From: Christian Brauner <christian@brauner.io>
To: kbuild test robot <lkp@intel.com>
Cc: kbuild-all@01.org, 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 v1 2/2] signal: add procfd_signal() syscall
Date: Tue, 20 Nov 2018 00:45:18 +0100 [thread overview]
Message-ID: <20181119234515.o5dg5s2wtu6wl6m3@brauner.io> (raw)
In-Reply-To: <201811200755.avfmktKQ%fengguang.wu@intel.com>
On Tue, Nov 20, 2018 at 07:37:58AM +0800, kbuild test robot wrote:
> Hi Christian,
>
> Thank you for the patch! Yet something to improve:
>
> [auto build test ERROR on linus/master]
> [also build test ERROR on v4.20-rc3]
> [cannot apply to next-20181119]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>
> url: https://github.com/0day-ci/linux/commits/Christian-Brauner/proc-allow-signaling-processes-via-file-descriptors/20181120-063836
> config: riscv-tinyconfig (attached as .config)
> compiler: riscv64-linux-gcc (GCC) 8.1.0
> reproduce:
> wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
> chmod +x ~/bin/make.cross
> # save the attached .config to linux build tree
> GCC_VERSION=8.1.0 make.cross ARCH=riscv
>
> All errors (new ones prefixed by >>):
>
> kernel/signal.c: In function '__do_sys_procfd_signal':
> >> kernel/signal.c:3341:7: error: implicit declaration of function 'proc_is_procfd'; did you mean 'clockid_to_fd'? [-Werror=implicit-function-declaration]
> if (!proc_is_procfd(f.file))
> ^~~~~~~~~~~~~~
On my radar and fixed. This happens when CONFIG_PROC_FS unset.
> clockid_to_fd
> cc1: some warnings being treated as errors
>
> vim +3341 kernel/signal.c
>
> 3314
> 3315 /**
> 3316 * sys_procfd_signal - send a signal to a process through a process file
> 3317 * descriptor
> 3318 * @fd: the file descriptor of the process
> 3319 * @sig: signal to be sent
> 3320 * @info: the signal info
> 3321 * @flags: future flags to be passed
> 3322 */
> 3323 SYSCALL_DEFINE4(procfd_signal, int, fd, int, sig, siginfo_t __user *, info,
> 3324 int, flags)
> 3325 {
> 3326 int ret;
> 3327 struct pid *pid;
> 3328 kernel_siginfo_t kinfo;
> 3329 struct fd f;
> 3330
> 3331 /* Enforce flags be set to 0 until we add an extension. */
> 3332 if (flags)
> 3333 return -EINVAL;
> 3334
> 3335 f = fdget_raw(fd);
> 3336 if (!f.file)
> 3337 return -EBADF;
> 3338
> 3339 ret = -EINVAL;
> 3340 /* Is this a process file descriptor? */
> > 3341 if (!proc_is_procfd(f.file))
> 3342 goto err;
> 3343
> 3344 pid = f.file->private_data;
> 3345 if (!pid)
> 3346 goto err;
> 3347
> 3348 if (info) {
> 3349 ret = __copy_siginfo_from_user(sig, &kinfo, info);
> 3350 if (unlikely(ret))
> 3351 goto err;
> 3352 /*
> 3353 * Not even root can pretend to send signals from the kernel.
> 3354 * Nor can they impersonate a kill()/tgkill(), which adds
> 3355 * source info.
> 3356 */
> 3357 ret = -EPERM;
> 3358 if ((kinfo.si_code >= 0 || kinfo.si_code == SI_TKILL) &&
> 3359 (task_pid(current) != pid))
> 3360 goto err;
> 3361 } else {
> 3362 prepare_kill_siginfo(sig, &kinfo);
> 3363 }
> 3364
> 3365 ret = kill_pid_info(sig, &kinfo, pid);
> 3366
> 3367 err:
> 3368 fdput(f);
> 3369 return ret;
> 3370 }
> 3371
>
> ---
> 0-DAY kernel test infrastructure Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all Intel Corporation
next prev parent reply other threads:[~2018-11-19 23:45 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-19 10:32 [PATCH v1 0/2] proc: allow signaling processes via file descriptors Christian Brauner
2018-11-19 10:32 ` [PATCH v1 1/2] proc: get process file descriptor from /proc/<pid> Christian Brauner
2018-11-19 15:32 ` Andy Lutomirski
2018-11-19 18:20 ` Christian Brauner
2018-11-19 10:32 ` [PATCH v1 2/2] signal: add procfd_signal() syscall Christian Brauner
2018-11-19 15:45 ` Andy Lutomirski
2018-11-19 15:57 ` Daniel Colascione
2018-11-19 18:39 ` Christian Brauner
2018-11-19 15:59 ` Daniel Colascione
2018-11-19 18:29 ` Christian Brauner
2018-11-19 19:02 ` Eric W. Biederman
2018-11-19 19:31 ` Christian Brauner
2018-11-19 19:39 ` Daniel Colascione
2018-11-19 17:10 ` Eugene Syromiatnikov
2018-11-19 18:23 ` Christian Brauner
2018-11-19 17:14 ` Eugene Syromiatnikov
2018-11-19 20:28 ` Aleksa Sarai
2018-11-19 20:55 ` Christian Brauner
2018-11-19 21:13 ` Christian Brauner
2018-11-19 21:18 ` Aleksa Sarai
2018-11-19 21:20 ` Christian Brauner
2018-11-19 21:21 ` Christian Brauner
2018-11-19 21:25 ` Aleksa Sarai
2018-11-19 21:26 ` Daniel Colascione
2018-11-19 21:36 ` Aleksa Sarai
2018-11-19 21:37 ` Christian Brauner
2018-11-19 21:41 ` Daniel Colascione
2018-11-20 4:59 ` Eric W. Biederman
2018-11-20 10:31 ` Christian Brauner
2018-11-21 21:39 ` Serge E. Hallyn
2018-11-19 21:23 ` Aleksa Sarai
2018-11-22 7:41 ` Serge E. Hallyn
2018-11-19 22:39 ` Tycho Andersen
2018-11-19 22:49 ` Daniel Colascione
2018-11-19 23:07 ` Tycho Andersen
2018-11-20 0:27 ` Andy Lutomirski
2018-11-20 0:32 ` Christian Brauner
2018-11-20 0:34 ` Andy Lutomirski
2018-11-20 0:49 ` Daniel Colascione
2018-11-22 7:48 ` Serge E. Hallyn
2018-11-19 23:35 ` kbuild test robot
2018-11-19 23:37 ` kbuild test robot
2018-11-19 23:45 ` Christian Brauner [this message]
2018-11-28 21:45 ` Joey Pabalinas
2018-11-28 22:05 ` Christian Brauner
2018-11-28 23:02 ` Joey Pabalinas
2018-11-19 10:32 ` [PATCH] procfd_signal.2: document procfd_signal syscall Christian Brauner
2018-11-20 13:29 ` Michael Kerrisk (man-pages)
2018-11-28 20:59 ` Florian Weimer
2018-11-28 21:12 ` Christian Brauner
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