[pacman-dev] [PATCH] add support for PIE to makepkg
danielmicay at gmail.com
Tue Jul 22 15:35:26 EDT 2014
On 22/07/14 05:01 AM, Allan McRae wrote:
> On 22/07/14 07:41, Daniel Micay wrote:
>> A `pie` option is added for wrapping C and C++ compilers and passing the
>> correct options for building position independent executables. PIE is
>> required for full address space layout optimization (ASLR) and there is
>> little to no benefit from ASLR without it since global ELF tables
>> (GOT/PLT) and application code are at known locations.
>> A wrapper script is required in order to pass the correct flags for
>> executables without changing the flags for libraries. It adds `-pie`
>> when linking (no `-c` switch) if `-static` or `-shared` are not passed,
>> and `-fPIE` whenever `-fPIC` is not already there. This technique comes
>> from the Debian hardening wrappers.
>> Position independent code is expensive on i686, so it's only enabled by
>> default on x86_64 where the cost is negligible. It can be enabled on a
>> package-by-package basis on i686. The same cost already exists for any
>> code in a dynamic library.
> Why should this be in makepkg? Just like Debian this should be a
> distribution build system integration rather than in the package manager.
I'll add a pie-wrapper package to [community] and ask for it to be
included in base-devel on arch-dev-public instead of this.
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