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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=Wy0boZ5z; 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 448136071A0E; Wed, 4 Nov 2026 19:40:48 +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=Wy0boZ5z Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9FC2E1F0093A; Wed, 4 Nov 2026 19:40:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793821247; bh=ljglEsXifce2qfRBf9KQz9o848Hwgwzekl8g5JPLaig=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Wy0boZ5zanG430YNSID9PvLo8Hz+/29VvJoJ9WySCgaVz1GS+M9Ng0mKTlmCR6Sp3 Wy6SgMb3/VqyekYQ/1cR/jjtPSaurM/Udr3bvNEYMuoz7g7KxSi3hffidsqtPL6rT+ kNwUs9q+tNP6NBKx59NYF9AsYxVfTGuDi6XKbhHh4hcUsnEviZrGiHrP56E4+mGRvY JVVBJqh6UNVAz2b97ZBb5pcE8f/kvEg6BQoxsArkq6nlESYRlG+raNwuWLjBL5Fegx ogU0jkHe5zezEzx7v8f9ltgbWRNKY/tsEAVwKI2tVEh2fNgrnaN9ng+jA/EICHiT9S CNdt1XlVegAtA== 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 20/23] platform/x86: thinkpad_acpi: let procfs copy in writes Date: Wed, 4 Nov 2026 20:40:33 +0100 Message-ID: <20261104-work-procfs-arch-v2-20-2aeb952c9597@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-fbdev@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=1670; i=brauner@kernel.org; h=from:subject:message-id; bh=B1JM/SyKlO95qrS7p0kfKzr/VxkM25eIJbDMnht8OJo=; b=owGbwMvMwCU28Zj0gdSKO4sYT6slMWS97mSx1F3VulFfxXnpV5EtBz+raF7cItzSzr37e8o/J X1NniM3O0pZGMS4GGTFFFkc2k3C5ZbzVGw2ytSAmcPKBDKEgYtTACZydikjw5J2aZXovIq/n3/0 ZQtu+2Fn9/PUc5+zb7fMOXwlwMPtzzxGhsertpXcs3gT5Xh92pP36mKWQvHOiqu49M5OudX+dnL TCTYA 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/acpi/ibm/* before it pins the entry, and hand that copy to ->write(). procfs already rejects writes larger than PAGE_SIZE - 1 bytes. Signed-off-by: Christian Brauner (Amutable) --- drivers/platform/x86/lenovo/thinkpad_acpi.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) diff --git a/drivers/platform/x86/lenovo/thinkpad_acpi.c b/drivers/platform/x86/lenovo/thinkpad_acpi.c index 2ee208c82801..8287b36bd90d 100644 --- a/drivers/platform/x86/lenovo/thinkpad_acpi.c +++ b/drivers/platform/x86/lenovo/thinkpad_acpi.c @@ -882,7 +882,7 @@ static int dispatch_proc_show(struct seq_file *m, void *v) } static ssize_t dispatch_proc_write(struct file *file, - const char __user *userbuf, + char *buf, size_t count, loff_t *pos) { struct ibm_struct *ibm = pde_data(file_inode(file)); @@ -890,14 +890,8 @@ static ssize_t dispatch_proc_write(struct file *file, if (!ibm || !ibm->write) return -EINVAL; - if (count > PAGE_SIZE - 1) - return -EINVAL; - - char *kernbuf __free(kfree) = memdup_user_nul(userbuf, count); - if (IS_ERR(kernbuf)) - return PTR_ERR(kernbuf); - ret = ibm->write(kernbuf); + ret = ibm->write(buf); if (ret) return ret; @@ -906,7 +900,7 @@ static ssize_t dispatch_proc_write(struct file *file, static const struct proc_ops dispatch_proc_ops = { .proc_show = dispatch_proc_show, - .proc_write = dispatch_proc_write, + .proc_write_buf = dispatch_proc_write, }; /**************************************************************************** -- 2.53.0