From: Michael Ellerman <mpe@ellerman.id.au>
To: Kees Cook <keescook@chromium.org>, Thomas Gleixner <tglx@linutronix.de>
Cc: Robert O'Callahan <rocallahan@gmail.com>,
LKML <linux-kernel@vger.kernel.org>,
"maintainer\:X86 ARCHITECTURE \(32-BIT AND 64-BIT\)"
<x86@kernel.org>,
linux-arch@vger.kernel.org, Will Deacon <will@kernel.org>,
Arnd Bergmann <arnd@arndb.de>,
Mark Rutland <mark.rutland@arm.com>,
Keno Fischer <keno@juliacomputing.com>,
Paolo Bonzini <pbonzini@redhat.com>,
kvm list <kvm@vger.kernel.org>,
Gabriel Krisman Bertazi <krisman@collabora.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Kyle Huey <me@kylehuey.com>
Subject: Re: [REGRESSION] x86/entry: Tracer no longer has opportunity to change the syscall number at entry via orig_ax
Date: Thu, 17 Sep 2020 10:39:40 +1000 [thread overview]
Message-ID: <875z8dp777.fsf@mpe.ellerman.id.au> (raw)
In-Reply-To: <202009141303.08B39E5783@keescook>
Kees Cook <keescook@chromium.org> writes:
> On Sun, Sep 13, 2020 at 08:27:23PM +0200, Thomas Gleixner wrote:
>> On Sun, Sep 13 2020 at 17:44, Michael Ellerman wrote:
>> > Kees Cook <keescook@chromium.org> writes:
>> > diff --git a/kernel/entry/common.c b/kernel/entry/common.c
>> > index 18683598edbc..901361e2f8ea 100644
>> > --- a/kernel/entry/common.c
>> > +++ b/kernel/entry/common.c
>> > @@ -60,13 +60,15 @@ static long syscall_trace_enter(struct pt_regs *regs, long syscall,
>> > return ret;
>> > }
>> >
>> > + syscall = syscall_get_nr(current, regs);
>> > +
>> > if (unlikely(ti_work & _TIF_SYSCALL_TRACEPOINT))
>> > trace_sys_enter(regs, syscall);
>> >
>> > syscall_enter_audit(regs, syscall);
>> >
>> > /* The above might have changed the syscall number */
>> > - return ret ? : syscall_get_nr(current, regs);
>> > + return ret ? : syscall;
>> > }
>>
>> Yup, this looks right. Can you please send a proper patch?
>
> I already did on Friday:
> https://lore.kernel.org/lkml/20200912005826.586171-1-keescook@chromium.org/
Thanks.
cheers
prev parent reply other threads:[~2020-09-17 0:48 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-19 17:14 [REGRESSION] x86/entry: Tracer no longer has opportunity to change the syscall number at entry via orig_ax Kyle Huey
2020-08-19 19:44 ` Thomas Gleixner
2020-08-20 17:26 ` Kyle Huey
2020-08-20 21:09 ` Kees Cook
2020-08-21 0:35 ` Thomas Gleixner
[not found] ` <87a6xzrr89.fsf@mpe.ellerman.id.au>
2020-09-11 18:58 ` Kees Cook
2020-09-12 0:10 ` Kees Cook
2020-09-13 7:44 ` Michael Ellerman
2020-09-13 18:27 ` Thomas Gleixner
2020-09-14 20:04 ` Kees Cook
2020-09-17 0:39 ` Michael Ellerman [this message]
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