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Feb 2025 15:43:32 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: [PATCH 1/2] configfs: Add mechanism to prevent symlink deletion To: =?utf-8?b?Sm9zw6kgRXhww7NzaXRv?= Cc: hamohammed.sa@gmail.com, simona@ffwll.ch, melissa.srw@gmail.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org References: <20250225175936.7223-1-jose.exposito89@gmail.com> <20250225175936.7223-4-jose.exposito89@gmail.com> Content-Language: en-US From: Louis Chauvet Autocrypt: addr=louis.chauvet@bootlin.com; keydata= xsFNBGCG5KEBEAD1yQ5C7eS4rxD0Wj7JRYZ07UhWTbBpbSjHjYJQWx/qupQdzzxe6sdrxYSY 5K81kIWbtQX91pD/wH5UapRF4kwMXTAqof8+m3XfYcEDVG31Kf8QkJTG/gLBi1UfJgGBahbY hjP40kuUR/mr7M7bKoBP9Uh0uaEM+DuKl6bSXMSrJ6fOtEPOtnfBY0xVPmqIKfLFEkjh800v jD1fdwWKtAIXf+cQtC9QWvcdzAmQIwmyFBmbg+ccqao1OIXTgu+qMAHfgKDjYctESvo+Szmb DFBZudPbyTAlf2mVKpoHKMGy3ndPZ19RboKUP0wjrF+Snif6zRFisHK7D/mqpgUftoV4HjEH 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gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgdeltdeiiecutefuodetggdotefrodftvfcurfhrohhfihhlvgemucfitefpfffkpdcuggftfghnshhusghstghrihgsvgenuceurghilhhouhhtmecufedtudenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhepkfffgggfuffvvehfhfgjtgfgsehtjeertddtvdejnecuhfhrohhmpefnohhuihhsucevhhgruhhvvghtuceolhhouhhishdrtghhrghuvhgvthessghoohhtlhhinhdrtghomheqnecuggftrfgrthhtvghrnhepgfffveeuudeuhfekteeuhefhhedtleejgeehheduheeigfejteetueeifeehveevnecukfhppeeltddrkeelrdduieefrdduvdejnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepledtrdekledrudeifedruddvjedphhgvlhhopegludelvddrudeikedrtddrvddtngdpmhgrihhlfhhrohhmpehlohhuihhsrdgthhgruhhvvghtsegsohhothhlihhnrdgtohhmpdhnsggprhgtphhtthhopedutddprhgtphhtthhopehjohhsvgdrvgigphhoshhithhokeelsehgmhgrihhlrdgtohhmpdhrtghpthhtohephhgrmhhohhgrmhhmvggurdhsrgesghhmrghilhdrtghomhdprhgtphhtthhopehsihhmohhnrgesfhhffihllhdrtghhpdhrtghpthhtohepmhgvlhhishhsrgdrshhrfiesghhmrghilhdrtghomhdprhgtphhtthhopehmrggrrhhtvghnrdhlrghnkhhhohhrshhtsehlihhnu higrdhinhhtvghlrdgtohhmpdhrtghpthhtohepmhhrihhprghrugeskhgvrhhnvghlrdhorhhgpdhrtghpthhtohepthiiihhmmhgvrhhmrghnnhesshhushgvrdguvgdprhgtphhtthhopegrihhrlhhivggusehgmhgrihhlrdgtohhm X-GND-Sasl: louis.chauvet@bootlin.com X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Introduce a new mechanism in configfs to prevent the deletion of certain symlink. This is particularly useful in scenarios where userspace should not be allowed to modify the configfs structure under some conditions, such as in VKMS. Signed-off-by: Louis Chauvet --- drivers/gpu/drm/vkms/vkms_configfs.c | 20 ++++++++++++++++++++ fs/configfs/symlink.c | 12 +++++++++--- include/linux/configfs.h | 1 + 3 files changed, 30 insertions(+), 3 deletions(-) }; diff --git a/drivers/gpu/drm/vkms/vkms_configfs.c b/drivers/gpu/drm/vkms/vkms_configfs.c index f0813536be12..8a7d954399e9 100644 --- a/drivers/gpu/drm/vkms/vkms_configfs.c +++ b/drivers/gpu/drm/vkms/vkms_configfs.c @@ -295,8 +295,28 @@ static void plane_possible_crtcs_drop_link(struct config_item *src, mutex_unlock(&plane->dev->lock); } +static int plane_possible_crtcs_allow_drop_link(struct config_item *src, + struct config_item *target) +{ + struct vkms_configfs_plane *plane; + struct vkms_configfs_crtc *crtc; + bool enabled; + + plane = plane_possible_crtcs_item_to_vkms_configfs_plane(src); + crtc = crtc_item_to_vkms_configfs_crtc(target); + + mutex_lock(&plane->dev->lock); + enabled = plane->dev->enabled; + mutex_unlock(&plane->dev->lock); + + if (enabled) + return -EBUSY; + return 0; +} + static struct configfs_item_operations plane_possible_crtcs_item_operations = { .allow_link = plane_possible_crtcs_allow_link, + .allow_drop_link = plane_possible_crtcs_allow_drop_link, .drop_link = plane_possible_crtcs_drop_link, }; diff --git a/fs/configfs/symlink.c b/fs/configfs/symlink.c index 69133ec1fac2..925e2e15eb9b 100644 --- a/fs/configfs/symlink.c +++ b/fs/configfs/symlink.c @@ -233,6 +233,13 @@ int configfs_unlink(struct inode *dir, struct dentry *dentry) parent_item = configfs_get_config_item(dentry->d_parent); type = parent_item->ci_type; + if (type && type->ct_item_ops && + type->ct_item_ops->allow_drop_link) { + ret = type->ct_item_ops->allow_drop_link(parent_item, target_sd->s_element); + if (ret) + goto out_put; + } + spin_lock(&configfs_dirent_lock); list_del_init(&sd->s_sibling); spin_unlock(&configfs_dirent_lock); @@ -255,10 +262,9 @@ int configfs_unlink(struct inode *dir, struct dentry *dentry) spin_unlock(&configfs_dirent_lock); configfs_put(target_sd); - config_item_put(parent_item); - ret = 0; - +out_put: + config_item_put(parent_item); out: return ret; } diff --git a/include/linux/configfs.h b/include/linux/configfs.h index c771e9d0d0b9..7fc52a78d6cd 100644 --- a/include/linux/configfs.h +++ b/include/linux/configfs.h @@ -208,6 +208,7 @@ static struct configfs_bin_attribute _pfx##attr_##_name = { \ struct configfs_item_operations { void (*release)(struct config_item *); int (*allow_link)(struct config_item *src, struct config_item *target); + int (*allow_drop_link)(struct config_item *src, struct config_item *target); void (*drop_link)(struct config_item *src, struct config_item *target); From patchwork Fri Feb 28 14:43:27 2025 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Louis Chauvet X-Patchwork-Id: 13996547 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: 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tzimmermann@suse.de, airlied@gmail.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org References: <20250225175936.7223-1-jose.exposito89@gmail.com> <20250225175936.7223-4-jose.exposito89@gmail.com> Content-Language: en-US From: Louis Chauvet Autocrypt: addr=louis.chauvet@bootlin.com; keydata= xsFNBGCG5KEBEAD1yQ5C7eS4rxD0Wj7JRYZ07UhWTbBpbSjHjYJQWx/qupQdzzxe6sdrxYSY 5K81kIWbtQX91pD/wH5UapRF4kwMXTAqof8+m3XfYcEDVG31Kf8QkJTG/gLBi1UfJgGBahbY hjP40kuUR/mr7M7bKoBP9Uh0uaEM+DuKl6bSXMSrJ6fOtEPOtnfBY0xVPmqIKfLFEkjh800v jD1fdwWKtAIXf+cQtC9QWvcdzAmQIwmyFBmbg+ccqao1OIXTgu+qMAHfgKDjYctESvo+Szmb DFBZudPbyTAlf2mVKpoHKMGy3ndPZ19RboKUP0wjrF+Snif6zRFisHK7D/mqpgUftoV4HjEH bQO9bTJZXIoPJMSb+Lyds0m83/LYfjcWP8w889bNyD4Lzzzu+hWIu/OObJeGEQqY01etOLMh deuSuCG9tFr0DY6l37d4VK4dqq4Snmm87IRCb3AHAEMJ5SsO8WmRYF8ReLIk0tJJPrALv8DD lnLnwadBJ9H8djZMj24+GC6MJjN8dDNWctpBXgGZKuCM7Ggaex+RLHP/+14Vl+lSLdFiUb3U ljBXuc9v5/9+D8fWlH03q+NCa1dVgUtsP2lpolOV3EE85q1HdMyt5K91oB0hLNFdTFYwn1bW 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uQkNLDVcjgD2fxBpemT7EhHYBz+ugsfbtdsH+4jVCo5WLb/HxE6o5zvSIkXknWh1DhFj/qe9 Zb9PGmfp8T8Ty+c/hjE5x6SrkRCX8qPXIvfSWLlb8M0lpcpFK+tB+kZlu5I3ycQDNLTk3qmf PdjUMWb5Ld21PSyCrtGc/hTKwxMoHsOZPy6UB8YJ5omZdsavcjKMrDpybguOfxUmGYs2H3MJ ghIUQMMOe0267uQcmMNDPRueGWTLXcuyz0Tpe62Whekc3gNMl0JrNz6Gty8OBb/ETijfSHPE qGHYuyAZJo9A/IazHuJ+4n+gm4kQl1WLfxoRMzYHCA== In-Reply-To: <20250225175936.7223-4-jose.exposito89@gmail.com> X-GND-State: clean X-GND-Score: -100 X-GND-Cause: