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From: Andy Lutomirski <luto@amacapital.net>
To: Florian Weimer <fweimer@redhat.com>
Cc: Christian Brauner <christian@brauner.io>,
	ebiederm@xmission.com, linux-kernel@vger.kernel.org,
	serge@hallyn.com, jannh@google.com, luto@kernel.org,
	akpm@linux-foundation.org, oleg@redhat.com, cyphar@cyphar.com,
	viro@zeniv.linux.org.uk, linux-fsdevel@vger.kernel.org,
	linux-api@vger.kernel.org, dancol@google.com,
	timmurray@google.com, linux-man@vger.kernel.org,
	Kees Cook <keescook@chromium.org>
Subject: Re: [PATCH v2] signal: add procfd_signal() syscall
Date: Thu, 29 Nov 2018 08:54:18 -0800
Message-ID: <36323361-90BD-41AF-AB5B-EE0D7BA02C21@amacapital.net> (raw)
In-Reply-To: <87in0g5aqo.fsf@oldenburg.str.redhat.com>



> On Nov 29, 2018, at 4:28 AM, Florian Weimer <fweimer@redhat.com> wrote:
> 
> Disclaimer: I'm looking at this patch because Christian requested it.
> I'm not a kernel developer.
> 
> * Christian Brauner:
> 
>> diff --git a/arch/x86/entry/syscalls/syscall_32.tbl b/arch/x86/entry/syscalls/syscall_32.tbl
>> index 3cf7b533b3d1..3f27ffd8ae87 100644
>> --- a/arch/x86/entry/syscalls/syscall_32.tbl
>> +++ b/arch/x86/entry/syscalls/syscall_32.tbl
>> @@ -398,3 +398,4 @@
>> 384    i386    arch_prctl        sys_arch_prctl            __ia32_compat_sys_arch_prctl
>> 385    i386    io_pgetevents        sys_io_pgetevents        __ia32_compat_sys_io_pgetevents
>> 386    i386    rseq            sys_rseq            __ia32_sys_rseq
>> +387    i386    procfd_signal        sys_procfd_signal        __ia32_compat_sys_procfd_signal
>> diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
>> index f0b1709a5ffb..8a30cde82450 100644
>> --- a/arch/x86/entry/syscalls/syscall_64.tbl
>> +++ b/arch/x86/entry/syscalls/syscall_64.tbl
>> @@ -343,6 +343,7 @@
>> 332    common    statx            __x64_sys_statx
>> 333    common    io_pgetevents        __x64_sys_io_pgetevents
>> 334    common    rseq            __x64_sys_rseq
>> +335    64    procfd_signal        __x64_sys_procfd_signal
>> 
>> #
>> # x32-specific system call numbers start at 512 to avoid cache impact
>> @@ -386,3 +387,4 @@
>> 545    x32    execveat        __x32_compat_sys_execveat/ptregs
>> 546    x32    preadv2            __x32_compat_sys_preadv64v2
>> 547    x32    pwritev2        __x32_compat_sys_pwritev64v2
>> +548    x32    procfd_signal        __x32_compat_sys_procfd_signal
> 
> Is there a reason why these numbers have to be different?
> 
> (See the recent discussion with Andy Lutomirski.)

Hah, I missed this part of the patch.  Let’s not add new x32 syscall numbers.

Also, can we perhaps rework this a bit to get rid of the compat entry point?  The easier way would be to check in_compat_syscall(). The nicer way IMO would be to use the 64-bit structure for 32-bit as well.

  reply index

Thread overview: 54+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-11-20 10:51 Christian Brauner
2018-11-20 10:51 ` [PATCH v2] procfd_signal.2: document procfd_signal syscall Christian Brauner
2018-11-22  8:00 ` [PATCH v2] signal: add procfd_signal() syscall Serge E. Hallyn
2018-11-22  8:23 ` Aleksa Sarai
2018-11-28 14:05 ` Arnd Bergmann
2018-11-29 12:28 ` Florian Weimer
2018-11-29 16:54   ` Andy Lutomirski [this message]
2018-11-29 19:16     ` Christian Brauner
2018-11-29 19:22       ` Andy Lutomirski
2018-11-29 19:55         ` Christian Brauner
2018-11-29 20:14           ` Andy Lutomirski
2018-11-29 21:02             ` Arnd Bergmann
2018-11-29 21:35               ` Christian Brauner
2018-11-29 21:40                 ` Arnd Bergmann
2018-11-30  2:40                   ` Aleksa Sarai
2018-12-01  1:25                   ` Christian Brauner
2018-11-30  5:13               ` Eric W. Biederman
2018-11-30  6:56                 ` Christian Brauner
2018-11-30 11:41                   ` Arnd Bergmann
2018-11-30 16:35                     ` Andy Lutomirski
2018-11-30 21:57                       ` Christian Brauner
2018-11-30 22:09                       ` Arnd Bergmann
2018-11-30 22:26                         ` Christian Brauner
2018-11-30 23:05                           ` Daniel Colascione
2018-11-30 23:12                             ` Arnd Bergmann
2018-11-30 23:15                               ` Arnd Bergmann
2018-11-30 23:37                               ` Christian Brauner
2018-11-30 23:46                                 ` Andy Lutomirski
2018-12-01  1:20                                   ` Christian Brauner
2018-11-30 23:53                         ` Andy Lutomirski
2018-12-01  8:51                           ` Arnd Bergmann
2018-12-01  9:17                             ` Christian Brauner
2018-12-01 10:27                             ` Arnd Bergmann
2018-12-01 13:41                       ` Eric W. Biederman
2018-12-01 14:46                     ` Eric W. Biederman
2018-12-01 15:28                       ` Eric W. Biederman
2018-12-01 15:52                         ` Andy Lutomirski
2018-12-01 16:27                           ` Christian Brauner
2018-12-02  0:06                           ` Eric W. Biederman
2018-12-02  1:14                             ` Andy Lutomirski
2018-12-02  8:52                         ` Christian Brauner
2018-11-30 23:52   ` Christian Brauner
2018-12-02 10:03     ` Christian Brauner
2018-12-03 16:57       ` Florian Weimer
2018-12-03 18:02         ` Christian Brauner
2018-12-04  6:03           ` Aleksa Sarai
2018-12-04 12:55           ` Florian Weimer
2018-12-04 13:26             ` Christian Brauner
2018-12-06 18:54             ` Andy Lutomirski
2018-12-06 18:56               ` Florian Weimer
2018-12-06 19:03                 ` Christian Brauner
2018-12-25  5:32                   ` Lai Jiangshan
2018-12-25  7:11                     ` Lai Jiangshan
2018-12-25 12:07                       ` Aleksa Sarai

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