Bug 496973 - Crond leaks its inotify file descriptor
Crond leaks its inotify file descriptor
Product: Fedora
Classification: Fedora
Component: cronie (Show other bugs)
All Linux
low Severity medium
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Assigned To: Marcela Mašláňová
Fedora Extras Quality Assurance
Depends On:
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Reported: 2009-04-21 17:20 EDT by Eric Paris
Modified: 2009-04-23 05:30 EDT (History)
4 users (show)

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Doc Type: Bug Fix
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Last Closed: 2009-04-23 05:30:44 EDT
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Description Eric Paris 2009-04-21 17:20:01 EDT
src/cron.c::main() has this call to set up the inotify file descriptor

        database.ifd = fd = inotify_init();
        if (fd < 0)
                log_it("CRON", pid, "INFO", "Inotify init failed", errno);

But this means that fd is going to be leaked to it's children on exec.  SELinux spotted denials that are almost certainly because of this leaked file descriptor across execve.

I suggest using

databse.ifd = fd = inotify_init1(IN_CLOEXEC)

instead of just inotify_init()
Comment 1 Marcela Mašláňová 2009-04-23 05:30:44 EDT
Thanks for report.

It's better to use fcntl here, because inotify_init1 is used since kernel-2.6.27 and cronie should be used also with older kernels.

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