samples/bpf: remove obsolete cgroup related tests

This patch removes the obsolete cgroup related tests. These tests are
now redundant because their functionality is already covered by more
modern and comprehensive tests under selftests/bpf.

The following files are removed:
- test_current_task_under_cgroup: tests bpf_current_task_under_cgroup()
  to check if a task belongs to a cgroup. Already covered by
  task_under_cgroup at selftest and other cgroup ID tests.

- test_cgrp2_tc: tests bpf_skb_under_cgroup() to filter packets based
  on cgroup. This behavior is now validated by cgroup_skb_sk_lookup,
  which uses bpf_skb_cgroup_id, making this test redundant.

By removing these outdated tests, this patch helps streamline and
modernize the test suite, avoiding duplication of test coverage.

Signed-off-by: Daniel T. Lee <danieltimlee@gmail.com>
Link: https://lore.kernel.org/r/20241011044847.51584-4-danieltimlee@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

7 files changed, 0 insertions, 693 deletions

diff --git a/samples/bpf/Makefile b/samples/bpf/Makefile
index 490833f8706a..e2abfc847389 100644
--- a/samples/bpf/Makefile
+++ b/samples/bpf/Makefile
@@ -25,10 +25,7 @@ tprogs-y += offwaketime
 tprogs-y += spintest
 tprogs-y += map_perf_test
 tprogs-y += test_overhead
-tprogs-y += test_cgrp2_array_pin
-tprogs-y += test_cgrp2_attach
 tprogs-y += xdp_router_ipv4
-tprogs-y += test_current_task_under_cgroup
 tprogs-y += trace_event
 tprogs-y += sampleip
 tprogs-y += tc_l2_redirect
@@ -72,10 +69,6 @@ offwaketime-objs := offwaketime_user.o $(TRACE_HELPERS)
 spintest-objs := spintest_user.o $(TRACE_HELPERS)
 map_perf_test-objs := map_perf_test_user.o
 test_overhead-objs := test_overhead_user.o
-test_cgrp2_array_pin-objs := test_cgrp2_array_pin.o
-test_cgrp2_attach-objs := test_cgrp2_attach.o
-test_current_task_under_cgroup-objs := $(CGROUP_HELPERS) \
-				       test_current_task_under_cgroup_user.o
 trace_event-objs := trace_event_user.o $(TRACE_HELPERS)
 sampleip-objs := sampleip_user.o $(TRACE_HELPERS)
 tc_l2_redirect-objs := tc_l2_redirect_user.o
@@ -116,8 +109,6 @@ always-y += test_overhead_tp.bpf.o
 always-y += test_overhead_raw_tp.bpf.o
 always-y += test_overhead_kprobe.bpf.o
 always-y += parse_varlen.o parse_simple.o parse_ldabs.o
-always-y += test_cgrp2_tc.bpf.o
-always-y += test_current_task_under_cgroup.bpf.o
 always-y += trace_event_kern.o
 always-y += sampleip_kern.o
 always-y += lwt_len_hist.bpf.o
diff --git a/samples/bpf/test_cgrp2_array_pin.c b/samples/bpf/test_cgrp2_array_pin.c
deleted file mode 100644
index 05e88aa63009..000000000000
--- a/samples/bpf/test_cgrp2_array_pin.c
+++ /dev/null
@@ -1,106 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/* Copyright (c) 2016 Facebook
- */
-#include <linux/unistd.h>
-#include <linux/bpf.h>
-
-#include <stdio.h>
-#include <stdint.h>
-#include <unistd.h>
-#include <string.h>
