This is xnu-11215.1.10. See this file in:
#include <errno.h>
#include <stdlib.h>
#include <libgen.h>
#include <limits.h>
#include <mach-o/dyld.h>
#include <sys/types.h>
#include <sys/sysctl.h>
#include <xlocale.h>
#include <darwintest.h>
#include <darwintest_utils.h>
#include "drop_priv.h"
#include "test_utils.h"
#if ENTITLED
#define SET_TREATMENT_ID set_treatment_id_entitled
#define SET_TREATMENT_ID_DESCR "Can set treatment id with entitlement"
#else /* ENTITLED */
#define SET_TREATMENT_ID set_treatment_id_unentitled
#define SET_TREATMENT_ID_DESCR "Can't set treatment id without entitlement"
#endif /* ENTITLED */
T_DECL(SET_TREATMENT_ID, "Verifies that EXPERIMENT sysctls can only be set with the entitlement", T_META_ASROOT(false))
{
#define TEST_STR "testing"
#define IDENTIFIER_LENGTH 36
int ret;
errno_t err;
char val[IDENTIFIER_LENGTH + 1] = {0};
size_t len = sizeof(val);
char new_val[IDENTIFIER_LENGTH + 1] = {0};
if (!is_development_kernel()) {
T_SKIP("skipping test on release kernel");
}
strlcpy(new_val, TEST_STR, sizeof(new_val));
if (running_as_root()) {
drop_priv();
}
ret = sysctlbyname("kern.trial_treatment_id", val, &len, new_val, strlen(new_val));
err = errno;
#if ENTITLED
len = sizeof(val);
memset(new_val, 0, sizeof(new_val));
T_ASSERT_POSIX_SUCCESS(ret, "set kern.trial_treatment_id");
/* Cleanup. Set it back to the empty string. */
ret = sysctlbyname("kern.trial_treatment_id", val, &len, new_val, 1);
T_QUIET; T_ASSERT_POSIX_SUCCESS(ret, "reset kern.trial_treatment_id");
#else
T_ASSERT_POSIX_FAILURE(ret, EPERM, "set kern.trial_treatment_id");
#endif /* ENTITLED */
}
#if ENTITLED
/* Check min and max value limits on numeric factors */
T_DECL(experiment_factor_numeric_limits,
"Can only set factors within the legal range.",
T_META_ASROOT(false))
{
#define kMinVal 5 /* The min value allowed for the testing factor. */
#define kMaxVal 10 /* The max value allowed for the testing factor. */
errno_t err;
int ret;
unsigned int current_val;
size_t len = sizeof(current_val);
unsigned int new_val;
if (running_as_root()) {
drop_priv();
}
new_val = kMinVal - 1;
ret = sysctlbyname("kern.testing_experiment_factor", ¤t_val, &len, &new_val, sizeof(new_val));
err = errno;
T_ASSERT_POSIX_FAILURE(ret, EINVAL, "set kern.testing_experiment_factor below range.");
new_val = kMaxVal + 1;
ret = sysctlbyname("kern.testing_experiment_factor", ¤t_val, &len, &new_val, sizeof(new_val));
err = errno;
T_ASSERT_POSIX_FAILURE(ret, EINVAL, "set kern.testing_experiment_factor above range.");
new_val = kMaxVal;
ret = sysctlbyname("kern.testing_experiment_factor", ¤t_val, &len, &new_val, sizeof(new_val));
T_ASSERT_POSIX_SUCCESS(ret, "set kern.testing_experiment_factor at top of range.");
new_val = kMinVal;
ret = sysctlbyname("kern.testing_experiment_factor", ¤t_val, &len, &new_val, sizeof(new_val));
T_ASSERT_POSIX_SUCCESS(ret, "set kern.testing_experiment_factor at bottom of range.");
}
static uint64_t original_libmalloc_experiment_value = 0;
static void
reset_libmalloc_experiment(void)
{
int ret = sysctlbyname("kern.libmalloc_experiments", NULL, NULL, &original_libmalloc_experiment_value, sizeof(original_libmalloc_experiment_value));
T_ASSERT_POSIX_SUCCESS(ret, "reset kern.libmalloc_experiments");
}
static void
set_libmalloc_experiment(uint64_t val)
{
T_LOG("Setting kern.libmalloc_experiments to %llu", val);
size_t len = sizeof(original_libmalloc_experiment_value);
int ret = sysctlbyname("kern.libmalloc_experiments", &original_libmalloc_experiment_value, &len, &val, sizeof(val));
T_ASSERT_POSIX_SUCCESS(ret, "set kern.libmalloc_experiments");
T_ATEND(reset_libmalloc_experiment);
}
#define PRINT_APPLE_ARRAY_TOOL "tools/print_apple_array"
/*
* Spawns a new binary and returns the contents of its apple array
* (after libsystem initialization).
