/*- * SPDX-License-Identifier: BSD-2-Clause * * Copyright (c) 2018, 2019 Andrew Turner * * This software was developed by SRI International and the University of * Cambridge Computer Laboratory under DARPA/AFRL contract FA8750-10-C-0237 * ("CTSRD"), as part of the DARPA CRASH research programme. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include #include #include #include #include #include #include #include #include #include static const char *modes[] = { "PC tracing", "comparison tracing", }; static size_t page_size; static void init_page_size(void) { page_size = getpagesize(); } static int open_kcov(void) { int fd; fd = open("/dev/kcov", O_RDWR); if (fd == -1) atf_tc_skip("Failed to open /dev/kcov"); return (fd); } ATF_TC(kcov_bufsize); ATF_TC_HEAD(kcov_bufsize, tc) { init_page_size(); } ATF_TC_BODY(kcov_bufsize, tc) { int fd; fd = open_kcov(); ATF_CHECK(ioctl(fd, KIOSETBUFSIZE, 0) == -1); ATF_CHECK(ioctl(fd, KIOSETBUFSIZE, 1) == -1); ATF_CHECK(ioctl(fd, KIOSETBUFSIZE, 2) == 0); ATF_CHECK(ioctl(fd, KIOSETBUFSIZE, 2) == -1); close(fd); } ATF_TC(kcov_mmap); ATF_TC_HEAD(kcov_mmap, tc) { init_page_size(); } ATF_TC_BODY(kcov_mmap, tc) { void *data1, *data2; int fd; fd = open_kcov(); ATF_CHECK(mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0) == MAP_FAILED); ATF_REQUIRE(ioctl(fd, KIOSETBUFSIZE, 2 * page_size / KCOV_ENTRY_SIZE) == 0); ATF_CHECK(mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0) == MAP_FAILED); ATF_CHECK(mmap(NULL, 3 * page_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0) == MAP_FAILED); ATF_REQUIRE((data1 = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) != MAP_FAILED); ATF_REQUIRE((data2 = mmap(NULL, 2 * page_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0)) != MAP_FAILED); *(uint64_t *)data1 = 0x123456789abcdeful; ATF_REQUIRE(*(uint64_t *)data2 == 0x123456789abcdefull); *(uint64_t *)data2 = 0xfedcba9876543210ul; ATF_REQUIRE(*(uint64_t *)data1 == 0xfedcba9876543210ull); munmap(data1, 2 * page_size); munmap(data2, 2 * page_size); close(fd); } /* This shouldn't panic */ ATF_TC(kcov_mmap_no_munmap); ATF_TC_HEAD(kcov_mmap_no_munmap, tc) { init_page_size(); } ATF_TC_BODY(kcov_mmap_no_munmap, tc) { int fd; fd = open_kcov(); ATF_REQUIRE(ioctl(fd, KIOSETBUFSIZE, page_size / KCOV_ENTRY_SIZE) == 0); ATF_CHECK(mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0) != MAP_FAILED); close(fd); } ATF_TC(kcov_mmap_no_munmap_no_close); ATF_TC_HEAD(kcov_mmap_no_munmap_no_close, tc) { init_page_size(); } ATF_TC_BODY(kcov_mmap_no_munmap_no_close, tc) { int fd; fd = open_kcov(); ATF_REQUIRE(ioctl(fd, KIOSETBUFSIZE, page_size / KCOV_ENTRY_SIZE) == 0); ATF_CHECK(mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0) != MAP_FAILED); } static sem_t sem1, sem2; static void * kcov_mmap_enable_thread(void *data) { int fd; fd = open_kcov(); *(int *)data = fd; ATF_REQUIRE(ioctl(fd, KIOSETBUFSIZE, page_size / KCOV_ENTRY_SIZE) == 