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
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20260918130541.8962a797eeb80cab07b18f19@linux-foundation.org \
--to=akpm@linux-foundation.org \
--cc=bigeasy@linutronix.de \
--cc=linux-mm@kvack.org \
--cc=urezki@gmail.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.