linux-kernel - [PATCH AUTOSEL 5.15 11/15] ARM: decompressor: Include .data.rel.ro.local

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Message-Id: <20221009205308.1202627-11-sashal@kernel.org>
Date:   Sun,  9 Oct 2022 16:53:04 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Kees Cook <keescook@...omium.org>,
        kernel test robot <lkp@...el.com>,
        Russell King <linux@...linux.org.uk>,
        linux-arm-kernel@...ts.infradead.org,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 5.15 11/15] ARM: decompressor: Include .data.rel.ro.local

From: Kees Cook <keescook@...omium.org>

[ Upstream commit 1b64daf413acd86c2c13f5443f6b4ef3690c8061 ]

The .data.rel.ro.local section has the same semantics as .data.rel.ro
here, so include it in the .rodata section of the decompressor.
Additionally since the .printk_index section isn't usable outside of
the core kernel, discard it in the decompressor. Avoids these warnings:

arm-linux-gnueabi-ld: warning: orphan section `.data.rel.ro.local' from `arch/arm/boot/compressed/fdt_rw.o' being placed in section `.data.rel.ro.local'
arm-linux-gnueabi-ld: warning: orphan section `.printk_index' from `arch/arm/boot/compressed/fdt_rw.o' being placed in section `.printk_index'

Reported-by: kernel test robot <lkp@...el.com>
Link: https://lore.kernel.org/linux-mm/202209080545.qMIVj7YM-lkp@intel.com
Cc: Russell King <linux@...linux.org.uk>
Cc: linux-arm-kernel@...ts.infradead.org
Signed-off-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/arm/boot/compressed/vmlinux.lds.S | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/boot/compressed/vmlinux.lds.S b/arch/arm/boot/compressed/vmlinux.lds.S
index 1bcb68ac4b01..3fcb3e62dc56 100644
--- a/arch/arm/boot/compressed/vmlinux.lds.S
+++ b/arch/arm/boot/compressed/vmlinux.lds.S
@@ -23,6 +23,7 @@ SECTIONS
     *(.ARM.extab*)
     *(.note.*)
     *(.rel.*)
+    *(.printk_index)
     /*
      * Discard any r/w data - this produces a link error if we have any,
      * which is required for PIC decompression.  Local data generates
@@ -57,6 +58,7 @@ SECTIONS
     *(.rodata)
     *(.rodata.*)
     *(.data.rel.ro)
+    *(.data.rel.ro.*)
   }
   .piggydata : {
     *(.piggydata)
-- 
2.35.1