-#include <errno.h>
-#include <fcntl.h>
-
-#include <bpf/bpf.h>
-
-static void usage(void)
-{
-	printf("Usage: test_cgrp2_array_pin [...]\n");
-	printf("       -F <file>   File to pin an BPF cgroup array\n");
-	printf("       -U <file>   Update an already pinned BPF cgroup array\n");
-	printf("       -v <value>  Full path of the cgroup2\n");
-	printf("       -h          Display this help\n");
-}
-
-int main(int argc, char **argv)
-{
-	const char *pinned_file = NULL, *cg2 = NULL;
-	int create_array = 1;
-	int array_key = 0;
-	int array_fd = -1;
-	int cg2_fd = -1;
-	int ret = -1;
-	int opt;
-
-	while ((opt = getopt(argc, argv, "F:U:v:")) != -1) {
-		switch (opt) {
-		/* General args */
-		case 'F':
-			pinned_file = optarg;
-			break;
-		case 'U':
-			pinned_file = optarg;
-			create_array = 0;
-			break;
-		case 'v':
-			cg2 = optarg;
-			break;
-		default:
-			usage();
-			goto out;
-		}
-	}
-
-	if (!cg2 || !pinned_file) {
-		usage();
-		goto out;
-	}
-
-	cg2_fd = open(cg2, O_RDONLY);
-	if (cg2_fd < 0) {
-		fprintf(stderr, "open(%s,...): %s(%d)\n",
-			cg2, strerror(errno), errno);
-		goto out;
-	}
-
-	if (create_array) {
-		array_fd = bpf_map_create(BPF_MAP_TYPE_CGROUP_ARRAY, NULL,
-					  sizeof(uint32_t), sizeof(uint32_t),
-					  1, NULL);
-		if (array_fd < 0) {
-			fprintf(stderr,
-				"bpf_create_map(BPF_MAP_TYPE_CGROUP_ARRAY,...): %s(%d)\n",
-				strerror(errno), errno);
-			goto out;
-		}
-	} else {
-		array_fd = bpf_obj_get(pinned_file);
-		if (array_fd < 0) {
-			fprintf(stderr, "bpf_obj_get(%s): %s(%d)\n",
-				pinned_file, strerror(errno), errno);
-			goto out;
-		}
-	}
-
-	ret = bpf_map_update_elem(array_fd, &array_key, &cg2_fd, 0);
-	if (ret) {
-		perror("bpf_map_update_elem");
-		goto out;
-	}
-
-	if (create_array) {
-		ret = bpf_obj_pin(array_fd, pinned_file);
-		if (ret) {
-			fprintf(stderr, "bpf_obj_pin(..., %s): %s(%d)\n",
-				pinned_file, strerror(errno), errno);
-			goto out;
-		}
-	}
-
-out:
-	if (array_fd != -1)
-		close(array_fd);
-	if (cg2_fd != -1)
-		close(cg2_fd);
-	return ret;
-}
diff --git a/samples/bpf/test_cgrp2_attach.c b/samples/bpf/test_cgrp2_attach.c
deleted file mode 100644
index 68ce69457afe..000000000000
--- a/samples/bpf/test_cgrp2_attach.c
+++ /dev/null
@@ -1,177 +0,0 @@
-/* eBPF example program:
- *
- * - Creates arraymap in kernel with 4 bytes keys and 8 byte values
- *
- * - Loads eBPF program
- *
- *   The eBPF program accesses the map passed in to store two pieces of
- *   information. The number of invocations of the program, which maps
- *   to the number of packets received, is stored to key 0. Key 1 is
- *   incremented on each iteration by the number of bytes stored in
- *   the skb.
- *
- * - Attaches the new program to a cgroup using BPF_PROG_ATTACH
- *
- * - Every second, reads map[0] and map[1] to see how many bytes and
- *   packets were seen on any socket of tasks in the given cgroup.
