mirror of
https://github.com/reactos/reactos.git
synced 2024-10-31 20:02:55 +00:00
186 lines
3.8 KiB
C
186 lines
3.8 KiB
C
#define WIN32_LEAN_AND_MEAN
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#define STRICT
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#include <windows.h>
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#include <assert.h>
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#include <setjmp.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <limits.h>
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#include <time.h>
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static unsigned int nRandBytes;
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static int initrand(void)
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{
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unsigned int nRandMax;
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unsigned int nRandMaxBits;
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time_t tLoc;
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nRandMax = RAND_MAX;
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for(nRandMaxBits = 0; nRandMax != 0; nRandMax >>= 1, ++ nRandMaxBits);
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nRandBytes = nRandMaxBits / CHAR_BIT;
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assert(nRandBytes != 0);
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srand((unsigned)(time(&tLoc) & UINT_MAX));
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return 1;
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}
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static void randbytes(void * p, size_t n)
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{
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unsigned char * b;
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size_t i;
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int r = rand();
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b = (unsigned char *)p;
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for(i = 0; i < n; ++ i)
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{
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if(i % nRandBytes == 0)
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r = rand();
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b[i] = (unsigned char)(r & UCHAR_MAX);
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r >>= CHAR_BIT;
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}
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}
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static ULONG randULONG(void)
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{
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ULONG n;
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randbytes(&n, sizeof(n));
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return n;
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}
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#ifdef _M_IX86
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#define ZWC_SEGMENT_BITS (0xFFFF)
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#define ZWC_EFLAGS_BITS (0x3C0CD5)
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#endif
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static jmp_buf jmpbuf;
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static CONTEXT continueContext;
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extern void continuePoint(void);
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extern void check(CONTEXT *);
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extern LONG NTAPI ZwContinue(IN CONTEXT *, IN BOOLEAN);
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void check(CONTEXT * actualContext)
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{
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#ifdef _M_IX86
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assert(actualContext->ContextFlags == CONTEXT_FULL);
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/* Random data segments */
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assert
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(
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(actualContext->SegGs & ZWC_SEGMENT_BITS) ==
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(continueContext.SegGs & ZWC_SEGMENT_BITS)
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);
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assert
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(
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(actualContext->SegFs & ZWC_SEGMENT_BITS) ==
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(continueContext.SegFs & ZWC_SEGMENT_BITS)
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);
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assert
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(
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(actualContext->SegEs & ZWC_SEGMENT_BITS) ==
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(continueContext.SegEs & ZWC_SEGMENT_BITS)
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);
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assert
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(
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(actualContext->SegDs & ZWC_SEGMENT_BITS) ==
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(continueContext.SegDs & ZWC_SEGMENT_BITS)
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);
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/* Integer registers */
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assert(actualContext->Edi == continueContext.Edi);
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assert(actualContext->Esi == continueContext.Esi);
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assert(actualContext->Ebx == continueContext.Ebx);
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printf("%s %lX : %lX\n", "Edx", actualContext->Edx, continueContext.Edx);
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//assert(actualContext->Edx == continueContext.Edx);
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assert(actualContext->Ecx == continueContext.Ecx);
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assert(actualContext->Eax == continueContext.Eax);
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/* Control registers and segments */
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assert(actualContext->Ebp == continueContext.Ebp);
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assert(actualContext->Eip == continueContext.Eip);
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assert
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(
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(actualContext->SegCs & ZWC_SEGMENT_BITS) ==
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(continueContext.SegCs & ZWC_SEGMENT_BITS)
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);
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assert
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(
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(actualContext->EFlags & ZWC_EFLAGS_BITS) ==
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(continueContext.EFlags & ZWC_EFLAGS_BITS)
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);
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assert(actualContext->Esp == continueContext.Esp);
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assert
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(
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(actualContext->SegSs & ZWC_SEGMENT_BITS) ==
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(continueContext.SegSs & ZWC_SEGMENT_BITS)
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);
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#endif
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longjmp(jmpbuf, 1);
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}
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int main(void)
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{
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initrand();
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/* First time */
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if(setjmp(jmpbuf) == 0)
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{
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CONTEXT bogus;
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continueContext.ContextFlags = CONTEXT_FULL;
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GetThreadContext(GetCurrentThread(), &continueContext);
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#ifdef _M_IX86
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continueContext.ContextFlags = CONTEXT_FULL;
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/* Fill the integer registers with random values */
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continueContext.Edi = randULONG();
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continueContext.Esi = randULONG();
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continueContext.Ebx = randULONG();
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continueContext.Edx = randULONG();
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continueContext.Ecx = randULONG();
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continueContext.Eax = randULONG();
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continueContext.Ebp = randULONG();
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/* Randomize all the allowed flags (determined experimentally with WinDbg) */
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continueContext.EFlags = randULONG() & 0x3C0CD5;
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/* Randomize the stack pointer as much as possible */
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continueContext.Esp =
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(ULONG)(((ULONG_PTR)&bogus) & 0xFFFFFFFF) +
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sizeof(bogus) -
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(randULONG() & 0xF) * 4;
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/* continuePoint() is implemented in assembler */
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continueContext.Eip = (ULONG)((ULONG_PTR)continuePoint & 0xFFFFFFF);
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/* Can't do a lot about segments */
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#endif
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ZwContinue(&continueContext, FALSE);
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}
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/* Second time */
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else
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return 0;
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assert(0);
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return 1;
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}
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