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smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Kq+FKfxG; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7AD806080787; Wed, 4 Nov 2026 19:40:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Kq+FKfxG Received: by smtp.kernel.org (Postfix) with ESMTPSA id D0DEB1F0093A; Wed, 4 Nov 2026 19:40:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793821233; bh=lzi0v2Iw6r5Nf2GLOsMSQBwdPNX93e2TzGzGfD3oQvk=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Kq+FKfxGol1yZkTvQK7XOf4MJYg3n2wT++qWRo+QnGi9jvJMQIfuuwXxBQd6HrxO9 DzaQAB8BU2qMveOWYqXQf8uiF3jI1+TMalzy94+Rcd9plW4bEe5kD06s2YR2pJWce9 B6hFJWwiorAIE62RUnEWt3yo5nQlNa9h0jz+aofQy/98+6YVivsZ0C7K1SwAby0aHP 7T5oXbKe+XnQQnQPrW8rV5dPeOZRh0+N4R8p2Y7AHvXwgCCSGo3lTHp1Qs3mmTBfkR oBUp+SJ51x7+DV6W8OrsLZe3q3dTzc8ph41dFrQv8E2WNRYsf3TxqVqdtFkK0eHuLm os2hfJBqXQfoA== From: Christian Brauner To: linux-fsdevel@vger.kernel.org Cc: Linus Torvalds , Jann Horn , Josef Bacik , Chris Mason , Jeff Layton , NeilBrown , Eric Dumazet , Thomas Gleixner , Al Viro , Jonathan Corbet , Christoph Hellwig , Greg Kroah-Hartman , Joel Granados , Kees Cook , Jan Kara , Jan Kara , linux-kernel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-acpi@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-s390@vger.kernel.org, linux-scsi@vger.kernel.org, linux-um@lists.infradead.org, linux-wireless@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, netdev@vger.kernel.org, ntfs3@lists.linux.dev, platform-driver-x86@vger.kernel.org, coreteam@netfilter.org, kexec@lists.infradead.org, linux-pci@vger.kernel.org, linux-sound@vger.kernel.org, netfilter-devel@vger.kernel.org, dri-devel@lists.freedesktop.org, ibm-acpi-devel@lists.sourceforge.net, jfs-discussion@lists.sourceforge.net, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-cifs@vger.kernel.org, linux-fbdev@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-mm@kvack.org, linux-sh@vger.kernel.org, linux-usb@vger.kernel.org, samba-technical@lists.samba.org, sparclinux@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-doc@vger.kernel.org, linux-serial@vger.kernel.org, linux-atm-general@lists.sourceforge.net, Takashi Iwai , linux-input@vger.kernel.org, linux-raid@vger.kernel.org, linux-ext4@vger.kernel.org, linux-modules@vger.kernel.org, linux-debuggers@vger.kernel.org, "Christian Brauner (Amutable)" , Chuck Lever Subject: [PATCH RESEND v2 19/23] macintosh/via-pmu: let procfs copy in writes to the options file Date: Wed, 4 Nov 2026 20:40:18 +0100 Message-ID: <20261104-work-procfs-arch-v2-19-2aeb952c9597@kernel.org> In-Reply-To: <20261104-work-procfs-arch-v2-0-2aeb952c9597@kernel.org> References: <20261104-work-procfs-arch-v2-0-2aeb952c9597@kernel.org> X-Mailing-List: netdev@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" X-Mailer: b4 0.17-dev X-Developer-Signature: v=1; a=openpgp-sha256; l=1397; i=brauner@kernel.org; h=from:subject:message-id; bh=agoZq1LJSKBxY7yRmppNE5tnXNWd/ezen+xLPyCzOnY=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS97mReIrzh9cx53/g23f7T5yBxj/3Wz2cX8wsWTF3AP 1t597qLVR2lLAxiXAyyYoosDu0m4XLLeSo2G2VqwMxhZQIZwsDFKQAT2cTOyNC6JvPZMlEVDrlF 196Vxjt56Gn83yn6YN/2thy+Tlspl+0M/+xtty1ZFrFn7v65W/6uCr1fY7JaSuT8qnn7/y2e7Ma Rt5IfAA== X-Developer-Key: i=brauner@kernel.org; a=openpgp; fpr=4880B8C9BD0E5106FC070F4F7B3C391EFEA93624 Content-Transfer-Encoding: 8bit Implement ->proc_write_buf() so procfs copies in what is written before it pins the entry, and parse the option from that copy. Writes larger than PAGE_SIZE - 1 bytes fail with -EINVAL now. Signed-off-by: Christian Brauner (Amutable) --- drivers/macintosh/via-pmu.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/macintosh/via-pmu.c b/drivers/macintosh/via-pmu.c index 49f929ae10e4..079c085be5d2 100644 --- a/drivers/macintosh/via-pmu.c +++ b/drivers/macintosh/via-pmu.c @@ -913,7 +913,7 @@ static int pmu_options_proc_show(struct seq_file *m, void *v) } static ssize_t pmu_options_proc_write(struct file *file, - const char __user *buffer, size_t count, loff_t *pos) + char *buffer, size_t count, loff_t *pos) { char tmp[33]; char *label, *val; @@ -923,8 +923,7 @@ static ssize_t pmu_options_proc_write(struct file *file, return -EINVAL; if (count > 32) count = 32; - if (copy_from_user(tmp, buffer, count)) - return -EFAULT; + memcpy(tmp, buffer, count); tmp[count] = 0; label = tmp; @@ -958,7 +957,7 @@ static ssize_t pmu_options_proc_write(struct file *file, static const struct proc_ops pmu_options_proc_ops = { .proc_show = pmu_options_proc_show, - .proc_write = pmu_options_proc_write, + .proc_write_buf = pmu_options_proc_write, }; #endif -- 2.53.0