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SubjectRe: [PATCH] riscv: uprobes: Restore thread.bad_cause
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Date
Cc:
Oleg Nesterov <oleg@redhat.com>
Srikar Dronamraju <srikar@linux.vnet.ibm.com>

On 04/23/2023 09:42 AM, Tiezhu Yang 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@loongson.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.
>

Hi Oleg and Srikar,

Could you please review this patch, thank you.

Thanks,
Tiezhu

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