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small fix

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donnaskiez 2024-07-13 19:51:06 +10:00
parent 0b729a6fa0
commit 0e6f4def14
1 changed files with 11 additions and 2 deletions
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13
driver/modules.c
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@ -691,7 +691,16 @@ DoesRetInstructionCauseException(_In_ UINT64 ReturnAddress)
if (IsUserModeAddress(ReturnAddress)) if (IsUserModeAddress(ReturnAddress))
return FALSE; return FALSE;
RtlCopyMemory(&opcodes, ReturnAddress, sizeof(opcodes)); if (!MmIsAddressValid(ReturnAddress))
return FALSE;
/* Shoudln't really ever occur */
__try {
RtlCopyMemory(&opcodes, ReturnAddress, sizeof(opcodes));
}
__except (EXCEPTION_EXECUTE_HANDLER) {
return FALSE;
}
if (opcodes[0] == INSTRUCTION_UD2_BYTE_1 && if (opcodes[0] == INSTRUCTION_UD2_BYTE_1 &&
opcodes[1] == INSTRUCTION_UD2_BYTE_2) opcodes[1] == INSTRUCTION_UD2_BYTE_2)
@ -700,7 +709,7 @@ DoesRetInstructionCauseException(_In_ UINT64 ReturnAddress)
if (opcodes[0] == INSTRUCTION_INT3_BYTE_1) if (opcodes[0] == INSTRUCTION_INT3_BYTE_1)
return TRUE; return TRUE;
DEBUG_VERBOSE("Ret address instruction doesnt throw exception"); DEBUG_VERBOSE("Ret address instruction doesnt unconditionally throw exception");
return FALSE; return FALSE;
} }