Date: Fri, 19 Jul 2019 00:46:28 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Brooks Davis <brooks@freebsd.org> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r350116 - head/lib/libc/gen Message-ID: <20190718214628.GD47193@kib.kiev.ua> In-Reply-To: <20190718214115.GA42117@spindle.one-eyed-alien.net> References: <201907182133.x6ILXu4k026793@repo.freebsd.org> <20190718214115.GA42117@spindle.one-eyed-alien.net>
next in thread | previous in thread | raw e-mail | index | archive | help
On Thu, Jul 18, 2019 at 09:41:15PM +0000, Brooks Davis wrote: > On Thu, Jul 18, 2019 at 09:33:56PM +0000, Brooks Davis wrote: > > Author: brooks > > Date: Thu Jul 18 21:33:55 2019 > > New Revision: 350116 > > URL: https://svnweb.freebsd.org/changeset/base/350116 > > > > Log: > > Document that setmode(3) is not thread safe. > > > > In some circumstances, setmode(3) may call umask(2) twice to retrieve > > the current mode and then restore it. Between calls, the process will > > have a umask of 0. > > This race isn't especially serious, since it only occurs when > security.bsd.unprivileged_proc_debug=0, but it's probably something to > fix. The easiest solution would probably be to implement a getumask() > syscall. You can use pthread_suspend_all_np(3).
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20190718214628.GD47193>