581 lines
15 KiB
C
581 lines
15 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2021-2022, NVIDIA CORPORATION & AFFILIATES
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*
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* These tests are "kernel integrity" tests. They are looking for kernel
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* WARN/OOPS/kasn/etc splats triggered by kernel sanitizers & debugging
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* features. It does not attempt to verify that the system calls are doing what
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* they are supposed to do.
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*
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* The basic philosophy is to run a sequence of calls that will succeed and then
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* sweep every failure injection point on that call chain to look for
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* interesting things in error handling.
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*
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* This test is best run with:
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* echo 1 > /proc/sys/kernel/panic_on_warn
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* If something is actually going wrong.
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*/
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#include <fcntl.h>
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#include <dirent.h>
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#define __EXPORTED_HEADERS__
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#include <linux/vfio.h>
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#include "iommufd_utils.h"
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static bool have_fault_injection;
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static int writeat(int dfd, const char *fn, const char *val)
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{
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size_t val_len = strlen(val);
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ssize_t res;
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int fd;
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fd = openat(dfd, fn, O_WRONLY);
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if (fd == -1)
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return -1;
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res = write(fd, val, val_len);
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assert(res == val_len);
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close(fd);
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return 0;
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}
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static __attribute__((constructor)) void setup_buffer(void)
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{
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BUFFER_SIZE = 2*1024*1024;
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buffer = mmap(0, BUFFER_SIZE, PROT_READ | PROT_WRITE,
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MAP_SHARED | MAP_ANONYMOUS, -1, 0);
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}
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/*
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* This sets up fail_injection in a way that is useful for this test.
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* It does not attempt to restore things back to how they were.
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*/
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static __attribute__((constructor)) void setup_fault_injection(void)
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{
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DIR *debugfs = opendir("/sys/kernel/debug/");
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struct dirent *dent;
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if (!debugfs)
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return;
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/* Allow any allocation call to be fault injected */
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if (writeat(dirfd(debugfs), "failslab/ignore-gfp-wait", "N"))
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return;
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writeat(dirfd(debugfs), "fail_page_alloc/ignore-gfp-wait", "N");
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writeat(dirfd(debugfs), "fail_page_alloc/ignore-gfp-highmem", "N");
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while ((dent = readdir(debugfs))) {
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char fn[300];
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if (strncmp(dent->d_name, "fail", 4) != 0)
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continue;
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/* We are looking for kernel splats, quiet down the log */
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snprintf(fn, sizeof(fn), "%s/verbose", dent->d_name);
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writeat(dirfd(debugfs), fn, "0");
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}
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closedir(debugfs);
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have_fault_injection = true;
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}
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struct fail_nth_state {
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int proc_fd;
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unsigned int iteration;
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};
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static void fail_nth_first(struct __test_metadata *_metadata,
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struct fail_nth_state *nth_state)
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{
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char buf[300];
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snprintf(buf, sizeof(buf), "/proc/self/task/%u/fail-nth", getpid());
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nth_state->proc_fd = open(buf, O_RDWR);
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ASSERT_NE(-1, nth_state->proc_fd);
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}
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static bool fail_nth_next(struct __test_metadata *_metadata,
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struct fail_nth_state *nth_state,
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int test_result)
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{
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static const char disable_nth[] = "0";
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char buf[300];
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/*
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* This is just an arbitrary limit based on the current kernel
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* situation. Changes in the kernel can dramtically change the number of
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* required fault injection sites, so if this hits it doesn't
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* necessarily mean a test failure, just that the limit has to be made
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* bigger.
