| Message ID | 20250414-restricted-pointers-net-v1-7-12af0ce46cdd@linutronix.de (mailing list archive) |
|---|---|
| State | New |
| Delegated to: | Johannes Berg |
| Headers | show |
| Series | net: Don't use %pK through printk | expand |
On 14/04/2025 11:26, Thomas Weißschuh wrote: > 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@linutronix.de> > --- > drivers/net/ethernet/mellanox/mlx5/core/sf/dev/diag/dev_tracepoint.h | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
> -----Original Message----- > From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of > Thomas Weißschuh > Sent: Monday, April 14, 2025 10:26 AM > To: Jeff Johnson <jjohnson@kernel.org>; Loic Poulain > <loic.poulain@linaro.org>; Brian Norris <briannorris@chromium.org>; > Francesco Dolcini <francesco@dolcini.it>; Nguyen, Anthony L > <anthony.l.nguyen@intel.com>; Kitszel, Przemyslaw > <przemyslaw.kitszel@intel.com>; Andrew Lunn <andrew+netdev@lunn.ch>; > David S. Miller <davem@davemloft.net>; Dumazet, Eric > <edumazet@google.com>; Jakub Kicinski <kuba@kernel.org>; Paolo Abeni > <pabeni@redhat.com>; Saeed Mahameed <saeedm@nvidia.com>; Leon > Romanovsky <leon@kernel.org>; Tariq Toukan <tariqt@nvidia.com> > Cc: ath10k@lists.infradead.org; linux-kernel@vger.kernel.org; > ath11k@lists.infradead.org; ath12k@lists.infradead.org; > wcn36xx@lists.infradead.org; linux-wireless@vger.kernel.org; intel-wired- > lan@lists.osuosl.org; netdev@vger.kernel.org; linux-rdma@vger.kernel.org; > Thomas Weißschuh <thomas.weissschuh@linutronix.de> > 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@linutronix.de> Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com> > --- > 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
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..9b0f44253f332aa602a84a1f6d7532a500dd4f55 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)
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@linutronix.de> --- drivers/net/ethernet/mellanox/mlx5/core/sf/dev/diag/dev_tracepoint.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)