Date: Wed, 11 Nov 2015 14:32:31 +0100 From: Paolo Bonzini <pbonzini@...hat.com> To: kernel-hardening@...ts.openwall.com, Kees Cook <keescook@...omium.org> Cc: PaX Team <pageexec@...email.hu>, Brad Spengler <spender@...ecurity.net>, Greg KH <gregkh@...uxfoundation.org>, Theodore Tso <tytso@...gle.com>, Josh Triplett <josh@...htriplett.org> Subject: Re: Proposal for kernel self protection features On 07/11/2015 22:34, Emese Revfy wrote: >>> * gcc intentional overflow: gcc computes some expressions by overflow >>> when it optimizes. Sadly it is doing this in the front end where >>> there is no plugin support. Most of these false positives I handle >>> from the plugin or sometimes I patch the kernel source code. >>> There are some unsolved issues. >> >> Has there been any discussion with gcc folks about this problem? > > I never tried it. PaXTeam has some open tickets > (e.g., https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61311) for a long time so > because of it I haven't any courage. I'm not sure I still count as a gcc guy, having averaged at most 1 patch a year for some time now. However, I surely would like to know more about it, and perhaps can look into fixing some of the easier issues. Do open tickets and CC me (I'm bonzini@....org on the GCC tracker). Paolo
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