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*/
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ASSERT_GT(400, nth_state->iteration);
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if (nth_state->iteration != 0) {
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ssize_t res;
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ssize_t res2;
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buf[0] = 0;
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/*
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* Annoyingly disabling the nth can also fail. This means
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* the test passed without triggering failure
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*/
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res = pread(nth_state->proc_fd, buf, sizeof(buf), 0);
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if (res == -1 && errno == EFAULT) {
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buf[0] = '1';
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buf[1] = '\n';
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res = 2;
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}
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res2 = pwrite(nth_state->proc_fd, disable_nth,
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ARRAY_SIZE(disable_nth) - 1, 0);
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if (res2 == -1 && errno == EFAULT) {
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res2 = pwrite(nth_state->proc_fd, disable_nth,
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ARRAY_SIZE(disable_nth) - 1, 0);
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buf[0] = '1';
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buf[1] = '\n';
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}
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ASSERT_EQ(ARRAY_SIZE(disable_nth) - 1, res2);
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/* printf(" nth %u result=%d nth=%u\n", nth_state->iteration,
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test_result, atoi(buf)); */
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fflush(stdout);
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ASSERT_LT(1, res);
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if (res != 2 || buf[0] != '0' || buf[1] != '\n')
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return false;
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} else {
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/* printf(" nth %u result=%d\n", nth_state->iteration,
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test_result); */
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}
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nth_state->iteration++;
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return true;
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}
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/*
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* This is called during the test to start failure injection. It allows the test
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* to do some setup that has already been swept and thus reduce the required
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* iterations.
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*/
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void __fail_nth_enable(struct __test_metadata *_metadata,
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struct fail_nth_state *nth_state)
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{
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char buf[300];
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size_t len;
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if (!nth_state->iteration)
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return;
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len = snprintf(buf, sizeof(buf), "%u", nth_state->iteration);
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ASSERT_EQ(len, pwrite(nth_state->proc_fd, buf, len, 0));
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}
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#define fail_nth_enable() __fail_nth_enable(_metadata, _nth_state)
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#define TEST_FAIL_NTH(fixture_name, name) \
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static int test_nth_##name(struct __test_metadata *_metadata, \
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FIXTURE_DATA(fixture_name) *self, \
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const FIXTURE_VARIANT(fixture_name) \
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*variant, \
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struct fail_nth_state *_nth_state); \
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TEST_F(fixture_name, name) \
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{ \
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struct fail_nth_state nth_state = {}; \
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int test_result = 0; \
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\
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if (!have_fault_injection) \
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SKIP(return, \
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"fault injection is not enabled in the kernel"); \
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fail_nth_first(_metadata, &nth_state); \
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ASSERT_EQ(0, test_nth_##name(_metadata, self, variant, \
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&nth_state)); \
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while (fail_nth_next(_metadata, &nth_state, test_result)) { \
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fixture_name##_teardown(_metadata, self, variant); \
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fixture_name##_setup(_metadata, self, variant); \
