RE: [Intel-wired-lan] [PATCH net-next 7/7] net/mlx5: Don't use %pK through tracepoints

[Loktionov, Aleksandr]

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@xxxxxxxxxx> On Behalf Of
> Thomas Weißschuh
> Sent: Monday, April 14, 2025 10:26 AM
> To: Jeff Johnson <jjohnson@xxxxxxxxxx>; Loic Poulain
> <loic.poulain@xxxxxxxxxx>; Brian Norris <briannorris@xxxxxxxxxxxx>;
> Francesco Dolcini <francesco@xxxxxxxxxx>; Nguyen, Anthony L
> <anthony.l.nguyen@xxxxxxxxx>; Kitszel, Przemyslaw
> <przemyslaw.kitszel@xxxxxxxxx>; Andrew Lunn <andrew+netdev@xxxxxxx>;
> David S. Miller <davem@xxxxxxxxxxxxx>; Dumazet, Eric
> <edumazet@xxxxxxxxxx>; Jakub Kicinski <kuba@xxxxxxxxxx>; Paolo Abeni
> <pabeni@xxxxxxxxxx>; Saeed Mahameed <saeedm@xxxxxxxxxx>; Leon
> Romanovsky <leon@xxxxxxxxxx>; Tariq Toukan <tariqt@xxxxxxxxxx>
> Cc: ath10k@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> ath11k@xxxxxxxxxxxxxxxxxxx; ath12k@xxxxxxxxxxxxxxxxxxx;
> wcn36xx@xxxxxxxxxxxxxxxxxxx; linux-wireless@xxxxxxxxxxxxxxx; intel-wired-
> lan@xxxxxxxxxxxxxxxx; netdev@xxxxxxxxxxxxxxx; linux-rdma@xxxxxxxxxxxxxxx;
> Thomas Weißschuh <thomas.weissschuh@xxxxxxxxxxxxx>
> Subject: [Intel-wired-lan] [PATCH net-next 7/7] net/mlx5: Don't use %pK
> through tracepoints
> 
> In the past %pK was preferable to %p as it would not leak raw pointer values
> into the kernel log.
> Since commit ad67b74d2469 ("printk: hash addresses printed with %p") the
> regular %p has been improved to avoid this issue.
> Furthermore, restricted pointers ("%pK") were never meant to be used
> through tracepoints. They can still unintentionally leak raw pointers or acquire
> sleeping looks in atomic contexts.
> 
> Switch to the regular pointer formatting which is safer and easier to reason
> about.
> There are still a few users of %pK left, but these use it through seq_file, for
> which its usage is safe.
> 
> Signed-off-by: Thomas Weißschuh <thomas.weissschuh@xxxxxxxxxxxxx>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@xxxxxxxxx>
> ---
>  drivers/net/ethernet/mellanox/mlx5/core/sf/dev/diag/dev_tracepoint.h | 2
> +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git
> a/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/diag/dev_tracepoint.h
> b/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/diag/dev_tracepoint.h
> index
> 0537de86f9817dc80bd897688c539135b1ad37ac..9b0f44253f332aa602a8
> 4a1f6d7532a500dd4f55 100644
> --- a/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/diag/dev_tracepoint.h
> +++ b/drivers/net/ethernet/mellanox/mlx5/core/sf/dev/diag/dev_tracepoint
> +++ .h
> @@ -28,7 +28,7 @@ DECLARE_EVENT_CLASS(mlx5_sf_dev_template,
>  				   __entry->hw_fn_id = sfdev->fn_id;
>  				   __entry->sfnum = sfdev->sfnum;
>  		    ),
> -		    TP_printk("(%s) sfdev=%pK aux_id=%d hw_id=0x%x
> sfnum=%u\n",
> +		    TP_printk("(%s) sfdev=%p aux_id=%d hw_id=0x%x
> sfnum=%u\n",
>  			      __get_str(devname), __entry->sfdev,
>  			      __entry->aux_id, __entry->hw_fn_id,
>  			      __entry->sfnum)
> 
> --
> 2.49.0