The specification of prctl() for GET_UNALIGN_CTL states that the value is
returned in an unsigned int * address passed as an unsigned long. Change
the type to match that and avoid an unaligned access as well.

Signed-off-by: Clément Léger <cleger@rivosinc.com>
---
 arch/riscv/kernel/process.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c
index 15d8f75902f8..9ee6d816b98b 100644
--- a/arch/riscv/kernel/process.c
+++ b/arch/riscv/kernel/process.c
@@ -57,7 +57,7 @@ int get_unalign_ctl(struct task_struct *tsk, unsigned long adr)
 	if (!unaligned_ctl_available())
 		return -EINVAL;
 
-	return put_user(tsk->thread.align_ctl, (unsigned long __user *)adr);
+	return put_user(tsk->thread.align_ctl, (unsigned int __user *)adr);
 }
 
 void __show_regs(struct pt_regs *regs)
-- 
2.49.0

Hi Clément,

On 5/30/25 22:56, Clément Léger wrote:
> The specification of prctl() for GET_UNALIGN_CTL states that the value is
> returned in an unsigned int * address passed as an unsigned long. Change
> the type to match that and avoid an unaligned access as well.
>
> Signed-off-by: Clément Léger <cleger@rivosinc.com>
> ---
>   arch/riscv/kernel/process.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/arch/riscv/kernel/process.c b/arch/riscv/kernel/process.c
> index 15d8f75902f8..9ee6d816b98b 100644
> --- a/arch/riscv/kernel/process.c
> +++ b/arch/riscv/kernel/process.c
> @@ -57,7 +57,7 @@ int get_unalign_ctl(struct task_struct *tsk, unsigned long adr)
>   	if (!unaligned_ctl_available())
>   		return -EINVAL;
>   
> -	return put_user(tsk->thread.align_ctl, (unsigned long __user *)adr);
> +	return put_user(tsk->thread.align_ctl, (unsigned int __user *)adr);
>   }
>   
>   void __show_regs(struct pt_regs *regs)


Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com>

Thanks,

Alex