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test_result = test_nth_##name(_metadata, self, \
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variant, &nth_state); \
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}; \
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ASSERT_EQ(0, test_result); \
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} \
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static int test_nth_##name( \
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struct __test_metadata __attribute__((unused)) *_metadata, \
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FIXTURE_DATA(fixture_name) __attribute__((unused)) *self, \
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const FIXTURE_VARIANT(fixture_name) __attribute__((unused)) \
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*variant, \
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struct fail_nth_state *_nth_state)
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FIXTURE(basic_fail_nth)
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{
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int fd;
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uint32_t access_id;
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};
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FIXTURE_SETUP(basic_fail_nth)
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{
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self->fd = -1;
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self->access_id = 0;
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}
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FIXTURE_TEARDOWN(basic_fail_nth)
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{
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int rc;
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if (self->access_id) {
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/* The access FD holds the iommufd open until it closes */
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rc = _test_cmd_destroy_access(self->access_id);
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assert(rc == 0);
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}
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teardown_iommufd(self->fd, _metadata);
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}
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/* Cover ioas.c */
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TEST_FAIL_NTH(basic_fail_nth, basic)
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{
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struct iommu_iova_range ranges[10];
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uint32_t ioas_id;
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__u64 iova;
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fail_nth_enable();
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self->fd = open("/dev/iommu", O_RDWR);
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if (self->fd == -1)
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return -1;
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if (_test_ioctl_ioas_alloc(self->fd, &ioas_id))
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return -1;
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{
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struct iommu_ioas_iova_ranges ranges_cmd = {
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.size = sizeof(ranges_cmd),
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.num_iovas = ARRAY_SIZE(ranges),
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.ioas_id = ioas_id,
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.allowed_iovas = (uintptr_t)ranges,
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};
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if (ioctl(self->fd, IOMMU_IOAS_IOVA_RANGES, &ranges_cmd))
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return -1;
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}
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{
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struct iommu_ioas_allow_iovas allow_cmd = {
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.size = sizeof(allow_cmd),
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.ioas_id = ioas_id,
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.num_iovas = 1,
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.allowed_iovas = (uintptr_t)ranges,
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};
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ranges[0].start = 16*1024;
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ranges[0].last = BUFFER_SIZE + 16 * 1024 * 600 - 1;
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if (ioctl(self->fd, IOMMU_IOAS_ALLOW_IOVAS, &allow_cmd))
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return -1;
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}
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if (_test_ioctl_ioas_map(self->fd, ioas_id, buffer, BUFFER_SIZE, &iova,
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IOMMU_IOAS_MAP_WRITEABLE |
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IOMMU_IOAS_MAP_READABLE))
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return -1;
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{
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struct iommu_ioas_copy copy_cmd = {
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.size = sizeof(copy_cmd),
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.flags = IOMMU_IOAS_MAP_WRITEABLE |
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IOMMU_IOAS_MAP_READABLE,
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.dst_ioas_id = ioas_id,
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.src_ioas_id = ioas_id,
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.src_iova = iova,
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.length = sizeof(ranges),
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};
