From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris J Arges Subject: Re: [PATCH 00/33] Compile-time stack metadata validation Date: Fri, 22 Jan 2016 14:40:35 -0600 Message-ID: <20160122204034.GA5826@canonical.com> References: <20160122174348.GB29221@canonical.com> <20160122191447.GH20502@treble.redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Thomas Gleixner , Ingo Molnar , "H. Peter Anvin" , x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, live-patching-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, Michal Marek , Peter Zijlstra , Andy Lutomirski , Borislav Petkov , Linus Torvalds , Andi Kleen , Pedro Alves , Namhyung Kim , Bernd Petrovitsch , Andrew Morton , Jiri Slaby , Arnaldo Carvalho de Melo , David Vrabel , Borislav Petkov , Konrad Rzeszutek Wilk , Boris Ostrovsky , Jeremy Fitzhardinge , Chris Wright , Alok To: Josh Poimboeuf Return-path: Content-Disposition: inline In-Reply-To: <20160122191447.GH20502-8wJ5/zUtDR0XGNroddHbYwC/G2K4zDHf@public.gmane.org> Sender: linux-watchdog-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: netdev.vger.kernel.org On Fri, Jan 22, 2016 at 01:14:47PM -0600, Josh Poimboeuf wrote: > On Fri, Jan 22, 2016 at 11:43:48AM -0600, Chris J Arges wrote: > > On Thu, Jan 21, 2016 at 04:49:04PM -0600, Josh Poimboeuf wrote: > > > This is v16 of the compile-time stack metadata validation patch set, > > > along with proposed fixes for most of the warnings it found. It's based > > > on the tip/master branch. > > > > > Josh, > > > > Looks good, with my config [1] I do still get a few warnings building > > linux/linux-next. > > > > Here are the warnings: > > $ grep ^stacktool build.log | grep -v staging > > Thanks for reporting these! > > > stacktool: arch/x86/kvm/vmx.o: vmx_handle_external_intr()+0x67: call without frame pointer save/setup > > This can be fixed by setting the stack pointer as an output operand for > the inline asm call in vmx_handle_external_intr(). > > Feel free to submit a patch, or I'll get around to it eventually. > > > stacktool: fs/reiserfs/namei.o: set_de_name_and_namelen()+0x9e: return without frame pointer restore > > stacktool: fs/reiserfs/namei.o: set_de_name_and_namelen()+0x89: duplicate frame pointer save > > stacktool: fs/reiserfs/namei.o: set_de_name_and_namelen()+0x8a: duplicate frame pointer setup > > stacktool: fs/reiserfs/namei.o: set_de_name_and_namelen()+0x9e: frame pointer state mismatch > > stacktool: fs/reiserfs/namei.o: set_de_name_and_namelen()+0x0: frame pointer state mismatch > > These are false positives. Stacktool is confused by the use of a > "noreturn" function which it doesn't know about (__reiserfs_panic). > > Unfortunately the only solution I currently have for dealing with global > noreturn functions is to just hard-code a list of them. So the short > term fix would be to add "__reiserfs_panic" to the global_noreturns list > in tools/stacktool/builtin-check.c. > > I'm still trying to figure out a better way to deal with this type of > issue, as it's a pain to have to keep a hard-coded list of noreturn > functions. Unfortunately that info isn't available in the ELF. > Josh, Ok I'll hack on the patches above. > > stacktool: fs/reiserfs/ibalance.o: .text: unexpected end of section > > stacktool: fs/reiserfs/tail_conversion.o: .text: unexpected end of section > > For some reason I'm not able to recreate these warnings... Can you > share one of the .o files? > > -- > Josh > Binaries are here: http://people.canonical.com/~arges/stacktool/ --chris -- To unsubscribe from this list: send the line "unsubscribe linux-watchdog" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html