From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5B211223316; Mon, 2 Jun 2025 14:10:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748873440; cv=none; b=e2myJyQa1g5a7+L9j+Gl8ombrKfk4JZyGEj7txXm8naHdVVjlwoopcAa8Kkn1qrq4b2Z9Wh1wo8LeLpBZtE9bG8Dj50a8Ms3chdSPueBuJJYVqwBYVBPzWjRlCR8rhYw7Z3L1S5bbeByDmKk53DBRMb/uT0DChvEnjbfp6kuUhs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748873440; c=relaxed/simple; bh=Hu+s/zgQLApmuDmJ20XvE4Hi/Xc1unjvKp9DyTuvnE4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=KGRMTDpPIMtdfeBDM6rLOwsAH0qYjA1sC8nBX1kMVQyJaV793jJw+YtA/u4dAwShaW8tf2D3fumGGE8Z+O+I6QzZseoPIDFtqBFWuNJS0ZM1tFqLbZXc5MolICDsElS0Tk+Ue7hHHpY7kyfdR8WGpnCo+SafBTmPMiYcrSTbrcU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=s3vBUuD9; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="s3vBUuD9" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 68CC3C4CEEB; Mon, 2 Jun 2025 14:10:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1748873439; bh=Hu+s/zgQLApmuDmJ20XvE4Hi/Xc1unjvKp9DyTuvnE4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=s3vBUuD9EtgXEzUkhLbIBA3T38P/quSRB9BYss+9VSN0JhmA/Az3adsNwp5ji6h55 y6SLTV19jJr4WZMYeees25u3MZXxBYcoOPG4C2LMZSby+AF/t5gNrGpVaaBebtyW0q XOXtshzb134vdg3XA/8mTjVyc37w15g1bv7I/O4Q= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, =?UTF-8?q?Thomas=20Wei=C3=9Fschuh?= , Thomas Gleixner , Sasha Levin Subject: [PATCH 6.6 112/444] timer_list: Dont use %pK through printk() Date: Mon, 2 Jun 2025 15:42:56 +0200 Message-ID: <20250602134345.440685003@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250602134340.906731340@linuxfoundation.org> References: <20250602134340.906731340@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Thomas Weißschuh [ Upstream commit a52067c24ccf6ee4c85acffa0f155e9714f9adce ] This reverts commit f590308536db ("timer debug: Hide kernel addresses via %pK in /proc/timer_list") The timer list helper SEQ_printf() uses either the real seq_printf() for procfs output or vprintk() to print to the kernel log, when invoked from SysRq-q. It uses %pK for printing pointers. In the past %pK was prefered over %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 looks in atomic contexts. Switch to the regular pointer formatting which is safer, easier to reason about and sufficient here. Signed-off-by: Thomas Weißschuh Signed-off-by: Thomas Gleixner Link: https://lore.kernel.org/lkml/20250113171731-dc10e3c1-da64-4af0-b767-7c7070468023@linutronix.de/ Link: https://lore.kernel.org/all/20250311-restricted-pointers-timer-v1-1-6626b91e54ab@linutronix.de Signed-off-by: Sasha Levin --- kernel/time/timer_list.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/time/timer_list.c b/kernel/time/timer_list.c index ed7d6ad694fba..20a5e6962b696 100644 --- a/kernel/time/timer_list.c +++ b/kernel/time/timer_list.c @@ -46,7 +46,7 @@ static void print_timer(struct seq_file *m, struct hrtimer *taddr, struct hrtimer *timer, int idx, u64 now) { - SEQ_printf(m, " #%d: <%pK>, %ps", idx, taddr, timer->function); + SEQ_printf(m, " #%d: <%p>, %ps", idx, taddr, timer->function); SEQ_printf(m, ", S:%02x", timer->state); SEQ_printf(m, "\n"); SEQ_printf(m, " # expires at %Lu-%Lu nsecs [in %Ld to %Ld nsecs]\n", @@ -98,7 +98,7 @@ print_active_timers(struct seq_file *m, struct hrtimer_clock_base *base, static void print_base(struct seq_file *m, struct hrtimer_clock_base *base, u64 now) { - SEQ_printf(m, " .base: %pK\n", base); + SEQ_printf(m, " .base: %p\n", base); SEQ_printf(m, " .index: %d\n", base->index); SEQ_printf(m, " .resolution: %u nsecs\n", hrtimer_resolution); -- 2.39.5