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if (ioctl(self->fd, IOMMU_IOAS_COPY, ©_cmd))
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return -1;
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}
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if (_test_ioctl_ioas_unmap(self->fd, ioas_id, iova, BUFFER_SIZE,
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NULL))
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return -1;
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/* Failure path of no IOVA to unmap */
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_test_ioctl_ioas_unmap(self->fd, ioas_id, iova, BUFFER_SIZE, NULL);
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return 0;
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}
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/* iopt_area_fill_domains() and iopt_area_fill_domain() */
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TEST_FAIL_NTH(basic_fail_nth, map_domain)
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{
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uint32_t ioas_id;
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__u32 device_id;
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__u32 hwpt_id;
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__u64 iova;
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self->fd = open("/dev/iommu", O_RDWR);
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if (self->fd == -1)
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return -1;
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if (_test_ioctl_ioas_alloc(self->fd, &ioas_id))
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return -1;
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if (_test_ioctl_set_temp_memory_limit(self->fd, 32))
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return -1;
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fail_nth_enable();
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if (_test_cmd_mock_domain(self->fd, ioas_id, &device_id, &hwpt_id))
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return -1;
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if (_test_ioctl_ioas_map(self->fd, ioas_id, buffer, 262144, &iova,
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IOMMU_IOAS_MAP_WRITEABLE |
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IOMMU_IOAS_MAP_READABLE))
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return -1;
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if (_test_ioctl_destroy(self->fd, device_id))
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return -1;
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if (_test_ioctl_destroy(self->fd, hwpt_id))
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return -1;
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if (_test_cmd_mock_domain(self->fd, ioas_id, &device_id, &hwpt_id))
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return -1;
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return 0;
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}
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TEST_FAIL_NTH(basic_fail_nth, map_two_domains)
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{
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uint32_t ioas_id;
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__u32 device_id2;
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__u32 device_id;
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__u32 hwpt_id2;
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__u32 hwpt_id;
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__u64 iova;
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self->fd = open("/dev/iommu", O_RDWR);
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if (self->fd == -1)
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return -1;
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if (_test_ioctl_ioas_alloc(self->fd, &ioas_id))
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return -1;
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if (_test_ioctl_set_temp_memory_limit(self->fd, 32))
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return -1;
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if (_test_cmd_mock_domain(self->fd, ioas_id, &device_id, &hwpt_id))
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return -1;
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fail_nth_enable();
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if (_test_cmd_mock_domain(self->fd, ioas_id, &device_id2, &hwpt_id2))
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return -1;
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if (_test_ioctl_ioas_map(self->fd, ioas_id, buffer, 262144, &iova,
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IOMMU_IOAS_MAP_WRITEABLE |
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IOMMU_IOAS_MAP_READABLE))
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return -1;
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if (_test_ioctl_destroy(self->fd, device_id))
|
||
|
|
return -1;
|
||
|
|
if (_test_ioctl_destroy(self->fd, hwpt_id))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (_test_ioctl_destroy(self->fd, device_id2))
|
||
|
|
return -1;
|
||
|
|
if (_test_ioctl_destroy(self->fd, hwpt_id2))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (_test_cmd_mock_domain(self->fd, ioas_id, &device_id, &hwpt_id))
|
||
|
|
return -1;
|
||
|
|
if (_test_cmd_mock_domain(self->fd, ioas_id, &device_id2, &hwpt_id2))
|
||
|
|
return -1;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
TEST_FAIL_NTH(basic_fail_nth, access_rw)
|
||
|
|
{
|
||
|
|
uint64_t tmp_big[4096];
|
||
|
|
uint32_t ioas_id;
|
||
|
|
uint16_t tmp[32];
|
||
|
|
__u64 iova;
|
||
|
|
|
||
|
|
self->fd = open("/dev/iommu", O_RDWR);
|
||
|
|
