead of
stack for memory barrier, we doubt it's caused by use-after-free.

Fixes: 3d09a6e26d8b ("eal: fix threads block on barrier")

Reported-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Reported-by: Lei Yao <lei.a.yao@intel.com>
Suggested-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
Suggested-by: Olivier Matz <olivier.matz@6wind.com>
---
 v1->v2:
 - Destroy barrier if failure happens.
 v2->v3:
 - Add proper failure handling.
 lib/librte_eal/common/eal_common_thread.c | 20 ++++++++++++++++----
 1 file changed, 16 insertions(+), 4 deletions(-)

Comments

Olivier Matz May 2, 2018, 2:56 p.m. UTC | #1 
On Wed, May 02, 2018 at 01:52:14PM +0000, Jianfeng Tan wrote:
> After below commit, we encounter some strange issue:
>   1) Dead lock as described here:
>      http://dpdk.org/ml/archives/dev/2018-April/099806.html
>   2) SIGSEGV issue when starting a testpmd in VM.
> 
> Considering below commit changes to use dynamic memory instead of
> stack for memory barrier, we doubt it's caused by use-after-free.
> 
> Fixes: 3d09a6e26d8b ("eal: fix threads block on barrier")
> 
> Reported-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> Reported-by: Lei Yao <lei.a.yao@intel.com>
> Suggested-by: Stephen Hemminger <stephen@networkplumber.org>
> Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
> Suggested-by: Olivier Matz <olivier.matz@6wind.com>

Reviewed-by: Olivier Matz <olivier.matz@6wind.com>

Thank you for fixing my stuff :)
Thomas Monjalon May 2, 2018, 3:26 p.m. UTC | #2 
02/05/2018 16:56, Olivier Matz:
> On Wed, May 02, 2018 at 01:52:14PM +0000, Jianfeng Tan wrote:
> > After below commit, we encounter some strange issue:
> >   1) Dead lock as described here:
> >      http://dpdk.org/ml/archives/dev/2018-April/099806.html
> >   2) SIGSEGV issue when starting a testpmd in VM.
> > 
> > Considering below commit changes to use dynamic memory instead of
> > stack for memory barrier, we doubt it's caused by use-after-free.
> > 
> > Fixes: 3d09a6e26d8b ("eal: fix threads block on barrier")
> > 
> > Reported-by: Maxime Coquelin <maxime.coquelin@redhat.com>
> > Reported-by: Lei Yao <lei.a.yao@intel.com>
> > Suggested-by: Stephen Hemminger <stephen@networkplumber.org>
> > Signed-off-by: Jianfeng Tan <jianfeng.tan@intel.com>
> > Suggested-by: Olivier Matz <olivier.matz@6wind.com>
> 
> Reviewed-by: Olivier Matz <olivier.matz@6wind.com>
> 
> Thank you for fixing my stuff :)

Applied, thanks
diff mbox

Patch

diff --git a/lib/librte_eal/common/eal_common_thread.c b/lib/librte_eal/common/eal_common_thread.c
index de69452..cb0855d 100644
--- a/lib/librte_eal/common/eal_common_thread.c
+++ b/lib/librte_eal/common/eal_common_thread.c
@@ -149,11 +149,16 @@  struct rte_thread_ctrl_params {
 
 static void *rte_thread_init(void *arg)
 {
+	int ret;
 	struct rte_thread_ctrl_params *params = arg;
 	void *(*start_routine)(void *) = params->start_routine;
 	void *routine_arg = params->arg;
 
-	pthread_barrier_wait(&params->configured);
+	ret = pthread_barrier_wait(&params->configured);
+	if (ret == PTHREAD_BARRIER_SERIAL_THREAD) {
+		pthread_barrier_destroy(&params->configured);
+		free(params);
+	}
 
 	return start_routine(routine_arg);
 }
@@ -204,14 +209,21 @@  rte_ctrl_thread_create(pthread_t *thread, const char *name,
 	if (ret < 0)
 		goto fail;
 
-	pthread_barrier_wait(&params->configured);
-	free(params);
+	ret = pthread_barrier_wait(&params->configured);
+	if (ret == PTHREAD_BARRIER_SERIAL_THREAD) {
+		pthread_barrier_destroy(&params->configured);
+		free(params);
+	}
 
 	return 0;
 
 fail:
+	if (PTHREAD_BARRIER_SERIAL_THREAD ==
+	    pthread_barrier_wait(&params->configured)) {
+		pthread_barrier_destroy(&params->configured);
+		free(params);
+	}
 	pthread_cancel(*thread);
 	pthread_join(*thread, NULL);
-	free(params);
 	return ret;
 }