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SubjectRe: [PATCH 1/2] Revert "riscv: Fixup static_obj() fail"
On Wed, Oct 7, 2020 at 8:09 AM <guoren@kernel.org> wrote:
>
> 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
>

Reviewed-by: Atish Patra <atish.patra@wdc.com>

--
Regards,
Atish

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