From: "Dmitry V. Levin" <ldv@altlinux.org>
To: Oleg Nesterov <oleg@redhat.com>
Cc: Eugene Syromyatnikov <esyr@redhat.com>,
linux-kernel@vger.kernel.org,
Elvira Khabirova <lineprinter@altlinux.org>,
Paul Mackerras <paulus@samba.org>,
Andy Lutomirski <luto@kernel.org>,
Breno Leitao <leitao@debian.org>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH v4] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call
Date: Fri, 7 Dec 2018 21:42:46 +0300 [thread overview]
Message-ID: <20181207184246.GA31278@altlinux.org> (raw)
In-Reply-To: <20181207163410.GA19110@redhat.com>
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On Fri, Dec 07, 2018 at 05:34:10PM +0100, Oleg Nesterov wrote:
> On 12/07, Dmitry V. Levin wrote:
> > On Fri, Dec 07, 2018 at 10:12:49PM +1100, Michael Ellerman wrote:
> >
> > > > Sorry, this patch does not work, please ignore it.
> > >
> > > Hmm OK. Why exactly?
> >
> > Unfortunately, I have no idea why it doesn't work.
> > All I can say is it breaks strace because the kernel no longer sends
> > syscall entry stops.
>
> May be because TIF_SYSCALL_EMU/etc is a bit number, not a mask? IOW, rather
> than
>
> whatever & TIF_XXX
>
> you should do
>
> whatever & _TIF_XXX
>
> intstead?
Thanks Oleg, this was exactly the reason why it didn't work.
That kind of things happens when you let userspace people hack you kernel. :)
--
ldv
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prev parent reply other threads:[~2018-12-07 18:45 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-16 11:17 [PATCH v2] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call Elvira Khabirova
2018-11-16 12:42 ` Michael Ellerman
2018-11-19 21:01 ` [PATCH v3] " Dmitry V. Levin
2018-11-21 21:17 ` Michael Ellerman
2018-12-03 3:18 ` [PATCH v4] " Dmitry V. Levin
2018-12-07 1:19 ` Dmitry V. Levin
2018-12-07 11:12 ` Michael Ellerman
2018-12-07 15:42 ` Dmitry V. Levin
2018-12-07 15:56 ` [PATCH v5] " Dmitry V. Levin
2018-12-07 18:52 ` [PATCH v6] " Dmitry V. Levin
2018-12-10 13:28 ` Oleg Nesterov
2018-12-10 13:36 ` Dmitry V. Levin
2018-12-16 17:28 ` [PATCH] powerpc/ptrace: cleanup do_syscall_trace_enter Dmitry V. Levin
2018-12-17 11:20 ` Michael Ellerman
2018-12-17 11:23 ` Dmitry V. Levin
2018-12-17 11:27 ` Oleg Nesterov
2018-12-22 9:54 ` Michael Ellerman
2018-12-11 13:45 ` [v5] powerpc/ptrace: replace ptrace_report_syscall() with a tracehook call Michael Ellerman
2018-12-07 16:34 ` [PATCH v4] " Oleg Nesterov
2018-12-07 18:42 ` Dmitry V. Levin [this message]
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