From b09073e63138ce409bf6426cf820eeaa0d28ca74 Mon Sep 17 00:00:00 2001
From: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date: Mon, 5 Feb 2024 16:10:24 +0000
Subject: [PATCH] arm: Remove wrong ldr from _dl_start_user (BZ 31339)

The commit 49d877a80b29d3002887b084eec6676d9f5fec18 (arm: Remove
_dl_skip_args usage) removed the _SKIP_ARGS literal, which was
previously loader to r4 on loader _start.  However, the cleanup did not
remove the following 'ldr r4, [sl, r4]' on _dl_start_user, used to check
to skip the arguments after ld self-relocations.

In my testing, the kernel initially set r4 to 0, which makes the
ldr instruction just read the _GLOBAL_OFFSET_TABLE_.  However, since r4
is a callee-saved register; a different runtime might not zero
initialize it and thus trigger an invalid memory access.

Checked on arm-linux-gnu.

Reported-by: Adrian Ratiu <adrian.ratiu@collabora.com>
Reviewed-by: Szabolcs Nagy <szabolcs.nagy@arm.com>
(cherry picked from commit 1e25112dc0cb2515d27d8d178b1ecce778a9d37a)
---
 sysdeps/arm/dl-machine.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/sysdeps/arm/dl-machine.h b/sysdeps/arm/dl-machine.h
index d720c02c96..77dc7415e9 100644
--- a/sysdeps/arm/dl-machine.h
+++ b/sysdeps/arm/dl-machine.h
@@ -137,7 +137,6 @@ _start:\n\
 _dl_start_user:\n\
 	adr	r6, .L_GET_GOT\n\
 	add	sl, sl, r6\n\
-	ldr	r4, [sl, r4]\n\
 	@ save the entry point in another register\n\
 	mov	r6, r0\n\
 	@ get the original arg count\n\
-- 
2.33.0

