1*a1e26a70SApple OSS Distributions #include <darwintest.h>
2*a1e26a70SApple OSS Distributions
3*a1e26a70SApple OSS Distributions #include <mach/mach_error.h>
4*a1e26a70SApple OSS Distributions #include <mach/mach_host.h>
5*a1e26a70SApple OSS Distributions
6*a1e26a70SApple OSS Distributions #include "drop_priv.h"
7*a1e26a70SApple OSS Distributions
8*a1e26a70SApple OSS Distributions T_GLOBAL_META(T_META_NAMESPACE("xnu.debugging"));
9*a1e26a70SApple OSS Distributions
10*a1e26a70SApple OSS Distributions /*
11*a1e26a70SApple OSS Distributions * The low 8 bits may be in use, so modify one
12*a1e26a70SApple OSS Distributions * of the upper 8 bits to ensure round-tripping.
13*a1e26a70SApple OSS Distributions */
14*a1e26a70SApple OSS Distributions #define LIBTRACE_PRIVATE_DATA 0x01000000
15*a1e26a70SApple OSS Distributions
16*a1e26a70SApple OSS Distributions static bool _needs_reset;
17*a1e26a70SApple OSS Distributions static uint32_t _original;
18*a1e26a70SApple OSS Distributions
19*a1e26a70SApple OSS Distributions static uint32_t
_save_atm_diagnostic_flag(void)20*a1e26a70SApple OSS Distributions _save_atm_diagnostic_flag(void)
21*a1e26a70SApple OSS Distributions {
22*a1e26a70SApple OSS Distributions kern_return_t kr;
23*a1e26a70SApple OSS Distributions kr = host_get_atm_diagnostic_flag(mach_host_self(), &_original);
24*a1e26a70SApple OSS Distributions T_QUIET; T_ASSERT_MACH_SUCCESS(kr, "host_get_atm_diagnostic_flag()");
25*a1e26a70SApple OSS Distributions T_LOG("Original ATM diagnostic flag: 0x%08x", _original);
26*a1e26a70SApple OSS Distributions return _original;
27*a1e26a70SApple OSS Distributions }
28*a1e26a70SApple OSS Distributions
29*a1e26a70SApple OSS Distributions static kern_return_t
_mutate_atm_diagnostic_flag(uint32_t v)30*a1e26a70SApple OSS Distributions _mutate_atm_diagnostic_flag(uint32_t v)
31*a1e26a70SApple OSS Distributions {
32*a1e26a70SApple OSS Distributions T_LOG("Try to set ATM diagnostic flag to: 0x%08x", v);
33*a1e26a70SApple OSS Distributions kern_return_t kr = host_set_atm_diagnostic_flag(mach_host_self(), v);
34*a1e26a70SApple OSS Distributions if (kr == KERN_SUCCESS) {
35*a1e26a70SApple OSS Distributions _needs_reset = true;
36*a1e26a70SApple OSS Distributions }
37*a1e26a70SApple OSS Distributions return kr;
38*a1e26a70SApple OSS Distributions }
39*a1e26a70SApple OSS Distributions
40*a1e26a70SApple OSS Distributions static void
_reset_atm_diagnostic_flag(void)41*a1e26a70SApple OSS Distributions _reset_atm_diagnostic_flag(void)
42*a1e26a70SApple OSS Distributions {
43*a1e26a70SApple OSS Distributions if (!_needs_reset) {
44*a1e26a70SApple OSS Distributions return;
45*a1e26a70SApple OSS Distributions }
46*a1e26a70SApple OSS Distributions T_LOG("Reset ATM diagnostic flag to: 0x%08x", _original);
47*a1e26a70SApple OSS Distributions kern_return_t kr;
48*a1e26a70SApple OSS Distributions kr = host_set_atm_diagnostic_flag(mach_host_self(), _original);
49*a1e26a70SApple OSS Distributions if (kr != KERN_SUCCESS) {
50*a1e26a70SApple OSS Distributions T_ASSERT_FAIL("host_set_atm_diagnostic_flag() failed: %s",
51*a1e26a70SApple OSS Distributions mach_error_string(kr));
52*a1e26a70SApple OSS Distributions }
53*a1e26a70SApple OSS Distributions }
54*a1e26a70SApple OSS Distributions
55*a1e26a70SApple OSS Distributions static void
_toggle_atm_diagnostic_flag(void)56*a1e26a70SApple OSS Distributions _toggle_atm_diagnostic_flag(void)
57*a1e26a70SApple OSS Distributions {
58*a1e26a70SApple OSS Distributions T_ATEND(_reset_atm_diagnostic_flag);
59*a1e26a70SApple OSS Distributions uint32_t f = _save_atm_diagnostic_flag();
60*a1e26a70SApple OSS Distributions f ^= LIBTRACE_PRIVATE_DATA;
61*a1e26a70SApple OSS Distributions kern_return_t kr = _mutate_atm_diagnostic_flag(f);
62*a1e26a70SApple OSS Distributions if (kr == KERN_NOT_SUPPORTED) {
63*a1e26a70SApple OSS Distributions T_SKIP("Seems ATM is disabled on this platform. "
64*a1e26a70SApple OSS Distributions "Ignoring host_set_atm_diagnostic_flag functionality. "
65*a1e26a70SApple OSS Distributions "Bailing gracefully.");
66*a1e26a70SApple OSS Distributions }
67*a1e26a70SApple OSS Distributions T_EXPECT_MACH_ERROR(KERN_NO_ACCESS, kr,
68*a1e26a70SApple OSS Distributions "Deny change to atm_diagnostic_flag");
69*a1e26a70SApple OSS Distributions }
70*a1e26a70SApple OSS Distributions
71*a1e26a70SApple OSS Distributions T_DECL(atm_diagnostic_flag_unentitled_privileged,
72*a1e26a70SApple OSS Distributions "expect to fail to set the atm_diagnostic_flag (unentitled, privileged)",
73*a1e26a70SApple OSS Distributions T_META_ASROOT(true))
74*a1e26a70SApple OSS Distributions {
75*a1e26a70SApple OSS Distributions _toggle_atm_diagnostic_flag();
76*a1e26a70SApple OSS Distributions }
77*a1e26a70SApple OSS Distributions
78*a1e26a70SApple OSS Distributions T_DECL(atm_diagnostic_flag_unentitled_unprivileged,
79*a1e26a70SApple OSS Distributions "expect to fail to set the atm_diagnostic_flag (unentitled, unprivileged)",
80*a1e26a70SApple OSS Distributions T_META_ASROOT(false))
81*a1e26a70SApple OSS Distributions {
82*a1e26a70SApple OSS Distributions if (running_as_root()) {
83*a1e26a70SApple OSS Distributions drop_priv();
84*a1e26a70SApple OSS Distributions }
85*a1e26a70SApple OSS Distributions _toggle_atm_diagnostic_flag();
86*a1e26a70SApple OSS Distributions }
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