128 lines · c
1// SPDX-License-Identifier: GPL-2.02/* Copyright (c) 2021 Facebook */3#include <test_progs.h>4#include <sys/types.h>5#include <unistd.h>6#include "find_vma.skel.h"7#include "find_vma_fail1.skel.h"8#include "find_vma_fail2.skel.h"9 10static void test_and_reset_skel(struct find_vma *skel, int expected_find_zero_ret, bool need_test)11{12 if (need_test) {13 ASSERT_EQ(skel->bss->found_vm_exec, 1, "found_vm_exec");14 ASSERT_EQ(skel->data->find_addr_ret, 0, "find_addr_ret");15 ASSERT_EQ(skel->data->find_zero_ret, expected_find_zero_ret, "find_zero_ret");16 ASSERT_OK_PTR(strstr(skel->bss->d_iname, "test_progs"), "find_test_progs");17 }18 19 skel->bss->found_vm_exec = 0;20 skel->data->find_addr_ret = -1;21 skel->data->find_zero_ret = -1;22 skel->bss->d_iname[0] = 0;23}24 25static int open_pe(void)26{27 struct perf_event_attr attr = {0};28 int pfd;29 30 /* create perf event */31 attr.size = sizeof(attr);32 attr.type = PERF_TYPE_SOFTWARE;33 attr.config = PERF_COUNT_SW_CPU_CLOCK;34 attr.freq = 1;35 attr.sample_freq = 1000;36 pfd = syscall(__NR_perf_event_open, &attr, 0, -1, -1, PERF_FLAG_FD_CLOEXEC);37 38 return pfd >= 0 ? pfd : -errno;39}40 41static bool find_vma_pe_condition(struct find_vma *skel)42{43 return skel->bss->found_vm_exec == 0 ||44 skel->data->find_addr_ret != 0 ||45 skel->data->find_zero_ret == -1 ||46 strcmp(skel->bss->d_iname, "test_progs") != 0;47}48 49static void test_find_vma_pe(struct find_vma *skel)50{51 struct bpf_link *link = NULL;52 volatile int j = 0;53 int pfd, i;54 const int one_bn = 1000000000;55 56 pfd = open_pe();57 if (pfd < 0) {58 if (pfd == -ENOENT || pfd == -EOPNOTSUPP) {59 printf("%s:SKIP:no PERF_COUNT_HW_CPU_CYCLES\n", __func__);60 test__skip();61 goto cleanup;62 }63 if (!ASSERT_GE(pfd, 0, "perf_event_open"))64 goto cleanup;65 }66 67 link = bpf_program__attach_perf_event(skel->progs.handle_pe, pfd);68 if (!ASSERT_OK_PTR(link, "attach_perf_event"))69 goto cleanup;70 71 for (i = 0; i < one_bn && find_vma_pe_condition(skel); ++i)72 ++j;73 74 test_and_reset_skel(skel, -EBUSY /* in nmi, irq_work is busy */, i == one_bn);75cleanup:76 bpf_link__destroy(link);77 close(pfd);78}79 80static void test_find_vma_kprobe(struct find_vma *skel)81{82 int err;83 84 err = find_vma__attach(skel);85 if (!ASSERT_OK(err, "get_branch_snapshot__attach"))86 return;87 88 getpgid(skel->bss->target_pid);89 test_and_reset_skel(skel, -ENOENT /* could not find vma for ptr 0 */, true);90}91 92static void test_illegal_write_vma(void)93{94 struct find_vma_fail1 *skel;95 96 skel = find_vma_fail1__open_and_load();97 if (!ASSERT_ERR_PTR(skel, "find_vma_fail1__open_and_load"))98 find_vma_fail1__destroy(skel);99}100 101static void test_illegal_write_task(void)102{103 struct find_vma_fail2 *skel;104 105 skel = find_vma_fail2__open_and_load();106 if (!ASSERT_ERR_PTR(skel, "find_vma_fail2__open_and_load"))107 find_vma_fail2__destroy(skel);108}109 110void serial_test_find_vma(void)111{112 struct find_vma *skel;113 114 skel = find_vma__open_and_load();115 if (!ASSERT_OK_PTR(skel, "find_vma__open_and_load"))116 return;117 118 skel->bss->target_pid = getpid();119 skel->bss->addr = (__u64)(uintptr_t)test_find_vma_pe;120 121 test_find_vma_pe(skel);122 test_find_vma_kprobe(skel);123 124 find_vma__destroy(skel);125 test_illegal_write_vma();126 test_illegal_write_task();127}128