- */
-
-#define _GNU_SOURCE
-
-#include <stdio.h>
-#include <stdlib.h>
-#include <stddef.h>
-#include <string.h>
-#include <unistd.h>
-#include <assert.h>
-#include <errno.h>
-#include <fcntl.h>
-
-#include <linux/bpf.h>
-#include <bpf/bpf.h>
-
-#include "bpf_insn.h"
-#include "bpf_util.h"
-
-enum {
-	MAP_KEY_PACKETS,
-	MAP_KEY_BYTES,
-};
-
-char bpf_log_buf[BPF_LOG_BUF_SIZE];
-
-static int prog_load(int map_fd, int verdict)
-{
-	struct bpf_insn prog[] = {
-		BPF_MOV64_REG(BPF_REG_6, BPF_REG_1), /* save r6 so it's not clobbered by BPF_CALL */
-
-		/* Count packets */
-		BPF_MOV64_IMM(BPF_REG_0, MAP_KEY_PACKETS), /* r0 = 0 */
-		BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_0, -4), /* *(u32 *)(fp - 4) = r0 */
-		BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
-		BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4), /* r2 = fp - 4 */
-		BPF_LD_MAP_FD(BPF_REG_1, map_fd), /* load map fd to r1 */
-		BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
-		BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
-		BPF_MOV64_IMM(BPF_REG_1, 1), /* r1 = 1 */
-		BPF_ATOMIC_OP(BPF_DW, BPF_ADD, BPF_REG_0, BPF_REG_1, 0),
-
-		/* Count bytes */
-		BPF_MOV64_IMM(BPF_REG_0, MAP_KEY_BYTES), /* r0 = 1 */
-		BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_0, -4), /* *(u32 *)(fp - 4) = r0 */
-		BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
-		BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4), /* r2 = fp - 4 */
-		BPF_LD_MAP_FD(BPF_REG_1, map_fd),
-		BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
-		BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
-		BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_6, offsetof(struct __sk_buff, len)), /* r1 = skb->len */
-
-		BPF_ATOMIC_OP(BPF_DW, BPF_ADD, BPF_REG_0, BPF_REG_1, 0),
-
-		BPF_MOV64_IMM(BPF_REG_0, verdict), /* r0 = verdict */
-		BPF_EXIT_INSN(),
-	};
-	size_t insns_cnt = ARRAY_SIZE(prog);
-	LIBBPF_OPTS(bpf_prog_load_opts, opts,
-		.log_buf = bpf_log_buf,
-		.log_size = BPF_LOG_BUF_SIZE,
-	);
-
-	return bpf_prog_load(BPF_PROG_TYPE_CGROUP_SKB, NULL, "GPL",
-			     prog, insns_cnt, &opts);
-}
-
-static int usage(const char *argv0)
-{
-	printf("Usage: %s [-d] [-D] <cg-path> <egress|ingress>\n", argv0);
-	printf("	-d	Drop Traffic\n");
-	printf("	-D	Detach filter, and exit\n");
-	return EXIT_FAILURE;
-}
-
-static int attach_filter(int cg_fd, int type, int verdict)
-{
-	int prog_fd, map_fd, ret, key;
-	long long pkt_cnt, byte_cnt;
-
-	map_fd = bpf_map_create(BPF_MAP_TYPE_ARRAY, NULL,
-				sizeof(key), sizeof(byte_cnt),
-				256, NULL);
-	if (map_fd < 0) {
-		printf("Failed to create map: '%s'\n", strerror(errno));
-		return EXIT_FAILURE;
-	}
-
-	prog_fd = prog_load(map_fd, verdict);
-	printf("Output from kernel verifier:\n%s\n-------\n", bpf_log_buf);
-
-	if (prog_fd < 0) {
-		printf("Failed to load prog: '%s'\n", strerror(errno));
-		return EXIT_FAILURE;
-	}
-
-	ret = bpf_prog_attach(prog_fd, cg_fd, type, 0);
-	if (ret < 0) {
-		printf("Failed to attach prog to cgroup: '%s'\n",
-		       strerror(errno));
-		return EXIT_FAILURE;
-	}
-	while (1) {
-		key = MAP_KEY_PACKETS;
-		assert(bpf_map_lookup_elem(map_fd, &key, &pkt_cnt) == 0);
-
-		key = MAP_KEY_BYTES;
-		assert(bpf_map_lookup_elem(map_fd, &key, &byte_cnt) == 0);
-
-		printf("cgroup received %lld packets, %lld bytes\n",
