118 lines
2.7 KiB
C
118 lines
2.7 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2025 Meta Platforms, Inc. and affiliates. */
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#include <test_progs.h>
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#include <network_helpers.h>
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#include "file_reader.skel.h"
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#include "file_reader_fail.skel.h"
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#include <dlfcn.h>
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#include <sys/mman.h>
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const char *user_ptr = "hello world";
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char file_contents[256000];
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void *get_executable_base_addr(void)
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{
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Dl_info info;
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if (!dladdr((void *)&get_executable_base_addr, &info)) {
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fprintf(stderr, "dladdr failed\n");
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return NULL;
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}
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return info.dli_fbase;
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}
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static int initialize_file_contents(void)
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{
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int fd, page_sz = sysconf(_SC_PAGESIZE);
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ssize_t n = 0, cur, off;
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void *addr;
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fd = open("/proc/self/exe", O_RDONLY);
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if (!ASSERT_OK_FD(fd, "Open /proc/self/exe\n"))
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return 1;
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do {
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cur = read(fd, file_contents + n, sizeof(file_contents) - n);
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if (!ASSERT_GT(cur, 0, "read success"))
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break;
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n += cur;
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} while (n < sizeof(file_contents));
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close(fd);
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if (!ASSERT_EQ(n, sizeof(file_contents), "Read /proc/self/exe\n"))
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return 1;
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addr = get_executable_base_addr();
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if (!ASSERT_NEQ(addr, NULL, "get executable address"))
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return 1;
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/* page-align base file address */
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addr = (void *)((unsigned long)addr & ~(page_sz - 1));
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/*
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* Page out range 0..512K, use 0..256K for positive tests and
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* 256K..512K for negative tests expecting page faults
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*/
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for (off = 0; off < sizeof(file_contents) * 2; off += page_sz) {
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if (!ASSERT_OK(madvise(addr + off, page_sz, MADV_PAGEOUT),
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"madvise pageout"))
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return errno;
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}
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return 0;
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}
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static void run_test(const char *prog_name)
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{
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struct file_reader *skel;
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struct bpf_program *prog;
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int err, fd;
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err = initialize_file_contents();
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if (!ASSERT_OK(err, "initialize file contents"))
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return;
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skel = file_reader__open();
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if (!ASSERT_OK_PTR(skel, "file_reader__open"))
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return;
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bpf_object__for_each_program(prog, skel->obj) {
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bpf_program__set_autoload(prog, strcmp(bpf_program__name(prog), prog_name) == 0);
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}
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memcpy(skel->bss->user_buf, file_contents, sizeof(file_contents));
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skel->bss->pid = getpid();
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err = file_reader__load(skel);
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if (!ASSERT_OK(err, "file_reader__load"))
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goto cleanup;
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err = file_reader__attach(skel);
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if (!ASSERT_OK(err, "file_reader__attach"))
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goto cleanup;
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fd = open("/proc/self/exe", O_RDONLY);
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if (fd >= 0)
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close(fd);
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ASSERT_EQ(skel->bss->err, 0, "err");
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ASSERT_EQ(skel->bss->run_success, 1, "run_success");
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cleanup:
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file_reader__destroy(skel);
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}
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void test_file_reader(void)
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{
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if (test__start_subtest("on_open_expect_fault"))
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run_test("on_open_expect_fault");
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if (test__start_subtest("on_open_validate_file_read"))
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run_test("on_open_validate_file_read");
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if (test__start_subtest("negative"))
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RUN_TESTS(file_reader_fail);
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}
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