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CTRY:IE; LANG:en; SCL:1; SRV:; IPV:CAL; SFV:NSPM; H:64aa7808-outbound-1.mta.getcheckrecipient.com; PTR:ec2-63-35-35-123.eu-west-1.compute.amazonaws.com; CAT:NONE; SFS:(4636009)(39860400002)(136003)(376002)(396003)(346002)(46966006)(36840700001)(47076005)(186003)(110136005)(86362001)(36860700001)(8676002)(33656002)(5660300002)(478600001)(7696005)(450100002)(52536014)(83380400001)(82310400003)(82740400003)(336012)(26005)(2906002)(81166007)(55016002)(356005)(316002)(4326008)(70586007)(6506007)(70206006)(54906003)(8936002)(9686003); DIR:OUT; SFP:1101; X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 02 Apr 2021 04:35:01.0849 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: d321af3e-4b08-47ec-0376-08d8f590adaf X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d; Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: DB5EUR03FT061.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM6PR08MB5109 Subject: Re: [dpdk-dev] [PATCH v2] eal: fix race in ctrl thread creation X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" >=20 > As reported by Luc, there is a race where the barrier is destroyed by one > thread, while the other thread did not yet leave pthread_barrier_wait. Please correct me if I am wrong. We are using the pthread_barrier to 1) know when to free 'params'. 2) set the thread affinity before the thread starts running its function I think this patch is fine. But, it can be simplified. >=20 > This patch fixes the race condition by adding an atomic counter to ensure > that the barrier is destroyed only it is not used by any thread. >=20 > Fixes: 3a0d465d4c53 ("eal: fix use-after-free on control thread creation"= ) > Cc: jianfeng.tan@intel.com > Cc: stable@dpdk.org >=20 > Reported-by: Luc Pelletier > Signed-off-by: David Marchand > Signed-off-by: Olivier Matz > --- >=20 > Hi Luc, >=20 > Thank you for reporting this problem and submitting the patch. > I think the issue can be fixed without any loop, like in this patch. What= do > you think? >=20 > Regards, > Olivier >=20 >=20 > lib/librte_eal/common/eal_common_thread.c | 38 +++++++++++++---------- > 1 file changed, 21 insertions(+), 17 deletions(-) >=20 > diff --git a/lib/librte_eal/common/eal_common_thread.c > b/lib/librte_eal/common/eal_common_thread.c > index 73a055902a..891f825e87 100644 > --- a/lib/librte_eal/common/eal_common_thread.c > +++ b/lib/librte_eal/common/eal_common_thread.c > @@ -170,11 +170,11 @@ struct rte_thread_ctrl_params { > void *(*start_routine)(void *); > void *arg; > pthread_barrier_t configured; We can get rid of the barrier variable. The 'barrier_refcnt' is enough to k= now when to free the memory. Setting the thread affinity can be moved to 'ctrl_thread_init' function. > + unsigned int barrier_refcnt; > }; >=20 > static void *ctrl_thread_init(void *arg) { > - int ret; > struct internal_config *internal_conf =3D > eal_get_internal_configuration(); > rte_cpuset_t *cpuset =3D &internal_conf->ctrl_cpuset; @@ -184,8 > +184,9 @@ static void *ctrl_thread_init(void *arg) >=20 > __rte_thread_init(rte_lcore_id(), cpuset); >=20 > - ret =3D pthread_barrier_wait(¶ms->configured); > - if (ret =3D=3D PTHREAD_BARRIER_SERIAL_THREAD) { > + pthread_barrier_wait(¶ms->configured); > + if (__atomic_sub_fetch(¶ms->barrier_refcnt, 1, > + __ATOMIC_ACQ_REL) =3D=3D 0) { > pthread_barrier_destroy(¶ms->configured); > free(params); > } > @@ -210,15 +211,17 @@ rte_ctrl_thread_create(pthread_t *thread, const > char *name, >=20 > params->start_routine =3D start_routine; > params->arg =3D arg; > - > - pthread_barrier_init(¶ms->configured, NULL, 2); > - > - ret =3D pthread_create(thread, attr, ctrl_thread_init, (void *)params); > + __atomic_store_n(¶ms->barrier_refcnt, 2, > __ATOMIC_RELEASE); We can use __ATOMIC_RELAXED or just a simple assignment as pthread_create e= nsures that all the earlier memory writes are visible to the 'ctrl_thread_i= nit'. > + ret =3D pthread_barrier_init(¶ms->configured, NULL, 2); > if (ret !=3D 0) { > free(params); > return -ret; > } >=20 > + ret =3D pthread_create(thread, attr, ctrl_thread_init, (void *)params); > + if (ret !=3D 0) > + goto fail; > + > if (name !=3D NULL) { > ret =3D rte_thread_setname(*thread, name); > if (ret < 0) > @@ -227,25 +230,26 @@ rte_ctrl_thread_create(pthread_t *thread, const > char *name, > } >=20 > ret =3D pthread_setaffinity_np(*thread, sizeof(*cpuset), cpuset); I think this can be moved to 'ctrl_thread_init'. > - if (ret) > - goto fail; > + if (ret !=3D 0) > + goto fail_cancel; >=20 > - ret =3D pthread_barrier_wait(¶ms->configured); > - if (ret =3D=3D PTHREAD_BARRIER_SERIAL_THREAD) { > + pthread_barrier_wait(¶ms->configured); > + if (__atomic_sub_fetch(¶ms->barrier_refcnt, 1, > + __ATOMIC_ACQ_REL) =3D=3D 0) { > pthread_barrier_destroy(¶ms->configured); > free(params); > } >=20 > return 0; >=20 > -fail: > - if (PTHREAD_BARRIER_SERIAL_THREAD =3D=3D > - pthread_barrier_wait(¶ms->configured)) { > - pthread_barrier_destroy(¶ms->configured); > - free(params); > - } > +fail_cancel: > pthread_cancel(*thread); > pthread_join(*thread, NULL); > + > +fail: > + pthread_barrier_destroy(¶ms->configured); > + free(params); > + > return -ret; > } >=20 > -- > 2.29.2