-		       pkt_cnt, byte_cnt);
-		sleep(1);
-	}
-
-	return EXIT_SUCCESS;
-}
-
-int main(int argc, char **argv)
-{
-	int detach_only = 0, verdict = 1;
-	enum bpf_attach_type type;
-	int opt, cg_fd, ret;
-
-	while ((opt = getopt(argc, argv, "Dd")) != -1) {
-		switch (opt) {
-		case 'd':
-			verdict = 0;
-			break;
-		case 'D':
-			detach_only = 1;
-			break;
-		default:
-			return usage(argv[0]);
-		}
-	}
-
-	if (argc - optind < 2)
-		return usage(argv[0]);
-
-	if (strcmp(argv[optind + 1], "ingress") == 0)
-		type = BPF_CGROUP_INET_INGRESS;
-	else if (strcmp(argv[optind + 1], "egress") == 0)
-		type = BPF_CGROUP_INET_EGRESS;
-	else
-		return usage(argv[0]);
-
-	cg_fd = open(argv[optind], O_DIRECTORY | O_RDONLY);
-	if (cg_fd < 0) {
-		printf("Failed to open cgroup path: '%s'\n", strerror(errno));
-		return EXIT_FAILURE;
-	}
-
-	if (detach_only) {
-		ret = bpf_prog_detach(cg_fd, type);
-		printf("bpf_prog_detach() returned '%s' (%d)\n",
-		       strerror(errno), errno);
-	} else
-		ret = attach_filter(cg_fd, type, verdict);
-
-	return ret;
-}
diff --git a/samples/bpf/test_cgrp2_tc.bpf.c b/samples/bpf/test_cgrp2_tc.bpf.c
deleted file mode 100644
index c7d2291d676f..000000000000
--- a/samples/bpf/test_cgrp2_tc.bpf.c
+++ /dev/null
@@ -1,56 +0,0 @@
-/* Copyright (c) 2016 Facebook
- *
- * 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.
- */
-#define KBUILD_MODNAME "foo"
-#include "vmlinux.h"
-#include "net_shared.h"
-#include <bpf/bpf_helpers.h>
-
-/* copy of 'struct ethhdr' without __packed */
-struct eth_hdr {
-	unsigned char   h_dest[ETH_ALEN];
-	unsigned char   h_source[ETH_ALEN];
-	unsigned short  h_proto;
-};
-
-struct {
-	__uint(type, BPF_MAP_TYPE_CGROUP_ARRAY);
-	__type(key, u32);
-	__type(value, u32);
-	__uint(pinning, LIBBPF_PIN_BY_NAME);
-	__uint(max_entries, 1);
-} test_cgrp2_array_pin SEC(".maps");
-
-SEC("filter")
-int handle_egress(struct __sk_buff *skb)
-{
-	void *data = (void *)(long)skb->data;
-	struct eth_hdr *eth = data;
-	struct ipv6hdr *ip6h = data + sizeof(*eth);
-	void *data_end = (void *)(long)skb->data_end;
-	char dont_care_msg[] = "dont care %04x %d\n";
-	char pass_msg[] = "pass\n";
-	char reject_msg[] = "reject\n";
-
-	/* single length check */
-	if (data + sizeof(*eth) + sizeof(*ip6h) > data_end)
-		return TC_ACT_OK;
-
-	if (eth->h_proto != bpf_htons(ETH_P_IPV6) ||
-	    ip6h->nexthdr != IPPROTO_ICMPV6) {
-		bpf_trace_printk(dont_care_msg, sizeof(dont_care_msg),
-				 eth->h_proto, ip6h->nexthdr);
-		return TC_ACT_OK;
-	} else if (bpf_skb_under_cgroup(skb, &test_cgrp2_array_pin, 0) != 1) {
-		bpf_trace_printk(pass_msg, sizeof(pass_msg));
-		return TC_ACT_OK;
-	} else {
-		bpf_trace_printk(reject_msg, sizeof(reject_msg));
-		return TC_ACT_SHOT;
-	}
-}
-
-char _license[] SEC("license") = "GPL";
diff --git a/samples/bpf/test_cgrp2_tc.sh b/samples/bpf/test_cgrp2_tc.sh
deleted file mode 100755
index 38e8dbc9d16e..000000000000
--- a/samples/bpf/test_cgrp2_tc.sh
+++ /dev/null
@@ -1,187 +0,0 @@
-#!/bin/bash
-# SPDX-License-Identifier: GPL-2.0
-
-MY_DIR=$(dirname $0)
-# Details on the bpf prog
-BPF_CGRP2_ARRAY_NAME='test_cgrp2_array_pin'
-BPF_PROG="$MY_DIR/test_cgrp2_tc.bpf.o"
-BPF_SECTION='filter'
-
-[ -z "$TC" ] && TC='tc'
-[ -z "$IP" ] && IP='ip'
-
-# Names of the veth interface, net namespace...etc.
