linux-kernel - Re: [PATCH 04/24] perf daemon: Add server socket support

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Date:   Sun, 7 Feb 2021 10:36:43 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Jiri Olsa <jolsa@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Michael Petlan <mpetlan@...hat.com>,
        Ian Rogers <irogers@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        Alexei Budankov <abudankov@...wei.com>
Subject: Re: [PATCH 04/24] perf daemon: Add server socket support

On Sun, Feb 7, 2021 at 4:04 AM Jiri Olsa <jolsa@...hat.com> wrote:
>
> On Fri, Feb 05, 2021 at 08:30:10PM +0900, Namhyung Kim wrote:
> > On Sun, Jan 31, 2021 at 8:49 AM Jiri Olsa <jolsa@...nel.org> wrote:
> > >
> > > Add support to create server socket that listens for client
> > > commands and process them.
> > >
> > > This patch adds only the core support, all commands using
> > > this functionality are coming in following patches.
> > >
> > > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > > ---
> > >  tools/perf/builtin-daemon.c | 101 +++++++++++++++++++++++++++++++++++-
> > >  1 file changed, 100 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/tools/perf/builtin-daemon.c b/tools/perf/builtin-daemon.c
> > > index 8d0ac44ec808..756d60616d7d 100644
> > > --- a/tools/perf/builtin-daemon.c
> > > +++ b/tools/perf/builtin-daemon.c
> > > @@ -1,5 +1,6 @@
> > >  // SPDX-License-Identifier: GPL-2.0
> > >  #include <subcmd/parse-options.h>
> > > +#include <api/fd/array.h>
> > >  #include <linux/limits.h>
> > >  #include <string.h>
> > >  #include <signal.h>
> > > @@ -7,6 +8,10 @@
> > >  #include <stdio.h>
> > >  #include <unistd.h>
> > >  #include <errno.h>
> > > +#include <sys/types.h>
> > > +#include <sys/socket.h>
> > > +#include <sys/un.h>
> > > +#include <poll.h>
> > >  #include "builtin.h"
> > >  #include "perf.h"
> > >  #include "debug.h"
> > > @@ -37,6 +42,78 @@ static void sig_handler(int sig __maybe_unused)
> > >         done = true;
> > >  }
> > >
> > > +static int setup_server_socket(struct daemon *daemon)
> > > +{
> > > +       struct sockaddr_un addr;
> > > +       char path[100];
> > > +       int fd;
> > > +
> > > +       fd = socket(AF_UNIX, SOCK_STREAM, 0);
> > > +       if (fd < 0) {
> > > +               fprintf(stderr, "socket: %s\n", strerror(errno));
> > > +               return -1;
> > > +       }
> > > +
> > > +       fcntl(fd, F_SETFD, FD_CLOEXEC);
> > > +
> > > +       scnprintf(path, PATH_MAX, "%s/control", daemon->base);
> >
> > I couldn't find where the default value of daemon->base is set.
> > Also 100 bytes seem not enough for the path name.
>
> 108 bytes is the limit of the unix socket path,
> I'm adding more checks on the provided base,
> so we display some reasonable error

Sgtm.

Thanks,
Namhyung