Date: Thu, 30 Jun 2022 11:12:10 +0200 From: Solar Designer <solar@...nwall.com> To: Norbert Slusarek <nslusarek@....net> Cc: oss-security@...ts.openwall.com, peterz@...radead.org Subject: Re: CVE-2022-1729: race condition in Linux perf subsystem leads to local privilege escalation Hi all, I'm attaching Norbert's exploit (lpe.c) that was attached to his May 12 notification to linux-distros. We're now one month past the due date for Norbert's expected posting of this (should have been May 27, which is 7 days after public disclosure of the vulnerability on oss-security). Norbert, I would still appreciate a reply to the message below. I'm quoting it in full for context since it's been a month. Thanks, Alexander On Thu, May 26, 2022 at 07:35:46PM +0200, Solar Designer wrote: > > Thank you for engaging in this discussion. It helps. > > On Thu, May 26, 2022 at 06:44:38PM +0200, Norbert Slusarek wrote: > > >What do you suggest we do regarding the LPE exploit you sent to > > >linux-distros? > > > > I saw your reveal of linux-distros from 2020 and the exchange > > didn't include any text nor attachments. In that case, the > > exploit should remain private to linux-distros accordingly. > > I don't know what "reveal of linux-distros from 2020" you refer to. The > policy aspect in question (see below) is in effect since 2017, and I > don't recall us deviating from it. Did we? > > We have a published policy here: > > https://oss-security.openwall.org/wiki/mailing-lists/distros#list-policy-and-instructions-for-reporters > > which includes: > > "If you shared exploit(s) that are not an essential part of the issue > description, then at your option you may slightly delay posting them to > oss-security but you must post the exploits to oss-security within at > most 7 days of making the mandatory posting above. If you exercise this > option, you have two mandatory postings to make: first with a > sufficiently detailed issue description (as requested above) and with an > announcement of your intent to post the exploits separately (please > mention exactly when), and second with the exploits - or indeed you > could have included the exploits right away, in your first and only > mandatory posting." > > Did you read this before posting? If not, anything we should have done > to ensure you'd have read it? > > > >What do you suggest we do with this policy aspect going forward, so that > > >people do not get into a situation where they're required to do > > >something they didn't want to subscribe to? > > > > How is this policy aspect enforced in the first place? > > If it's not, I suggest you remove it entirely as there is no reason > > to have policies which cannot (and shouldn't) be enforced. > > Reminders, like I am doing now (often in private, this time in public). > Failing that, list members technically can post the exploits themselves. > Finally, we can setup the list to automatically make all messages public > with a delay. > > However, as you can see from another recent thread we're now in the > process of reconsidering list policy aspects, so might end up e.g. > extending the period from 7 to 30 days. Would that work for you? > > If people insist on keeping exploits sent to (linux-)distros private > forever, then I'll more likely either shut down the list instead or set > it up to automatically make all messages public. After all, if people > send private messages to some list without reading its published policy > first, they accept that anything can happen with those messages. Right? > Yet I've been reluctant to do that so far, as it's not ideal for social > and technical reasons. > > > Overall, as a researcher I would prefer having a way just to inform > > distros of a bug, *without* being subject to these requirements. > > I understand, yet I find that very problematic. > > Also, you don't need to post an exploit (especially more than a PoC) to > the list "to inform distros of a bug". You can literally just inform > them, and (if you don't accept the policy on forced publication of what > you share with the list) offer to privately share the exploit with > interested distros. Then the exploit itself wouldn't be subject to the > forced publication. > > Thanks again, > > Alexander View attachment "lpe.c" of type "text/x-c" (18326 bytes)
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