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Avoiding integer overflow
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David McCombs
Ranch Hand
Joined: Oct 17, 2006
Posts: 212
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I have been taking a secure coding class this winter and one of the topics is integer overflows. A post by Jim Yingst yesterday
brought up this issues.
It seems that Java ignores this problem, is there any way to avoid this, especially using mathematical operations?
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"Should array indices start at 0 or 1? My compromise of 0.5 was rejected without, I thought, proper consideration."- Stan Kelly-Bootle
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Keith Lynn
Ranch Hand
Joined: Feb 07, 2005
Posts: 2341
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You can use BigInteger. But I'm not sure if there's an easy way to detect overflow if your using numerical types.
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David McCombs
Ranch Hand
Joined: Oct 17, 2006
Posts: 212
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Thanks, that is what I thought.
It seems odd that a language that focused on eliminating some of the problems of the past(i.e. buffer overflows) would not implement protection against integer overflow.
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marc weber
Sheriff
Joined: Aug 31, 2004
Posts: 11343
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Originally posted by David McCombs: ...A post by Jim Yingst yesterday brought up this issues...
Yeah, I'm a little embarrassed this never occurred to me. I know I've coded compareTo to return the difference without a second thought. (I'm pretty sure the numeric values I was using were always small, but now I have to lay awake nights wondering...)
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"We're kind of on the level of crossword puzzle writers... And no one ever goes to them and gives them an award." ~Joe Strummer
sscce.org
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subject: Avoiding integer overflow
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