Date: Mon, 12 Jun 2017 20:15:06 +0200 From: Casper.Dik@...cle.com To: oss-security@...ts.openwall.com Subject: Re: Vixie/ISC Cron group crontab to root escalation >On Jun 9, 6:27pm, solar@...nwall.com (Solar Designer) wrote: >-- Subject: Re: [oss-security] Vixie/ISC Cron group crontab to root escalatio > >| Oh, I did in fact mention this in the private discussion, so I'll quote: >| >| | Another detail: somehow in Owl we introduced lstat() prior to open, and >| | check lstat()'s struct for all the required properties before proceeding >| | with open() with O_NOFOLLOW. Then we check that st_dev/st_ino stayed >| | the same. We also kept the post-open() checks. I don't recall exactly >| | why we added this, but maybe because of the possibility of side-effects >| | on open() for hard links to device files (like with tape drives). And >| | it looks like we neglected to add the same for at jobs (perhaps didn't >| | revisit this when support for at jobs appeared via our update to later >| | OpenBSD code) - maybe we should. > >Thanks, perhaps a comment in the code can't hurt... >Or even O_NODEV which does not exist, or O_PATH (linux only).. As there is a O_DIRECTORY it would be more orthogonal to have O_REGULAR (open only a regular file). But that becomes more and more icky as we're running out of 32 bits of O_*) Casper
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