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selftests/namespaces: fourth inactive namespace resurrection test

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Test SIOCGSKNS across setns. Create a socket in netns A, switch to netns
B, verify SIOCGSKNS still returns netns A.

Link: https://patch.msgid.link/20251029-work-namespace-nstree-listns-v4-58-2e6f823ebdc0@kernel.org
Tested-by: syzbot@syzkaller.appspotmail.com
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-10-29 13:21:11 +01:00
parent 5aec9f455c
commit 40226da471
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 51 additions and 0 deletions
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51
tools/testing/selftests/namespaces/siocgskns_test.c
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@ -256,4 +256,55 @@ TEST(siocgskns_socket_types)
close(sock_udp);
}
/*
* Test SIOCGSKNS across setns.
* Create a socket in netns A, switch to netns B, verify SIOCGSKNS still
* returns netns A.
*/
TEST(siocgskns_across_setns)
{
int sock_fd, netns_a_fd, netns_b_fd, result_fd;
struct stat st_a;
/* Get current netns (A) */
netns_a_fd = open("/proc/self/ns/net", O_RDONLY);
ASSERT_GE(netns_a_fd, 0);
ASSERT_EQ(fstat(netns_a_fd, &st_a), 0);
/* Create socket in netns A */
sock_fd = socket(AF_INET, SOCK_STREAM, 0);
ASSERT_GE(sock_fd, 0);
/* Create new netns (B) */
ASSERT_EQ(unshare(CLONE_NEWNET), 0);
netns_b_fd = open("/proc/self/ns/net", O_RDONLY);
ASSERT_GE(netns_b_fd, 0);
/* Get netns from socket created in A */
result_fd = ioctl(sock_fd, SIOCGSKNS);
if (result_fd < 0) {
close(sock_fd);
setns(netns_a_fd, CLONE_NEWNET);
close(netns_a_fd);
close(netns_b_fd);
if (errno == ENOTTY || errno == EINVAL)
SKIP(return, "SIOCGSKNS not supported");
ASSERT_GE(result_fd, 0);
}
/* Verify it still points to netns A */
struct stat st_result_stat;
ASSERT_EQ(fstat(result_fd, &st_result_stat), 0);
ASSERT_EQ(st_a.st_ino, st_result_stat.st_ino);
close(result_fd);
close(sock_fd);
close(netns_b_fd);
/* Restore original netns */
ASSERT_EQ(setns(netns_a_fd, CLONE_NEWNET), 0);
close(netns_a_fd);
}
TEST_HARNESS_MAIN