Date: Thu, 3 Nov 2022 20:28:10 -0400 From: Demi Marie Obenour <demi@...isiblethingslab.com> To: oss-security@...ts.openwall.com Cc: nic.tuv@...il.com, Hanno Böck <hanno@...too.org> Subject: Re: OpenSSL X.509 Email Address 4-byte Buffer Overflow (CVE-2022-3602), X.509 Email Address Variable Length Buffer Overflow (CVE-2022-3786) On Thu, Nov 03, 2022 at 08:23:32PM +0000, Sam James wrote: > > > > On 3 Nov 2022, at 16:32, Nicola Tuveri <nic.tuv@...il.com> wrote: > > > > I can also add that at least this member of the OpenSSL Technical > > Committee is following the discussion, and I believe I am not the only > > one. > > > > The feedback shared here on oss-security is read and carefully > > considered, and I know it will be discussed within OTC to continue the > > ongoing process of improving the OpenSSL project and its procedures. > > I'd like to thank the OpenSSL developers for being open to the > CI improvements I've been making lately. > > > > > I totally concur with Tavis Ormandy: > >> this is active prolific opensource security researchers discussing their opensource security work on the opensource security mailing list :) > > > > Personally, I'd like to thank you all for the feedback so far, as it > > is in itself a contribution to the project, even when it is harsh and > > reminds us of our mistakes. > > As long as it is kept polite and constructive, as it has been so far > > here, all feedback is very welcome and valuable. > > Something I think that should be revisited is the priority > of undefined behaviour in the codebase. > > Undefined behaviour can - and has  - led to misbehaviour > at runtime. > > Part of living with "Modern C" is embracing the > techniques we have available to enhance compiler diagnostics > and detect problems. That includes LTO, as well, which > generally leads to _far_ better compiler warnings. > > The OpenSSL codebase isn't strict aliasing clean, and in > Gentoo, we've built with -fno-strict-aliasing since ~2005 > (note that -fstrict-aliasing is enabled by default with -O2 > in GCC since at least 10 years ago). > > If at all possible, I'd ask that the OpenSSL team revisit > its assessment of the severity of strict aliasing bugs > as well as the value of LTO in enhancing diagnostics > and finding bugs. -fno-strict-aliasing is definitely the right call. I use it pretty much everywhere, as complying with the strict aliasing rules is often just not worth the effort. I suspect that wl_container_of (used in every C program using libwayland) may violate strict aliasing, and I am nearly certain X11 clients do. -- Sincerely, Demi Marie Obenour (she/her/hers) Invisible Things Lab Download attachment "signature.asc" of type "application/pgp-signature" (834 bytes)
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