integration-test: add LSM

test-distro/src/init.rs

@@ -97,6 +97,14 @@ fn run() -> anyhow::Result<()> {
             data: None,
             target_mode: None,
         },
+        Mount {
+            source: "securityfs",
+            target: "/sys/kernel/security",
+            fstype: "securityfs",
+            flags: nix::mount::MsFlags::empty(),
+            data: None,
+            target_mode: None,
+        },
     ] {
         match target_mode {
             None => {

test/integration-ebpf/src/test.rs

@@ -4,24 +4,18 @@
 
 use aya_ebpf::{
     bindings::{bpf_ret_code, xdp_action},
-    macros::{flow_dissector, kprobe, kretprobe, tracepoint, uprobe, uretprobe, xdp},
+    macros::{flow_dissector, kprobe, kretprobe, lsm, tracepoint, uprobe, uretprobe, xdp},
     programs::{
-        FlowDissectorContext, ProbeContext, RetProbeContext, TracePointContext, XdpContext,
+        FlowDissectorContext, LsmContext, ProbeContext, RetProbeContext, TracePointContext,
+        XdpContext,
     },
 };
 #[cfg(not(test))]
 extern crate ebpf_panic;
 
 #[xdp]
-fn pass(ctx: XdpContext) -> u32 {
-    match unsafe { try_pass(ctx) } {
-        Ok(ret) => ret,
-        Err(_) => xdp_action::XDP_ABORTED,
-    }
-}
-
-unsafe fn try_pass(_ctx: XdpContext) -> Result<u32, u32> {
-    Ok(xdp_action::XDP_PASS)
+fn pass(_ctx: XdpContext) -> u32 {
+    xdp_action::XDP_PASS
 }
 
 #[kprobe]
@@ -55,3 +49,8 @@ fn test_flow(_ctx: FlowDissectorContext) -> u32 {
     // Linux kernel for inspiration.
     bpf_ret_code::BPF_FLOW_DISSECTOR_CONTINUE
 }
+
+#[lsm(hook = "socket_bind")]
+fn test_lsm(_ctx: LsmContext) -> i32 {
+    -1 // Disallow.
+}

test/integration-test/src/tests.rs

@@ -8,6 +8,7 @@ mod iter;
 mod linear_data_structures;
 mod load;
 mod log;
+mod lsm;
 mod map_pin;
 mod raw_tracepoint;
 mod rbpf;

test/integration-test/src/tests/lsm.rs

@@ -0,0 +1,50 @@
+use assert_matches::assert_matches;
+use aya::{
+    Btf, Ebpf,
+    programs::{Lsm, ProgramError, ProgramType},
+    sys::{SyscallError, is_program_supported},
+};
+
+macro_rules! expect_permission_denied {
+    ($result:expr) => {
+        let result = $result;
+        if !std::fs::read_to_string("/sys/kernel/security/lsm").unwrap().contains("bpf") {
+            assert_matches!(result, Ok(_));
+        } else {
+            assert_matches!(result, Err(e) => assert_eq!(
+                e.kind(), std::io::ErrorKind::PermissionDenied)
+            );
+        }
+    };
+}
+
+#[test]
+fn lsm() {
+    let btf = Btf::from_sys_fs().unwrap();
+
+    let mut bpf: Ebpf = Ebpf::load(crate::TEST).unwrap();
+    let prog = bpf.program_mut("test_lsm").unwrap();
+    let prog: &mut Lsm = prog.try_into().unwrap();
+    prog.load("socket_bind", &btf).unwrap();
+
+    assert_matches!(std::net::TcpListener::bind("127.0.0.1:0"), Ok(_));
+
+    let link_id = {
+        let result = prog.attach();
+        if !is_program_supported(ProgramType::Lsm).unwrap() {
+            assert_matches!(result, Err(ProgramError::SyscallError(SyscallError { call, io_error })) => {
+                assert_eq!(call, "bpf_raw_tracepoint_open");
+                assert_eq!(io_error.raw_os_error(), Some(524));
+            });
+            eprintln!("skipping test - LSM programs not supported");
+            return;
+        }
+        result.unwrap()
+    };
+
+    expect_permission_denied!(std::net::TcpListener::bind("127.0.0.1:0"));
+
+    prog.detach(link_id).unwrap();
+
+    assert_matches!(std::net::TcpListener::bind("127.0.0.1:0"), Ok(_));
+}