Download Find the Bug A Book of Incorrect Programs by Adam Barr PDF

By Adam Barr

To capture a malicious program you might want to imagine like a trojan horse, and Barr (software programming supervisor) will get totally insectual. He provides useful pointers on going past the debuggers by way of strolling in the course of the code, completely knowing the code (all the code, together with C, Python, Java, Perl, and x86 meeting language) and dealing down the meals chain from the main more likely to the least most likely varmint that's unfastened on your or an individual else's paintings. He comprises classifications of insects, their common resources, and how you can tune their harm past the preliminary chew. Barr contains many examples and step by step methodologies.

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39. 54 if (source_ptr == source_end) done = 1; 55 40. *target_ptr = *source_ptr; 41. if (done) 42. break; 43. source_ptr += step; 44. target_ptr += step; 45. } 46. } Suggestions 1. Consider the local variable done. Where is it used? Is it used correctly? 2. The if on lines 21 and 22 is the heart of the algorithm. Is it correctly calculating whether the buffers overlap? 3. What are the empty, trivial, and already solved inputs to this program? 4. Does the comment on lines 15 19 match the code that follows?

2. The if on lines 21 and 22 is the heart of the algorithm. Is it correctly calculating whether the buffers overlap? 3. What are the empty, trivial, and already solved inputs to this program? 4. Does the comment on lines 15 19 match the code that follows? Hints Walk through the code with the following parameters to the function: 1. The most basic test is a non-overlapping copy. An array test_buffer[] contains 6 bytes: test_buffer[0] == 0x01 test_buffer[1] == 0x02 test_buffer[2] == 0x03 test_buffer[0] == 0x04 test_buffer[1] == 0x05 test_buffer[2] == 0x06 The function is called as follows: copy_memory(test_buffer, test_buffer+3, 3) 2.

Thus, the first span checked by the if on lines 21 22, with block_index equal to 0, won't be big enough: array_in_use[0] is 1, and blocks_needed is 2. Line 34 changes block_index to 1; on the second iteration of the while loop, the check on lines 21 22 is also false because array_in_use[1] is -1. The code to advance block_index on line 34, instead of changing it to 2 as it should, instead moves it back to 0. So, the while winds up looping forever as block_index ping-pongs between 0 and 1. < Day Day Up > < Day Day Up > 63 64 Memory Free This function frees memory allocated by the previous program.

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