From: Andy Lutomirski <luto@amacapital.net>
To: Alexey Brodkin <alexey.brodkin@synopsys.com>
Cc: LKML <linux-kernel@vger.kernel.org>,
linux-audit@redhat.com, Vineet Gupta <vineet.gupta1@synopsys.com>,
Eric Paris <eparis@redhat.com>,
"Dmitry V. Levin" <ldv@altlinux.org>,
arcml <linux-snps-arc@lists.infradead.org>,
Andrew Lutomirski <luto@kernel.org>,
Paul Moore <paul@paul-moore.com>,
Elvira Khabirova <lineprinter@altlinux.org>
Subject: Re: [PATCH 06/13] arc: define syscall_get_arch()
Date: Fri, 9 Nov 2018 08:35:21 -0800 [thread overview]
Message-ID: <CALCETrXCcBBTzcL_yz3agNhby1huZSn2UGtJ9Soo=8n8_rj1Tg@mail.gmail.com> (raw)
In-Reply-To: <215d66fd9a197b631973c9ff75943b4c1216b899.camel@synopsys.com>
On Fri, Nov 9, 2018 at 8:11 AM Alexey Brodkin
<alexey.brodkin@synopsys.com> wrote:
>
> Hi Andy,
>
> On Fri, 2018-11-09 at 07:56 -0800, Andy Lutomirski wrote:
> > > On Nov 9, 2018, at 7:27 AM, Alexey Brodkin <alexey.brodkin@synopsys.com> wrote:
> > >
> > > Hi Andy,
> > >
> > > > On Fri, 2018-11-09 at 07:17 -0800, Andy Lutomirski wrote:
> > > > On Fri, Nov 9, 2018 at 6:22 AM Alexey Brodkin
> > > > <alexey.brodkin@synopsys.com> wrote:
> > > > > Hi Dmitry,
> > > > >
> > > > > > On Fri, 2018-11-09 at 06:16 +0300, Dmitry V. Levin wrote:
> > > > > > syscall_get_arch() is required to be implemented on all architectures
> > > > > > that use tracehook_report_syscall_entry() in order to extend
> > > > > > the generic ptrace API with PTRACE_GET_SYSCALL_INFO request.
> > > > > >
> > > > > > Signed-off-by: Dmitry V. Levin <ldv@altlinux.org>
> > > > > > ---
> > > > > > arch/arc/include/asm/syscall.h | 6 ++++++
> > > > > > include/uapi/linux/audit.h | 1 +
> > > > > > 2 files changed, 7 insertions(+)
> > > > >
> > > > > [snip]
> > > > >
> > > > > > diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h
> > > > > > index 818ae690ab79..a7149ceb5b98 100644
> > > > > > --- a/include/uapi/linux/audit.h
> > > > > > +++ b/include/uapi/linux/audit.h
> > > > > > @@ -375,6 +375,7 @@ enum {
> > > > > >
> > > > > > #define AUDIT_ARCH_AARCH64 (EM_AARCH64|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
> > > > > > #define AUDIT_ARCH_ALPHA (EM_ALPHA|__AUDIT_ARCH_64BIT|__AUDIT_ARCH_LE)
> > > > > > +#define AUDIT_ARCH_ARC (EM_ARC)
> > > > >
> > > > > Similarly here we need to have:
> > > > > ---------------------------->8-----------------------------
> > > > > +#define AUDIT_ARCH_ARC (EM_ARC|EM_ARCV2)
> > > > > ---------------------------->8-----------------------------
> > > > >
> > > >
> > > > Huh? How does the bitwise or of two ELF machine codes make any sense?
> > >
> > > Oops... I didn't read examples of AUDIT_ARCH_ALPHA above :(
> > > Indeed that was stupid.
> > >
> > > But what would be a proper fix then?
> > >
> > > Something like that?
> > > ---------------------------->8-----------------------------
> > > #define AUDIT_ARCH_ARC (EM_ARC)
> > > #define AUDIT_ARCH_ARCV2 (EM_ARCV2)
> > >
> > >
> > > static inline int syscall_get_arch(void)
> > > {
> > > #ifdef __ARC700__
> > > return AUDIT_ARCH_ARC;
> > > #else
> > > return AUDIT_ARCH_ARCV2;
> > > #endif
> > > }
> > > ---------------------------->8-----------------------------
> > >
> >
> > Maybe, but I know basically nothing about ARC. Is the syscall numbering or calling convention different on ARC vs ARCv2?
>
> Syscall numbering should be the same as we use UAPI for both ARCompact (AKA ARCv1)
> and ARCv2. As for calling convention I think it indeed differs.
