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selftests/landlock: Skip scoped_signal subtest with MSG_OOB if not available

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MSG_OOB might be disabled in the kernel for unix sockets (by not
selecting CONFIG_AF_UNIX_OOB), and in this case the related tests
of the scoped_signal_test are currently failing.  Add a runtime
probe using socketpair() to detect MSG_OOB support and skip the
test gracefully if it is unavailable.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Link: https://patch.msgid.link/20260710081642.405916-1-thuth@redhat.com
Cc: stable@vger.kernel.org
Fixes: f34e9ce5f4 ("selftests/landlock: Test signal created by out-of-bound message")
Signed-off-by: Mickaël Salaün <mic@digikod.net>
This commit is contained in:
Thomas Huth 2026-07-10 10:16:42 +02:00 committed by Mickaël Salaün
parent d793186aa3
commit 5ab1dc6d11
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1 changed files with 21 additions and 0 deletions
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21
tools/testing/selftests/landlock/scoped_signal_test.c
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@ -400,6 +400,24 @@ static int setup_signal_handler(int signal)
return sigaction(SIGURG, &sa, NULL);
}
/*
* MSG_OOB might be disabled in the kernel via the CONFIG_AF_UNIX_OOB
* switch, so this function can be used for probing for its availability.
*/
static bool has_af_unix_oob(void)
{
bool available = false;
int sp[2];
if (socketpair(AF_UNIX, SOCK_STREAM, 0, sp) == 0) {
available = (send(sp[0], ".", 1, MSG_OOB) == 1);
close(sp[0]);
close(sp[1]);
}
return available;
}
/* clang-format off */
FIXTURE(fown) {};
/* clang-format on */
@ -462,6 +480,9 @@ TEST_F(fown, sigurg_socket)
int pipe_parent[2], pipe_child[2];
pid_t child;
if (!has_af_unix_oob())
SKIP(return, "CONFIG_AF_UNIX_OOB / MSG_OOB not available");
memset(&server_address, 0, sizeof(server_address));
set_unix_address(&server_address, 0);