From: Yonghong Song yhs@fb.com
[ Upstream commit 69844e335d8c22454746c7903776533d8b4ab8fa ]
Commit f4e4534850a9 ("net/netlink: fix NETLINK_LIST_MEMBERSHIPS length report") fixed NETLINK_LIST_MEMBERSHIPS length report which caused selftest sockopt_sk failure. The failure log looks like
test_sockopt_sk:PASS:join_cgroup /sockopt_sk 0 nsec run_test:PASS:skel_load 0 nsec run_test:PASS:setsockopt_link 0 nsec run_test:PASS:getsockopt_link 0 nsec getsetsockopt:FAIL:Unexpected NETLINK_LIST_MEMBERSHIPS value unexpected Unexpected NETLINK_LIST_MEMBERSHIPS value: actual 8 != expected 4 run_test:PASS:getsetsockopt 0 nsec #201 sockopt_sk:FAIL
In net/netlink/af_netlink.c, function netlink_getsockopt(), for NETLINK_LIST_MEMBERSHIPS, nlk->ngroups equals to 36. Before Commit f4e4534850a9, the optlen is calculated as ALIGN(nlk->ngroups / 8, sizeof(u32)) = 4 After that commit, the optlen is ALIGN(BITS_TO_BYTES(nlk->ngroups), sizeof(u32)) = 8
Fix the test by setting the expected optlen to be 8.
Fixes: f4e4534850a9 ("net/netlink: fix NETLINK_LIST_MEMBERSHIPS length report") Signed-off-by: Yonghong Song yhs@fb.com Signed-off-by: Andrii Nakryiko andrii@kernel.org Link: https://lore.kernel.org/bpf/20230606172202.1606249-1-yhs@fb.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/testing/selftests/bpf/prog_tests/sockopt_sk.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/tools/testing/selftests/bpf/prog_tests/sockopt_sk.c b/tools/testing/selftests/bpf/prog_tests/sockopt_sk.c index 4512dd808c335..05d0e07da3942 100644 --- a/tools/testing/selftests/bpf/prog_tests/sockopt_sk.c +++ b/tools/testing/selftests/bpf/prog_tests/sockopt_sk.c @@ -209,7 +209,7 @@ static int getsetsockopt(void) err, errno); goto err; } - ASSERT_EQ(optlen, 4, "Unexpected NETLINK_LIST_MEMBERSHIPS value"); + ASSERT_EQ(optlen, 8, "Unexpected NETLINK_LIST_MEMBERSHIPS value");
free(big_buf); close(fd);