linux-kernel - Re: [PATCH] binder: don't use %pK through printk

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Message-ID: <aWC6xu5px9MbTqS7@google.com>
Date: Fri, 9 Jan 2026 08:22:30 +0000
From: Alice Ryhl <aliceryhl@...gle.com>
To: "Thomas Weißschuh" <thomas.weissschuh@...utronix.de>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
	"Arve Hjønnevåg" <arve@...roid.com>, Todd Kjos <tkjos@...roid.com>, 
	Christian Brauner <brauner@...nel.org>, Carlos Llamas <cmllamas@...gle.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] binder: don't use %pK through printk

On Wed, Jan 07, 2026 at 03:29:50PM +0100, 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 printk(). They can still unintentionally leak raw
> pointers or acquire sleeping locks 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@...utronix.de>

Reviewed-by: Alice Ryhl <aliceryhl@...gle.com>