[PATCH] riscv: uprobes: Restore thread.bad_cause

[PATCH] riscv: uprobes: Restore thread.bad_cause

[Tiezhu Yang]

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.
-- 
2.1.0


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Re: [PATCH] riscv: uprobes: Restore thread.bad_cause

[Tiezhu Yang]

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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Re: [PATCH] riscv: uprobes: Restore thread.bad_cause

[Oleg Nesterov]

On 04/24, Tiezhu Yang wrote:
>
> >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.
> >

Acked-by: Oleg Nesterov <oleg@redhat.com>


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Re: [PATCH] riscv: uprobes: Restore thread.bad_cause

[Guo Ren]

Thx for fixup.

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

On Sun, Apr 23, 2023 at 9:42 AM Tiezhu Yang <yangtiezhu@loongson.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@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.
> --
> 2.1.0
>


-- 
Best Regards
 Guo Ren

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Re: [PATCH] riscv: uprobes: Restore thread.bad_cause

[Tiezhu Yang]

ping, what is the status of this patch which has been received Acked-by
and Reviewed-by:

https://lore.kernel.org/linux-riscv/1682214146-3756-1-git-send-email-yangtiezhu@loongson.cn/

Thanks,
Tiezhu


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Re: [PATCH] riscv: uprobes: Restore thread.bad_cause

[Palmer Dabbelt]

On Sun, 23 Apr 2023 09:42:26 +0800, 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.
> 
> 

Applied, thanks!

[1/1] riscv: uprobes: Restore thread.bad_cause
      https://git.kernel.org/palmer/c/58b1294dd1d6

Best regards,
-- 
Palmer Dabbelt <palmer@rivosinc.com>


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Re: [PATCH] riscv: uprobes: Restore thread.bad_cause

[patchwork-bot+linux-riscv]

Hello:

This patch was applied to riscv/linux.git (for-next)
by Palmer Dabbelt <palmer@rivosinc.com>:

On Sun, 23 Apr 2023 09:42:26 +0800 you 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(+)

Here is the summary with links:
  - riscv: uprobes: Restore thread.bad_cause
    https://git.kernel.org/riscv/c/58b1294dd1d6

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html



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