On 04.06.2017 15:21, Joerg Sonnenberger wrote: > On Sun, Jun 04, 2017 at 02:41:16PM +0200, Kamil Rytarowski wrote: >> There is a new code for RWX memory mapping with MAP_REMAPDUP. >> >> Is there a functionality to switch which mapping is in force? To >> manually switch between RW or RX? This would be useful for the W^X >> mechanism in firefox. >> >> https://jandemooij.nl/blog/2015/12/29/wx-jit-code-enabled-in-firefox/ > > Look at the libffi and t_mprotect changes. That basically cover the > normal ways to do this. > > Joerg > Does it mean that we need to perform duplication of a mapping for each switch RW - RX, and munmap(2) the old one?
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