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Re: Copy relocations against protected symbols
- From: Cary Coutant <ccoutant at google dot com>
- To: "H.J. Lu" <hjl dot tools at gmail dot com>, Binutils <binutils at sourceware dot org>
- Date: Thu, 18 Dec 2014 10:28:22 -0800
- Subject: Re: Copy relocations against protected symbols
- Authentication-results: sourceware.org; auth=none
- References: <20141212130509 dot GB23430 at bubble dot grove dot modra dot org> <CAMe9rOqmG2Qbn56kbndm3mZq5c5-fjdJs2mQNXj4GvzRTk3Ahw at mail dot gmail dot com> <20141215010749 dot GA8347 at bubble dot grove dot modra dot org> <CAMe9rOrT3Luw1TDi+Tw4Y=MEhe57wgxxzPNz+tNpp+HT_itBCg at mail dot gmail dot com> <20141218044500 dot GA23483 at bubble dot grove dot modra dot org>
> I doubt we'll find any clever solution. The linker defining a copy of
> a variable in .dynbss is quite at odds with protected visibility. For
> example, a protected visibility variable allows a compiler to generate
> shared library code that accesses the variable without a GOT
> indirection. However, it is exactly that GOT indirection that is
> needed for ld.so to make the shared library use the .dynbss copy.
Agreed. It looks like gold has the same problem; I'll commit a patch soon.