52 lines
2.8 KiB
Python
52 lines
2.8 KiB
Python
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from unicorn import *
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from unicorn.arm_const import *
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# .text:0001F894 ADD PC, PC, R3
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# .text:0001F898 ; ---------------------------------------------------------------------------
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# .text:0001F898 VLD1.8 {D0}, [R1]!
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# .text:0001F89C VST1.8 {D0}, [R12]!
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# .text:0001F8A0 VLD1.8 {D0}, [R1]!
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# .text:0001F8A4 VST1.8 {D0}, [R12]!
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# .text:0001F8A8 VLD1.8 {D0}, [R1]!
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# .text:0001F8AC VST1.8 {D0}, [R12]!
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# .text:0001F8B0 VLD1.8 {D0}, [R1]!
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# .text:0001F8B4 VST1.8 {D0}, [R12]!
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# .text:0001F8B8 VLD1.8 {D0}, [R1]!
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# .text:0001F8BC VST1.8 {D0}, [R12]!
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# .text:0001F8C0 VLD1.8 {D0}, [R1]!
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# .text:0001F8C4 VST1.8 {D0}, [R12]!
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# .text:0001F8C8 VLD1.8 {D0}, [R1]!
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# .text:0001F8CC VST1.8 {D0}, [R12]!
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# .text:0001F8D0 TST R2, #4
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# .text:0001F8D4 LDRNE R3, [R1],#4
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# .text:0001F8D8 STRNE R3, [R12],#4
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# .text:0001F8DC MOVS R2, R2,LSL#31
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# .text:0001F8E0 LDRHCS R3, [R1],#2
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# .text:0001F8E4 LDRBNE R1, [R1]
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# .text:0001F8E8 STRHCS R3, [R12],#2
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# .text:0001F8EC STRBNE R1, [R12]
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shellcode = [0x3, 0xf0, 0x8f, 0xe0, 0xd, 0x7, 0x21, 0xf4, 0xd, 0x7, 0xc, 0xf4, 0xd, 0x7, 0x21, 0xf4, 0xd, 0x7, 0xc, 0xf4, 0xd, 0x7, 0x21, 0xf4, 0xd, 0x7, 0xc, 0xf4, 0xd, 0x7, 0x21, 0xf4, 0xd, 0x7, 0xc, 0xf4, 0xd, 0x7, 0x21, 0xf4, 0xd, 0x7, 0xc, 0xf4, 0xd, 0x7, 0x21, 0xf4, 0xd, 0x7, 0xc, 0xf4, 0xd, 0x7, 0x21, 0xf4, 0xd, 0x7, 0xc, 0xf4, 0x4, 0x0, 0x12, 0xe3, 0x4, 0x30, 0x91, 0x14, 0x4, 0x30, 0x8c, 0x14, 0x82, 0x2f, 0xb0, 0xe1, 0xb2, 0x30, 0xd1, 0x20, 0x0, 0x10, 0xd1, 0x15, 0xb2, 0x30, 0xcc, 0x20, 0x0, 0x10, 0xcc, 0x15]
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base = 0x1F894
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from_address = 0x1000
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to_address = 0x2000
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cplen = 8
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bs = b"c8"*cplen
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uc = Uc(UC_ARCH_ARM, UC_MODE_ARM)
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uc.mem_map(from_address, 0x1000)
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uc.mem_map(to_address, 0x1000)
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uc.mem_map(0x1F000, 0x1000)
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uc.mem_write(from_address, bs)
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uc.mem_write(base, bytes(shellcode))
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uc.reg_write(UC_ARM_REG_R12, to_address)
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uc.reg_write(UC_ARM_REG_R1, from_address)
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uc.reg_write(UC_ARM_REG_R2, cplen)
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uc.reg_write(UC_ARM_REG_R3, 0x24)
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# enable_vfp
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uc.reg_write(UC_ARM_REG_C1_C0_2, uc.reg_read(UC_ARM_REG_C1_C0_2) | (0xf << 20))
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uc.reg_write(UC_ARM_REG_FPEXC, 0x40000000)
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uc.emu_start(base, base+len(shellcode))
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fr = uc.mem_read(from_address, len(bs))
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to = uc.mem_read(to_address, len(bs))
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print(f"memcpy result:\nfrom: {bytes(fr)}\nto: {bytes(to)}")
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