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[PATCH] [PR libc/18801] PIE binary with STT_GNU_IFUNC symbol and TEXTREL segfaults on x86_64

From: Sriraman Tallam <tmsriram at google dot com>
To: GLIBC Devel <libc-alpha at sourceware dot org>, Paul Pluzhnikov <ppluzhnikov at google dot com>, Ian Lance Taylor <iant at google dot com>, David Li <davidxl at google dot com>, "H.J. Lu" <hjl dot tools at gmail dot com>
Date: Tue, 11 Aug 2015 14:21:21 -0700
Subject: [PATCH] [PR libc/18801] PIE binary with STT_GNU_IFUNC symbol and TEXTREL segfaults on x86_64
Authentication-results: sourceware.org; auth=none

Details here:
https://sourceware.org/bugzilla/show_bug.cgi?id=18801

Thanks to Paul Pluzhnikov for identifying the problem and suggesting the fix.

PR 18801
* elf/dl-reloc.c (_dl_relocate_object):  Preserve the
original permissions when protecting the segment for writing it.
* sysdeps/x86_64/Makefile (ifunc-pie-txtrel-test): New test.
* sysdeps/x86_64/tst-pie-ifunc-txtrel.S: New file.

Patch attached.  Please review.

Thanks
Sri

Attachment: glibc_pie_ifunc_patch.txt
Description: Text document

Follow-Ups:
- Re: [PATCH] [PR libc/18801] PIE binary with STT_GNU_IFUNC symbol and TEXTREL segfaults on x86_64
  - From: Paul Pluzhnikov

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