*/
static char **
get_apple_array(size_t *num_array_entries, const char * filename)
{
if (filename == NULL) {
filename = PRINT_APPLE_ARRAY_TOOL;
}
int ret;
char stdout_path[MAXPATHLEN] = "apple_array.txt";
dt_resultfile(stdout_path, MAXPATHLEN);
int exit_status = 0, signum = 0;
char binary_path[MAXPATHLEN], binary_dir[MAXPATHLEN];
char *char_ret;
const static size_t kMaxNumArguments = 256;
size_t linecap = 0;
ssize_t linelen = 0;
char **apple_array;
char **line = NULL;
size_t num_lines = 0;
FILE *stdout_f = NULL;
uint32_t name_size = MAXPATHLEN;
ret = _NSGetExecutablePath(binary_path, &name_size);
T_QUIET; T_ASSERT_EQ(ret, 0, "_NSGetExecutablePath");
char_ret = dirname_r(binary_path, binary_dir);
T_QUIET; T_ASSERT_TRUE(char_ret != NULL, "dirname_r");
snprintf(binary_path, MAXPATHLEN, "%s/%s", binary_dir, filename);
char *launch_tool_args[] = {
binary_path,
NULL
};
pid_t child_pid;
ret = dt_launch_tool(&child_pid, launch_tool_args, false, stdout_path, NULL);
T_WITH_ERRNO; T_ASSERT_EQ(ret, 0, "dt_launch_tool: %s", binary_path);
ret = dt_waitpid(child_pid, &exit_status, &signum, 60 * 5);
T_ASSERT_EQ(ret, 1, "dt_waitpid");
T_QUIET; T_ASSERT_EQ(exit_status, 0, "dt_waitpid: exit_status");
T_QUIET; T_ASSERT_EQ(signum, 0, "dt_waitpid: signum");
stdout_f = fopen(stdout_path, "r");
T_WITH_ERRNO; T_ASSERT_NOTNULL(stdout_f, "open(%s)", stdout_path);
apple_array = calloc(kMaxNumArguments, sizeof(char *));
T_QUIET; T_ASSERT_NOTNULL(apple_array, "calloc: %lu\n", sizeof(char *) * kMaxNumArguments);
while (num_lines < kMaxNumArguments) {
line = &(apple_array[num_lines++]);
linecap = 0;
linelen = getline(line, &linecap, stdout_f);
if (linelen == -1) {
break;
}
}
*num_array_entries = num_lines - 1;
ret = fclose(stdout_f);
T_ASSERT_POSIX_SUCCESS(ret, "fclose(%s)", stdout_path);
return apple_array;
}
#define LIBMALLOC_EXPERIMENT_FACTORS_KEY "MallocExperiment="
#define HARDENED_RUNTIME_KEY "HardenedRuntime="
/*
* Get the value of the key in the apple array.
* Returns true iff the key is present.