>
> Note ARCompact and ARCv2 ISAs are binary incompatible!
>
> Even though assembly look pretty much the same (sans instructions
> available only for either ARCompact or ARCv2) encodings are different so
> in that sense these are completely different architectures.
>
> Also I'm wondering what could be other cases for use of syscall_get_arch().
The intent of syscall_get_arch() is that the tuple:
(arch, nr, arg1, ..., arg6)
fully identifies a system call and its arguments. So it sounds like
we do indeed need to arch values.
>
> So I'd say it's better to report different values for ARC ISAs.
> And given we use the same values as in Binutils IMHO it would be good
> to not mix IDs here.
>
> -Alexey
--
Andy Lutomirski
AMA Capital Management, LLC
next prev parent reply other threads:[~2018-11-09 16:35 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-07 3:27 [RFC PATCH] ptrace: add PTRACE_GET_SYSCALL_INFO request Elvira Khabirova
2018-11-07 11:21 ` Oleg Nesterov
2018-11-07 14:06 ` Andy Lutomirski
2018-11-07 16:44 ` Oleg Nesterov
2018-11-07 20:02 ` Elvira Khabirova
2018-11-08 9:16 ` Oleg Nesterov
2018-11-07 20:20 ` Andy Lutomirski
2018-11-08 14:33 ` Oleg Nesterov
2018-11-07 16:12 ` Dmitry V. Levin
2018-11-07 15:50 ` Dmitry V. Levin
2018-11-07 20:44 ` Andy Lutomirski
2018-11-09 3:13 ` [PATCH 00/13] Prepare for PTRACE_GET_SYSCALL_INFO Dmitry V. Levin
2018-11-09 3:15 ` [PATCH 01/13] Move EM_HEXAGON to uapi/linux/elf-em.h Dmitry V. Levin
2018-11-09 3:15 ` [PATCH 02/13] elf-em.h: add EM_ARC Dmitry V. Levin
2018-11-09 14:20 ` Alexey Brodkin
2018-11-09 16:41 ` Vineet Gupta
2018-11-09 21:44 ` Dmitry V. Levin
2018-11-09 23:33 ` [PATCH 02/13 v2] Move EM_ARCOMPACT and EM_ARCV2 to uapi/linux/elf-em.h Dmitry V. Levin
2018-11-09 23:42 ` Vineet Gupta
2018-11-09 3:15 ` [PATCH 03/13] elf-em.h: add EM_NDS32 Dmitry V. Levin
2018-11-09 3:15 ` [PATCH 04/13] elf-em.h: add EM_XTENSA Dmitry V. Levin
2018-11-09 6:45 ` Max Filippov
2018-11-09 3:15 ` [PATCH 05/13] m68k: define syscall_get_arch() Dmitry V. Levin
2018-11-09 3:16 ` [PATCH 06/13] arc: " Dmitry V. Levin
2018-11-09 14:22 ` Alexey Brodkin
2018-11-09 15:17 ` Andy Lutomirski
2018-11-09 15:27 ` Alexey Brodkin
2018-11-09 15:56 ` Andy Lutomirski
2018-11-09 16:11 ` Alexey Brodkin
2018-11-09 16:35 ` Andy Lutomirski [this message]
2018-11-09 23:33 ` [PATCH 06/13 v2] " Dmitry V. Levin
2018-11-09 23:39 ` Vineet Gupta
2018-11-09 23:54 ` [PATCH 06/13 v3] " Dmitry V. Levin
2018-11-10 0:06 ` Vineet Gupta
2018-11-09 16:50 ` [PATCH 06/13] " Vineet Gupta
2018-11-09 19:03 ` Andy Lutomirski
2018-11-09 19:13 ` Vineet Gupta
2018-11-09 3:16 ` [PATCH 07/13] c6x: " Dmitry V. Levin
2018-11-10 2:01 ` [PATCH 07/13 v2] " Dmitry V. Levin
2018-11-09 3:16 ` [PATCH 08/13] h8300: " Dmitry V. Levin
2018-11-09 3:16 ` [PATCH 09/13] hexagon: " Dmitry V. Levin
2018-11-09 3:16 ` [PATCH 10/13] nds32: " Dmitry V. Levin
2018-11-10 2:01 ` [PATCH 10/13 v2] " Dmitry V. Levin
2018-11-09 3:17 ` [PATCH 11/13] nios2: " Dmitry V. Levin
2018-11-09 3:17 ` [PATCH 12/13] riscv: " Dmitry V. Levin
