PPC and Sparc nop generators
git-svn-id: file:///home/svn/incoming/trunk@3269 4d416f70-5f16-0410-b530-b9f4589650daunstable
HD Moore
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52858d1078
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a96cfa6b78
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require 'msf/core'
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module Msf
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module Nops
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module Ppc
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###
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#
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# SingleByte
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# ----------
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#
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# This class implements simple NOP generator for PowerPC
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#
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###
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class Simple < Msf::Nop
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def initialize
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super(
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'Name' => 'Simple',
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'Alias' => 'ppc_simple',
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'Version' => '$Revision$',
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'Description' => 'Simple NOP generator',
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'Author' => 'hdm',
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'Arch' => ARCH_PPC)
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register_advanced_options(
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[
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OptBool.new('RandomNops', [ false, "Generate a random NOP sled", true ])
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], self.class)
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end
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def generate_sled(length, opts)
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badchars = opts['BadChars'] || ''
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random = opts['Random'] || datastore['RandomNops']
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if( random and random.match(/^(t|y|1)/i) )
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1.upto(1024) do |i|
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regs_d = (rand(0x8000 - 0x0800) + 0x0800).to_i
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regs_b = [regs_d].pack('n').unpack('B*')[0][1, 15]
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flag_o = rand(2).to_i
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flag_r = rand(2).to_i
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pcword = ["011111#{regs_b}#{flag_o}100001010#{flag_r}"].pack("B*")
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failed = false
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pcword.each_byte do |c|
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failed = true if badchars.include?(c.chr)
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end
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next if failed
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return (pcword * (length / 4))[0, length]
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end
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end
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return ("\x60" * length)[0, length]
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end
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end
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end end end
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require 'msf/core'
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module Msf
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module Nops
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module Sparc
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###
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#
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# SingleByte
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# ----------
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#
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# This class implements NOP generator for the SPARC platform
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#
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###
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class Vlad902 < Msf::Nop
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# Nop types
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InsSethi = 0
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InsArithmetic = 1
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InsBranch = 2
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# Generator table
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SPARC_Table = [
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[ InsSethi, [ ], ], # sethi
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[ InsArithmetic, [ 0, 0 ], ], # add
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[ InsArithmetic, [ 0, 1 ], ], # and
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[ InsArithmetic, [ 0, 2 ], ], # or
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[ InsArithmetic, [ 0, 3 ], ], # xor
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[ InsArithmetic, [ 0, 4 ], ], # sub
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[ InsArithmetic, [ 0, 5 ], ], # andn
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[ InsArithmetic, [ 0, 6 ], ], # orn
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[ InsArithmetic, [ 0, 7 ], ], # xnor
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[ InsArithmetic, [ 0, 8 ], ], # addx
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[ InsArithmetic, [ 0, 12 ], ], # subx
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[ InsArithmetic, [ 0, 16 ], ], # addcc
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[ InsArithmetic, [ 0, 17 ], ], # andcc
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[ InsArithmetic, [ 0, 18 ], ], # orcc
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[ InsArithmetic, [ 0, 19 ], ], # xorcc
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[ InsArithmetic, [ 0, 20 ], ], # subcc
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[ InsArithmetic, [ 0, 21 ], ], # andncc
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[ InsArithmetic, [ 0, 22 ], ], # orncc
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[ InsArithmetic, [ 0, 23 ], ], # xnorcc
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[ InsArithmetic, [ 0, 24 ], ], # addxcc
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[ InsArithmetic, [ 0, 28 ], ], # subxcc
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[ InsArithmetic, [ 0, 32 ], ], # taddcc
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[ InsArithmetic, [ 0, 33 ], ], # tsubcc
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[ InsArithmetic, [ 0, 36 ], ], # mulscc
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[ InsArithmetic, [ 2, 37 ], ], # sll
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[ InsArithmetic, [ 2, 38 ], ], # srl
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[ InsArithmetic, [ 2, 39 ], ], # sra
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[ InsArithmetic, [ 4, 40 ], ], # rdy
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[ InsArithmetic, [ 3, 48 ], ], # wry
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[ InsBranch, [ 0 ] ], # bn[,a]
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[ InsBranch, [ 1 ] ], # be[,a]
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[ InsBranch, [ 2 ] ], # ble[,a]
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[ InsBranch, [ 3 ] ], # bl[,a]
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[ InsBranch, [ 4 ] ], # bleu[,a]
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[ InsBranch, [ 5 ] ], # bcs[,a]
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[ InsBranch, [ 6 ] ], # bneg[,a]
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[ InsBranch, [ 7 ] ], # bvs[,a]
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[ InsBranch, [ 8 ] ], # ba[,a]
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[ InsBranch, [ 9 ] ], # bne[,a]
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[ InsBranch, [ 10 ] ], # bg[,a]
