From: Rich Felker <dalias@aerifal.cx>
Date: Wed, 8 Mar 2017 18:35:33 +0000 (-0500)
Subject: fix ld-behavior-dependent crash in ppc64 ldso startup
X-Git-Tag: v1.1.17~102
X-Git-Url: https://git.librecmc.org/?a=commitdiff_plain;h=fc85fb38605a8bf341c367b8ab0d36edab2bdbfc;p=oweals%2Fmusl.git

fix ld-behavior-dependent crash in ppc64 ldso startup

the 32-bit pc-relative address for stage 2 of dynamic linker entry was
wrongly loaded with a zero-extending load instead of sign-extending
load, resulting in an invalid jump if the offset happened to be
negative, which depends on the linker's ordering of text sections.
---

diff --git a/arch/powerpc64/reloc.h b/arch/powerpc64/reloc.h
index e1bad009..faf70acd 100644
--- a/arch/powerpc64/reloc.h
+++ b/arch/powerpc64/reloc.h
@@ -27,6 +27,6 @@
 	"	bl 1f \n" \
 	"	.long " #sym "-. \n" \
 	"1:	mflr %1 \n" \
-	"	lwz %0, 0(%1) \n" \
+	"	lwa %0, 0(%1) \n" \
 	"	add %0, %0, %1 \n" \
 	: "=r"(*(fp)), "=r"((long){0}) : : "memory", "lr" )