netdev - Re: [PATCH v12 bpf-next 13/14] selftests/bpf: Add test for d

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Date:   Wed, 26 Aug 2020 11:30:30 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Jiri Olsa <jolsa@...nel.org>, Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Wenbo Zhang <ethercflow@...il.com>,
        Andrii Nakryiko <andriin@...com>,
        Network Development <netdev@...r.kernel.org>,
        bpf <bpf@...r.kernel.org>, Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        John Fastabend <john.fastabend@...il.com>,
        KP Singh <kpsingh@...omium.org>,
        Jesper Dangaard Brouer <brouer@...hat.com>
Subject: Re: [PATCH v12 bpf-next 13/14] selftests/bpf: Add test for d_path
 helper

On Tue, Aug 25, 2020 at 04:06:14PM -0700, Alexei Starovoitov wrote:
> On Tue, Aug 25, 2020 at 12:22 PM Jiri Olsa <jolsa@...nel.org> wrote:
> > +
> > +static int trigger_fstat_events(pid_t pid)
> > +{
> > +       int sockfd = -1, procfd = -1, devfd = -1;
> > +       int localfd = -1, indicatorfd = -1;
> > +       int pipefd[2] = { -1, -1 };
> > +       struct stat fileStat;
> > +       int ret = -1;
> > +
> > +       /* unmountable pseudo-filesystems */
> > +       if (CHECK(pipe(pipefd) < 0, "trigger", "pipe failed\n"))
> > +               return ret;
> > +       /* unmountable pseudo-filesystems */
> > +       sockfd = socket(AF_INET, SOCK_STREAM, 0);
> > +       if (CHECK(sockfd < 0, "trigger", "scoket failed\n"))
> > +               goto out_close;
> > +       /* mountable pseudo-filesystems */
> > +       procfd = open("/proc/self/comm", O_RDONLY);
> > +       if (CHECK(procfd < 0, "trigger", "open /proc/self/comm failed\n"))
> > +               goto out_close;
> > +       devfd = open("/dev/urandom", O_RDONLY);
> > +       if (CHECK(devfd < 0, "trigger", "open /dev/urandom failed\n"))
> > +               goto out_close;
> > +       localfd = open("/tmp/d_path_loadgen.txt", O_CREAT | O_RDONLY);
> 
> The work-in-progress CI caught a problem here:
> 
> In file included from /usr/include/fcntl.h:290:0,
> 4814                 from ./test_progs.h:29,
> 4815                 from
> /home/travis/build/tsipa/bpf-next/tools/testing/selftests/bpf/prog_tests/d_path.c:3:
> 4816In function ‘open’,
> 4817    inlined from ‘trigger_fstat_events’ at
> /home/travis/build/tsipa/bpf-next/tools/testing/selftests/bpf/prog_tests/d_path.c:50:10,
> 4818    inlined from ‘test_d_path’ at
> /home/travis/build/tsipa/bpf-next/tools/testing/selftests/bpf/prog_tests/d_path.c:119:6:
> 4819/usr/include/x86_64-linux-gnu/bits/fcntl2.h:50:4: error: call to
> ‘__open_missing_mode’ declared with attribute error: open with O_CREAT
> or O_TMPFILE in second argument needs 3 arguments
> 4820    __open_missing_mode ();
> 4821    ^~~~~~~~~~~~~~~~~~~~~~

ok, looks like it's missing the permission bits

> 
> I don't see this bug in my setup, since I'm using an older glibc that
> doesn't have this check,
> so I've pushed it anyway since it was taking a bit long to land and folks were
> eagerly waiting for the allowlist and d_path features.
> But some other folks may complain about build breakage really soon.
> So please follow up asap.

time to upadte my systems, I'm missing new warnings ;-)

I'll send the fix

thanks,
jirka