-HOST_IFC='ve'
-NS_IFC='vens'
-NS='ns'
-
-find_mnt() {
-    cat /proc/mounts | \
-	awk '{ if ($3 == "'$1'" && mnt == "") { mnt = $2 }} END { print mnt }'
-}
-
-# Init cgroup2 vars
-init_cgrp2_vars() {
-    CGRP2_ROOT=$(find_mnt cgroup2)
-    if [ -z "$CGRP2_ROOT" ]
-    then
-	CGRP2_ROOT='/mnt/cgroup2'
-	MOUNT_CGRP2="yes"
-    fi
-    CGRP2_TC="$CGRP2_ROOT/tc"
-    CGRP2_TC_LEAF="$CGRP2_TC/leaf"
-}
-
-# Init bpf fs vars
-init_bpf_fs_vars() {
-    local bpf_fs_root=$(find_mnt bpf)
-    [ -n "$bpf_fs_root" ] || return -1
-    BPF_FS_TC_SHARE="$bpf_fs_root/tc/globals"
-}
-
-setup_cgrp2() {
-    case $1 in
-	start)
-	    if [ "$MOUNT_CGRP2" == 'yes' ]
-	    then
-		[ -d $CGRP2_ROOT ] || mkdir -p $CGRP2_ROOT
-		mount -t cgroup2 none $CGRP2_ROOT || return $?
-	    fi
-	    mkdir -p $CGRP2_TC_LEAF
-	    ;;
-	*)
-	    rmdir $CGRP2_TC_LEAF && rmdir $CGRP2_TC
-	    [ "$MOUNT_CGRP2" == 'yes' ] && umount $CGRP2_ROOT
-	    ;;
-    esac
-}
-
-setup_bpf_cgrp2_array() {
-    local bpf_cgrp2_array="$BPF_FS_TC_SHARE/$BPF_CGRP2_ARRAY_NAME"
-    case $1 in
-	start)
-	    $MY_DIR/test_cgrp2_array_pin -U $bpf_cgrp2_array -v $CGRP2_TC
-	    ;;
-	*)
-	    [ -d "$BPF_FS_TC_SHARE" ] && rm -f $bpf_cgrp2_array
-	    ;;
-    esac
-}
-
-setup_net() {
-    case $1 in
-	start)
-	    $IP link add $HOST_IFC type veth peer name $NS_IFC || return $?
-	    $IP link set dev $HOST_IFC up || return $?
-	    sysctl -q net.ipv6.conf.$HOST_IFC.disable_ipv6=0
-	    sysctl -q net.ipv6.conf.$HOST_IFC.accept_dad=0
-
-	    $IP netns add $NS || return $?
-	    $IP link set dev $NS_IFC netns $NS || return $?
-	    $IP -n $NS link set dev $NS_IFC up || return $?
-	    $IP netns exec $NS sysctl -q net.ipv6.conf.$NS_IFC.disable_ipv6=0
-	    $IP netns exec $NS sysctl -q net.ipv6.conf.$NS_IFC.accept_dad=0
-	    $TC qdisc add dev $HOST_IFC clsact || return $?
-	    $TC filter add dev $HOST_IFC egress bpf da obj $BPF_PROG sec $BPF_SECTION || return $?
-	    ;;
-	*)
-	    $IP netns del $NS
-	    $IP link del $HOST_IFC
-	    ;;
-    esac
-}
-
-run_in_cgrp() {
-    # Fork another bash and move it under the specified cgroup.
-    # It makes the cgroup cleanup easier at the end of the test.
