blob: ed12c8900d83fd944994063a0f5c4b62cb8036b0 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
/*
* ========================================================
*
* newoskrnl
* Copyright ZKA Technologies., all rights reserved.
*
* ========================================================
*/
#include <NewKit/String.hxx>
#include <CFKit/Property.hxx>
#include <KernelKit/ProcessScheduler.hxx>
#include <KernelKit/ThreadLocalStorage.hxx>
///! BUGS: 0
/***********************************************************************************/
/// @file ThreadLocalStorage.cxx
/// @brief TLS inside the kernel.
/***********************************************************************************/
using namespace Kernel;
namespace Detail
{
/// \brief Process thread information header.
struct THREAD_HEADER_BLOCK final
{
STATIC constexpr SizeT cMaxLen = 256;
Char fName[cMaxLen] = {"THREAD #0 (PROCESS 0)"};
ProcessStatus fThreadStatus;
Int64 fThreadID;
UIntPtr fCode{0};
UIntPtr fStack{0};
UIntPtr fData{0};
Void Exit() noexcept
{
this->fThreadStatus = ProcessStatus::kKilled;
}
UIntPtr GetStack() noexcept
{
return fStack;
}
UIntPtr GetData() noexcept
{
return fData;
}
UIntPtr GetPC() noexcept
{
return fCode;
}
};
} // namespace Detail
/**
* @brief Checks for cookie inside the TIB.
* @param tib the TIB to check.
* @return if the cookie is enabled.
*/
Boolean tls_check_tib(THREAD_INFORMATION_BLOCK* the_tib)
{
if (!the_tib ||
!the_tib->f_ThreadRecord)
return false;
Encoder encoder;
const char* tibAsBytes = encoder.AsBytes(the_tib);
kcout << "newoskrnl: checking for a valid cookie inside the TIB...\r";
return tibAsBytes[0] == kCookieMag0 && tibAsBytes[1] == kCookieMag1 &&
tibAsBytes[2] == kCookieMag2;
}
/**
* @brief System call implementation of the TLS check.
* @param tib_ptr The TIB record.
* @return
*/
EXTERN_C Bool tls_check_syscall_impl(Kernel::VoidPtr tib_ptr) noexcept
{
if (!tib_ptr)
{
kcout << "newoskrnl: failing because of an invalid TIB...\r";
return false;
}
THREAD_INFORMATION_BLOCK* tib_struct = (THREAD_INFORMATION_BLOCK*)tib_ptr;
if (!tls_check_tib(tib_struct))
{
kcout << "newoskrnl: crashing because of an invalid TIB...\r";
return false;
}
kcout << "newoskrnl: Verification succeeded! staying alive...\r";
return true;
}
|
