Python SimState.satisfiable方法代码示例

# 需要导入模块: from simuvex import SimState [as 别名]
# 或者: from simuvex.SimState import satisfiable [as 别名]
def test_unsat_core():

    s = SimState(arch='AMD64', mode='symbolic', add_options={ simuvex.options.CONSTRAINT_TRACKING_IN_SOLVER })
    x = s.se.BVS('x', 32)
    s.add_constraints(s.se.BVV(0, 32) == x)
    s.add_constraints(s.se.BVV(1, 32) == x)

    nose.tools.assert_false(s.satisfiable())
    unsat_core = s.se.unsat_core()
    nose.tools.assert_equal(len(unsat_core), 2)

# 需要导入模块: from simuvex import SimState [as 别名]
# 或者: from simuvex.SimState import satisfiable [as 别名]
def test_inline_strncmp():
    l.info("symbolic left, symbolic right, symbolic len")
    s = SimState(arch="AMD64", mode="symbolic")
    left = s.BV("left", 32)
    left_addr = s.se.BitVecVal(0x1000, 64)
    right = s.BV("right", 32)
    right_addr = s.se.BitVecVal(0x2000, 64)
    maxlen = s.BV("len", 64)

    s.memory.store(left_addr, left)
    s.memory.store(right_addr, right)

    s.add_constraints(strlen(s, inline=True, arguments=[left_addr]).ret_expr == 3)
    s.add_constraints(strlen(s, inline=True, arguments=[right_addr]).ret_expr == 0)

    s.add_constraints(maxlen != 0)
    c = strncmp(s, inline=True, arguments=[left_addr, right_addr, maxlen]).ret_expr

    s_match = s.copy()
    s_match.add_constraints(c == 0)
    nose.tools.assert_false(s_match.satisfiable())
    # nose.tools.assert_equals(s_match.se.min_int(maxlen), 3)

    s_nomatch = s.copy()
    s_nomatch.add_constraints(c != 0)
    nose.tools.assert_true(s_nomatch.satisfiable())
    # nose.tools.assert_equals(s_nomatch.se.max_int(maxlen), 2)

    l.info("zero-length")
    s = SimState(arch="AMD64", mode="symbolic")
    left = s.BV("left", 32)
    left_addr = s.se.BitVecVal(0x1000, 64)
    right = s.BV("right", 32)
    right_addr = s.se.BitVecVal(0x2000, 64)
    maxlen = s.BV("len", 64)
    left_len = strlen(s, inline=True, arguments=[left_addr]).ret_expr
    right_len = strlen(s, inline=True, arguments=[right_addr]).ret_expr
    c = strncmp(s, inline=True, arguments=[left_addr, right_addr, maxlen]).ret_expr

    s.add_constraints(right_len == 0)
    s.add_constraints(left_len == 0)
    # s.add_constraints(c == 0)
    s.add_constraints(maxlen == 0)
    nose.tools.assert_true(s.satisfiable())

# 需要导入模块: from simuvex import SimState [as 别名]
# 或者: from simuvex.SimState import satisfiable [as 别名]
def test_strstr_inconsistency(n=2):
    l.info("symbolic haystack, symbolic needle")
    s = SimState(arch="AMD64", mode="symbolic")
    s.libc.buf_symbolic_bytes = n
    addr_haystack = s.se.BitVecVal(0x10, 64)
    addr_needle = s.se.BitVecVal(0xB0, 64)
    # len_needle = strlen(s, inline=True, arguments=[addr_needle])

    ss_res = strstr(s, inline=True, arguments=[addr_haystack, addr_needle]).ret_expr

    # slh_res = strlen(s, inline=True, arguments=[addr_haystack]).ret_expr
    # sln_res = strlen(s, inline=True, arguments=[addr_needle]).ret_expr
    # print "LENH:", s.se.any_n_int(slh_res, 100)
    # print "LENN:", s.se.any_n_int(sln_res, 100)

    nose.tools.assert_false(s.se.unique(ss_res))
    nose.tools.assert_items_equal(s.se.any_n_int(ss_res, 100), [0] + range(0x10, 0x10 + s.libc.buf_symbolic_bytes - 1))

    s.add_constraints(ss_res != 0)
    ss2 = strstr(s, inline=True, arguments=[addr_haystack, addr_needle]).ret_expr
    s.add_constraints(ss2 == 0)
    nose.tools.assert_false(s.satisfiable())

