Attachment 137711 Details for Bug 105303 – Python program to illustrate the kernel defuzz issue

Python program to illustrate the kernel defuzz issue

defuzz.py (text/plain), 1.06 KB, created by Peter Hutterer on 2018-03-01 06:02:24 UTC

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Creator: Peter Hutterer

Created: 2018-03-01 06:02:24 UTC

Size: 1.06 KB

patch

obsolete

>#!/usr/bin/python3
>
>def applyfuzz(val, old, fuzz):
>    if not fuzz:
>        return val
>
>    # within half of the fuzz range, return value
>    if val > old - fuzz/2 and val < old + fuzz/2:
>        return old
>
>    # within 0.5 to 1.0 times fuzz, return
>    if val > old - fuzz and val < old + fuzz:
>        return int((old * 3 + val)/4)
>
>    if val > old - fuzz * 2 and val < old + fuzz * 2:
>        return int((old + val)/2)
>
>    return val
>
>def defuzz(val, fuzz):
>    if val == 0:
>        return 0
>    if val < fuzz/2:
>        return val * 4 + 1
>    if val < fuzz:
>        return val * 2
>    else:
>        return val
>
>
>
>fuzz = 8
>old = 100
>
>for v in range(-fuzz * 3, fuzz * 3):
>    val = old + v
>    defuzzed = applyfuzz(val, old, fuzz)
>    dv = defuzz(defuzzed, fuzz)
>    #warning = '*' if val != 0 and v - dv > 3 else ''
>    print((f'value {val:-3d} old_val {old:-3d}: defuzzed: {defuzzed:-3d} '
>        f'delta {defuzzed - old:-3d}|{v:-3d} error: {val - defuzzed:-3d} '
>        #f'unfuzzed: {dv:-3d} error: {val - dv:-3d}'
>        ))
>
>    #defuzzed: {dv} error {v - dv} {warning}')

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