linux-kernel - Re: [PATCH v15 00/25] Compile-time stack metadata validation

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Message-ID: <20160112180456.GJ30558@pd.tnic>
Date:	Tue, 12 Jan 2016 19:04:56 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Josh Poimboeuf <jpoimboe@...hat.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, x86@...nel.org,
	linux-kernel@...r.kernel.org, live-patching@...r.kernel.org,
	Michal Marek <mmarek@...e.cz>,
	Peter Zijlstra <peterz@...radead.org>,
	Andy Lutomirski <luto@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andi Kleen <andi@...stfloor.org>,
	Pedro Alves <palves@...hat.com>,
	Namhyung Kim <namhyung@...il.com>,
	Bernd Petrovitsch <bernd@...rovitsch.priv.at>,
	Chris J Arges <chris.j.arges@...onical.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Slaby <jslaby@...e.cz>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	David Vrabel <david.vrabel@...rix.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Jeremy Fitzhardinge <jeremy@...p.org>,
	Chris Wright <chrisw@...s-sol.org>,
	Alok Kataria <akataria@...are.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	"David S. Miller" <davem@...emloft.net>,
	Mathias Krause <minipli@...linux.so>,
	Pavel Machek <pavel@....cz>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Len Brown <len.brown@...el.com>,
	Matt Fleming <matt@...eblueprint.co.uk>
Subject: Re: [PATCH v15 00/25] Compile-time stack metadata validation

On Tue, Jan 12, 2016 at 11:50:31AM -0600, Josh Poimboeuf wrote:
> Hm, that's kind of shocking.

I grepped like this

$ grep -c stacktool w.log

so that ~1000 is all lines with stacktool in them in the build log.

Here's the output again, this time sorted (offsets removed so that I can
aggregate the lines):

$ grep stacktool w.log | sed 's/+.*://' | sort | uniq -c | sort -n

	...

      2 stacktool: kernel/panic.o: nmi_panic_self_stop() function has unreachable instruction
      2 stacktool: kernel/sched/core.o: __schedule() frame pointer state mismatch
      3 stacktool: arch/x86/kernel/mcount_64.o: .entry.text return instruction outside of a callable function
      6 stacktool: arch/x86/entry/entry_64.o: .entry.text return instruction outside of a callable function
     10 stacktool: arch/x86/kvm/svm.o: svm_vcpu_run() call without frame pointer save/setup
     24 stacktool: arch/x86/crypto/camellia-aesni-avx2-asm_64.o: __camellia_dec_blk32() call without frame pointer save/setup
     24 stacktool: arch/x86/crypto/camellia-aesni-avx2-asm_64.o: __camellia_enc_blk32() call without frame pointer save/setup
     24 stacktool: arch/x86/crypto/camellia-aesni-avx-asm_64.o: __camellia_dec_blk16() call without frame pointer save/setup
     24 stacktool: arch/x86/crypto/camellia-aesni-avx-asm_64.o: __camellia_enc_blk16() call without frame pointer save/setup
   1089 stacktool: kernel/bpf/core.o: __bpf_prog_run() function has unreachable instruction

> Any chance you have CONFIG_GCOV_KERNEL enabled?

Nope.

> Otherwise, if you don't have gcov enabled, can you share your .config?

Attached.

-- 
Regards/Gruss,
    Boris.

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