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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=dEYUfVLB; 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 EDE06607F296; Wed, 4 Nov 2026 19:38:19 +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=dEYUfVLB Received: by smtp.kernel.org (Postfix) with ESMTPSA id 655801F00919; Wed, 4 Nov 2026 19:38:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793821099; bh=moTp49XZfW2IxIkO6/t4/a2jJtvDF10yNUa6q6hnE3E=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=dEYUfVLBA2EwlpohdyDXzTpTkRMJNpEZw07PenB3nQEME5dlyhNXhUUoG8mOjVcfv oPDIsebnx4tZSNv75ByRLEUZV0ZfOVLMGkLYWrqFTsxkA4voQYbiWI7Chp/G19hq8j DKzQFd+kG9Z/ZczXaQksi6FimDULy8ynh1v+zV87qzzRKlJkR46N6iuYi3HyauJb0/ ixnpXSjhwjAMxt3EXBGirkIdHW2TupS7i0FdK5IMsq4hJkLRXlD9MCqRth25zPpRvr XFXCckKRVb1cNliO2C/VaesIJ4kkrjLqwN3PZvlgzr9t7ORqmcl1O6UD3IPPtWLnEr 6EHLI6lqSf6WA== 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 10/23] sh: alignment: let procfs copy in writes Date: Wed, 4 Nov 2026 20:38:05 +0100 Message-ID: <20261104-work-procfs-arch-v2-10-2aeb952c9597@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=1293; i=brauner@kernel.org; h=from:subject:message-id; bh=pcWTmpkZi08Bh4Hys88761LsQ4siFbSCZrSZZozxPfE=; b=kA0DAAoWkcYbwGV43KIByyZiAGrriPihaE1Ps2uzOVufjFEo6SEyunTx1SnW2Cza+IFLmTCnS Ih1BAAWCgAdFiEEQIc0Vx6nDHizMmkokcYbwGV43KIFAmrriPgACgkQkcYbwGV43KIBxwEA3vYT I915GRHPWFgUXtRSl6XArUTI58ux3r8jCqihWjgA/RPKZfjZEripcr0Hh6B3Oon/z2/aODYAora Qp9As5NML 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 the alignment files before it pins the entry, and take the mode from that copy. Writes larger than PAGE_SIZE - 1 bytes fail with -EINVAL now. Signed-off-by: Christian Brauner (Amutable) --- arch/sh/mm/alignment.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/arch/sh/mm/alignment.c b/arch/sh/mm/alignment.c index 2198c6f2ea63..d832249a8e18 100644 --- a/arch/sh/mm/alignment.c +++ b/arch/sh/mm/alignment.c @@ -133,14 +133,13 @@ static int alignment_proc_show(struct seq_file *m, void *v) } static ssize_t alignment_proc_write(struct file *file, - const char __user *buffer, size_t count, loff_t *pos) + char *buffer, size_t count, loff_t *pos) { int *data = pde_data(file_inode(file)); char mode; if (count > 0) { - if (get_user(mode, buffer)) - return -EFAULT; + mode = buffer[0]; if (mode >= '0' && mode <= '5') *data = mode - '0'; } @@ -149,7 +148,7 @@ static ssize_t alignment_proc_write(struct file *file, static const struct proc_ops alignment_proc_ops = { .proc_show = alignment_proc_show, - .proc_write = alignment_proc_write, + .proc_write_buf = alignment_proc_write, }; /* -- 2.53.0