gggruggvucftvghtrhhoucdtuddrgeefvddrtddtgdeltdeiiecutefuodetggdotefrodftvfcurfhrohhfihhlvgemucfitefpfffkpdcuggftfghnshhusghstghrihgsvgenuceurghilhhouhhtmecufedtudenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujfgurhepkfffgggfuffvvehfhfgjtgfgsehtjeertddtvdejnecuhfhrohhmpefnohhuihhsucevhhgruhhvvghtuceolhhouhhishdrtghhrghuvhgvthessghoohhtlhhinhdrtghomheqnecuggftrfgrthhtvghrnhepgfffveeuudeuhfekteeuhefhhedtleejgeehheduheeigfejteetueeifeehveevnecukfhppeeltddrkeelrdduieefrdduvdejnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehinhgvthepledtrdekledrudeifedruddvjedphhgvlhhopegludelvddrudeikedrtddrvddtngdpmhgrihhlfhhrohhmpehlohhuihhsrdgthhgruhhvvghtsegsohhothhlihhnrdgtohhmpdhnsggprhgtphhtthhopedutddprhgtphhtthhopehjohhsvgdrvgigphhoshhithhokeelsehgmhgrihhlrdgtohhmpdhrtghpthhtohephhgrmhhohhgrmhhmvggurdhsrgesghhmrghilhdrtghomhdprhgtphhtthhopehsihhmohhnrgesfhhffihllhdrtghhpdhrtghpthhtohepmhgvlhhishhsrgdrshhrfiesghhmrghilhdrtghomhdprhgtphhtthhopehmrggrrhhtvghnrdhlrghnkhhhohhrshhtsehlihhnu higrdhinhhtvghlrdgtohhmpdhrtghpthhtohepmhhrihhprghrugeskhgvrhhnvghlrdhorhhgpdhrtghpthhtohepthiiihhmmhgvrhhmrghnnhesshhushgvrdguvgdprhgtphhtthhopegrihhrlhhivggusehgmhgrihhlrdgtohhm X-GND-Sasl: louis.chauvet@bootlin.com X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Introduce a new mechanism in configfs to prevent the deletion of certain item/group. This is particularly useful in scenarios where userspace should not be allowed to modify the configfs structure under some conditions, such as in VKMS. Signed-off-by: Louis Chauvet --- drivers/gpu/drm/vkms/vkms_configfs.c | 21 +++++++++++++++++++++ fs/configfs/dir.c | 8 +++++++- include/linux/configfs.h | 1 + 3 files changed, 29 insertions(+), 1 deletion(-) *item); void (*drop_item)(struct config_group *group, struct config_item *item); bool (*is_visible)(struct config_item *item, struct configfs_attribute *attr, int n); bool (*is_bin_visible)(struct config_item *item, struct configfs_bin_attribute *attr, diff --git a/drivers/gpu/drm/vkms/vkms_configfs.c b/drivers/gpu/drm/vkms/vkms_configfs.c index 8a7d954399e9..0a196a28ed4a 100644 --- a/drivers/gpu/drm/vkms/vkms_configfs.c +++ b/drivers/gpu/drm/vkms/vkms_configfs.c @@ -393,9 +393,30 @@ static struct configfs_item_operations plane_item_operations = { .release = &plane_release, }; +int allow_drop_plane_group(struct config_group *group, struct config_item *item) +{ + struct vkms_configfs_plane *plane; + bool enabled; + + plane = plane_item_to_vkms_configfs_plane(item); + + mutex_lock(&plane->dev->lock); + enabled = plane->dev->enabled; + mutex_unlock(&plane->dev->lock); + + if (enabled) + return -EBUSY; + return 0; +} + +static struct configfs_group_operations plane_group_operation ={ + .allow_drop_item = &allow_drop_plane_group, +}; + static const struct config_item_type plane_item_type = { .ct_attrs = plane_item_attrs, .ct_item_ops = &plane_item_operations, + .ct_group_ops = &plane_group_operation, .ct_owner = THIS_MODULE, }; diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c index 7d10278db30d..a103196af0f9 100644 --- a/fs/configfs/dir.c +++ b/fs/configfs/dir.c @@ -1544,7 +1544,13 @@ static int configfs_rmdir(struct inode *dir, struct dentry *dentry) /* Drop reference from above, item already holds one. */ config_item_put(parent_item); - + if (item->ci_type && item->ci_type->ct_group_ops && item->ci_type->ct_group_ops->allow_drop_item) { + ret = item->ci_type->ct_group_ops->allow_drop_item(to_config_group(parent_item), item); + if (ret) { + config_item_put(item); + return ret; + } + } if (item->ci_type) dead_item_owner = item->ci_type->ct_owner; diff --git a/include/linux/configfs.h b/include/linux/configfs.h index 7fc52a78d6cd..92933397590d 100644 --- a/include/linux/configfs.h +++ b/include/linux/configfs.h @@ -216,6 +216,7 @@ struct configfs_group_operations { struct config_item *(*make_item)(struct config_group *group, const char *name); struct config_group *(*make_group)(struct config_group *group, const char *name); void (*disconnect_notify)(struct config_group *group, struct config_item *item); + int (*allow_drop_item)(struct config_group *group, struct config_item