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Re: cannot restore segment prot after reloc

From: Jim Wilson
Subject: Re: cannot restore segment prot after reloc
Date: Tue, 11 Mar 2008 21:50:08 -0700
User-agent: Thunderbird (X11/20080226)

Paul Turner wrote:
What does this mean "cannot restore segment prot after reloc?

The message is from the dynamic linker, which is part of glibc. See the glibc file elf/dl-reloc.c.

It means that you have a read-only section (like text) that contains relocs that require modifying the read-only section. This requires a mprotect call before we can modify it, and a second mprotect call after the fact to make the section read-only again after we change it. The second mprotect call failed.

Of course, if you have a proper shared library, you should not have any relocs against the text section. Maybe you forgot to compile something as PIC?


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