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From:   guoren@kernel.org
To:     palmerdabbelt@google.com
Cc:     linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
        atishp@atishpatra.org, schwab@linux-m68k.org, aurelien@aurel32.net,
        Guo Ren <guoren@linux.alibaba.com>
Subject: [PATCH 1/2] Revert "riscv: Fixup static_obj() fail"
Date:   Wed,  7 Oct 2020 15:08:32 +0000
Message-Id: <1602083313-19239-1-git-send-email-guoren@kernel.org>
Precedence: bulk

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

This reverts commit 6184358da0004c8fd940afda6c0a0fa4027dc911.

It will cause bootup failure with HARDENED_USERCOPY.

As Aurelien has reported:

[    3.484586] AppArmor: AppArmor sha1 policy hashing enabled
[    4.749835] Freeing unused kernel memory: 492K
[    4.752017] Run /init as init process
[    4.753571] usercopy: Kernel memory overwrite attempt detected to kernel text (offset 507879, size 11)!
[    4.754838] ------------[ cut here ]------------
[    4.755651] kernel BUG at mm/usercopy.c:99!
[    4.756445] Kernel BUG [#1]
[    4.756815] Modules linked in:
[    4.757542] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.8.0-1-riscv64 #1 Debian 5.8.7-1
[    4.758372] epc: ffffffe0003b5120 ra : ffffffe0003b5120 sp : ffffffe07f783ca0
[    4.758960]  gp : ffffffe000cc7230 tp : ffffffe07f77cec0 t0 : ffffffe000cdafc0
[    4.759772]  t1 : 0000000000000064 t2 : 0000000000000000 s0 : ffffffe07f783cf0
[    4.760534]  s1 : ffffffe00095d780 a0 : 000000000000005b a1 : 0000000000000020
[    4.761309]  a2 : 0000000000000005 a3 : 0000000000000000 a4 : ffffffe000c1f340
[    4.761848]  a5 : ffffffe000c1f340 a6 : 0000000000000000 a7 : 0000000000000087
[    4.762684]  s2 : ffffffe000941848 s3 : 000000000007bfe7 s4 : 000000000000000b
[    4.763500]  s5 : 0000000000000000 s6 : ffffffe00091cc00 s7 : fffffffffffff000
[    4.764376]  s8 : 0000003ffffff000 s9 : ffffffe0769f3200 s10: 000000000000000b
[    4.765208]  s11: ffffffe07d548c40 t3 : 0000000000000000 t4 : 000000000001dcd0
[    4.766059]  t5 : ffffffe000cc8510 t6 : ffffffe000cd64aa
[    4.766712] status: 0000000000000120 badaddr: 0000000000000000 cause: 0000000000000003
[    4.768308] ---[ end trace 1f8e733e834d4c3e ]---
[    4.769129] Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b
[    4.770070] SMP: stopping secondary CPUs
[    4.771110] ---[ end Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b ]---

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Reported-by: Aurelien Jarno <aurelien@aurel32.net>
Cc: Palmer Dabbelt <palmerdabbelt@google.com>
Cc: Atish Patra <atishp@atishpatra.org>
Cc: Andreas Schwab <schwab@linux-m68k.org>
---
 arch/riscv/kernel/vmlinux.lds.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/vmlinux.lds.S b/arch/riscv/kernel/vmlinux.lds.S
index f3586e3..e6f8016 100644
--- a/arch/riscv/kernel/vmlinux.lds.S
+++ b/arch/riscv/kernel/vmlinux.lds.S
@@ -22,7 +22,6 @@ SECTIONS
 	/* Beginning of code and text segment */
 	. = LOAD_OFFSET;
 	_start = .;
-	_stext = .;
 	HEAD_TEXT_SECTION
 	. = ALIGN(PAGE_SIZE);
 
@@ -55,6 +54,7 @@ SECTIONS
 	. = ALIGN(SECTION_ALIGN);
 	.text : {
 		_text = .;
+		_stext = .;
 		TEXT_TEXT
 		SCHED_TEXT
 		CPUIDLE_TEXT
-- 
2.7.4