-    cmd='echo $$ > '
-    cmd="$cmd $1/cgroup.procs; exec $2"
-    bash -c "$cmd"
-}
-
-do_test() {
-    run_in_cgrp $CGRP2_TC_LEAF "ping -6 -c3 ff02::1%$HOST_IFC >& /dev/null"
-    local dropped=$($TC -s qdisc show dev $HOST_IFC | tail -3 | \
-			   awk '/drop/{print substr($7, 0, index($7, ",")-1)}')
-    if [[ $dropped -eq 0 ]]
-    then
-	echo "FAIL"
-	return 1
-    else
-	echo "Successfully filtered $dropped packets"
-	return 0
-    fi
-}
-
-do_exit() {
-    if [ "$DEBUG" == "yes" ] && [ "$MODE" != 'cleanuponly' ]
-    then
-	echo "------ DEBUG ------"
-	echo "mount: "; mount | grep -E '(cgroup2|bpf)'; echo
-	echo "$CGRP2_TC_LEAF: "; ls -l $CGRP2_TC_LEAF; echo
-	if [ -d "$BPF_FS_TC_SHARE" ]
-	then
-	    echo "$BPF_FS_TC_SHARE: "; ls -l $BPF_FS_TC_SHARE; echo
-	fi
-	echo "Host net:"
-	$IP netns
-	$IP link show dev $HOST_IFC
-	$IP -6 a show dev $HOST_IFC
-	$TC -s qdisc show dev $HOST_IFC
-	echo
-	echo "$NS net:"
-	$IP -n $NS link show dev $NS_IFC
-	$IP -n $NS -6 link show dev $NS_IFC
-	echo "------ DEBUG ------"
-	echo
-    fi
-
-    if [ "$MODE" != 'nocleanup' ]
-    then
-	setup_net stop
-	setup_bpf_cgrp2_array stop
-	setup_cgrp2 stop
-    fi
-}
-
-init_cgrp2_vars
-init_bpf_fs_vars
-
-while [[ $# -ge 1 ]]
-do
-    a="$1"
-    case $a in
-	debug)
-	    DEBUG='yes'
-	    shift 1
-	    ;;
-	cleanup-only)
-	    MODE='cleanuponly'
-	    shift 1
-	    ;;
-	no-cleanup)
-	    MODE='nocleanup'
-	    shift 1
-	    ;;
-	*)
-	    echo "test_cgrp2_tc [debug] [cleanup-only | no-cleanup]"
-	    echo "  debug: Print cgrp and network setup details at the end of the test"
-	    echo "  cleanup-only: Try to cleanup things from last test.  No test will be run"
-	    echo "  no-cleanup: Run the test but don't do cleanup at the end"
-	    echo "[Note: If no arg is given, it will run the test and do cleanup at the end]"
-	    echo
-	    exit -1
-	    ;;
-    esac
-done
-
-trap do_exit 0
-
-[ "$MODE" == 'cleanuponly' ] && exit
-
-setup_cgrp2 start || exit $?
-setup_net start || exit $?
-init_bpf_fs_vars || exit $?
-setup_bpf_cgrp2_array start || exit $?
-do_test
-echo
diff --git a/samples/bpf/test_current_task_under_cgroup.bpf.c b/samples/bpf/test_current_task_under_cgroup.bpf.c
deleted file mode 100644
index 58b9cf7ed659..000000000000
--- a/samples/bpf/test_current_task_under_cgroup.bpf.c
+++ /dev/null
@@ -1,43 +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 <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_CGROUP_ARRAY);
-	__uint(key_size, sizeof(u32));
-	__uint(value_size, sizeof(u32));
-	__uint(max_entries, 1);
-} cgroup_map SEC(".maps");
-
-struct {
-	__uint(type, BPF_MAP_TYPE_ARRAY);
-	__type(key, u32);
-	__type(value, u64);
-	__uint(max_entries, 1);
-} perf_map SEC(".maps");
-
-/* Writes the last PID that called sync to a map at index 0 */
-SEC("ksyscall/sync")
-int BPF_KSYSCALL(bpf_prog1)
-{
-	u64 pid = bpf_get_current_pid_tgid();
-	int idx = 0;
-
-	if (!bpf_current_task_under_cgroup(&cgroup_map, 0))
-		return 0;
-
