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Differential D41381

syslogd: Pre-open null file descriptor
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Authored by jfree on Aug 8 2023, 4:36 PM.

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markj
emaste

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rG7428ebfe7e25: syslogd: Pre-open null file descriptor

Summary

Open _PATH_DEVNULL before entering capability mode. Access to /dev/null
is needed for dup2() when piping commands.

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rG FreeBSD src repository

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Event Timeline

jfree created this revision.Aug 8 2023, 4:36 PM

Herald added a subscriber: imp. · View Herald TranscriptAug 8 2023, 4:36 PM

jfree requested review of this revision.Aug 8 2023, 4:36 PM

jfree added a parent revision: D41380: syslogd: Do not open console descriptor.

markj accepted this revision.Aug 11 2023, 3:06 PM

markj added inline comments.

usr.sbin/syslogd/syslogd.c
843	I think you could reasonably abort the process if /dev/null isn't accessible. Then you don't need those `nulldesc >= 0` checks.
3581–3582	There is a pre-existing buglet here in that pfd[0] and [1] are not closed if pdfork() fails.

This revision is now accepted and ready to land.Aug 11 2023, 3:06 PM

Update after rebase and address Mark's comments

This revision now requires review to proceed.Aug 12 2023, 3:50 AM

Remove some rebasing errors (consfile got declared twice)

jfree added a child revision: D41433: syslogd: Ignore signals in sigcatch[].Aug 12 2023, 4:03 AM

markj accepted this revision.Aug 14 2023, 2:26 PM

This revision is now accepted and ready to land.Aug 14 2023, 2:26 PM

The nulldesc descriptor is used in waitdaemon() so open it prior to calling waitdaemon()

This revision now requires review to proceed.Aug 14 2023, 5:52 PM

Update after peerlist rebase, adding pidfile_remove()

markj accepted this revision.Aug 23 2023, 2:39 PM

This revision is now accepted and ready to land.Aug 23 2023, 2:39 PM

Closed by commit rG7428ebfe7e25: syslogd: Pre-open null file descriptor (authored by jfree, committed by markj). · Explain WhySep 28 2023, 3:54 PM

This revision was automatically updated to reflect the committed changes.

markj added a commit: rG7428ebfe7e25: syslogd: Pre-open null file descriptor.

Revision Contents
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Path

Size

usr.sbin/

syslogd/

24 lines

Diff 125987

usr.sbin/syslogd/syslogd.c

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