linux-kernel - Re: [PATCH] riscv: uprobes: Restore thread.bad

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Date:   Fri, 5 May 2023 18:01:25 +0800
From:   Guo Ren <guoren@...nel.org>
To:     Tiezhu Yang <yangtiezhu@...ngson.cn>
Cc:     Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH] riscv: uprobes: Restore thread.bad_cause

Thx for fixup.

Reviewed-by: Guo Ren <guoren@...nel.org>

On Sun, Apr 23, 2023 at 9:42 AM Tiezhu Yang <yangtiezhu@...ngson.cn> wrote:
>
> thread.bad_cause is saved in arch_uprobe_pre_xol(), it should be restored
> in arch_uprobe_{post,abort}_xol() accordingly, otherwise the save operation
> is meaningless, this change is similar with x86 and powerpc.
>
> Signed-off-by: Tiezhu Yang <yangtiezhu@...ngson.cn>
> ---
>  arch/riscv/kernel/probes/uprobes.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/arch/riscv/kernel/probes/uprobes.c b/arch/riscv/kernel/probes/uprobes.c
> index c976a21..194f166 100644
> --- a/arch/riscv/kernel/probes/uprobes.c
> +++ b/arch/riscv/kernel/probes/uprobes.c
> @@ -67,6 +67,7 @@ int arch_uprobe_post_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
>         struct uprobe_task *utask = current->utask;
>
>         WARN_ON_ONCE(current->thread.bad_cause != UPROBE_TRAP_NR);
> +       current->thread.bad_cause = utask->autask.saved_cause;
>
>         instruction_pointer_set(regs, utask->vaddr + auprobe->insn_size);
>
> @@ -102,6 +103,7 @@ void arch_uprobe_abort_xol(struct arch_uprobe *auprobe, struct pt_regs *regs)
>  {
>         struct uprobe_task *utask = current->utask;
>
> +       current->thread.bad_cause = utask->autask.saved_cause;
>         /*
>          * Task has received a fatal signal, so reset back to probbed
>          * address.
> --
> 2.1.0
>


-- 
Best Regards
 Guo Ren