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  • Glasgow Haskell CompilerGlasgow Haskell Compiler
  • GHCGHC
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  • #14069
Closed
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Issue created Jul 31, 2017 by Ben Gamari@bgamari🐢Maintainer

RTS linker maps code as writable

GHC's RTS linker maps executable code in writable pages, representing a significant potential exploit point for arbitrary code execution. OpenBSD disallows running program that do this by default.

Instead we should first map pages as PROT_READ | PROT_WRITE, perform any necessary relocations (which requires writing), and then mprotect it to PROT_READ | PROT_EXEC.

To find the relevant code grep for PROT_EXEC in the rts/ directory.

Edited Mar 10, 2019 by Ben Gamari
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