Bug 1582602 – ld should allow "lea foo@GOT, %ecx" [rhel-7.5.z]

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Bug 1582602 - ld should allow "lea foo@GOT, %ecx" [rhel-7.5.z]

Summary:	ld should allow "lea foo@GOT, %ecx" [rhel-7.5.z]

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 7
Classification:	Red Hat
Component:	binutils (Show other bugs)
Sub Component:
Version:	7.6
Hardware:	x86_64 Linux

Priority	high Severity medium
Target Milestone:	rc
Target Release:	---
Assigned To:	Nick Clifton
QA Contact:	Miloš Prchlík
Docs Contact:	Vladimír Slávik

URL:
Whiteboard:
Keywords:	ZStream

Depends On:	1573872
Blocks:
	Show dependency tree / graph

Reported:	2018-05-25 13:25 EDT by Oneata Mircea Teodor
Modified:	2018-06-26 12:52 EDT (History)
CC List:	12 users (show)

See Also:
Fixed In Version:	binutils-2.27-28.base.el7_5.1
Doc Type:	Bug Fix
Doc Text:	The "ld" linker based on the BFD library was too restrictive in its handling of a special form of the Load Effective Address (LEA) instruction in the AMD64 and Intel 64 architectures when building a shared library. As a consequence, the linker rejected valid code with an error message about an invalid relocation. The linker has been modified to handle addressing mode correctly. As a result, valid code that uses this instruction is accepted.
Story Points:	---
Clone Of:	1573872
Environment:
Last Closed:	2018-06-26 12:52:35 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Sourceware	21168	None	None	None	2018-05-25 13:26 EDT
Red Hat Knowledge Base (Solution)	3451312	None	None	None	2018-05-25 13:26 EDT
Red Hat Knowledge Base (Solution)	3452571	None	None	None	2018-05-25 13:26 EDT
Red Hat Product Errata	RHBA-2018:1994	None	None	None	2018-06-26 12:52 EDT

Groups: None (edit)

Description Oneata Mircea Teodor 2018-05-25 13:25:55 EDT

This bug has been copied from bug #1573872 and has been proposed to be backported to 7.5 z-stream (EUS).

Comment 8 Nick Clifton 2018-05-29 11:14:38 EDT

Update N-V-R to use correct z-stream syntax.

Comment 9 Miloš Prchlík 2018-06-05 02:51:46 EDT

Verified with build binutils-2.27-28.base.el7_5.1.x86_64, using the provided reproducer.

[root@sheep-30 ~]# gcc -B./ -m32 -c -o x.o x.S
[root@sheep-30 ~]# ld -melf_i386 -shared -o libx.so x.o
ld: x.o: direct GOT relocation R_386_GOT32 against `foo' without base register can not be used when making a shared object
ld: final link failed: Bad value
[root@sheep-30 ~]# 

vs.

[root@sheep-30 ~]# gcc -B./ -m32 -c -o x.o x.S
[root@sheep-30 ~]# ld -melf_i386 -shared -o libx.so x.o
[root@sheep-30 ~]#

Comment 14 errata-xmlrpc 2018-06-26 12:52:35 EDT

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:1994

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