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So since this has clearly been a known concern with ldd for ages, it's intriguing to me that a) I've never even heard of it and b) it looks simple to patch ldd to avoid this vector.
True, it's not a security exploit. It is, however, unexpected behaviour, at least to some of us, and as Peteris points out can be a useful rung on a privilege-escalation ladder.
Anyone feel like submitting a patch upstream?
-- Thomas
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