linux-kernel - Re: [PATCH 03/13] x86/paravirt: Convert native patch assembly code strings to macros

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20171117194231.576qqr3wnkgowdln@treble>
Date:   Fri, 17 Nov 2017 13:42:31 -0600
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Juergen Gross <jgross@...e.com>
Cc:     Borislav Petkov <bp@...en8.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org, Andy Lutomirski <luto@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Sasha Levin <alexander.levin@...izon.com>,
        live-patching@...r.kernel.org, Jiri Slaby <jslaby@...e.cz>,
        Ingo Molnar <mingo@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Mike Galbraith <efault@....de>,
        Chris Wright <chrisw@...s-sol.org>,
        Alok Kataria <akataria@...are.com>,
        Rusty Russell <rusty@...tcorp.com.au>,
        virtualization@...ts.linux-foundation.org,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        xen-devel@...ts.xenproject.org,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 03/13] x86/paravirt: Convert native patch assembly code
 strings to macros

On Fri, Nov 17, 2017 at 08:10:13PM +0100, Juergen Gross wrote:
> On 17/11/17 19:07, Borislav Petkov wrote:
> > On Wed, Oct 04, 2017 at 10:58:24AM -0500, Josh Poimboeuf wrote:
> >> Convert the hard-coded native patch assembly code strings to macros to
> >> facilitate sharing common code between 32-bit and 64-bit.
> >>
> >> These macros will also be used by a future patch which requires the GCC
> >> extended asm syntax of two '%' characters instead of one when specifying
> >> a register name.
> >>
> >> Signed-off-by: Josh Poimboeuf <jpoimboe@...hat.com>
> >> ---
> >>  arch/x86/include/asm/special_insns.h | 24 ++++++++++++++++++++++++
> >>  arch/x86/kernel/paravirt_patch_32.c  | 21 +++++++++++----------
> >>  arch/x86/kernel/paravirt_patch_64.c  | 29 +++++++++++++++--------------
> >>  3 files changed, 50 insertions(+), 24 deletions(-)
> >>
> >> diff --git a/arch/x86/include/asm/special_insns.h b/arch/x86/include/asm/special_insns.h
> >> index ac402c6fc24b..0549c5f2c1b3 100644
> >> --- a/arch/x86/include/asm/special_insns.h
> >> +++ b/arch/x86/include/asm/special_insns.h
> >> @@ -6,6 +6,30 @@
> >>  
> >>  #include <asm/nops.h>
> >>  
> >> +#ifdef CONFIG_X86_64
> >> +# define _REG_ARG1			"%rdi"
> >> +# define NATIVE_IDENTITY_32		"mov %edi, %eax"
> > 
> > Yeah, that "identity" looks strange. How about NATIVE_NOOP and
> > NATIVE_NOOP_32 ?
> 
> Those are not NOPs. They return the identical value which was passed to
> them. So identity isn't a bad name after all.

Right, like the math identity function:

  https://en.wikipedia.org/wiki/Identity_function

> >> +# define NATIVE_USERGS_SYSRET64		"swapgs; sysretq"
> >> +#else
> >> +# define _REG_ARG1			"%eax"
> >> +#endif
> >> +
> >> +#define _REG_RET			"%" _ASM_AX
> >> +
> >> +#define NATIVE_ZERO			"xor " _REG_ARG1 ", " _REG_ARG1
> > 
> > NATIVE_ZERO_OUT
> > 
> > I guess. NATIVE_ZERO reads like the native representation of 0 :-)
> 
> NATIVE_ZERO_ARG1?

On a slight tangent, does anybody know why it zeros the arg?

The only place it's used is here:

#if defined(CONFIG_PARAVIRT_SPINLOCKS)
DEF_NATIVE(pv_lock_ops,	queued_spin_unlock,	NATIVE_QUEUED_SPIN_UNLOCK);
DEF_NATIVE(pv_lock_ops,	vcpu_is_preempted,	NATIVE_ZERO);
#endif

Isn't that a bug?  Seems like it should _return_ zero.  Zeroing the arg
shouldn't have any effect.

If I'm right, we could call it NATIVE_FALSE.

-- 
Josh