samples/bpf: remove obsolete tracing related tests

The samples/bpf has become outdated and often does not follow up with
the latest. This commit removes obsolete tracing-related tests.

Specifically, 'test_overhead' is duplicate with selftests (and bench),
and 'test_override_return', 'test_probe_write_user' tests are obsolete
since they have been replaced by kprobe_multi_override and probe_user
from selftests respectively.

The following files are removed:
- test_overhead: tests the overhead of BPF programs with task_rename,
  now covered by selftests and benchmark tests (rename-*). [1]

- test_override_return: tests the return override functionality, now
  handled by kprobe_multi_override in selftests.

- test_probe_write_user: tests the probe_write_user functionality,
  now replaced by the probe_user test in selftests.

This cleanup will help to streamline the testing framework by removing
redundant tests.

[1]: https://patchwork.kernel.org/cover/13759916

Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Link: https://lore.kernel.org/r/20241011044847.51584-5-danieltimlee@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 0 insertions, 52 deletions

diff --git a/samples/bpf/test_probe_write_user.bpf.c b/samples/bpf/test_probe_write_user.bpf.c
deleted file mode 100644
index a4f3798b7fb0..000000000000
--- a/samples/bpf/test_probe_write_user.bpf.c
+++ /dev/null
@@ -1,52 +0,0 @@
-/* Copyright (c) 2016 Sargun Dhillon <sargun@sargun.me>
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of version 2 of the GNU General Public
- * License as published by the Free Software Foundation.
- */
-#include "vmlinux.h"
-#include <string.h>
-#include <linux/version.h>
-#include <bpf/bpf_helpers.h>
-#include <bpf/bpf_tracing.h>
-#include <bpf/bpf_core_read.h>
-
-struct {
-	__uint(type, BPF_MAP_TYPE_HASH);
-	__type(key, struct sockaddr_in);
-	__type(value, struct sockaddr_in);
-	__uint(max_entries, 256);
-} dnat_map SEC(".maps");
-
-/* kprobe is NOT a stable ABI
- * kernel functions can be removed, renamed or completely change semantics.
- * Number of arguments and their positions can change, etc.
- * In such case this bpf+kprobe example will no longer be meaningful
- *
- * This example sits on a syscall, and the syscall ABI is relatively stable
- * of course, across platforms, and over time, the ABI may change.
- */
-SEC("ksyscall/connect")
-int BPF_KSYSCALL(bpf_prog1, int fd, struct sockaddr_in *uservaddr,
-		 int addrlen)
-{
-	struct sockaddr_in new_addr, orig_addr = {};
-	struct sockaddr_in *mapped_addr;
-
-	if (addrlen > sizeof(orig_addr))
-		return 0;
-
-	if (bpf_probe_read_user(&orig_addr, sizeof(orig_addr), uservaddr) != 0)
-		return 0;
-
-	mapped_addr = bpf_map_lookup_elem(&dnat_map, &orig_addr);
-	if (mapped_addr != NULL) {
-		memcpy(&new_addr, mapped_addr, sizeof(new_addr));
-		bpf_probe_write_user(uservaddr, &new_addr,
-				     sizeof(new_addr));
-	}
-	return 0;
-}
-
-char _license[] SEC("license") = "GPL";
-u32 _version SEC("version") = LINUX_VERSION_CODE;