diff options
Diffstat (limited to 'internal/generate/codegen_test.go')
| -rw-r--r-- | internal/generate/codegen_test.go | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/internal/generate/codegen_test.go b/internal/generate/codegen_test.go index be94724..baf47d1 100644 --- a/internal/generate/codegen_test.go +++ b/internal/generate/codegen_test.go @@ -84,6 +84,45 @@ func TestGenerateBindHandler(t *testing.T) { requireNotContains(t, output, "ev->ret_type = TRANSFER_CLASSIFIED;") } +// TestGenerateGetsocknameHandler locks in the generated BPF C for getsockname(2): +// +// int getsockname(int sockfd, struct sockaddr *addr, socklen_t *addrlen) +// +// getsockname returns the local address a socket is bound to and yields 0 on +// success or -1 on error. Its sockfd is at args[0], so the enter handler is a +// KindFd fd_event capturing ev->fd = args[0] — matching its socket siblings +// bind/connect/listen/accept/getpeername. The addr output pointer (args[1]) and +// the addrlen in/out pointer (args[2]) must NOT be captured: getsockname reads +// no path and copies no userspace buffer we track. The exit handler is a plain +// ret_event marked UNCLASSIFIED (0/-1, no byte count), so it must not carry a +// READ/WRITE/TRANSFER classification — guarding against any mistaken +// recvfrom/sendto-style byte-transfer accounting. +func TestGenerateGetsocknameHandler(t *testing.T) { + output := generateFromPair(t, FormatGetsockname, FormatExitGetsockname) + + // Enter: KindFd fd_event capturing the sockfd from args[0]. + requireContains(t, output, `SEC("tracepoint/syscalls/sys_enter_getsockname")`) + requireContains(t, output, "struct fd_event *ev = bpf_ringbuf_reserve(&event_map, sizeof(struct fd_event), 0);") + requireContains(t, output, "ev->event_type = ENTER_FD_EVENT;") + requireContains(t, output, "ev->trace_id = SYS_ENTER_GETSOCKNAME;") + requireContains(t, output, "ev->fd = (__s32)ctx->args[0];") + + // Negative guards: the sockaddr output pointer (args[1]) must never be read + // as a path/buffer, and the addrlen pointer (args[2]) must not be captured as + // another fd. + requireNotContains(t, output, "bpf_probe_read_user_str") + requireNotContains(t, output, "ev->fd = (__s32)ctx->args[1];") + requireNotContains(t, output, "ev->fd = (__s32)ctx->args[2];") + + // Exit: plain ret_event, UNCLASSIFIED (getsockname returns 0/-1, no byte count). + requireContains(t, output, `SEC("tracepoint/syscalls/sys_exit_getsockname")`) + requireContains(t, output, "struct ret_event *ev = bpf_ringbuf_reserve(&event_map, sizeof(struct ret_event), 0);") + requireContains(t, output, "ev->ret_type = UNCLASSIFIED;") + requireNotContains(t, output, "ev->ret_type = READ_CLASSIFIED;") + requireNotContains(t, output, "ev->ret_type = WRITE_CLASSIFIED;") + requireNotContains(t, output, "ev->ret_type = TRANSFER_CLASSIFIED;") +} + func TestGeneratePidfdGetfdHandlerUsesPidfdArgument(t *testing.T) { output := generateFromPair(t, FormatPidfdGetfd, FormatExitPidfdGetfd) |