0); ATF_CHECK(mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0) != MAP_FAILED); ATF_CHECK(ioctl(fd, KIOENABLE, KCOV_MODE_TRACE_PC) == 0); sem_post(&sem1); sem_wait(&sem2); return (NULL); } ATF_TC(kcov_mmap_enable_thread_close); ATF_TC_HEAD(kcov_mmap_enable_thread_close, tc) { init_page_size(); } ATF_TC_BODY(kcov_mmap_enable_thread_close, tc) { pthread_t thread; int fd; sem_init(&sem1, 0, 0); sem_init(&sem2, 0, 0); pthread_create(&thread, NULL, kcov_mmap_enable_thread, &fd); sem_wait(&sem1); close(fd); sem_post(&sem2); pthread_join(thread, NULL); } ATF_TC(kcov_enable); ATF_TC_HEAD(kcov_enable, tc) { init_page_size(); } ATF_TC_BODY(kcov_enable, tc) { int fd; fd = open_kcov(); ATF_CHECK(ioctl(fd, KIOENABLE, KCOV_MODE_TRACE_PC) == -1); ATF_REQUIRE(ioctl(fd, KIOSETBUFSIZE, page_size / KCOV_ENTRY_SIZE) == 0); /* We need to enable before disable */ ATF_CHECK(ioctl(fd, KIODISABLE, 0) == -1); /* Check enabling works only with a valid trace method */ ATF_CHECK(ioctl(fd, KIOENABLE, -1) == -1); ATF_CHECK(ioctl(fd, KIOENABLE, KCOV_MODE_TRACE_PC) == 0); ATF_CHECK(ioctl(fd, KIOENABLE, KCOV_MODE_TRACE_PC) == -1); ATF_CHECK(ioctl(fd, KIOENABLE, KCOV_MODE_TRACE_CMP) == -1); /* Disable should only be called once */ ATF_CHECK(ioctl(fd, KIODISABLE, 0) == 0); ATF_CHECK(ioctl(fd, KIODISABLE, 0) == -1); /* Re-enabling should also work */ ATF_CHECK(ioctl(fd, KIOENABLE, KCOV_MODE_TRACE_CMP) == 0); ATF_CHECK(ioctl(fd, KIODISABLE, 0) == 0); close(fd); } ATF_TC(kcov_enable_no_disable); ATF_TC_HEAD(kcov_enable_no_disable, tc) { init_page_size(); } ATF_TC_BODY(kcov_enable_no_disable, tc) { int fd; fd = open_kcov(); ATF_REQUIRE(ioctl(fd, KIOSETBUFSIZE, page_size / KCOV_ENTRY_SIZE) == 0); ATF_CHECK(ioctl(fd, KIOENABLE, KCOV_MODE_TRACE_PC) == 0); close(fd); } ATF_TC(kcov_enable_no_disable_no_close); ATF_TC_HEAD(kcov_enable_no_disable_no_close, tc) { init_page_size(); } ATF_TC_BODY(kcov_enable_no_disable_no_close, tc) { int fd; fd = open_kcov(); ATF_REQUIRE(ioctl(fd, KIOSETBUFSIZE, page_size / KCOV_ENTRY_SIZE) == 0); ATF_CHECK(ioctl(fd, KIOENABLE, KCOV_MODE_TRACE_PC) == 0); } static void * common_head(int *fdp) { void *data; int fd; fd = open_kcov(); ATF_REQUIRE_MSG(ioctl(fd, KIOSETBUFSIZE, page_size / KCOV_ENTRY_SIZE) == 0, "Unable to set the kcov buffer size"); data = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); ATF_REQUIRE_MSG(data != MAP_FAILED, "Unable to mmap the kcov buffer"); *fdp = fd; return (data); } static void common_tail(int fd, void *data) { ATF_REQUIRE_MSG(munmap(data, page_size) == 0, "Unable to unmap the kcov buffer"); close(fd); } static void basic_test(u_int mode) { uint64_t *buf; int fd; buf = common_head(&fd); ATF_REQUIRE_MSG(ioctl(fd, KIOENABLE, mode) == 0, "Unable to enable kcov %s", mode < nitems(modes) ? modes[mode] : "unknown mode"); atomic_store_64(&buf[0], 0); sleep(0); ATF_REQUIRE_MSG(atomic_load_64(&buf[0]) != 0, "No records found"); ATF_REQUIRE_MSG(ioctl(fd, KIODISABLE, 0) == 0, "Unable to disable