1*0f4c859eSApple OSS Distributions #include <darwintest.h>
2*0f4c859eSApple OSS Distributions
3*0f4c859eSApple OSS Distributions #include <mach/mach_error.h>
4*0f4c859eSApple OSS Distributions #include <mach/mach_host.h>
5*0f4c859eSApple OSS Distributions
6*0f4c859eSApple OSS Distributions #include "drop_priv.h"
7*0f4c859eSApple OSS Distributions
8*0f4c859eSApple OSS Distributions T_GLOBAL_META(T_META_NAMESPACE("xnu.debugging"));
9*0f4c859eSApple OSS Distributions
10*0f4c859eSApple OSS Distributions /*
11*0f4c859eSApple OSS Distributions * The low 8 bits may be in use, so modify one
12*0f4c859eSApple OSS Distributions * of the upper 8 bits to ensure round-tripping.
13*0f4c859eSApple OSS Distributions */
14*0f4c859eSApple OSS Distributions #define LIBTRACE_PRIVATE_DATA 0x01000000
15*0f4c859eSApple OSS Distributions
16*0f4c859eSApple OSS Distributions static bool _needs_reset;
17*0f4c859eSApple OSS Distributions static uint32_t _original;
18*0f4c859eSApple OSS Distributions
19*0f4c859eSApple OSS Distributions static uint32_t
_save_atm_diagnostic_flag(void)20*0f4c859eSApple OSS Distributions _save_atm_diagnostic_flag(void)
21*0f4c859eSApple OSS Distributions {
22*0f4c859eSApple OSS Distributions kern_return_t kr;
23*0f4c859eSApple OSS Distributions kr = host_get_atm_diagnostic_flag(mach_host_self(), &_original);
24*0f4c859eSApple OSS Distributions T_QUIET; T_ASSERT_MACH_SUCCESS(kr, "host_get_atm_diagnostic_flag()");
25*0f4c859eSApple OSS Distributions T_LOG("Original ATM diagnostic flag: 0x%08x", _original);
26*0f4c859eSApple OSS Distributions return _original;
27*0f4c859eSApple OSS Distributions }
28*0f4c859eSApple OSS Distributions
29*0f4c859eSApple OSS Distributions static kern_return_t
_mutate_atm_diagnostic_flag(uint32_t v)30*0f4c859eSApple OSS Distributions _mutate_atm_diagnostic_flag(uint32_t v)
31*0f4c859eSApple OSS Distributions {
32*0f4c859eSApple OSS Distributions T_LOG("Try to set ATM diagnostic flag to: 0x%08x", v);
33*0f4c859eSApple OSS Distributions kern_return_t kr = host_set_atm_diagnostic_flag(mach_host_self(), v);
34*0f4c859eSApple OSS Distributions if (kr == KERN_SUCCESS) {
35*0f4c859eSApple OSS Distributions _needs_reset = true;
36*0f4c859eSApple OSS Distributions }
37*0f4c859eSApple OSS Distributions return kr;
38*0f4c859eSApple OSS Distributions }
39*0f4c859eSApple OSS Distributions
40*0f4c859eSApple OSS Distributions static void
_reset_atm_diagnostic_flag(void)41*0f4c859eSApple OSS Distributions _reset_atm_diagnostic_flag(void)
42*0f4c859eSApple OSS Distributions {
43*0f4c859eSApple OSS Distributions if (!_needs_reset) {
44*0f4c859eSApple OSS Distributions return;
45*0f4c859eSApple OSS Distributions }
46*0f4c859eSApple OSS Distributions T_LOG("Reset ATM diagnostic flag to: 0x%08x", _original);
47*0f4c859eSApple OSS Distributions kern_return_t kr;
48*0f4c859eSApple OSS Distributions kr = host_set_atm_diagnostic_flag(mach_host_self(), _original);
49*0f4c859eSApple OSS Distributions if (kr != KERN_SUCCESS) {
50*0f4c859eSApple OSS Distributions T_ASSERT_FAIL("host_set_atm_diagnostic_flag() failed: %s",
51*0f4c859eSApple OSS Distributions mach_error_string(kr));
52*0f4c859eSApple OSS Distributions }
53*0f4c859eSApple OSS Distributions }
54*0f4c859eSApple OSS Distributions
55*0f4c859eSApple OSS Distributions static void
_toggle_atm_diagnostic_flag(void)56*0f4c859eSApple OSS Distributions _toggle_atm_diagnostic_flag(void)
57*0f4c859eSApple OSS Distributions {
58*0f4c859eSApple OSS Distributions T_ATEND(_reset_atm_diagnostic_flag);
59*0f4c859eSApple OSS Distributions uint32_t f = _save_atm_diagnostic_flag();
60*0f4c859eSApple OSS Distributions f ^= LIBTRACE_PRIVATE_DATA;
61*0f4c859eSApple OSS Distributions kern_return_t kr = _mutate_atm_diagnostic_flag(f);
62*0f4c859eSApple OSS Distributions if (kr == KERN_NOT_SUPPORTED) {
63*0f4c859eSApple OSS Distributions T_SKIP("Seems ATM is disabled on this platform. "
64*0f4c859eSApple OSS Distributions "Ignoring host_set_atm_diagnostic_flag functionality. "
65*0f4c859eSApple OSS Distributions "Bailing gracefully.");
66*0f4c859eSApple OSS Distributions }
67*0f4c859eSApple OSS Distributions T_EXPECT_MACH_ERROR(KERN_NO_ACCESS, kr,
68*0f4c859eSApple OSS Distributions "Deny change to atm_diagnostic_flag");
69*0f4c859eSApple OSS Distributions }
70*0f4c859eSApple OSS Distributions
71*0f4c859eSApple OSS Distributions T_DECL(atm_diagnostic_flag_unentitled_privileged,
72*0f4c859eSApple OSS Distributions "expect to fail to set the atm_diagnostic_flag (unentitled, privileged)",
73*0f4c859eSApple OSS Distributions T_META_ASROOT(true))
74*0f4c859eSApple OSS Distributions {
75*0f4c859eSApple OSS Distributions _toggle_atm_diagnostic_flag();
76*0f4c859eSApple OSS Distributions }
77*0f4c859eSApple OSS Distributions
78*0f4c859eSApple OSS Distributions T_DECL(atm_diagnostic_flag_unentitled_unprivileged,
79*0f4c859eSApple OSS Distributions "expect to fail to set the atm_diagnostic_flag (unentitled, unprivileged)",
80*0f4c859eSApple OSS Distributions T_META_ASROOT(false))
81*0f4c859eSApple OSS Distributions {
82*0f4c859eSApple OSS Distributions if (running_as_root()) {
83*0f4c859eSApple OSS Distributions drop_priv();
84*0f4c859eSApple OSS Distributions }
85*0f4c859eSApple OSS Distributions _toggle_atm_diagnostic_flag();
86*0f4c859eSApple OSS Distributions }
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