-	bpf_map_update_elem(&perf_map, &idx, &pid, BPF_ANY);
-	return 0;
-}
-
-char _license[] SEC("license") = "GPL";
-u32 _version SEC("version") = LINUX_VERSION_CODE;
diff --git a/samples/bpf/test_current_task_under_cgroup_user.c b/samples/bpf/test_current_task_under_cgroup_user.c
deleted file mode 100644
index 9726ed2a8a8b..000000000000
--- a/samples/bpf/test_current_task_under_cgroup_user.c
+++ /dev/null
@@ -1,115 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/* Copyright (c) 2016 Sargun Dhillon <sargun@sargun.me>
- */
-
-#define _GNU_SOURCE
-#include <stdio.h>
-#include <unistd.h>
-#include <bpf/bpf.h>
-#include <bpf/libbpf.h>
-#include "cgroup_helpers.h"
-
-#define CGROUP_PATH		"/my-cgroup"
-
-int main(int argc, char **argv)
-{
-	pid_t remote_pid, local_pid = getpid();
-	int cg2 = -1, idx = 0, rc = 1;
-	struct bpf_link *link = NULL;
-	struct bpf_program *prog;
-	struct bpf_object *obj;
-	char filename[256];
-	int map_fd[2];
-
-	snprintf(filename, sizeof(filename), "%s.bpf.o", argv[0]);
-	obj = bpf_object__open_file(filename, NULL);
-	if (libbpf_get_error(obj)) {
-		fprintf(stderr, "ERROR: opening BPF object file failed\n");
-		return 0;
-	}
-
-	prog = bpf_object__find_program_by_name(obj, "bpf_prog1");
-	if (!prog) {
-		printf("finding a prog in obj file failed\n");
-		goto cleanup;
-	}
-
-	/* load BPF program */
-	if (bpf_object__load(obj)) {
-		fprintf(stderr, "ERROR: loading BPF object file failed\n");
-		goto cleanup;
-	}
-
-	map_fd[0] = bpf_object__find_map_fd_by_name(obj, "cgroup_map");
-	map_fd[1] = bpf_object__find_map_fd_by_name(obj, "perf_map");
-	if (map_fd[0] < 0 || map_fd[1] < 0) {
-		fprintf(stderr, "ERROR: finding a map in obj file failed\n");
-		goto cleanup;
-	}
-
-	link = bpf_program__attach(prog);
-	if (libbpf_get_error(link)) {
-		fprintf(stderr, "ERROR: bpf_program__attach failed\n");
-		link = NULL;
-		goto cleanup;
-	}
-
-	if (setup_cgroup_environment())
-		goto err;
-
-	cg2 = create_and_get_cgroup(CGROUP_PATH);
-
-	if (cg2 < 0)
-		goto err;
-
-	if (bpf_map_update_elem(map_fd[0], &idx, &cg2, BPF_ANY)) {
-		log_err("Adding target cgroup to map");
-		goto err;
-	}
-
-	if (join_cgroup(CGROUP_PATH))
-		goto err;
-
-	/*
-	 * The installed helper program catched the sync call, and should
-	 * write it to the map.
-	 */
-
-	sync();
-	bpf_map_lookup_elem(map_fd[1], &idx, &remote_pid);
-
-	if (local_pid != remote_pid) {
-		fprintf(stderr,
-			"BPF Helper didn't write correct PID to map, but: %d\n",
-			remote_pid);
-		goto err;
-	}
-
-	/* Verify the negative scenario; leave the cgroup */
-	if (join_cgroup("/"))
-		goto err;
-
-	remote_pid = 0;
-	bpf_map_update_elem(map_fd[1], &idx, &remote_pid, BPF_ANY);
-
-	sync();
-	bpf_map_lookup_elem(map_fd[1], &idx, &remote_pid);
-
-	if (local_pid == remote_pid) {
-		fprintf(stderr, "BPF cgroup negative test did not work\n");
-		goto err;
-	}
-
-	rc = 0;
-
-err:
-	if (cg2 != -1)
-		close(cg2);
-
-	cleanup_cgroup_environment();
-
-cleanup:
-	bpf_link__destroy(link);
-	bpf_object__close(obj);
-	return rc;
-}