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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task_fd_query_tp.c (2294B)

      1// SPDX-License-Identifier: GPL-2.0
      2#include <test_progs.h>
      3
      4static void test_task_fd_query_tp_core(const char *probe_name,
      5				       const char *tp_name)
      6{
      7	const char *file = "./test_tracepoint.o";
      8	int err, bytes, efd, prog_fd, pmu_fd;
      9	struct perf_event_attr attr = {};
     10	__u64 probe_offset, probe_addr;
     11	__u32 len, prog_id, fd_type;
     12	struct bpf_object *obj = NULL;
     13	__u32 duration = 0;
     14	char buf[256];
     15
     16	err = bpf_prog_test_load(file, BPF_PROG_TYPE_TRACEPOINT, &obj, &prog_fd);
     17	if (CHECK(err, "bpf_prog_test_load", "err %d errno %d\n", err, errno))
     18		goto close_prog;
     19
     20	snprintf(buf, sizeof(buf),
     21		 "/sys/kernel/debug/tracing/events/%s/id", probe_name);
     22	efd = open(buf, O_RDONLY, 0);
     23	if (CHECK(efd < 0, "open", "err %d errno %d\n", efd, errno))
     24		goto close_prog;
     25	bytes = read(efd, buf, sizeof(buf));
     26	close(efd);
     27	if (CHECK(bytes <= 0 || bytes >= sizeof(buf), "read",
     28		  "bytes %d errno %d\n", bytes, errno))
     29		goto close_prog;
     30
     31	attr.config = strtol(buf, NULL, 0);
     32	attr.type = PERF_TYPE_TRACEPOINT;
     33	attr.sample_type = PERF_SAMPLE_RAW;
     34	attr.sample_period = 1;
     35	attr.wakeup_events = 1;
     36	pmu_fd = syscall(__NR_perf_event_open, &attr, -1 /* pid */,
     37			 0 /* cpu 0 */, -1 /* group id */,
     38			 0 /* flags */);
     39	if (CHECK(err, "perf_event_open", "err %d errno %d\n", err, errno))
     40		goto close_pmu;
     41
     42	err = ioctl(pmu_fd, PERF_EVENT_IOC_ENABLE, 0);
     43	if (CHECK(err, "perf_event_ioc_enable", "err %d errno %d\n", err,
     44		  errno))
     45		goto close_pmu;
     46
     47	err = ioctl(pmu_fd, PERF_EVENT_IOC_SET_BPF, prog_fd);
     48	if (CHECK(err, "perf_event_ioc_set_bpf", "err %d errno %d\n", err,
     49		  errno))
     50		goto close_pmu;
     51
     52	/* query (getpid(), pmu_fd) */
     53	len = sizeof(buf);
     54	err = bpf_task_fd_query(getpid(), pmu_fd, 0, buf, &len, &prog_id,
     55				&fd_type, &probe_offset, &probe_addr);
     56	if (CHECK(err < 0, "bpf_task_fd_query", "err %d errno %d\n", err,
     57		  errno))
     58		goto close_pmu;
     59
     60	err = (fd_type == BPF_FD_TYPE_TRACEPOINT) && !strcmp(buf, tp_name);
     61	if (CHECK(!err, "check_results", "fd_type %d tp_name %s\n",
     62		  fd_type, buf))
     63		goto close_pmu;
     64
     65close_pmu:
     66	close(pmu_fd);
     67close_prog:
     68	bpf_object__close(obj);
     69}
     70
     71void test_task_fd_query_tp(void)
     72{
     73	test_task_fd_query_tp_core("sched/sched_switch",
     74				   "sched_switch");
     75	test_task_fd_query_tp_core("syscalls/sys_enter_read",
     76				   "sys_enter_read");
     77}