linux-kernel - [PATCH AUTOSEL 5.8 20/24] riscv: Fixup bootup failure with HARDENED

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Message-Id: <20201012190239.3279198-20-sashal@kernel.org>
Date:   Mon, 12 Oct 2020 15:02:35 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Guo Ren <guoren@...ux.alibaba.com>,
        Aurelien Jarno <aurelien@...el32.net>,
        Palmer Dabbelt <palmerdabbelt@...gle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH AUTOSEL 5.8 20/24] riscv: Fixup bootup failure with HARDENED_USERCOPY

From: Guo Ren <guoren@...ux.alibaba.com>

[ Upstream commit 84814460eef9af0fb56a4698341c9cb7996a6312 ]

6184358da000 ("riscv: Fixup static_obj() fail") attempted to elide a lockdep
failure by rearranging our kernel image to place all initdata within [_stext,
_end], thus triggering lockdep to treat these as static objects.  These objects
are released and eventually reallocated, causing check_kernel_text_object() to
trigger a BUG().

This backs out the change to make [_stext, _end] all-encompassing, instead just
moving initdata.  This results in initdata being outside of [__init_begin,
__init_end], which means initdata can't be freed.

Link: https://lore.kernel.org/linux-riscv/1593266228-61125-1-git-send-email-guoren@kernel.org/T/#t
Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
Reported-by: Aurelien Jarno <aurelien@...el32.net>
Tested-by: Aurelien Jarno <aurelien@...el32.net>
[Palmer: Clean up commit text]
Signed-off-by: Palmer Dabbelt <palmerdabbelt@...gle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/riscv/kernel/vmlinux.lds.S | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/kernel/vmlinux.lds.S b/arch/riscv/kernel/vmlinux.lds.S
index f3586e31ed1ec..34d00d9e6eac0 100644
--- a/arch/riscv/kernel/vmlinux.lds.S
+++ b/arch/riscv/kernel/vmlinux.lds.S
@@ -22,13 +22,11 @@ SECTIONS
 	/* Beginning of code and text segment */
 	. = LOAD_OFFSET;
 	_start = .;
-	_stext = .;
 	HEAD_TEXT_SECTION
 	. = ALIGN(PAGE_SIZE);
 
 	__init_begin = .;
 	INIT_TEXT_SECTION(PAGE_SIZE)
-	INIT_DATA_SECTION(16)
 	. = ALIGN(8);
 	__soc_early_init_table : {
 		__soc_early_init_table_start = .;
@@ -55,6 +53,7 @@ SECTIONS
 	. = ALIGN(SECTION_ALIGN);
 	.text : {
 		_text = .;
+		_stext = .;
 		TEXT_TEXT
 		SCHED_TEXT
 		CPUIDLE_TEXT
@@ -67,6 +66,8 @@ SECTIONS
 		_etext = .;
 	}
 
+	INIT_DATA_SECTION(16)
+
 	/* Start of data section */
 	_sdata = .;
 	RO_DATA(SECTION_ALIGN)
-- 
2.25.1