# 需要导入模块: from simuvex import SimState [as 别名]
# 或者: from simuvex.SimState import satisfiable [as 别名]
def broken_symbolic_write():
    s = SimState(arch='AMD64', mode='symbolic')

    addr = s.se.BVS('addr', 64)
    s.add_constraints(s.se.Or(addr == 10, addr == 20, addr == 30))
    nose.tools.assert_equals(len(s.se.any_n_int(addr, 10)), 3)

    s.memory.store(10, s.se.BVV(1, 8))
    s.memory.store(20, s.se.BVV(2, 8))
    s.memory.store(30, s.se.BVV(3, 8))

    nose.tools.assert_true(s.se.unique(s.memory.load(10, 1)))
    nose.tools.assert_true(s.se.unique(s.memory.load(20, 1)))
    nose.tools.assert_true(s.se.unique(s.memory.load(30, 1)))

    #print "CONSTRAINTS BEFORE:", s.constraints._solver.constraints
    #s.memory.store(addr, s.se.BVV(255, 8), strategy=['symbolic','any'], limit=100)
    s.memory.store(addr, s.se.BVV(255, 8))
    nose.tools.assert_true(s.satisfiable())
    print "GO TIME"
    nose.tools.assert_equals(len(s.se.any_n_int(addr, 10)), 3)
    nose.tools.assert_items_equal(s.se.any_n_int(s.memory.load(10, 1), 3), [ 1, 255 ])
    nose.tools.assert_items_equal(s.se.any_n_int(s.memory.load(20, 1), 3), [ 2, 255 ])
    nose.tools.assert_items_equal(s.se.any_n_int(s.memory.load(30, 1), 3), [ 3, 255 ])
    nose.tools.assert_equals(len(s.se.any_n_int(addr, 10)), 3)

    # see if it works when constraining the write address
    sa = s.copy()
    sa.add_constraints(addr == 20)
    nose.tools.assert_true(sa.satisfiable())
    nose.tools.assert_items_equal(sa.se.any_n_int(sa.memory.load(10, 1), 3), [ 1 ])
    nose.tools.assert_items_equal(sa.se.any_n_int(sa.memory.load(20, 1), 3), [ 255 ])
    nose.tools.assert_items_equal(sa.se.any_n_int(sa.memory.load(30, 1), 3), [ 3 ])
    nose.tools.assert_items_equal(sa.se.any_n_int(addr, 10), [ 20 ])

    # see if it works when constraining a value to the written one
    sv = s.copy()
    sv.add_constraints(sv.memory.load(30, 1) == 255)
    nose.tools.assert_true(sv.satisfiable())
    nose.tools.assert_items_equal(sv.se.any_n_int(sv.memory.load(10, 1), 3), [ 1 ])
    nose.tools.assert_items_equal(sv.se.any_n_int(sv.memory.load(20, 1), 3), [ 2 ])
    nose.tools.assert_items_equal(sv.se.any_n_int(sv.memory.load(30, 1), 3), [ 255 ])
    nose.tools.assert_items_equal(sv.se.any_n_int(addr, 10), [ 30 ])

    # see if it works when constraining a value to the unwritten one
    sv = s.copy()
    sv.add_constraints(sv.memory.load(30, 1) == 3)
    nose.tools.assert_true(sv.satisfiable())
    nose.tools.assert_items_equal(sv.se.any_n_int(sv.memory.load(10, 1), 3), [ 1, 255 ])
    nose.tools.assert_items_equal(sv.se.any_n_int(sv.memory.load(20, 1), 3), [ 2, 255 ])
    nose.tools.assert_items_equal(sv.se.any_n_int(sv.memory.load(30, 1), 3), [ 3 ])
    nose.tools.assert_items_equal(sv.se.any_n_int(addr, 10), [ 10, 20 ])

    s = SimState(arch='AMD64', mode='symbolic')
    s.memory.store(0, s.se.BVV(0x4141414141414141, 64))
    length = s.se.BVS("length", 32)
    #s.memory.store(0, s.se.BVV(0x4242424242424242, 64), symbolic_length=length)
    s.memory.store(0, s.se.BVV(0x4242424242424242, 64))

    for i in range(8):
        ss = s.copy()
        ss.add_constraints(length == i)
        nose.tools.assert_equal(ss.se.any_str(s.memory.load(0, 8)), "B"*i + "A"*(8-i))

    print "GROOVY"

