From: Andrew Morton <akpm@linux-foundation.org>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: linux-mm@kvack.org, Uladzislau Rezki <urezki@gmail.com>
Subject: Re: [PATCH] mm/vmalloc: Use %p for pointer formatting
Date: Fri, 18 Sep 2026 13:05:41 -0700 [thread overview]
Message-ID: <20260918130541.8962a797eeb80cab07b18f19@linux-foundation.org> (raw)
In-Reply-To: <20260918105013.UpdykT6j@linutronix.de>
On Fri, 18 Sep 2026 12:50:13 +0200 Sebastian Andrzej Siewior <bigeasy@linutronix.de> wrote:
> Commit 45ec16908e84e ("mm: use %pK for /proc/vmallocinfo") introduced
> the %pK in order not to leak kernel pointers.
> Since commit ad67b74d2469d ("printk: hash addresses printed with
> %p") pointers are hashed by default and the behaviour can be controller
> by `hash_pointers' boot argument.
> The policy on %p is to not introduce new ones.
> Removing %pK makes it possible to remove its handling from the library.
>
> Looking at the output, having the pointer in the output makes it
> possible to distinguish the individual entries.
>
> Use %p instead %pK.
Fair enough.
I added this (important) info to the changelog. Please confirm its
accurary.
: /proc/vmallocinfo has mode 0400, so this change doesn't make kernel
: pointer information available to unprivileged userspace.
next prev parent reply other threads:[~2026-09-18 20:05 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-18 10:50 [PATCH] mm/vmalloc: Use %p for pointer formatting Sebastian Andrzej Siewior
2026-09-18 20:05 ` Andrew Morton [this message]
2026-09-18 20:14 ` Sebastian Andrzej Siewior
2026-09-19 0:39 ` SJ Park
2026-09-19 7:23 ` Uladzislau Rezki
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