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Re: Read-only data in ELF libraries may be remapped writable at runtime (upcoming NDSS'17 paper)
On 12/23/2016 07:04 PM, Mathias Payer wrote:
At the linker level you likely don't know if the referenced symbol is RO
or not (as it could come from any object) -- only the runtime loader has
this knowledge and at that time it is too late as PIE uses relative
addressing inside the object.
The static linker necessarily sees a definition, otherwise it cannot
produce a copy relocation because copy relocations must refer to objects
of known size.
PS: The C++ example code inf figure 4(a) has a typo, the call to the method
b2 should probably be to b1.
Can you be more specific? I don't see a call to b2 in Fig. 4a
I meant a2.