sploit_stack.c

// Copyright (c) 2011-2012 Rusty Wagner
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to
// deal in the Software without restriction, including without limitation the
// rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
// sell copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
// IN THE SOFTWARE.

void* sploit(void* tempBuffer)
{
	// Place shellcode buffer in this stack frame, which means the
	// stack pointer will be past the code.  This will test the
	// stack pivot logic to ensure code doesn't get corrupted.
	size_t bytes = read(0, tempBuffer, 65536);
	void* buffer = alloca(bytes);
	memcpy(buffer, tempBuffer, bytes);
	memset(tempBuffer, bytes, 0);
	return buffer;
}

void main()
{
	char data[65536];
	goto *sploit(data);
}