*/
static bool
get_apple_array_key(char **apple_array, size_t num_array_entries, uint64_t *factors, const char *key)
{
bool found = false;
for (size_t i = 0; i < num_array_entries; i++) {
char *str = apple_array[i];
if (strstr(str, key)) {
found = true;
if (factors != NULL) {
str = strchr(str, '=');
T_ASSERT_NOTNULL(str, "skip over =");
++str;
*factors = strtoull_l(str, NULL, 16, NULL);
}
break;
}
}
return found;
}
/* libmalloc relies on these values not changing. If they change,
* you need to update the values in that project as well */
__options_decl(HR_flags_t, uint32_t, {
BrowserHostEntitlementMask = 0x01,
BrowserGPUEntitlementMask = 0x02,
BrowserNetworkEntitlementMask = 0x04,
BrowserWebContentEntitlementMask = 0x08,
});
T_DECL(libmalloc_hardened_binary_present,
"hardened binary flags show up in apple array",
T_META_ASROOT(false))
{
uint64_t apple_array_val = 0;
size_t num_array_entries = 0;
char **apple_array;
bool found = false;
/* These are the entitlements on the HR1 binary */
uint32_t mask_val = BrowserHostEntitlementMask | BrowserGPUEntitlementMask | BrowserWebContentEntitlementMask;
apple_array = get_apple_array(&num_array_entries, "tools/print_apple_array_HR1");
found = get_apple_array_key(apple_array, num_array_entries, &apple_array_val, HARDENED_RUNTIME_KEY);
T_ASSERT_TRUE(found, "Found " HARDENED_RUNTIME_KEY " in apple array");
T_ASSERT_EQ(apple_array_val, mask_val, "Bitmask value matches");
/* These are the entitlements on the HR2 binary */
mask_val = BrowserGPUEntitlementMask | BrowserNetworkEntitlementMask;
apple_array = get_apple_array(&num_array_entries, "tools/print_apple_array_HR2");
found = get_apple_array_key(apple_array, num_array_entries, &apple_array_val, HARDENED_RUNTIME_KEY);
T_ASSERT_TRUE(found, "Found " HARDENED_RUNTIME_KEY " in apple array");
T_ASSERT_EQ(apple_array_val, mask_val, "Bitmask value matches");
free(apple_array);
}
T_DECL(libmalloc_hardened_binary_absent,
"hardened binary flags do not show up in apple array for normal third party processes",
T_META_ASROOT(false))
{
uint64_t new_val, apple_array_val = 0;
size_t num_array_entries = 0;
char **apple_array;
bool found = false;
apple_array = get_apple_array(&num_array_entries, NULL); // todo apple_array_3p?
found = get_apple_array_key(apple_array, num_array_entries, &apple_array_val, HARDENED_RUNTIME_KEY);
T_ASSERT_TRUE(!found, "Did not find " HARDENED_RUNTIME_KEY " in apple array");
free(apple_array);
}
T_DECL(libmalloc_experiment,
"libmalloc experiment flags show up in apple array if we're doing an experiment",
T_META_ASROOT(false))
{
uint64_t new_val, apple_array_val = 0;
size_t num_array_entries = 0;
char **apple_array;
bool found = false;
if (running_as_root()) {
drop_priv();
}
new_val = (1ULL << 63) - 1;
set_libmalloc_experiment(new_val);
apple_array = get_apple_array(&num_array_entries, NULL);
found = get_apple_array_key(apple_array, num_array_entries, &apple_array_val, LIBMALLOC_EXPERIMENT_FACTORS_KEY);
T_ASSERT_TRUE(found, "Found " LIBMALLOC_EXPERIMENT_FACTORS_KEY " in apple array");
T_ASSERT_EQ(apple_array_val, new_val, "Experiment value matches");
free(apple_array);
}
T_DECL(libmalloc_experiment_not_in_array,
"libmalloc experiment flags do not show up in apple array if we're not doing an experiment",
T_META_ASROOT(false))
{
size_t num_array_entries = 0;
char **apple_array;
bool found = false;
if (running_as_root()) {
drop_priv();
}
set_libmalloc_experiment(0);
apple_array = get_apple_array(&num_array_entries, NULL);
found = get_apple_array_key(apple_array, num_array_entries, NULL, LIBMALLOC_EXPERIMENT_FACTORS_KEY);
T_ASSERT_TRUE(!found, "Did not find " LIBMALLOC_EXPERIMENT_FACTORS_KEY " in apple array");
free(apple_array);
}
#endif /* ENTITLED */