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Add support for full RELRO #43170

Merged
merged 5 commits into from Jul 19, 2017
Merged

Add support for full RELRO #43170

merged 5 commits into from Jul 19, 2017

Commits on Jul 11, 2017

  1. Add support for full RELRO 

    This commit adds support for full RELRO, and enables it for the
platforms I know have support for it.

Full RELRO makes the PLT+GOT data read-only on startup, preventing it
from being overwritten.

http://tk-blog.blogspot.com/2009/02/relro-not-so-well-known-memory.html

Fixes rust-lang#29877.

Signed-off-by: Johannes Löthberg <johannes@kyriasis.com>
    @kyrias
    kyrias committed Jul 11, 2017
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Commits on Jul 14, 2017

  1. Support both partial and full RELRO 

    Signed-off-by: Johannes Löthberg <johannes@kyriasis.com>
    @kyrias
    kyrias committed Jul 14, 2017
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  2. Make partial RELRO default on ppc64 due to segfault 

    On at least RHEL6 there is a segfault caused by the older ld.so version
when BIND_NOW is used, so use partial RELRO by default on ppc64
architectures for now.

Signed-off-by: Johannes Löthberg <johannes@kyriasis.com>
    @kyrias
    kyrias committed Jul 14, 2017
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Commits on Jul 17, 2017

  1. Move relro_level from CodegenOptions to DebuggingOptions 

    Signed-off-by: Johannes Löthberg <johannes@kyriasis.com>
    @kyrias
    kyrias committed Jul 17, 2017
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  2. Implement FromStr for RelroLevel rather than duplicating the match 

    Signed-off-by: Johannes Löthberg <johannes@kyriasis.com>
    @kyrias
    kyrias committed Jul 17, 2017
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