From patchwork Wed Feb 27 18:23:54 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Crowe X-Patchwork-Id: 31627 Received: (qmail 109170 invoked by alias); 27 Feb 2019 18:24:53 -0000 Mailing-List: contact libc-alpha-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Unsubscribe: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: libc-alpha-owner@sourceware.org Delivered-To: mailing list libc-alpha@sourceware.org Received: (qmail 108384 invoked by uid 89); 27 Feb 2019 18:24:36 -0000 Authentication-Results: sourceware.org; auth=none X-Spam-SWARE-Status: No, score=-26.6 required=5.0 tests=BAYES_00, GIT_PATCH_0, GIT_PATCH_1, GIT_PATCH_2, GIT_PATCH_3, KAM_LAZY_DOMAIN_SECURITY, RCVD_IN_DNSWL_LOW autolearn=ham version=3.3.2 spammy=H*r:smtp, acquired, 1000000000 X-HELO: avasout02.plus.net X-CM-Score: 0.00 From: Mike Crowe To: libc-alpha@sourceware.org Cc: Mike Crowe Subject: [PATCH 4/7] nptl: pthread_rwlock: Move timeout validation into _full functions Date: Wed, 27 Feb 2019 18:23:54 +0000 Message-Id: <5292325009aa674d78d114d85bdbce94c3aec909.1551291557.git-series.mac@mcrowe.com> In-Reply-To: References: In-Reply-To: References: As recommended by the comments in the implementations of pthread_rwlock_timedrdlock and pthread_rwlock_timedwrlock, let's move the timeout validity checks into the corresponding pthread_rwlock_rdlock_full and pthread_rwlock_wrlock_full functions. Since these functions may be called with abstime == NULL, an extra check for that is necessary too. --- nptl/pthread_rwlock_common.c | 20 ++++++++++++++++++++ nptl/pthread_rwlock_timedrdlock.c | 10 ---------- nptl/pthread_rwlock_timedwrlock.c | 10 ---------- 3 files changed, 20 insertions(+), 20 deletions(-) diff --git a/nptl/pthread_rwlock_common.c b/nptl/pthread_rwlock_common.c index 89ba21a..120b880 100644 --- a/nptl/pthread_rwlock_common.c +++ b/nptl/pthread_rwlock_common.c @@ -282,6 +282,16 @@ __pthread_rwlock_rdlock_full (pthread_rwlock_t *rwlock, { unsigned int r; + /* Make sure any passed in timeout value is valid. Note that the previous + implementation assumed that this check *must* not be performed if there + would in fact be no blocking; however, POSIX only requires that "the + validity of the abstime parameter need not be checked if the lock can be + immediately acquired" (i.e., we need not but may check it). */ + if (abstime + && __glibc_unlikely (abstime->tv_nsec >= 1000000000 + || abstime->tv_nsec < 0)) + return EINVAL; + /* Make sure we are not holding the rwlock as a writer. This is a deadlock situation we recognize and report. */ if (__glibc_unlikely (atomic_load_relaxed (&rwlock->__data.__cur_writer) @@ -576,6 +586,16 @@ static __always_inline int __pthread_rwlock_wrlock_full (pthread_rwlock_t *rwlock, const struct timespec *abstime) { + /* Make sure any passed in timeout value is valid. Note that the previous + implementation assumed that this check *must* not be performed if there + would in fact be no blocking; however, POSIX only requires that "the + validity of the abstime parameter need not be checked if the lock can be + immediately acquired" (i.e., we need not but may check it). */ + if (abstime + && __glibc_unlikely (abstime->tv_nsec >= 1000000000 + || abstime->tv_nsec < 0)) + return EINVAL; + /* Make sure we are not holding the rwlock as a writer. This is a deadlock situation we recognize and report. */ if (__glibc_unlikely (atomic_load_relaxed (&rwlock->__data.__cur_writer) diff --git a/nptl/pthread_rwlock_timedrdlock.c b/nptl/pthread_rwlock_timedrdlock.c index aa00530..84c1983 100644 --- a/nptl/pthread_rwlock_timedrdlock.c +++ b/nptl/pthread_rwlock_timedrdlock.c @@ -23,15 +23,5 @@ int pthread_rwlock_timedrdlock (pthread_rwlock_t *rwlock, const struct timespec *abstime) { - /* Make sure the passed in timeout value is valid. Note that the previous - implementation assumed that this check *must* not be performed if there - would in fact be no blocking; however, POSIX only requires that "the - validity of the abstime parameter need not be checked if the lock can be - immediately acquired" (i.e., we need not but may check it). */ - /* ??? Just move this to __pthread_rwlock_rdlock_full? */ - if (__glibc_unlikely (abstime->tv_nsec >= 1000000000 - || abstime->tv_nsec < 0)) - return EINVAL; - return __pthread_rwlock_rdlock_full (rwlock, abstime); } diff --git a/nptl/pthread_rwlock_timedwrlock.c b/nptl/pthread_rwlock_timedwrlock.c index 3c92e44..f0b745d 100644 --- a/nptl/pthread_rwlock_timedwrlock.c +++ b/nptl/pthread_rwlock_timedwrlock.c @@ -23,15 +23,5 @@ int pthread_rwlock_timedwrlock (pthread_rwlock_t *rwlock, const struct timespec *abstime) { - /* Make sure the passed in timeout value is valid. Note that the previous - implementation assumed that this check *must* not be performed if there - would in fact be no blocking; however, POSIX only requires that "the - validity of the abstime parameter need not be checked if the lock can be - immediately acquired" (i.e., we need not but may check it). */ - /* ??? Just move this to __pthread_rwlock_wrlock_full? */ - if (__glibc_unlikely (abstime->tv_nsec >= 1000000000 - || abstime->tv_nsec < 0)) - return EINVAL; - return __pthread_rwlock_wrlock_full (rwlock, abstime); }