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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="TFjDqZZ/"; 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 1EFAA6072650; Wed, 4 Nov 2026 19:41:17 +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=TFjDqZZ/ Received: by smtp.kernel.org (Postfix) with ESMTPSA id 79D881F00919; Wed, 4 Nov 2026 19:41:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793821277; bh=zr7obOUiLNzJ4M2rJicyi/Ze6HCzMDPfBdGpZnrgFfM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=TFjDqZZ/yUzLlq0AHrRb5nxWFxABXvXQCDCDepRKxtO/+DBoiHd924rOXqwV39mBk 7xCkrI7XXqopmEBEygr+d7LVUhWDkEjbtByAS2BeniVcX7cUeVHz8fQauHPvv0iTAN N7eRvtbhE1tCTi/bRw9rc3UYJbpqIAjFGWaWNdO/ByRLbrk2T4vEZCSk1IeyoJGCNP l+FooINdTw1eqVGKCx+YGE50hLogaFCmEhwRPgTTm9Jo8wQRCWb1gsfGDrq+Yb3o2r eWpzM29PtQ6IavQhyK8jALEj1OfP2htX9ROHmW9j/4lxcAS1kM28pIz9UvG9ZDYqie 36VczlHeApOTg== 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 22/23] PNP: pnpbios: let procfs copy in writes Date: Wed, 4 Nov 2026 20:41:03 +0100 Message-ID: <20261104-work-procfs-arch-v2-22-2aeb952c9597@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: linux-debuggers@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=1575; i=brauner@kernel.org; h=from:subject:message-id; bh=IXYMr4OIXAB8ydnfVDKQ7NIihIFaHGo221DwmHIwdwA=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS97mR/NSPT6HkaC/vt8vZrrZOf7cn8cOajzZze4try1 XtLbIuDO0pZGMS4GGTFFFkc2k3C5ZbzVGw2ytSAmcPKBDKEgYtTACYy7RvDf9eUspCkiD7zz/mp M1Q770my3G5f1nJheSLzi75vySe2PWX4K9E+OSP6wK3TV2dX82rV71go8lKvXe+0OfMZ0ZTd8x/ MYgAA 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 to /proc/bus/pnp/ before it pins the entry, and take the node data from that copy. A node with more than PAGE_SIZE - 1 bytes of data can't be written anymore. I don't think there are any. Signed-off-by: Christian Brauner (Amutable) --- drivers/pnp/pnpbios/proc.c | 9 +++------ 1 file changed, 3 insertions(+), 6 deletions(-) diff --git a/drivers/pnp/pnpbios/proc.c b/drivers/pnp/pnpbios/proc.c index 14632a8d0da0..00163aedd738 100644 --- a/drivers/pnp/pnpbios/proc.c +++ b/drivers/pnp/pnpbios/proc.c @@ -171,7 +171,7 @@ static int pnpbios_proc_show(struct seq_file *m, void *v) return 0; } -static ssize_t pnpbios_proc_write(struct file *file, const char __user *buf, +static ssize_t pnpbios_proc_write(struct file *file, char *buf, size_t count, loff_t *pos) { void *data = pde_data(file_inode(file)); @@ -191,10 +191,7 @@ static ssize_t pnpbios_proc_write(struct file *file, const char __user *buf, ret = -EINVAL; goto out; } - if (copy_from_user(node->data, buf, count)) { - ret = -EFAULT; - goto out; - } + memcpy(node->data, buf, count); if (pnp_bios_set_dev_node(node->handle, boot, node) != 0) { ret = -EINVAL; goto out; @@ -207,7 +204,7 @@ out: static const struct proc_ops pnpbios_proc_ops = { .proc_show = pnpbios_proc_show, - .proc_write = pnpbios_proc_write, + .proc_write_buf = pnpbios_proc_write, }; int pnpbios_interface_attach_device(struct pnp_bios_node *node) -- 2.53.0