# 需要导入模块: from simuvex import SimState [as 别名]
# 或者: from simuvex.SimState import satisfiable [as 别名]
def test_strncpy():
    l.info("concrete src, concrete dst, concrete len")
    l.debug("... full copy")
    s = SimState(arch="AMD64", mode="symbolic")
    dst = s.se.BitVecVal(0x41414100, 32)
    dst_addr = s.se.BitVecVal(0x1000, 64)
    src = s.se.BitVecVal(0x42420000, 32)
    src_addr = s.se.BitVecVal(0x2000, 64)

    s.memory.store(dst_addr, dst)
    s.memory.store(src_addr, src)
    strncpy(s, inline=True, arguments=[dst_addr, src_addr, s.se.BitVecVal(3, 64)])
    new_dst = s.memory.load(dst_addr, 4, endness="Iend_BE")
    nose.tools.assert_equal(s.se.any_str(new_dst), "BB\x00\x00")

    l.debug("... partial copy")
    s = SimState(arch="AMD64", mode="symbolic")
    s.memory.store(dst_addr, dst)
    s.memory.store(src_addr, src)
    strncpy(s, inline=True, arguments=[dst_addr, src_addr, s.se.BitVecVal(2, 64)])
    new_dst = s.memory.load(dst_addr, 4, endness="Iend_BE")
    nose.tools.assert_equal(s.se.any_n_str(new_dst, 2), ["BBA\x00"])

    l.info("symbolic src, concrete dst, concrete len")
    s = SimState(arch="AMD64", mode="symbolic")
    dst = s.se.BitVecVal(0x41414100, 32)
    dst_addr = s.se.BitVecVal(0x1000, 64)
    src = s.BV("src", 32)
    src_addr = s.se.BitVecVal(0x2000, 64)

    s.memory.store(dst_addr, dst)
    s.memory.store(src_addr, src)

    # make sure it copies it all
    s.add_constraints(strlen(s, inline=True, arguments=[src_addr]).ret_expr == 2)

    # sanity check
    s_false = s.copy()
    s_false.add_constraints(strlen(s_false, inline=True, arguments=[src_addr]).ret_expr == 3)
    nose.tools.assert_false(s_false.satisfiable())

    strncpy(s, inline=True, arguments=[dst_addr, src_addr, 3])
    nose.tools.assert_true(s.satisfiable())
    c = strcmp(s, inline=True, arguments=[dst_addr, src_addr]).ret_expr

    nose.tools.assert_items_equal(s.se.any_n_int(c, 10), [0])

    l.info("symbolic src, concrete dst, symbolic len")
    s = SimState(arch="AMD64", mode="symbolic")
    dst = s.se.BitVecVal(0x41414100, 32)
    dst_addr = s.se.BitVecVal(0x1000, 64)
    src = s.BV("src", 32)
    src_addr = s.se.BitVecVal(0x2000, 64)
    maxlen = s.BV("len", 64)

    s.memory.store(dst_addr, dst)
    s.memory.store(src_addr, src)

    # make sure it copies it all
    s.add_constraints(strlen(s, inline=True, arguments=[src_addr]).ret_expr == 2)
    strncpy(s, inline=True, arguments=[dst_addr, src_addr, maxlen])
    c = strcmp(s, inline=True, arguments=[dst_addr, src_addr]).ret_expr

    s_match = s.copy()
    s_match.add_constraints(c == 0)
    nose.tools.assert_equals(s_match.se.min_int(maxlen), 3)

    s_nomatch = s.copy()
    s_nomatch.add_constraints(c != 0)
    nose.tools.assert_equals(s_nomatch.se.max_int(maxlen), 2)

    l.info("concrete src, concrete dst, symbolic len")
    l.debug("... full copy")
    s = SimState(arch="AMD64", mode="symbolic")

    dst = s.se.BitVecVal(0x41414100, 32)
    dst_addr = s.se.BitVecVal(0x1000, 64)
    src = s.se.BitVecVal(0x42420000, 32)
    src_addr = s.se.BitVecVal(0x2000, 64)
    maxlen = s.BV("len", 64)

    s.memory.store(dst_addr, dst)
    s.memory.store(src_addr, src)
    strncpy(s, inline=True, arguments=[dst_addr, src_addr, maxlen])
    r = s.memory.load(dst_addr, 4, endness="Iend_BE")
    # print repr(r.se.any_n_str(10))
    nose.tools.assert_items_equal(s.se.any_n_str(r, 10), ["AAA\x00", "BAA\x00", "BBA\x00", "BB\x00\x00"])