2018-11-09 6:59 ` David Abdurachmanov
2018-11-09 22:28 ` Dmitry V. Levin
2018-11-10 5:12 ` David Abdurachmanov
2018-11-10 9:27 ` Andreas Schwab
2018-11-09 18:45 ` Palmer Dabbelt
2018-11-09 21:31 ` Dmitry V. Levin
2018-11-09 22:48 ` [PATCH 12/13 v2] " Dmitry V. Levin
2018-11-11 21:21 ` Palmer Dabbelt
2018-11-09 3:17 ` [PATCH 13/13] xtensa: " Dmitry V. Levin
2018-11-09 6:48 ` Max Filippov
2018-11-09 6:06 ` [PATCH 00/13] Prepare for PTRACE_GET_SYSCALL_INFO Andy Lutomirski
2018-11-10 14:09 ` [PATCH 14/13] Move EM_UNICORE to uapi/linux/elf-em.h Dmitry V. Levin
2018-11-10 14:10 ` [PATCH 15/13] unicore32: define syscall_get_arch() Dmitry V. Levin
2018-11-13 3:38 ` [RFC PATCH] ptrace: add PTRACE_GET_SYSCALL_INFO request Dmitry V. Levin
2018-11-20 0:11 ` [PATCH v2 00/15] Prepare for PTRACE_GET_SYSCALL_INFO Dmitry V. Levin
2018-11-20 0:14 ` [PATCH v2 01/15] Move EM_HEXAGON to uapi/linux/elf-em.h Dmitry V. Levin
2018-11-20 0:14 ` [PATCH v2 02/15] Move EM_ARCOMPACT and EM_ARCV2 " Dmitry V. Levin
2018-11-20 0:14 ` [PATCH v2 03/15] Move EM_UNICORE " Dmitry V. Levin
2018-11-20 0:15 ` [PATCH v2 04/15] elf-em.h: add EM_NDS32 Dmitry V. Levin
2018-11-20 0:15 ` [PATCH v2 05/15] elf-em.h: add EM_XTENSA Dmitry V. Levin
2018-11-20 0:15 ` [PATCH v2 06/15] m68k: define syscall_get_arch() Dmitry V. Levin
2018-12-02 10:29 ` Geert Uytterhoeven
2018-12-03 0:24 ` Dmitry V. Levin
2018-12-03 7:36 ` Geert Uytterhoeven
2018-11-20 0:15 ` [PATCH v2 07/15] arc: " Dmitry V. Levin
2018-11-20 0:15 ` [PATCH v2 08/15] c6x: " Dmitry V. Levin
2018-11-20 0:16 ` [PATCH v2 09/15] h8300: " Dmitry V. Levin
2018-11-20 0:16 ` [PATCH v2 10/15] hexagon: " Dmitry V. Levin
2018-11-20 0:16 ` [PATCH v2 11/15] nds32: " Dmitry V. Levin
2018-11-20 0:16 ` [PATCH v2 12/15] nios2: " Dmitry V. Levin
2018-11-20 0:16 ` [PATCH v2 13/15] riscv: " Dmitry V. Levin
2018-11-20 0:16 ` [PATCH v2 14/15] unicore32: " Dmitry V. Levin
2018-11-20 0:17 ` [PATCH v2 15/15] xtensa: " Dmitry V. Levin
2018-11-20 20:26 ` [PATCH v2 00/15] Prepare for PTRACE_GET_SYSCALL_INFO Paul Moore
[not found] ` <20181121004422.GA29053@altlinux.org>
[not found] ` <20181121184004.jro532jopnbmru2m@pburton-laptop>
2018-11-21 19:00 ` [PATCH v2 16/15] syscall_get_arch: add "struct task_struct *" argument Dmitry V. Levin
2018-11-21 19:14 ` [PATCH] mips: fix mips_get_syscall_arg o32 check Dmitry V. Levin
2018-11-21 19:23 ` Paul Burton
2018-11-21 19:35 ` [PATCH v2 16/15 v2] syscall_get_arch: add "struct task_struct *" argument Dmitry V. Levin
2018-11-21 19:45 ` Paul Burton
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to='CALCETrXCcBBTzcL_yz3agNhby1huZSn2UGtJ9Soo=8n8_rj1Tg@mail.gmail.com' \
--to=luto@amacapital.net \
--cc=alexey.brodkin@synopsys.com \
--cc=eparis@redhat.com \
--cc=ldv@altlinux.org \
--cc=lineprinter@altlinux.org \
--cc=linux-audit@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-snps-arc@lists.infradead.org \
--cc=luto@kernel.org \
--cc=paul@paul-moore.com \
--cc=vineet.gupta1@synopsys.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).