linux-kernel - Re: [PATCH 4.19 144/187] selftests/bpf: skip verifier tests for unsupported program types

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Date:   Thu, 23 May 2019 19:47:53 +0200
From:   "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
To:     Daniel Borkmann <daniel@...earbox.net>
Cc:     "Rantala, Tommi T. (Nokia - FI/Espoo)" <tommi.t.rantala@...ia.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "sashal@...nel.org" <sashal@...nel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "sdf@...gle.com" <sdf@...gle.com>
Subject: Re: [PATCH 4.19 144/187] selftests/bpf: skip verifier tests for
 unsupported program types

On Thu, May 23, 2019 at 03:46:26PM +0200, Daniel Borkmann wrote:
> On 05/23/2019 12:27 PM, Rantala, Tommi T. (Nokia - FI/Espoo) wrote:
> > On Thu, 2019-04-04 at 10:48 +0200, Greg Kroah-Hartman wrote:
> >> 4.19-stable review patch.  If anyone has any objections, please let
> >> me know.
> >>
> >> ------------------
> >>
> >> [ Upstream commit 8184d44c9a577a2f1842ed6cc844bfd4a9981d8e ]
> >>
> >> Use recently introduced bpf_probe_prog_type() to skip tests in the
> >> test_verifier() if bpf_verify_program() fails. The skipped test is
> >> indicated in the output.
> > 
> > Hi, this patch added in 4.19.34 causes test_verifier build failure, as
> > bpf_probe_prog_type() is not available:
> > 
> > gcc -Wall -O2 -I../../../include/uapi -I../../../lib -I../../../lib/bpf
> > -I../../../../include/generated -DHAVE_GENHDR
> > -I../../../include    test_verifier.c /root/linux-
> > 4.19.44/tools/testing/selftests/bpf/libbpf.a -lcap -lelf -lrt -lpthread
> > -o /root/linux-4.19.44/tools/testing/selftests/bpf/test_verifier
> > test_verifier.c: In function ‘do_test_single’:
> > test_verifier.c:12775:22: warning: implicit declaration of function
> > ‘bpf_probe_prog_type’; did you mean ‘bpf_program__set_type’? [-
> > Wimplicit-function-declaration]
> >   if (fd_prog < 0 && !bpf_probe_prog_type(prog_type, 0)) {
> >                       ^~~~~~~~~~~~~~~~~~~
> >                       bpf_program__set_type
> > /usr/bin/ld: /tmp/ccEtyLhk.o: in function `do_test_single':
> > test_verifier.c:(.text+0xa19): undefined reference to
> > `bpf_probe_prog_type'
> > collect2: error: ld returned 1 exit status
> > make[1]: *** [../lib.mk:152: /root/linux-
> > 4.19.44/tools/testing/selftests/bpf/test_verifier] Error 1
> 
> Looks like this kselftest one got auto-selected for stable? It's not
> strictly needed, so totally fine to drop.

Ok, will go revert this, sorry for the breakage.

greg k-h