# 需要导入模块: from simuvex import SimState [as 别名]
# 或者: from simuvex.SimState import satisfiable [as 别名]
def test_memcmp():
    l.info("concrete src, concrete dst, concrete len")

    l.debug("... full cmp")
    s = SimState(arch="AMD64", mode="symbolic")
    dst = s.se.BitVecVal(0x41414141, 32)
    dst_addr = s.se.BitVecVal(0x1000, 64)
    src = s.se.BitVecVal(0x42424242, 32)
    src_addr = s.se.BitVecVal(0x2000, 64)
    s.memory.store(dst_addr, dst)
    s.memory.store(src_addr, src)
    r = memcmp(s, inline=True, arguments=[dst_addr, src_addr, s.BVV(4, 64)]).ret_expr
    nose.tools.assert_true(s.satisfiable())

    s_pos = s.copy()
    s_pos.add_constraints(r.SGE(0))
    nose.tools.assert_false(s_pos.satisfiable())

    s_neg = s.copy()
    s_neg.add_constraints(r.SLT(0))
    nose.tools.assert_true(s_neg.satisfiable())

    l.debug("... zero cmp")
    s = SimState(arch="AMD64", mode="symbolic")
    s.memory.store(dst_addr, dst)
    s.memory.store(src_addr, src)
    r = memcmp(s, inline=True, arguments=[dst_addr, src_addr, s.se.BitVecVal(0, 64)]).ret_expr
    nose.tools.assert_equals(s.se.any_n_int(r, 2), [0])

    l.info("symbolic src, concrete dst, concrete len")
    s = SimState(arch="AMD64", mode="symbolic")
    dst = s.se.BitVecVal(0x41414141, 32)
    dst_addr = s.se.BitVecVal(0x1000, 64)
    src = s.BV("src", 32)

    src_addr = s.se.BitVecVal(0x2000, 64)

    s.memory.store(dst_addr, dst)
    s.memory.store(src_addr, src)

    # make sure it copies it all
    r = memcmp(s, inline=True, arguments=[dst_addr, src_addr, s.se.BitVecVal(4, 64)]).ret_expr

    s_match = s.copy()
    s_match.add_constraints(r == 0)
    m = s_match.memory.load(src_addr, 4)
    nose.tools.assert_equal(s_match.se.any_n_int(m, 2), [0x41414141])

    s_nomatch = s.copy()
    s_nomatch.add_constraints(r != 0)
    m = s_nomatch.memory.load(src_addr, 4)
    nose.tools.assert_false(s_nomatch.se.solution(m, 0x41414141))

    l.info("symbolic src, concrete dst, symbolic len")
    s = SimState(arch="AMD64", mode="symbolic")
    dst = s.se.BitVecVal(0x41414141, 32)
    dst_addr = s.se.BitVecVal(0x1000, 64)
    src = s.BV("src", 32)
    src_addr = s.se.BitVecVal(0x2000, 64)
    cmplen = s.BV("len", 64)

    s.memory.store(dst_addr, dst)
    s.memory.store(src_addr, src)
    r = memcmp(s, inline=True, arguments=[dst_addr, src_addr, cmplen]).ret_expr

    # look at effects of different lengths
    s1 = s.copy()
    s1.add_constraints(cmplen == 1)
    s1.add_constraints(r == 0)
    l.debug("... simplifying")
    s1.se._solver.simplify()
    l.debug("... solving")
    nose.tools.assert_equals(s1.se.any_n_int(src[31:24], 2), [0x41])
    nose.tools.assert_false(s1.se.unique(src[31:16]))
    l.debug("... solved")

    s2 = s.copy()
    s2.add_constraints(cmplen == 2)
    s2.add_constraints(r == 0)
    nose.tools.assert_equals(s2.se.any_n_int(s2.memory.load(src_addr, 2), 2), [0x4141])
    nose.tools.assert_false(s2.se.unique(s2.memory.load(src_addr, 3)))

    s2u = s.copy()
    s2u.add_constraints(cmplen == 2)
    s2u.add_constraints(r == 1)
    nose.tools.assert_false(s2u.se.solution(s2u.memory.load(src_addr, 2), 0x4141))

