Date: Mon, 16 Apr 2018 20:45:21 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r332633 - in stable: 10/lib/libthr/thread 11/lib/libthr/thread Message-ID: <201804162045.w3GKjLom036576@repo.freebsd.org>
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Author: jhb Date: Mon Apr 16 20:45:21 2018 New Revision: 332633 URL: https://svnweb.freebsd.org/changeset/base/332633 Log: MFC 331324: Ensure thread library is initialized in pthread_testcancel(). Call _thr_check_init() before reading curthread in pthread_testcancel(). If a constructor in a library creates a semaphore via sem_init() and then waits for it via sem_wait(), the program can core dump in _pthread_testcancel() called from sem_wait(). This is because the semaphore implementation lives in libc, so the library's constructors can be run before libthr's constructors. Sponsored by: DARPA / AFRL Modified: stable/11/lib/libthr/thread/thr_cancel.c Directory Properties: stable/11/ (props changed) Changes in other areas also in this revision: Modified: stable/10/lib/libthr/thread/thr_cancel.c Directory Properties: stable/10/ (props changed) Modified: stable/11/lib/libthr/thread/thr_cancel.c ============================================================================== --- stable/11/lib/libthr/thread/thr_cancel.c Mon Apr 16 19:33:04 2018 (r332632) +++ stable/11/lib/libthr/thread/thr_cancel.c Mon Apr 16 20:45:21 2018 (r332633) @@ -130,8 +130,10 @@ _pthread_setcanceltype(int type, int *oldtype) void _pthread_testcancel(void) { - struct pthread *curthread = _get_curthread(); + struct pthread *curthread; + _thr_check_init(); + curthread = _get_curthread(); testcancel(curthread); }
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