From 8d285a3b2e83796d33ec3674b25fe0bfcc647e92 Mon Sep 17 00:00:00 2001 From: Jakub Sitnicki Date: Thu, 17 Oct 2019 10:37:52 +0200 Subject: [PATCH] selftests/bpf: Restore the netns after flow dissector reattach test flow_dissector_reattach test changes the netns we run in but does not restore it to the one we started in when finished. This interferes with tests that run after it. Fix it by restoring the netns when done. Fixes: f97eea1756f3 ("selftests/bpf: Check that flow dissector can be re-attached") Reported-by: Alexei Starovoitov Reported-by: Andrii Nakryiko Signed-off-by: Jakub Sitnicki Signed-off-by: Alexei Starovoitov Acked-by: Martin KaFai Lau Link: https://lore.kernel.org/bpf/20191017083752.30999-1-jakub@cloudflare.com --- .../bpf/prog_tests/flow_dissector_reattach.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/bpf/prog_tests/flow_dissector_reattach.c b/tools/testing/selftests/bpf/prog_tests/flow_dissector_reattach.c index 777faff..1f51ba6 100644 --- a/tools/testing/selftests/bpf/prog_tests/flow_dissector_reattach.c +++ b/tools/testing/selftests/bpf/prog_tests/flow_dissector_reattach.c @@ -91,12 +91,18 @@ out_close: void test_flow_dissector_reattach(void) { - int init_net, err; + int init_net, self_net, err; + + self_net = open("/proc/self/ns/net", O_RDONLY); + if (CHECK_FAIL(self_net < 0)) { + perror("open(/proc/self/ns/net"); + return; + } init_net = open("/proc/1/ns/net", O_RDONLY); if (CHECK_FAIL(init_net < 0)) { perror("open(/proc/1/ns/net)"); - return; + goto out_close; } err = setns(init_net, CLONE_NEWNET); @@ -108,7 +114,7 @@ void test_flow_dissector_reattach(void) if (is_attached(init_net)) { test__skip(); printf("Can't test with flow dissector attached to init_net\n"); - return; + goto out_setns; } /* First run tests in root network namespace */ @@ -118,10 +124,17 @@ void test_flow_dissector_reattach(void) err = unshare(CLONE_NEWNET); if (CHECK_FAIL(err)) { perror("unshare(CLONE_NEWNET)"); - goto out_close; + goto out_setns; } do_flow_dissector_reattach(); +out_setns: + /* Move back to netns we started in. */ + err = setns(self_net, CLONE_NEWNET); + if (CHECK_FAIL(err)) + perror("setns(/proc/self/ns/net)"); + out_close: close(init_net); + close(self_net); } -- 2.7.4