# 需要导入模块: from simuvex import SimState [as 别名]
# 或者: from simuvex.SimState import satisfiable [as 别名]
def test_memcpy():
    l.info("concrete src, concrete dst, concrete len")
    l.debug("... full copy")
    s = SimState(arch="AMD64", mode="symbolic")
    dst = s.se.BitVecVal(0x41414141, 32)
    dst_addr = s.se.BitVecVal(0x1000, 64)
    src = s.se.BitVecVal(0x42424242, 32)
    src_addr = s.se.BitVecVal(0x2000, 64)

    s.memory.store(dst_addr, dst)
    s.memory.store(src_addr, src)
    memcpy(s, inline=True, arguments=[dst_addr, src_addr, s.se.BitVecVal(4, 64)])
    new_dst = s.memory.load(dst_addr, 4, endness="Iend_BE")
    nose.tools.assert_equal(s.se.any_n_str(new_dst, 2), ["BBBB"])

    l.debug("... partial copy")
    s = SimState(arch="AMD64", mode="symbolic")
    s.memory.store(dst_addr, dst)
    s.memory.store(src_addr, src)
    memcpy(s, inline=True, arguments=[dst_addr, src_addr, s.se.BitVecVal(2, 64)])
    new_dst = s.memory.load(dst_addr, 4, endness="Iend_BE")
    nose.tools.assert_equal(s.se.any_n_str(new_dst, 2), ["BBAA"])

    l.info("symbolic src, concrete dst, concrete len")
    s = SimState(arch="AMD64", mode="symbolic")
    dst = s.se.BitVecVal(0x41414141, 32)
    dst_addr = s.se.BitVecVal(0x1000, 64)
    src = s.BV("src", 32)
    src_addr = s.se.BitVecVal(0x2000, 64)

    s.memory.store(dst_addr, dst)
    s.memory.store(src_addr, src)

    # make sure it copies it all
    memcpy(s, inline=True, arguments=[dst_addr, src_addr, s.se.BitVecVal(4, 64)])
    nose.tools.assert_true(s.satisfiable())
    s.add_constraints(src != s.memory.load(dst_addr, 4))
    nose.tools.assert_false(s.satisfiable())

    l.info("symbolic src, concrete dst, symbolic len")
    s = SimState(arch="AMD64", mode="symbolic")
    dst = s.se.BitVecVal(0x41414141, 32)
    dst_addr = s.se.BitVecVal(0x1000, 64)
    src = s.BV("src", 32)
    src_addr = s.se.BitVecVal(0x2000, 64)
    cpylen = s.BV("len", 64)

    s.memory.store(dst_addr, dst)
    s.memory.store(src_addr, src)
    memcpy(s, inline=True, arguments=[dst_addr, src_addr, cpylen])
    result = s.memory.load(dst_addr, 4, endness="Iend_BE")

    # make sure it copies it all
    s1 = s.copy()
    s1.add_constraints(cpylen == 1)
    nose.tools.assert_true(s1.se.unique(s1.memory.load(dst_addr + 1, 3)))
    nose.tools.assert_equals(len(s1.se.any_n_int(s1.memory.load(dst_addr, 1), 300)), 256)

    s2 = s.copy()
    s2.add_constraints(cpylen == 2)
    nose.tools.assert_equals(len(s2.se.any_n_int(result[31:24], 300)), 256)
    nose.tools.assert_equals(len(s2.se.any_n_int(result[23:16], 300)), 256)
    nose.tools.assert_equals(s2.se.any_n_str(result[15:0], 300), ["AA"])

    l.info("concrete src, concrete dst, symbolic len")
    dst = s2.se.BitVecVal(0x41414141, 32)
    dst_addr = s2.se.BitVecVal(0x1000, 64)
    src = s2.se.BitVecVal(0x42424242, 32)
    src_addr = s2.se.BitVecVal(0x2000, 64)

    s = SimState(arch="AMD64", mode="symbolic")
    s.memory.store(dst_addr, dst)
    s.memory.store(src_addr, src)
    cpylen = s.BV("len", 64)

    s.add_constraints(s.se.ULE(cpylen, 4))
    memcpy(s, inline=True, arguments=[dst_addr, src_addr, cpylen])
    new_dst = s.memory.load(dst_addr, 4, endness="Iend_BE")
    nose.tools.assert_items_equal(s.se.any_n_str(new_dst, 300), ["AAAA", "BAAA", "BBAA", "BBBA", "BBBB"])