kcov"); common_tail(fd, buf); } ATF_TC(kcov_basic_pc); ATF_TC_HEAD(kcov_basic_pc, tc) { init_page_size(); } ATF_TC_BODY(kcov_basic_pc, tc) { basic_test(KCOV_MODE_TRACE_PC); } ATF_TC(kcov_basic_cmp); ATF_TC_HEAD(kcov_basic_cmp, tc) { init_page_size(); } ATF_TC_BODY(kcov_basic_cmp, tc) { basic_test(KCOV_MODE_TRACE_CMP); } static void * thread_test_helper(void *ptr) { uint64_t *buf = ptr; atomic_store_64(&buf[0], 0); sleep(0); ATF_REQUIRE_MSG(atomic_load_64(&buf[0]) == 0, "Records changed in blocked thread"); return (NULL); } static void thread_test(u_int mode) { pthread_t thread; uint64_t *buf; int fd; buf = common_head(&fd); ATF_REQUIRE_MSG(ioctl(fd, KIOENABLE, mode) == 0, "Unable to enable kcov %s", mode < nitems(modes) ? modes[mode] : "unknown mode"); pthread_create(&thread, NULL, thread_test_helper, buf); pthread_join(thread, NULL); ATF_REQUIRE_MSG(ioctl(fd, KIODISABLE, 0) == 0, "Unable to disable kcov"); common_tail(fd, buf); } ATF_TC(kcov_thread_pc); ATF_TC_HEAD(kcov_thread_pc, tc) { init_page_size(); } ATF_TC_BODY(kcov_thread_pc, tc) { thread_test(KCOV_MODE_TRACE_PC); } ATF_TC(kcov_thread_cmp); ATF_TC_HEAD(kcov_thread_cmp, tc) { init_page_size(); } ATF_TC_BODY(kcov_thread_cmp, tc) { thread_test(KCOV_MODE_TRACE_CMP); } struct multi_thread_data { uint64_t *buf; int fd; u_int mode; int thread; }; static void * multi_thread_test_helper(void *ptr) { struct multi_thread_data *data = ptr; ATF_REQUIRE_MSG(ioctl(data->fd, KIOENABLE, data->mode) == 0, "Unable to enable kcov %s in thread %d", data->mode < nitems(modes) ? modes[data->mode] : "unknown mode", data->thread); atomic_store_64(&data->buf[0], 0); sleep(0); ATF_REQUIRE_MSG(atomic_load_64(&data->buf[0]) != 0, "No records found in thread %d", data->thread); return (NULL); } ATF_TC(kcov_enable_multi_thread); ATF_TC_HEAD(kcov_enable_multi_thread, t) { init_page_size(); } ATF_TC_BODY(kcov_enable_multi_thread, t) { struct multi_thread_data data; pthread_t thread; data.buf = common_head(&data.fd); /* Run the thread to completion */ data.thread = 1; data.mode = KCOV_MODE_TRACE_PC; pthread_create(&thread, NULL, multi_thread_test_helper, &data); pthread_join(thread, NULL); /* Run it again to check enable works on the same fd */ data.thread = 2; data.mode = KCOV_MODE_TRACE_CMP; pthread_create(&thread, NULL, multi_thread_test_helper, &data); pthread_join(thread, NULL); common_tail(data.fd, data.buf); } ATF_TP_ADD_TCS(tp) { ATF_TP_ADD_TC(tp, kcov_bufsize); ATF_TP_ADD_TC(tp, kcov_mmap); ATF_TP_ADD_TC(tp, kcov_mmap_no_munmap); ATF_TP_ADD_TC(tp, kcov_mmap_no_munmap_no_close); ATF_TP_ADD_TC(tp, kcov_enable); ATF_TP_ADD_TC(tp, kcov_enable_no_disable); ATF_TP_ADD_TC(tp, kcov_enable_no_disable_no_close); ATF_TP_ADD_TC(tp, kcov_mmap_enable_thread_close); ATF_TP_ADD_TC(tp, kcov_basic_pc); ATF_TP_ADD_TC(tp, kcov_basic_cmp); ATF_TP_ADD_TC(tp, kcov_thread_pc); ATF_TP_ADD_TC(tp, kcov_thread_cmp); ATF_TP_ADD_TC(tp, kcov_enable_multi_thread); return (atf_no_error()); }