1*aca3beaaSApple OSS Distributions #include <darwintest.h>
2*aca3beaaSApple OSS Distributions
3*aca3beaaSApple OSS Distributions #include <mach/mach_error.h>
4*aca3beaaSApple OSS Distributions #include <mach/mach_host.h>
5*aca3beaaSApple OSS Distributions
6*aca3beaaSApple OSS Distributions #include "drop_priv.h"
7*aca3beaaSApple OSS Distributions
8*aca3beaaSApple OSS Distributions T_GLOBAL_META(T_META_NAMESPACE("xnu.debugging"));
9*aca3beaaSApple OSS Distributions
10*aca3beaaSApple OSS Distributions /*
11*aca3beaaSApple OSS Distributions * The low 8 bits may be in use, so modify one
12*aca3beaaSApple OSS Distributions * of the upper 8 bits to ensure round-tripping.
13*aca3beaaSApple OSS Distributions */
14*aca3beaaSApple OSS Distributions #define LIBTRACE_PRIVATE_DATA 0x01000000
15*aca3beaaSApple OSS Distributions
16*aca3beaaSApple OSS Distributions static bool _needs_reset;
17*aca3beaaSApple OSS Distributions static uint32_t _original;
18*aca3beaaSApple OSS Distributions
19*aca3beaaSApple OSS Distributions static uint32_t
_save_atm_diagnostic_flag(void)20*aca3beaaSApple OSS Distributions _save_atm_diagnostic_flag(void)
21*aca3beaaSApple OSS Distributions {
22*aca3beaaSApple OSS Distributions kern_return_t kr;
23*aca3beaaSApple OSS Distributions kr = host_get_atm_diagnostic_flag(mach_host_self(), &_original);
24*aca3beaaSApple OSS Distributions T_QUIET; T_ASSERT_MACH_SUCCESS(kr, "host_get_atm_diagnostic_flag()");
25*aca3beaaSApple OSS Distributions T_LOG("Original ATM diagnostic flag: 0x%08x", _original);
26*aca3beaaSApple OSS Distributions return _original;
27*aca3beaaSApple OSS Distributions }
28*aca3beaaSApple OSS Distributions
29*aca3beaaSApple OSS Distributions static kern_return_t
_mutate_atm_diagnostic_flag(uint32_t v)30*aca3beaaSApple OSS Distributions _mutate_atm_diagnostic_flag(uint32_t v)
31*aca3beaaSApple OSS Distributions {
32*aca3beaaSApple OSS Distributions T_LOG("Try to set ATM diagnostic flag to: 0x%08x", v);
33*aca3beaaSApple OSS Distributions kern_return_t kr = host_set_atm_diagnostic_flag(mach_host_self(), v);
34*aca3beaaSApple OSS Distributions if (kr == KERN_SUCCESS) {
35*aca3beaaSApple OSS Distributions _needs_reset = true;
36*aca3beaaSApple OSS Distributions }
37*aca3beaaSApple OSS Distributions return kr;
38*aca3beaaSApple OSS Distributions }
39*aca3beaaSApple OSS Distributions
40*aca3beaaSApple OSS Distributions static void
_reset_atm_diagnostic_flag(void)41*aca3beaaSApple OSS Distributions _reset_atm_diagnostic_flag(void)
42*aca3beaaSApple OSS Distributions {
43*aca3beaaSApple OSS Distributions if (!_needs_reset) {
44*aca3beaaSApple OSS Distributions return;
45*aca3beaaSApple OSS Distributions }
46*aca3beaaSApple OSS Distributions T_LOG("Reset ATM diagnostic flag to: 0x%08x", _original);
47*aca3beaaSApple OSS Distributions kern_return_t kr;
48*aca3beaaSApple OSS Distributions kr = host_set_atm_diagnostic_flag(mach_host_self(), _original);
49*aca3beaaSApple OSS Distributions if (kr != KERN_SUCCESS) {
50*aca3beaaSApple OSS Distributions T_ASSERT_FAIL("host_set_atm_diagnostic_flag() failed: %s",
51*aca3beaaSApple OSS Distributions mach_error_string(kr));
52*aca3beaaSApple OSS Distributions }
53*aca3beaaSApple OSS Distributions }
54*aca3beaaSApple OSS Distributions
55*aca3beaaSApple OSS Distributions static void
_toggle_atm_diagnostic_flag(void)56*aca3beaaSApple OSS Distributions _toggle_atm_diagnostic_flag(void)
57*aca3beaaSApple OSS Distributions {
58*aca3beaaSApple OSS Distributions T_ATEND(_reset_atm_diagnostic_flag);
59*aca3beaaSApple OSS Distributions uint32_t f = _save_atm_diagnostic_flag();
60*aca3beaaSApple OSS Distributions f ^= LIBTRACE_PRIVATE_DATA;
61*aca3beaaSApple OSS Distributions kern_return_t kr = _mutate_atm_diagnostic_flag(f);
62*aca3beaaSApple OSS Distributions if (kr == KERN_NOT_SUPPORTED) {
63*aca3beaaSApple OSS Distributions T_SKIP("Seems ATM is disabled on this platform. "
64*aca3beaaSApple OSS Distributions "Ignoring host_set_atm_diagnostic_flag functionality. "
65*aca3beaaSApple OSS Distributions "Bailing gracefully.");
66*aca3beaaSApple OSS Distributions }
67*aca3beaaSApple OSS Distributions T_EXPECT_MACH_ERROR(KERN_NO_ACCESS, kr,
68*aca3beaaSApple OSS Distributions "Deny change to atm_diagnostic_flag");
69*aca3beaaSApple OSS Distributions }
70*aca3beaaSApple OSS Distributions
71*aca3beaaSApple OSS Distributions T_DECL(atm_diagnostic_flag_unentitled_privileged,
72*aca3beaaSApple OSS Distributions "expect to fail to set the atm_diagnostic_flag (unentitled, privileged)",
73*aca3beaaSApple OSS Distributions T_META_ASROOT(true))
74*aca3beaaSApple OSS Distributions {
75*aca3beaaSApple OSS Distributions _toggle_atm_diagnostic_flag();
76*aca3beaaSApple OSS Distributions }
77*aca3beaaSApple OSS Distributions
78*aca3beaaSApple OSS Distributions T_DECL(atm_diagnostic_flag_unentitled_unprivileged,
79*aca3beaaSApple OSS Distributions "expect to fail to set the atm_diagnostic_flag (unentitled, unprivileged)",
80*aca3beaaSApple OSS Distributions T_META_ASROOT(false))
81*aca3beaaSApple OSS Distributions {
82*aca3beaaSApple OSS Distributions if (running_as_root()) {
83*aca3beaaSApple OSS Distributions drop_priv();
84*aca3beaaSApple OSS Distributions }
85*aca3beaaSApple OSS Distributions _toggle_atm_diagnostic_flag();
86*aca3beaaSApple OSS Distributions }
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