cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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get_stackid_cannot_attach.c (2676B)

      1// SPDX-License-Identifier: GPL-2.0
      2// Copyright (c) 2020 Facebook
      3#include <test_progs.h>
      4#include "test_stacktrace_build_id.skel.h"
      5
      6void test_get_stackid_cannot_attach(void)
      7{
      8	struct perf_event_attr attr = {
      9		/* .type = PERF_TYPE_SOFTWARE, */
     10		.type = PERF_TYPE_HARDWARE,
     11		.config = PERF_COUNT_HW_CPU_CYCLES,
     12		.precise_ip = 1,
     13		.sample_type = PERF_SAMPLE_IP | PERF_SAMPLE_BRANCH_STACK,
     14		.branch_sample_type = PERF_SAMPLE_BRANCH_USER |
     15			PERF_SAMPLE_BRANCH_NO_FLAGS |
     16			PERF_SAMPLE_BRANCH_NO_CYCLES |
     17			PERF_SAMPLE_BRANCH_CALL_STACK,
     18		.sample_period = 5000,
     19		.size = sizeof(struct perf_event_attr),
     20	};
     21	struct test_stacktrace_build_id *skel;
     22	__u32 duration = 0;
     23	int pmu_fd, err;
     24
     25	skel = test_stacktrace_build_id__open();
     26	if (CHECK(!skel, "skel_open", "skeleton open failed\n"))
     27		return;
     28
     29	/* override program type */
     30	bpf_program__set_type(skel->progs.oncpu, BPF_PROG_TYPE_PERF_EVENT);
     31
     32	err = test_stacktrace_build_id__load(skel);
     33	if (CHECK(err, "skel_load", "skeleton load failed: %d\n", err))
     34		goto cleanup;
     35
     36	pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
     37			 0 /* cpu 0 */, -1 /* group id */,
     38			 0 /* flags */);
     39	if (pmu_fd < 0 && (errno == ENOENT || errno == EOPNOTSUPP)) {
     40		printf("%s:SKIP:cannot open PERF_COUNT_HW_CPU_CYCLES with precise_ip > 0\n",
     41		       __func__);
     42		test__skip();
     43		goto cleanup;
     44	}
     45	if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n",
     46		  pmu_fd, errno))
     47		goto cleanup;
     48
     49	skel->links.oncpu = bpf_program__attach_perf_event(skel->progs.oncpu,
     50							   pmu_fd);
     51	ASSERT_ERR_PTR(skel->links.oncpu, "attach_perf_event_no_callchain");
     52	close(pmu_fd);
     53
     54	/* add PERF_SAMPLE_CALLCHAIN, attach should succeed */
     55	attr.sample_type |= PERF_SAMPLE_CALLCHAIN;
     56
     57	pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
     58			 0 /* cpu 0 */, -1 /* group id */,
     59			 0 /* flags */);
     60
     61	if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n",
     62		  pmu_fd, errno))
     63		goto cleanup;
     64
     65	skel->links.oncpu = bpf_program__attach_perf_event(skel->progs.oncpu,
     66							   pmu_fd);
     67	ASSERT_OK_PTR(skel->links.oncpu, "attach_perf_event_callchain");
     68	close(pmu_fd);
     69
     70	/* add exclude_callchain_kernel, attach should fail */
     71	attr.exclude_callchain_kernel = 1;
     72
     73	pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
     74			 0 /* cpu 0 */, -1 /* group id */,
     75			 0 /* flags */);
     76
     77	if (CHECK(pmu_fd < 0, "perf_event_open", "err %d errno %d\n",
     78		  pmu_fd, errno))
     79		goto cleanup;
     80
     81	skel->links.oncpu = bpf_program__attach_perf_event(skel->progs.oncpu,
     82							   pmu_fd);
     83	ASSERT_ERR_PTR(skel->links.oncpu, "attach_perf_event_exclude_callchain_kernel");
     84	close(pmu_fd);
     85
     86cleanup:
     87	test_stacktrace_build_id__destroy(skel);
     88}