Date: Tue, 15 Nov 2016 17:01:37 +0000 From: bugzilla-noreply@freebsd.org To: freebsd-threads@FreeBSD.org Subject: [Bug 214540] pam_exec isn't multithreading save Message-ID: <bug-214540-16@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214540 Bug ID: 214540 Summary: pam_exec isn't multithreading save Product: Base System Version: 11.0-RELEASE Hardware: Any OS: Any Status: New Severity: Affects Some People Priority: --- Component: threads Assignee: freebsd-threads@FreeBSD.org Reporter: crest@bultmann.eu The pam_exec module uses vfork()+execve() and waitpid() to spawn a child process and wait for its completion. This is a race condition in a multithreaded process using PAM. An other thread could reap the process forked by pam_exec in which case waitpid() would either fail because there is no valid pid to wait for or wait for the wrong process if it happens to reuse the pid. The correct solution would be to use pdfork() and wait with kevent() on the (EVFILT_PROCDESC, process descriptor) event. -- You are receiving this mail because: You are the assignee for the bug.home | help
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