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Re: [PATCH v2 3/8] objtool: stack validation 2.0

From Ingo Molnar <mingo@kernel.org>
Newsgroups linux.kernel
Subject Re: [PATCH v2 3/8] objtool: stack validation 2.0
Date 2017-06-30 10:40 +0200
Message-ID <tXZD4-36F-7@gated-at.bofh.it> (permalink)
References <tXmV4-8uj-15@gated-at.bofh.it> <tXmV4-8uj-13@gated-at.bofh.it>
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* Josh Poimboeuf <jpoimboe@redhat.com> wrote:

> This is a major rewrite of objtool.  Instead of only tracking frame
> pointer changes, it now tracks all stack-related operations, including
> all register saves/restores.
> 
> In addition to making stack validation more robust, this also paves the
> way for undwarf generation.
> 
> Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>

Note, I have applied the first 3 patches, and got a bunch of new warnings on x86 
64-bit allmodconfig:

 arch/x86/kernel/alternative.o: warning: objtool: do_sync_core()+0x1b: unsupported instruction in callable function
 arch/x86/kernel/alternative.o: warning: objtool: text_poke()+0x1a8: unsupported instruction in callable function
 arch/x86/kernel/ftrace.o: warning: objtool: do_sync_core()+0x16: unsupported instruction in callable function
 arch/x86/kernel/cpu/mcheck/mce.o: warning: objtool: machine_check_poll()+0x166: unsupported instruction in callable function
 arch/x86/kernel/cpu/mcheck/mce.o: warning: objtool: do_machine_check()+0x147: unsupported instruction in callable function

(That's the vmlinux build - plus 4 more warnings in the modules build.)

That's with GCC 5.3.1.

Let me know if you need any more info.

Thanks,

	Ingo

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Thread

[PATCH v2 0/8] x86: undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-28 17:20 +0200
  [PATCH v2 4/8] objtool: add undwarf debuginfo generation Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-28 17:20 +0200
    Re: [PATCH v2 4/8] objtool: add undwarf debuginfo generation Ingo Molnar <mingo@kernel.org> - 2017-06-29 09:20 +0200
      Re: [PATCH v2 4/8] objtool: add undwarf debuginfo generation Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-29 15:50 +0200
    Re: [PATCH v2 4/8] objtool: add undwarf debuginfo generation Ingo Molnar <mingo@kernel.org> - 2017-06-29 09:30 +0200
      Re: [PATCH v2 4/8] objtool: add undwarf debuginfo generation Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-29 16:10 +0200
        Re: [PATCH v2 4/8] objtool: add undwarf debuginfo generation Ingo Molnar <mingo@kernel.org> - 2017-06-29 16:50 +0200
          Re: [PATCH v2 4/8] objtool: add undwarf debuginfo generation Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-29 17:10 +0200
  [PATCH v2 7/8] x86/asm: add unwind hint annotations to sync_core() Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-28 17:20 +0200
  [PATCH v2 2/8] objtool, x86: add several functions and files to the objtool whitelist Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-28 17:20 +0200
    [tip:core/objtool] objtool, x86: Add several functions and files to  the objtool whitelist tip-bot for Josh Poimboeuf <tipbot@zytor.com> - 2017-06-30 15:20 +0200
  [PATCH v2 6/8] x86/entry: add unwind hint annotations Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-28 17:20 +0200
    Re: [PATCH v2 6/8] x86/entry: add unwind hint annotations Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-29 20:00 +0200
      Re: [PATCH v2 6/8] x86/entry: add unwind hint annotations Andy Lutomirski <luto@kernel.org> - 2017-06-29 21:00 +0200
        Re: [PATCH v2 6/8] x86/entry: add unwind hint annotations Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-29 21:10 +0200
          Re: [PATCH v2 6/8] x86/entry: add unwind hint annotations Andy Lutomirski <luto@kernel.org> - 2017-06-29 23:20 +0200
            Re: [PATCH v2 6/8] x86/entry: add unwind hint annotations Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-29 23:50 +0200
              Re: [PATCH v2 6/8] x86/entry: add unwind hint annotations Andy Lutomirski <luto@amacapital.net> - 2017-06-30 01:00 +0200
                Re: [PATCH v2 6/8] x86/entry: add unwind hint annotations Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-30 04:20 +0200
                Re: [PATCH v2 6/8] x86/entry: add unwind hint annotations Andy Lutomirski <luto@kernel.org> - 2017-06-30 07:10 +0200
                Re: [PATCH v2 6/8] x86/entry: add unwind hint annotations Andy Lutomirski <luto@kernel.org> - 2017-06-30 07:50 +0200
                Re: [PATCH v2 6/8] x86/entry: add unwind hint annotations Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-30 15:20 +0200
                Re: [PATCH v2 6/8] x86/entry: add unwind hint annotations Andy Lutomirski <luto@kernel.org> - 2017-06-30 17:50 +0200
                Re: [PATCH v2 6/8] x86/entry: add unwind hint annotations Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-30 18:00 +0200
                Re: [PATCH v2 6/8] x86/entry: add unwind hint annotations Andy Lutomirski <luto@kernel.org> - 2017-06-30 18:00 +0200
                Re: [PATCH v2 6/8] x86/entry: add unwind hint annotations Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-30 18:20 +0200
  [PATCH v2 1/8] objtool: move checking code to check.c Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-28 17:20 +0200
  Re: [PATCH v2 0/8] x86: undwarf unwinder Ingo Molnar <mingo@kernel.org> - 2017-06-29 10:00 +0200
    Re: [PATCH v2 0/8] x86: undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-29 16:20 +0200
      Re: [PATCH v2 0/8] x86: undwarf unwinder Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-29 21:20 +0200
  Re: [PATCH v2 3/8] objtool: stack validation 2.0 Ingo Molnar <mingo@kernel.org> - 2017-06-30 10:40 +0200
    Re: [PATCH v2 3/8] objtool: stack validation 2.0 Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-30 15:30 +0200
      Re: [PATCH v2 3/8] objtool: stack validation 2.0 Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-30 15:30 +0200
    [PATCH] objtool: silence warnings for functions which use iret Josh Poimboeuf <jpoimboe@redhat.com> - 2017-06-30 16:10 +0200
      [tip:core/objtool] objtool: Silence warnings for functions which  use IRET tip-bot for Josh Poimboeuf <tipbot@zytor.com> - 2017-06-30 20:00 +0200

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