From: Alexey Izbyshev <izbyshev@ispras.ru>
To: musl@lists.openwall.com
Subject: Re: [musl] [PATCH] mq_notify: fix close/recv race on failure path
Date: Sat, 11 Feb 2023 20:50:15 +0300 [thread overview]
Message-ID: <2da3840a9345c0a810e9d93ab4f6bca7@ispras.ru> (raw)
In-Reply-To: <20230211171338.GD1903@voyager>
On 2023-02-11 20:13, Markus Wichmann wrote:
> On Sat, Feb 11, 2023 at 10:06:03AM -0500, Rich Felker wrote:
>> --- a/src/thread/pthread_detach.c
>> +++ b/src/thread/pthread_detach.c
>> @@ -5,8 +5,12 @@ static int __pthread_detach(pthread_t t)
>> {
>> /* If the cas fails, detach state is either already-detached
>> * or exiting/exited, and pthread_join will trap or cleanup. */
>> - if (a_cas(&t->detach_state, DT_JOINABLE, DT_DETACHED) !=
>> DT_JOINABLE)
>> + if (a_cas(&t->detach_state, DT_JOINABLE, DT_DETACHED) !=
>> DT_JOINABLE) {
>> + int cs;
>> + __pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &cs);
>> return __pthread_join(t, 0);
> ^^^^^^ I think you forgot to rework this.
>> + __pthread_setcancelstate(cs, 0);
>> + }
>> return 0;
>> }
>>
>
> I see no other obvious missteps, though.
>
Same here, apart from this and misspelled "pthred_detach" in the commit
message, the patches look good to me.
Regarding the POSIX requirement to run sigev_notify_function in the
context of a detached thread, while it's possible to observe the wrong
detachstate for a short while via pthread_getattr_np after these
patches, I'm not sure there is a standard way to do that. Even if it
exists, this minor issue may be not worth caring about.
Thanks,
Alexey
next prev parent reply other threads:[~2023-02-11 17:50 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-11-09 10:46 Alexey Izbyshev
2022-12-14 2:26 ` Rich Felker
2022-12-14 6:49 ` Alexey Izbyshev
2023-02-10 16:29 ` Rich Felker
2023-02-11 14:45 ` Alexey Izbyshev
2023-02-11 14:52 ` Rich Felker
2023-02-11 15:13 ` Alexey Izbyshev
2023-02-11 15:06 ` Rich Felker
2023-02-11 17:13 ` Markus Wichmann
2023-02-11 17:46 ` Rich Felker
2023-02-11 17:50 ` Alexey Izbyshev [this message]
2023-02-11 17:59 ` Rich Felker
2023-02-11 18:08 ` Alexey Izbyshev
2023-02-11 18:35 ` Rich Felker
2023-02-11 19:28 ` Alexey Izbyshev
2023-02-11 19:49 ` Rich Felker
2023-02-11 20:14 ` Alexey Izbyshev
2023-02-12 0:32 ` Rich Felker
2023-02-12 18:23 ` Alexey Izbyshev
2023-02-12 19:35 ` Alexey Izbyshev
2023-02-12 20:04 ` Rich Felker
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