From patchwork Mon Dec 2 19:02:57 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Patchwork-Id: 846662 Received: from todd.t-8ch.de (todd.t-8ch.de [159.69.126.157]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3C08F1DE3C4; Mon, 2 Dec 2024 19:03:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.69.126.157 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733166182; cv=none; b=r9NdPQtXJyUAA02gVaUzpnvuCZ6U+dOFVVoKDeF2G0uwy+VqJB7GBPOh6kh6cb1uKT8jtSSqBybTaGNs5vqrLDz428f/1tW1GQOMi31QRH1db+ITMJBVwOz2GolfwsZsqO+uHoVCMCl2+f9YH8LWcSzzQR2LcRv8b8Y5LmX8ktY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733166182; c=relaxed/simple; bh=uHM1UhfYdRZ6N8xcPihWTT3Dt+4pxM6VrmWQK6SvFgE=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=Z0CnzrR+8zeyGEMWKjBlOwKbzXLxhht8xJfSscl5jm7dSQxEIP0o9n824rvJilx8vICWcKmZE5dReZKob9NqwviKRzpVCfFyBoqF+pdKdRZiAPmfqimdJN+hYEW25OyXYrdi+fsNPnzc21mB6YC1Yj6Nhji+Q7MFIpiy+p6kJ2o= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=weissschuh.net; spf=pass smtp.mailfrom=weissschuh.net; dkim=pass (1024-bit key) header.d=weissschuh.net header.i=@weissschuh.net header.b=ru/X1cQp; arc=none smtp.client-ip=159.69.126.157 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=weissschuh.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=weissschuh.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=weissschuh.net header.i=@weissschuh.net header.b="ru/X1cQp" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=weissschuh.net; s=mail; t=1733166178; bh=uHM1UhfYdRZ6N8xcPihWTT3Dt+4pxM6VrmWQK6SvFgE=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=ru/X1cQptkxJ/uVTFjmipOHc/DXjdiiDfBpRJ5ON9pPrmT6/8tim3oe8B+CqtZsWa evlXrdSe13pjKywX6bGEU8KrzkxcldzZvnefUr0RMr3Eq4T1t6SLCkohK12RqOLGCt fBtKkr2hJDQEXX5QSqkGSPkZPVti/GA77b22h0Rw= From: =?utf-8?q?Thomas_Wei=C3=9Fschuh?= Date: Mon, 02 Dec 2024 20:02:57 +0100 Subject: [PATCH 1/4] PCI/sysfs: Constify 'struct bin_attribute' Precedence: bulk X-Mailing-List: linux-acpi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241202-sysfs-const-bin_attr-pci-v1-1-c32360f495a7@weissschuh.net> References: <20241202-sysfs-const-bin_attr-pci-v1-0-c32360f495a7@weissschuh.net> In-Reply-To: <20241202-sysfs-const-bin_attr-pci-v1-0-c32360f495a7@weissschuh.net> To: Bjorn Helgaas , Logan Gunthorpe , "Rafael J. Wysocki" , Len Brown Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, linux-acpi@vger.kernel.org, =?utf-8?q?Thomas_Wei=C3=9Fschuh?= X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1733166177; l=6597; i=linux@weissschuh.net; s=20221212; h=from:subject:message-id; bh=uHM1UhfYdRZ6N8xcPihWTT3Dt+4pxM6VrmWQK6SvFgE=; b=eHNiv2Nx/FBJHseNW5xk4DD74P9+Wq87tyeILQR7db+9m4lSIrM/JU+VYkbItpomaflhOe78z 80fgFRKhZuoCwgxlIoUxrLRQFAT/Rvi6UPClaeSuOK83us05ej+pi21 X-Developer-Key: i=linux@weissschuh.net; a=ed25519; pk=KcycQgFPX2wGR5azS7RhpBqedglOZVgRPfdFSPB1LNw= The sysfs core now allows instances of 'struct bin_attribute' to be moved into read-only memory. Make use of that to protect them against accidental or malicious modifications. Signed-off-by: Thomas Weißschuh --- drivers/pci/pci-sysfs.c | 42 +++++++++++++++++++++--------------------- 1 file changed, 21 insertions(+), 21 deletions(-) diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 7679d75d71e534d4f3d1e1b4ae6c5ee5f8518ea1..6f1bb7514efb3281281fc7d9b9f1f8f9d501b969 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -694,7 +694,7 @@ static ssize_t boot_vga_show(struct device *dev, struct device_attribute *attr, static DEVICE_ATTR_RO(boot_vga); static ssize_t pci_read_config(struct file *filp, struct kobject *kobj, - struct bin_attribute *bin_attr, char *buf, + const struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj)); @@ -769,7 +769,7 @@ static ssize_t pci_read_config(struct file *filp, struct kobject *kobj, } static ssize_t pci_write_config(struct file *filp, struct kobject *kobj, - struct bin_attribute *bin_attr, char *buf, + const struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj)); @@ -837,9 +837,9 @@ static ssize_t pci_write_config(struct file *filp, struct kobject *kobj, return count; } -static BIN_ATTR(config, 0644, pci_read_config, pci_write_config, 0); +static const BIN_ATTR(config, 0644, pci_read_config, pci_write_config, 0); -static struct bin_attribute *pci_dev_config_attrs[] = { +static const struct bin_attribute *const pci_dev_config_attrs[] = { &bin_attr_config, NULL, }; @@ -856,7 +856,7 @@ static size_t pci_dev_config_attr_bin_size(struct kobject *kobj, } static const struct attribute_group pci_dev_config_attr_group = { - .bin_attrs = pci_dev_config_attrs, + .bin_attrs_new = pci_dev_config_attrs, .bin_size = pci_dev_config_attr_bin_size, }; @@ -887,8 +887,8 @@ pci_llseek_resource(struct file *filep, * callback routine (pci_legacy_read). */ static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj, - struct bin_attribute *bin_attr, char *buf, - loff_t off, size_t count) + const struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) { struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj)); @@ -912,8 +912,8 @@ static ssize_t pci_read_legacy_io(struct file *filp, struct kobject *kobj, * callback routine (pci_legacy_write). */ static ssize_t pci_write_legacy_io(struct file *filp, struct kobject *kobj, - struct bin_attribute *bin_attr, char *buf, - loff_t off, size_t count) + const struct bin_attribute *bin_attr, + char *buf, loff_t off, size_t count) { struct pci_bus *bus = to_pci_bus(kobj_to_dev(kobj)); @@ -1003,8 +1003,8 @@ void pci_create_legacy_files(struct pci_bus *b) b->legacy_io->attr.name = "legacy_io"; b->legacy_io->size = 0xffff; b->legacy_io->attr.mode = 0600; - b->legacy_io->read = pci_read_legacy_io; - b->legacy_io->write = pci_write_legacy_io; + b->legacy_io->read_new = pci_read_legacy_io; + b->legacy_io->write_new = pci_write_legacy_io; /* See pci_create_attr() for motivation */ b->legacy_io->llseek = pci_llseek_resource; b->legacy_io->mmap = pci_mmap_legacy_io; @@ -1099,7 +1099,7 @@ static int pci_mmap_resource_wc(struct file *filp, struct kobject *kobj, } static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj, - struct bin_attribute *attr, char *buf, + const struct bin_attribute *attr, char *buf, loff_t off, size_t count, bool write) { #ifdef CONFIG_HAS_IOPORT @@ -1142,14 +1142,14 @@ static ssize_t pci_resource_io(struct file *filp, struct kobject *kobj, } static ssize_t pci_read_resource_io(struct file *filp, struct kobject *kobj, - struct bin_attribute *attr, char *buf, + const struct bin_attribute *attr, char *buf, loff_t off, size_t count) { return pci_resource_io(filp, kobj, attr, buf, off, count, false); } static ssize_t pci_write_resource_io(struct file *filp, struct kobject *kobj, - struct bin_attribute *attr, char *buf, + const struct bin_attribute *attr, char *buf, loff_t off, size_t count) { int ret; @@ -1210,8 +1210,8 @@ static int pci_create_attr(struct pci_dev *pdev, int num, int write_combine) } else { sprintf(res_attr_name, "resource%d", num); if (pci_resource_flags(pdev, num) & IORESOURCE_IO) { - res_attr->read = pci_read_resource_io; - res_attr->write = pci_write_resource_io; + res_attr->read_new = pci_read_resource_io; + res_attr->write_new = pci_write_resource_io; if (arch_can_pci_mmap_io()) res_attr->mmap = pci_mmap_resource_uc; } else { @@ -1292,7 +1292,7 @@ void __weak pci_remove_resource_files(struct pci_dev *dev) { return; } * writing anything except 0 enables it */ static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj, - struct bin_attribute *bin_attr, char *buf, + const struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj)); @@ -1318,7 +1318,7 @@ static ssize_t pci_write_rom(struct file *filp, struct kobject *kobj, * device corresponding to @kobj. */ static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj, - struct bin_attribute *bin_attr, char *buf, + const struct bin_attribute *bin_attr, char *buf, loff_t off, size_t count) { struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj)); @@ -1344,9 +1344,9 @@ static ssize_t pci_read_rom(struct file *filp, struct kobject *kobj, return count; } -static BIN_ATTR(rom, 0600, pci_read_rom, pci_write_rom, 0); +static const BIN_ATTR(rom, 0600, pci_read_rom, pci_write_rom, 0); -static struct bin_attribute *pci_dev_rom_attrs[] = { +static const struct bin_attribute *const pci_dev_rom_attrs[] = { &bin_attr_rom, NULL, }; @@ -1372,7 +1372,7 @@ static size_t pci_dev_rom_attr_bin_size(struct kobject *kobj, } static const struct attribute_group pci_dev_rom_attr_group = { - .bin_attrs = pci_dev_rom_attrs, + .bin_attrs_new = pci_dev_rom_attrs, .is_bin_visible = pci_dev_rom_attr_is_visible, .bin_size = pci_dev_rom_attr_bin_size, };