c9a028cc18
This tool is a scriptable (lua) tool to patch binaries, it supports: - raw binary - ELF - SB(v1/v2) It also contains some basic routines to parse and generate useful arm/thumb code like jump or register load/store. This is very useful to take a firmware and patch an interrupt vector or some code to jump to an extra payload added to the binary. Examples are provided for several STMP based target which the payload is expected to be hwstub, and also for the Sansa View. A typical patcher usually requires three elements: - the lua patcher itself - the payload (hwstub for example) - (optional) a small stub either to jump properly to the payload or determine under which circumstance to do the jump (hold a key for example) Change-Id: I6d36020a3bc9e636615ac8221b7591ade5f251e3
49 lines
1.7 KiB
Lua
49 lines
1.7 KiB
Lua
--[[
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Creative ZEN hacking
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required argument (in order):
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- path to firmware
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- path to output firmware
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- path to blob
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- path to stub
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]]--
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if #arg < 4 then
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error("not enough argument to fuzep patcher")
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end
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local fw = hwp.load_file(arg[1])
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local irq_addr_pool = hwp.make_addr(0x38)
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local proxy_addr = arm.to_arm(hwp.make_addr(0x402519A0))
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-- read old IRQ address pool
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local old_irq_addr = hwp.make_addr(hwp.read32(fw, irq_addr_pool))
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print(string.format("Old IRQ address: %s", old_irq_addr))
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-- put stub at the beginning of the proxy
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local stub = hwp.load_bin_file(arg[4])
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local stub_info = hwp.section_info(stub, "")
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local stub_data = hwp.read(stub, hwp.make_addr(stub_info.addr, ""), stub_info.size)
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hwp.write(fw, proxy_addr, stub_data)
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local stub_addr = proxy_addr
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proxy_addr = hwp.inc_addr(proxy_addr, stub_info.size)
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-- modify irq
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hwp.write32(fw, irq_addr_pool, proxy_addr.addr)
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print(string.format("New IRQ address: %s", proxy_addr))
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-- in proxy, save registers
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arm.write_save_regs(fw, proxy_addr)
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proxy_addr = hwp.inc_addr(proxy_addr, 4)
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-- load blob
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local blob = hwp.load_bin_file(arg[3])
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local blob_info = hwp.section_info(blob, "")
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-- patch blob with stub address
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hwp.write32(blob, hwp.make_addr(blob_info.addr + 4, ""), stub_addr.addr)
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-- write it !
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local blob_data = hwp.read(blob, hwp.make_addr(blob_info.addr, ""), blob_info.size)
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hwp.write(fw, proxy_addr, blob_data)
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proxy_addr = hwp.inc_addr(proxy_addr, blob_info.size)
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-- restore registers
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arm.write_restore_regs(fw, proxy_addr)
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proxy_addr = hwp.inc_addr(proxy_addr, 4)
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-- branch to old code
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local branch_to_old = arm.make_branch(old_irq_addr, false)
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arm.write_branch(fw, proxy_addr, branch_to_old, hwp.inc_addr(proxy_addr, 4))
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-- save
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hwp.save_file(fw, arg[2])
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