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Mon, 2 Nov 2026 15:07:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793632053; bh=Jqve5dom8G0YagWg0DUi21Qt2CUJnz11dMCfHhOCDkM=; h=From:Date:Subject:References:In-Reply-To:To:Cc; b=htIvLzE5mRDE3y0tqv1kyv8W5k1g/Ii7ANwuWhratSAOFS7tbxL3BToIPDpZE85DE FNEsXXzLmfR4qQugMxmA9eyhIHm6Q6dJAmTZKLeIUK1bHgaHB6rg72WkRZftlCgoe6 E2QfeUCqIA0Nboam57Dh1SlJUtOEamqW0FpuXdYHq09VCiD2DRiKvdUgmVI6MwZESI HWhsjmhK16tI0mtjDz6fsLrdm37sQrZUo7icVQ6YX0Qr2rzi5YjsmWINl56IQd0nMx zqjv85Bp1EemyFNq5w6kuaSNgOUZ321NOGqFqL1mOki6ZfyR8nruUh1khBiylH7rMN bCkpWmWU3eNXw== From: Christian Brauner Date: Mon, 02 Nov 2026 16:01:44 +0100 Subject: [PATCH RFC 17/22] ACPI: proc: let procfs copy in writes to /proc/acpi/wakeup X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , Precedence: list X-Archived-By: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261102-work-procfs-arch-v1-17-c9492ab08480@kernel.org> References: <20261102-work-procfs-arch-v1-0-c9492ab08480@kernel.org> In-Reply-To: <20261102-work-procfs-arch-v1-0-c9492ab08480@kernel.org> 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 X-Mailer: b4 0.17-dev X-Spam-Status: No, score=-18.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_PASS, SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 Implement ->proc_write_buf() so procfs copies in what is written before it pins the entry, and take the device name from that copy. Writes larger than PAGE_SIZE - 1 bytes fail with -EINVAL now. Signed-off-by: Christian Brauner (Amutable) --- drivers/acpi/proc.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/drivers/acpi/proc.c b/drivers/acpi/proc.c index b8a0bd4580e0..feb8283fd855 100644 --- a/drivers/acpi/proc.c +++ b/drivers/acpi/proc.c @@ -86,7 +86,7 @@ static void physical_device_enable_wakeup(struct acpi_device *adev) static ssize_t acpi_system_write_wakeup_device(struct file *file, - const char __user * buffer, + char *buffer, size_t count, loff_t * ppos) { struct acpi_device *dev, *tmp; @@ -96,8 +96,7 @@ acpi_system_write_wakeup_device(struct file *file, if (count > 4) count = 4; - if (copy_from_user(strbuf, buffer, count)) - return -EFAULT; + memcpy(strbuf, buffer, count); strbuf[count] = '\0'; sscanf(strbuf, "%s", str); @@ -123,7 +122,7 @@ acpi_system_write_wakeup_device(struct file *file, static const struct proc_ops acpi_system_wakeup_device_proc_ops = { .proc_show = acpi_system_wakeup_device_seq_show, - .proc_write = acpi_system_write_wakeup_device, + .proc_write_buf = acpi_system_write_wakeup_device, }; void __init acpi_sleep_proc_init(void) -- 2.53.0