# 需要导入模块: from simuvex import SimState [as 别名]
# 或者: from simuvex.SimState import satisfiable [as 别名]
def test_memcpy():
    l.info("concrete src, concrete dst, concrete len")
    l.debug("... full copy")
    s = SimState(arch="AMD64", mode="symbolic")
    dst = s.se.BVV(0x41414141, 32)
    dst_addr = s.se.BVV(0x1000, 64)
    src = s.se.BVV(0x42424242, 32)
    src_addr = s.se.BVV(0x2000, 64)

    s.memory.store(dst_addr, dst)
    s.memory.store(src_addr, src)
    memcpy(s, inline=True, arguments=[dst_addr, src_addr, s.se.BVV(4, 64)])
    new_dst = s.memory.load(dst_addr, 4, endness='Iend_BE')
    nose.tools.assert_equal(s.se.any_n_str(new_dst, 2), [ "BBBB" ])

    l.info("giant copy")
    s = SimState(arch="AMD64", mode="symbolic", remove_options=simuvex.o.simplification)
    s.memory._maximum_symbolic_size = 0x2000000
    size = s.se.BVV(0x1000000, 64)
    dst_addr = s.se.BVV(0x2000000, 64)
    src_addr = s.se.BVV(0x4000000, 64)

    memcpy(s, inline=True, arguments=[dst_addr, src_addr, size])
    nose.tools.assert_is(s.memory.load(dst_addr, size), s.memory.load(src_addr, size))

    l.debug("... partial copy")
    s = SimState(arch="AMD64", mode="symbolic")
    s.memory.store(dst_addr, dst)
    s.memory.store(src_addr, src)
    memcpy(s, inline=True, arguments=[dst_addr, src_addr, s.se.BVV(2, 64)])
    new_dst = s.memory.load(dst_addr, 4, endness='Iend_BE')
    nose.tools.assert_equal(s.se.any_n_str(new_dst, 2), [ "BBAA" ])

    l.info("symbolic src, concrete dst, concrete len")
    s = SimState(arch="AMD64", mode="symbolic")
    dst = s.se.BVV(0x41414141, 32)
    dst_addr = s.se.BVV(0x1000, 64)
    src = s.se.BVS("src", 32)
    src_addr = s.se.BVV(0x2000, 64)

    s.memory.store(dst_addr, dst)
    s.memory.store(src_addr, src)

    # make sure it copies it all
    memcpy(s, inline=True, arguments=[dst_addr, src_addr, s.se.BVV(4, 64)])
    nose.tools.assert_true(s.satisfiable())
    s.add_constraints(src != s.memory.load(dst_addr, 4))
    nose.tools.assert_false(s.satisfiable())

    l.info("symbolic src, concrete dst, symbolic len")
    s = SimState(arch="AMD64", mode="symbolic")
    dst = s.se.BVV(0x41414141, 32)
    dst_addr = s.se.BVV(0x1000, 64)
    src = s.se.BVS("src", 32)
    src_addr = s.se.BVV(0x2000, 64)
    cpylen = s.se.BVS("len", 64)

    s.memory.store(dst_addr, dst)
    s.memory.store(src_addr, src)
    memcpy(s, inline=True, arguments=[dst_addr, src_addr, cpylen])
    result = s.memory.load(dst_addr, 4, endness='Iend_BE')

    # make sure it copies it all
    s1 = s.copy()
    s1.add_constraints(cpylen == 1)
    nose.tools.assert_true(s1.se.unique(s1.memory.load(dst_addr+1, 3)))
    nose.tools.assert_equals(len(s1.se.any_n_int(s1.memory.load(dst_addr, 1), 300)), 256)

    s2 = s.copy()
    s2.add_constraints(cpylen == 2)
    nose.tools.assert_equals(len(s2.se.any_n_int(result[31:24], 300)), 256)
    nose.tools.assert_equals(len(s2.se.any_n_int(result[23:16], 300)), 256)
    nose.tools.assert_equals(s2.se.any_n_str(result[15:0], 300), [ 'AA' ])

    l.info("concrete src, concrete dst, symbolic len")
    dst = s2.se.BVV(0x41414141, 32)
    dst_addr = s2.se.BVV(0x1000, 64)
    src = s2.se.BVV(0x42424242, 32)
    src_addr = s2.se.BVV(0x2000, 64)

    s = SimState(arch="AMD64", mode="symbolic")
    s.memory.store(dst_addr, dst)
    s.memory.store(src_addr, src)
    cpylen = s.se.BVS("len", 64)

    s.add_constraints(s.se.ULE(cpylen, 4))
    memcpy(s, inline=True, arguments=[dst_addr, src_addr, cpylen])
    new_dst = s.memory.load(dst_addr, 4, endness='Iend_BE')
    nose.tools.assert_items_equal(s.se.any_n_str(new_dst, 300), [ 'AAAA', 'BAAA', 'BBAA', 'BBBA', 'BBBB' ])