[PATCH bpf v2] selftests: bpf: Fix bind on used port

[PATCH bpf v2] selftests: bpf: Fix bind on used port

[Felix Maurer]

The bind_perm BPF selftest failed when port 111/tcp was already in use
during the test. To fix this, the test now runs in its own network name
space.

To use unshare, it is necessary to reorder the includes. The style of
the includes is adapted to be consistent with the other prog_tests.

v2: Replace deprecated CHECK macro with ASSERT_OK

Fixes: 8259fdeb30326 ("selftests/bpf: Verify that rebinding to port < 1024 from BPF works")
Signed-off-by: Felix Maurer <fmaurer@redhat.com>
---
 .../selftests/bpf/prog_tests/bind_perm.c      | 20 ++++++++++++++++---
 1 file changed, 17 insertions(+), 3 deletions(-)

diff --git a/tools/testing/selftests/bpf/prog_tests/bind_perm.c b/tools/testing/selftests/bpf/prog_tests/bind_perm.c
index d0f06e40c16d..eac71fbb24ce 100644
--- a/tools/testing/selftests/bpf/prog_tests/bind_perm.c
+++ b/tools/testing/selftests/bpf/prog_tests/bind_perm.c
@@ -1,13 +1,24 @@
 // SPDX-License-Identifier: GPL-2.0
-#include <test_progs.h>
-#include "bind_perm.skel.h"
-
+#define _GNU_SOURCE
+#include <sched.h>
+#include <stdlib.h>
 #include <sys/types.h>
 #include <sys/socket.h>
 #include <sys/capability.h>
 
+#include "test_progs.h"
+#include "bind_perm.skel.h"
+
 static int duration;
 
+static int create_netns(void)
+{
+	if (!ASSERT_OK(unshare(CLONE_NEWNET), "create netns"))
+		return -1;
+
+	return 0;
+}
+
 void try_bind(int family, int port, int expected_errno)
 {
 	struct sockaddr_storage addr = {};
@@ -75,6 +86,9 @@ void test_bind_perm(void)
 	struct bind_perm *skel;
 	int cgroup_fd;
 
+	if (create_netns())
+		return;
+
 	cgroup_fd = test__join_cgroup("/bind_perm");
 	if (CHECK(cgroup_fd < 0, "cg-join", "errno %d", errno))
 		return;
-- 
2.34.1

Re: [PATCH bpf v2] selftests: bpf: Fix bind on used port

[Jakub Sitnicki]

On Tue, Jan 18, 2022 at 04:11 PM CET, Felix Maurer wrote:
> The bind_perm BPF selftest failed when port 111/tcp was already in use
> during the test. To fix this, the test now runs in its own network name
> space.
>
> To use unshare, it is necessary to reorder the includes. The style of
> the includes is adapted to be consistent with the other prog_tests.
>
> v2: Replace deprecated CHECK macro with ASSERT_OK
>
> Fixes: 8259fdeb30326 ("selftests/bpf: Verify that rebinding to port < 1024 from BPF works")
> Signed-off-by: Felix Maurer <fmaurer@redhat.com>
> ---

Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>

Re: [PATCH bpf v2] selftests: bpf: Fix bind on used port

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to bpf/bpf-next.git (master)
by Andrii Nakryiko <andrii@kernel.org>:

On Tue, 18 Jan 2022 16:11:56 +0100 you wrote:
> The bind_perm BPF selftest failed when port 111/tcp was already in use
> during the test. To fix this, the test now runs in its own network name
> space.
> 
> To use unshare, it is necessary to reorder the includes. The style of
> the includes is adapted to be consistent with the other prog_tests.
> 
> [...]

Here is the summary with links:
  - [bpf,v2] selftests: bpf: Fix bind on used port
    https://git.kernel.org/bpf/bpf-next/c/8c0be0631d81

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

Re: [PATCH bpf v2] selftests: bpf: Fix bind on used port

[Andrii Nakryiko]

On Fri, Jan 21, 2022 at 2:32 PM Jakub Sitnicki <jakub@cloudflare.com> wrote:
>
> On Tue, Jan 18, 2022 at 04:11 PM CET, Felix Maurer wrote:
> > The bind_perm BPF selftest failed when port 111/tcp was already in use
> > during the test. To fix this, the test now runs in its own network name
> > space.
> >
> > To use unshare, it is necessary to reorder the includes. The style of
> > the includes is adapted to be consistent with the other prog_tests.
> >
> > v2: Replace deprecated CHECK macro with ASSERT_OK
> >
> > Fixes: 8259fdeb30326 ("selftests/bpf: Verify that rebinding to port < 1024 from BPF works")
> > Signed-off-by: Felix Maurer <fmaurer@redhat.com>
> > ---
>
> Reviewed-by: Jakub Sitnicki <jakub@cloudflare.com>

I've applied it to bpf-next yesterday, patchbot missed it and I forgot
to follow up to notify, sorry.

Re: [PATCH bpf v2] selftests: bpf: Fix bind on used port

[Andrii Nakryiko]

On Fri, Jan 21, 2022 at 4:18 PM <patchwork-bot+netdevbpf@kernel.org> wrote:
>
> Hello:
>
> This patch was applied to bpf/bpf-next.git (master)
> by Andrii Nakryiko <andrii@kernel.org>:

Better late than never :)

>
> On Tue, 18 Jan 2022 16:11:56 +0100 you wrote:
> > The bind_perm BPF selftest failed when port 111/tcp was already in use
> > during the test. To fix this, the test now runs in its own network name
> > space.
> >
> > To use unshare, it is necessary to reorder the includes. The style of
> > the includes is adapted to be consistent with the other prog_tests.
> >
> > [...]
>
> Here is the summary with links:
>   - [bpf,v2] selftests: bpf: Fix bind on used port
>     https://git.kernel.org/bpf/bpf-next/c/8c0be0631d81
>
> You are awesome, thank you!
> --
> Deet-doot-dot, I am a bot.
> https://korg.docs.kernel.org/patchwork/pwbot.html
>
>