Limit readline() #35
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Limit readline() #35
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This codemod hardens all
readline()calls from file objects returned from anopen()call,StringIOandBytesIOagainst denial of service attacks. A stream influenced by an attacker could keep providing bytes until the system runs out of memory, causing a crash.Fixing it is straightforward by providing adding a size argument to any
readline()calls.The changes from this codemod look like this:
file = open('some_file.txt') - file.readline() + file.readline(5_000_000)More reading
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