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bh=LszWaK2OxyFETKFjp08RyLJe51kGVnPia0WSLRR6bLM=; b=ahKUzwa1iFn05TY05h4Ho43EJRAb8oKWuIYWwZBKT++ZLdpNL6fsWaLAxZNeJLpB93D4Su nXUsLyFdfi1oSmLcOXwkt6rJiTaQlS6+SXqztst3CMAYRRMwBNVBvmH/SXy0bYbzLkTQj2 wAoTcwy/lJCWSqHM+m4PW6XJTZxx/ZgNwgOIzdsbehoInQfmsPdD/6hId95ug3OjesnCjt bhboNjjkaZ4FEZCGYlK4bjal/GtAHd1rczE9AxHsVRZm5QOQEpDY+Gzr4a3kNIGGk0cMzY zBv0gYCMD/eh8iho65AHC7C7Ys9UKpUG0DV9+FjS2RKxbDjp3z0P4Yydr2/dqg== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1789762445; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=LszWaK2OxyFETKFjp08RyLJe51kGVnPia0WSLRR6bLM=; b=by6J+pVghEP7dXASorr5vGNRIa+z1M+Y6Y7rKEybZxNmt6Fqz0wv+mHondZpHhLhvG33aE 7oj3AZIoNC+GIRAA== From: Sebastian Andrzej Siewior To: Andrew Morton Cc: linux-mm@kvack.org, Uladzislau Rezki Subject: Re: [PATCH] mm/vmalloc: Use %p for pointer formatting Message-ID: <20260918201404.yEHv4zSf@linutronix.de> References: <20260918105013.UpdykT6j@linutronix.de> <20260918130541.8962a797eeb80cab07b18f19@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20260918130541.8962a797eeb80cab07b18f19@linux-foundation.org> X-Rspam-User: X-Stat-Signature: k3w6nenanwekwo1sk6zzoy69an53tbfy X-Rspamd-Queue-Id: 44789180009 X-Rspamd-Server: rspam07 X-HE-Tag: 1789762448-548019 X-HE-Meta: U2FsdGVkX19UGj4ukGiNlXbQ6Bt/umyhUC6f/4rPRg0EJSf6c5lpgsekukeNqo3MuUpb4ngS7NypW4fsSx6Fc4+Gg1GdAy8pHr6/bhcWpxTDEJ8toC/3VxAwD2IUxU67dMmuwArp6qvwxNwchW1W61xjFRH+x5SBnII3e7qGuaIUQGXOEWhrRGX6pXlOWbeLY0K3PKdcKeLH7al6+ixvi+L5Ag2yrMLzDOWZlTCP3dIqKuQB/1CV/JC974IMP351CjfUWbHjayuyHiEBxjGJg9wx0I8hPyZntC9nv+Vj0R1wr9unu65CveCxCmbNtWW+i3fxbrxRUIhuj9Z3wxCZYDyxsaaA1RF03PiNGHlDjKWBrzbU2Bq89A4OMV4naB2s27sJfQDwPB+vyhL00crhlAjZ9lIDGdheIsmhZ73ajoz34YfRWtIny5H8ggMZgWqSM4ra6R7m55izDccLNoPL2OvPrGWskhbwl3AqtIX4HRLnE7knH+j9s6AdauQz85HCjeTyxkiwfaDR+5pi9VqQv2lfRrNvNgjV7VCpCojE+5921u6kVhkb2wAgu0S+8Gm0zsW9Hezk69hx+jgi4MyHbXOtW6pRat1D3luNzckK6mnm0/8xJUkbYtS3yuAY6aJpJiMZox3l45gauKbP6SVIZs7/+Mfo6MSe6+IS3+Zgh2Pg76cHZ+iJi8vvKFPB9yLvkGvr1gJSfS86kuG53c8kx5ZEG+xUlNh7xSO3XC1Pl+lu2rvSpigmTTVNkI2CS6k5yU3VVkvf5m4A581+pE+scjhXex1rwQ8Qq6dlTbEy/p/Rx4cX4pgO1i1sQqqu72FaveoJu3uHUWtpuVlbrXawNxyUifEvc6QBSrC9PhjlDjayVsFfLlm4M6CJxQVcMITsZ7l9E1ynN0LseVI57STzraze359wTydaJhuadR/yYAb1pTlCCT8s57g0X3iaV31nx/VvSaplSjkXOYhpJbg ZK1X013o XgHMfYg8zh2ICUrPjZsK5v0HeJa+tT5TD1x2EMff1X0n+mpyLK/ZYBiumukc/lS40nJOwV3rXw7FDopxIRQmwn6It23EV8mhlWGXM/dFQ0HBk+oV6nA8jQxBS7kn1kswQNC2/vCevnaW1b2lrL7T42Kr/JSMx/B1HfhyLBoOOWGms1/lipl6C9qPX+ZtrS0iL+0kY Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2026-09-18 13:05:41 [-0700], Andrew Morton wrote: > On Fri, 18 Sep 2026 12:50:13 +0200 Sebastian Andrzej Siewior 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. Confirmed. [%p is hashed by default so things shouldn't change here.] Sebastian