#7453: unsafe coerce without extensions
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Reporter: guest | Owner:
Type: bug | Status: new
Priority: normal | Component: Compiler (Type
checker)
Version: 7.6.1 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: GHC accepts invalid program | Blockedby:
Blocking: | Related:
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Comment(by ion1):
This has some security implications as well.
{{{
% mueval -e 'let unsafeCoerce v = z where z :: v; z = v where aux = const
v in (unsafeCoerce (putStrLn "evil IO action") :: () -> ()) ()'
evil IO action
()
}}}
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7453#comment:7>
GHC <http://www.haskell.org/ghc/>
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