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[ InsBranch, [ 11 ] ], # bge[,a]
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[ InsBranch, [ 12 ] ], # bgu[,a]
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[ InsBranch, [ 13 ] ], # bcc[,a]
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[ InsBranch, [ 14 ] ], # bpos[,a]
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[ InsBranch, [ 15 ] ], # bvc[,a]
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]
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def initialize
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super(
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'Name' => 'Vlad902 SPARC',
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'Alias' => 'ppc_simple',
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'Version' => '$Revision$',
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'Description' => 'SPARC NOP generator',
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'Author' => 'vlad902',
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'Arch' => ARCH_SPARC)
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register_advanced_options(
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[
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OptBool.new('RandomNops', [ false, "Generate a random NOP sled", true ])
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], self.class)
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end
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# Nops are always random...
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def generate_sled(length, opts)
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badchars = opts['BadChars'] || ''
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random = opts['Random'] || datastore['RandomNops']
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blen = length
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buff = ''
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count = 0
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while (buff.length < blen)
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r = SPARC_Table[ rand(SPARC_Table.length) ]
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t = ''
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case r[0]
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when InsSethi
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t = ins_sethi(r[1], blen - buff.length)
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when InsArithmetic
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t = ins_arithmetic(r[1], blen - buff.length)
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when InsBranch
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t = ins_branch(r[1], blen - buff.length)
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else
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print_status("Invalid opcode type")
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raise RuntimeError
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end
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failed = false
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t.each_byte do |c|
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failed = true if badchars.include?(c.chr)
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end
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if (not failed)
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buff << t
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count = 0
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end
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if (count > length + 1000)
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print_status("The SPARC nop generator could not create a usable sled")
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raise RuntimeError
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end
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count += 1
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end
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return buff
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end
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def get_dst_reg
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reg = rand(30)
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reg += 1 if (reg >= 14)
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reg += 1 if (reg >= 30)
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return reg.to_i
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end
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def get_src_reg
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return rand(30).to_i
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end
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def ins_sethi(ref, len=0)
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[(get_dst_reg() << 25) | (4 << 22) | rand(1 << 22)].pack('N')
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end
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def ins_arithmetic(ref, len=0)
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dst = get_dst_reg()
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ver = ref[0]
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# WRY fixups
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if (ver == 3)
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dst = 0
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ver = 1
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end
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# 0, ~1, !2, ~3, !4
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# Use one src reg with a signed 13-bit immediate (non-0)
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if((ver == 0 && rand(2)) || ver == 1)
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return [
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(2 << 30) |
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(dst << 25) |
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(ref[1] << 19) |
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(get_src_reg() << 14) |
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(1 << 13) |
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(rand((1 << 13) - 1) + 1)
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].pack('N')
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end
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# ref[1] could be replaced with a static value since this only encodes for one function but it's done this way for consistancy.
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if (ver == 4)
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return [(2 << 30) | (dst << 25) | (ref[1] << 19)].pack('N')
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end
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# Use two src regs
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return [
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(2 << 30) |
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(dst << 25) |
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(ref[1] << 19) |
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(get_src_reg() << 14) |
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get_src_reg()
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].pack('N')
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end
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def ins_branch(ref, len)
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# We jump to 1 instruction before the payload so in cases where the delay slot of a branch with the the anull bit set that is not taken the first instruction of the
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# payload is not anulled.
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len = (len / 4) - 1
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return '' if len == 0
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len = 0x3fffff if (len >= 0x400000)
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return [
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(rand(2) << 29) |
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(ref[0] << 25) |
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(2 << 22) |
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rand(len - 1) + 1
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].pack('N')
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end
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end
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end end end
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