** Changed in: ubuntu-power-systems
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1978129
Title:
Incomplete support for DT_RELR relocations on Ubuntu 22.04
Status in The Ubuntu-power-systems project:
Fix Committed
Status in binutils package in Ubuntu:
Fix Released
Status in binutils source package in Jammy:
Fix Committed
Status in binutils source package in Kinetic:
Fix Released
Bug description:
SRU Justification:
==================
[Impact]
* The latest glibc uses DT_RELR relocations,
but it turned out that the linker support is still incomplete,
as of binutils-2.38-3ubuntu1 on Ubuntu 22.04.
* It lacks the fix/commit 'PowerPC64 DT_RELR relative reloc
addresses'.
* As discussed at the binutils mailing list:
https://sourceware.org/pipermail/binutils/2022-March/119921.html
this fixes several (glibc) regressions (from 574 to 17).
* Instead of stashing r_offset final address calculations in
ppc64_elf_size_stubs for use by ppc64_elf_build_stubs,
section/offset pairs need to be kept.
[Test Plan]
* Build and run the official (make) check:
git clone git://sourceware.org/git/glibc.git
mkdir build && cd build
../glibc/configure --prefix=/usr && make -j8 && make check
[Where problems could occur]
* In case relr_addr is not replaced everywhere it's deletion in
elf64-ppc.c can cause problems, which will mainly occur at build time.
* The relr section/offset array may lead to problems if the array is not
properly handled or used.
* The rewrite of append_relr_off may cause issues due to wrong allocs
erroneous pointer arithmetic or array handling.
* The entirely new sort_relr function may introduce new code issues
or performance issues.
* The adjustments of ppc64_elf_size_stubs and ppc64_elf_build_stubs to
the new relr code could be done wrong
in which case the linker support is still not working.
* But the patch was discussed at the upstream mailing list:
https://sourceware.org/pipermail/binutils/2022-March/thread.html#119921
* and is limited to ppc, and even to file 'elf64-ppc.c'.
__________
== Comment: #0 - Matheus Salgueiro Castanho <mscasta...@ibm.com> - 2022-06-09
09:32:29 ==
---Problem Description---
Latest glibc uses DT_RELR relocations, but linker support is incomplete as of
binutils-2.38-3ubuntu1 on Ubuntu 22.04. It lacks the following fix integrated
into the upstream 2.38 branch:
PowerPC64 DT_RELR relative reloc addresses
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=e4a35c7319628045302d4c597cb27f1b0a08c858
As mentioned in the binutils mailing list when this patch was discussed, this
fixes several glibc regressions:
https://sourceware.org/pipermail/binutils/2022-March/119921.html
Contact Information = Matheus Castanho/mscasta...@ibm.com
---uname output---
N/A
Machine Type = N/A
---Debugger---
A debugger is not configured
---Steps to Reproduce---
git clone git://sourceware.org/git/glibc.git
mkdir build && cd build
../glibc/configure --prefix=/usr && make -j8 && make check
Userspace tool common name: binutils
The userspace tool has the following bit modes: 64-bit
Userspace rpm: binutils
Userspace tool obtained from project website: na
*Additional Instructions for Matheus Castanho/mscasta...@ibm.com:
-Attach ltrace and strace of userspace application.
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