if (self->fd == -1)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (_test_ioctl_ioas_alloc(self->fd, &ioas_id))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (_test_ioctl_set_temp_memory_limit(self->fd, 32))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (_test_ioctl_ioas_map(self->fd, ioas_id, buffer, 262144, &iova,
|
||
|
|
IOMMU_IOAS_MAP_WRITEABLE |
|
||
|
|
IOMMU_IOAS_MAP_READABLE))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
fail_nth_enable();
|
||
|
|
|
||
|
|
if (_test_cmd_create_access(self->fd, ioas_id, &self->access_id, 0))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
{
|
||
|
|
struct iommu_test_cmd access_cmd = {
|
||
|
|
.size = sizeof(access_cmd),
|
||
|
|
.op = IOMMU_TEST_OP_ACCESS_RW,
|
||
|
|
.id = self->access_id,
|
||
|
|
.access_rw = { .iova = iova,
|
||
|
|
.length = sizeof(tmp),
|
||
|
|
.uptr = (uintptr_t)tmp },
|
||
|
|
};
|
||
|
|
|
||
|
|
// READ
|
||
|
|
if (ioctl(self->fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_ACCESS_RW),
|
||
|
|
&access_cmd))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
access_cmd.access_rw.flags = MOCK_ACCESS_RW_WRITE;
|
||
|
|
if (ioctl(self->fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_ACCESS_RW),
|
||
|
|
&access_cmd))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
access_cmd.access_rw.flags = MOCK_ACCESS_RW_SLOW_PATH;
|
||
|
|
if (ioctl(self->fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_ACCESS_RW),
|
||
|
|
&access_cmd))
|
||
|
|
return -1;
|
||
|
|
access_cmd.access_rw.flags = MOCK_ACCESS_RW_SLOW_PATH |
|
||
|
|
MOCK_ACCESS_RW_WRITE;
|
||
|
|
if (ioctl(self->fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_ACCESS_RW),
|
||
|
|
&access_cmd))
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
{
|
||
|
|
struct iommu_test_cmd access_cmd = {
|
||
|
|
.size = sizeof(access_cmd),
|
||
|
|
.op = IOMMU_TEST_OP_ACCESS_RW,
|
||
|
|
.id = self->access_id,
|
||
|
|
.access_rw = { .iova = iova,
|
||
|
|
.flags = MOCK_ACCESS_RW_SLOW_PATH,
|
||
|
|
.length = sizeof(tmp_big),
|
||
|
|
.uptr = (uintptr_t)tmp_big },
|
||
|
|
};
|
||
|
|
|
||
|
|
if (ioctl(self->fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_ACCESS_RW),
|
||
|
|
&access_cmd))
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
if (_test_cmd_destroy_access(self->access_id))
|
||
|
|
return -1;
|
||
|
|
self->access_id = 0;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* pages.c access functions */
|
||
|
|
TEST_FAIL_NTH(basic_fail_nth, access_pin)
|
||
|
|
{
|
||
|
|
uint32_t access_pages_id;
|
||
|
|
uint32_t ioas_id;
|
||
|
|
__u64 iova;
|
||
|
|
|
||
|
|
self->fd = open("/dev/iommu", O_RDWR);
|
||
|
|
if (self->fd == -1)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (_test_ioctl_ioas_alloc(self->fd, &ioas_id))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (_test_ioctl_set_temp_memory_limit(self->fd, 32))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (_test_ioctl_ioas_map(self->fd, ioas_id, buffer, BUFFER_SIZE, &iova,
|
||
|
|
IOMMU_IOAS_MAP_WRITEABLE |
|
||
|
|
IOMMU_IOAS_MAP_READABLE))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (_test_cmd_create_access(self->fd, ioas_id, &self->access_id,
|
||
|
|
MOCK_FLAGS_ACCESS_CREATE_NEEDS_PIN_PAGES))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
fail_nth_enable();
|
||
|
|
|
||
|
|
{
|
||
|
|
struct iommu_test_cmd access_cmd = {
|
||
|
|
.size = sizeof(access_cmd),
|
||
|
|
.op = IOMMU_TEST_OP_ACCESS_PAGES,
|
||
|
|
.id = self->access_id,
|
||
|
|
.access_pages = { .iova = iova,
|
||
|
|
.length = BUFFER_SIZE,
|
||
|
|
.uptr = (uintptr_t)buffer },
|
||
|
|
};
|
||
|
|
|
||
|
|
if (ioctl(self->fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_ACCESS_RW),
|
||
|
|
&access_cmd))
|
||
|
|
return -1;
|
||
|
|
access_pages_id = access_cmd.access_pages.out_access_pages_id;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (_test_cmd_destroy_access_pages(self->fd, self->access_id,
|
||
|
|
access_pages_id))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (_test_cmd_destroy_access(self->access_id))
|
||
|
|
return -1;
|
||
|
|
self->access_id = 0;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* iopt_pages_fill_xarray() */
|
||
|
|
TEST_FAIL_NTH(basic_fail_nth, access_pin_domain)
|
||
|
|
{
|
||
|
|
uint32_t access_pages_id;
|
||
|
|
uint32_t ioas_id;
|
||
|
|
__u32 device_id;
|
||
|
|
__u32 hwpt_id;
|
||
|
|
__u64 iova;
|
||
|
|
|
||
|
|
self->fd = open("/dev/iommu", O_RDWR);
|
||
|
|
if (self->fd == -1)
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (_test_ioctl_ioas_alloc(self->fd, &ioas_id))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (_test_ioctl_set_temp_memory_limit(self->fd, 32))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (_test_cmd_mock_domain(self->fd, ioas_id, &device_id, &hwpt_id))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (_test_ioctl_ioas_map(self->fd, ioas_id, buffer, BUFFER_SIZE, &iova,
|
||
|
|
IOMMU_IOAS_MAP_WRITEABLE |
|
||
|
|
IOMMU_IOAS_MAP_READABLE))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (_test_cmd_create_access(self->fd, ioas_id, &self->access_id,
|
||
|
|
MOCK_FLAGS_ACCESS_CREATE_NEEDS_PIN_PAGES))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
fail_nth_enable();
|
||
|
|
|
||
|
|
{
|
||
|
|
struct iommu_test_cmd access_cmd = {
|
||
|
|
.size = sizeof(access_cmd),
|
||
|
|
.op = IOMMU_TEST_OP_ACCESS_PAGES,
|
||
|
|
.id = self->access_id,
|
||
|
|
.access_pages = { .iova = iova,
|
||
|
|
.length = BUFFER_SIZE,
|
||
|
|
.uptr = (uintptr_t)buffer },
|
||
|
|
};
|
||
|
|
|
||
|
|
if (ioctl(self->fd, _IOMMU_TEST_CMD(IOMMU_TEST_OP_ACCESS_RW),
|
||
|
|
&access_cmd))
|
||
|
|
return -1;
|
||
|
|
access_pages_id = access_cmd.access_pages.out_access_pages_id;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (_test_cmd_destroy_access_pages(self->fd, self->access_id,
|
||
|
|
access_pages_id))
|
||
|
|
return -1;
|
||
|
|
|
||
|
|
if (_test_cmd_destroy_access(self->access_id))
|
||
|
|
return -1;
|
||
|
|
self->access_id = 0;
|
||
|
|
|
||
|
|
if (_test_ioctl_destroy(self->fd, device_id))
|
||
|
|
return -1;
|
||
|
|
if (_test_ioctl_destroy(self->fd, hwpt_id))
|
||
|
|
return -1;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
TEST_HARNESS_MAIN
|