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Wed, 21 Feb 2024 21:25:07 +0000 (UTC) From: "Seth Forshee (DigitalOcean)" Date: Wed, 21 Feb 2024 15:24:50 -0600 Subject: [PATCH v2 19/25] fs: add vfs_remove_fscaps() Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20240221-idmap-fscap-refactor-v2-19-3039364623bd@kernel.org> References: <20240221-idmap-fscap-refactor-v2-0-3039364623bd@kernel.org> In-Reply-To: <20240221-idmap-fscap-refactor-v2-0-3039364623bd@kernel.org> To: Christian Brauner , Seth Forshee , Serge Hallyn , Paul Moore , Eric Paris , James Morris , Alexander Viro , Jan Kara , Stephen Smalley , Ondrej Mosnacek , Casey Schaufler , Mimi Zohar , Roberto Sassu , Dmitry Kasatkin , Eric Snowberg , "Matthew Wilcox (Oracle)" , Jonathan Corbet , Miklos Szeredi , Amir Goldstein Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-security-module@vger.kernel.org, audit@vger.kernel.org, selinux@vger.kernel.org, linux-integrity@vger.kernel.org, linux-doc@vger.kernel.org, linux-unionfs@vger.kernel.org X-Mailer: b4 0.12.4 X-Developer-Signature: v=1; a=openpgp-sha256; l=3779; i=sforshee@kernel.org; h=from:subject:message-id; bh=a3ugvMhATksPxV+a7Wcb3fojtkXnejQOJKEmfG2Au6A=; =?utf-8?q?b=3DowEBbQGS/pANAwAKAVMDma7l9DHJAcsmYgBl1mopgDVenhi3VLPaPvFwxM95t?= =?utf-8?q?qNAaxCLXvBKa+2y_76GFlFmJATMEAAEKAB0WIQSQnt+rKAvnETy4Hc9TA5mu5fQxy?= =?utf-8?q?QUCZdZqKQAKCRBTA5mu5fQxyQftB/_0eV/oZCodcvmT2NzrSTKkvLIWCpVU5YGKGF?= =?utf-8?q?ugW3HG3lJRUuGtO+t+A3RwZKzOSWbtk1CkbGAetJWXa_aqqprqjsUstKaAApbpfZo?= =?utf-8?q?Z+eK6TN/rCUWHcGfXJrwsSbxogu7GRc2n0qYaSlu+qA3xEzF8z6c/Ddpr_k/Dc7FV?= =?utf-8?q?T0eukTELGcPFhqthrQZQwUPUa27SB4BCSgNW5nS3MQFGNmL3komWpIDaUw1t7zzje?= =?utf-8?q?PB3Q8p_Sd6mViD54RmlcUD/RuxaNacNOjFHyQ0gXUwF/iAQuoi0uwi4vkFeECAIEt?= =?utf-8?q?6niPSkeZ/0OqmUxINUBZ?= jM1eqVetaMefnRdsKXRtEreKVXPamw X-Developer-Key: i=sforshee@kernel.org; a=openpgp; fpr=2ABCA7498D83E1D32D51D3B5AB4800A62DB9F73A X-Endpoint-Received: by B4 Relay for sforshee@kernel.org/default with auth_id=103 Provide a type-safe interface for removing filesystem capabilities and a generic implementation suitable for most filesystems. Also add an internal interface, vfs_remove_fscaps_nosec(), which is called with the inode lock held and skips security checks for later use from the capability code. Signed-off-by: Seth Forshee (DigitalOcean) --- fs/xattr.c | 81 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/fs.h | 2 ++ 2 files changed, 83 insertions(+) diff --git a/fs/xattr.c b/fs/xattr.c index 96de43928a51..8b0f7384cbc9 100644 --- a/fs/xattr.c +++ b/fs/xattr.c @@ -324,6 +324,87 @@ int vfs_set_fscaps(struct mnt_idmap *idmap, struct dentry *dentry, } EXPORT_SYMBOL(vfs_set_fscaps); +static int generic_remove_fscaps(struct mnt_idmap *idmap, struct dentry *dentry) +{ + return __vfs_removexattr(idmap, dentry, XATTR_NAME_CAPS); +} + +/** + * vfs_remove_fscaps_nosec - remove filesystem capabilities without + * security checks + * @idmap: idmap of the mount the inode was found from + * @dentry: the dentry from which to remove filesystem capabilities + * + * This function removes any filesystem capabilities from the specified + * dentry. Does not perform any security checks, and callers must hold the + * inode lock. + * + * Return: 0 on success, a negative errno on error. + */ +int vfs_remove_fscaps_nosec(struct mnt_idmap *idmap, struct dentry *dentry) +{ + struct inode *inode = dentry->d_inode; + int error; + + if (inode->i_op->set_fscaps) + error = inode->i_op->set_fscaps(idmap, dentry, NULL, + XATTR_REPLACE); + else + error = generic_remove_fscaps(idmap, dentry); + + return error; +} + +/** + * vfs_remove_fscaps - remove filesystem capabilities + * @idmap: idmap of the mount the inode was found from + * @dentry: the dentry from which to remove filesystem capabilities + * + * This function removes any filesystem capabilities from the specified + * dentry. + * + * Return: 0 on success, a negative errno on error. + */ +int vfs_remove_fscaps(struct mnt_idmap *idmap, struct dentry *dentry) +{ + struct inode *inode = dentry->d_inode; + struct inode *delegated_inode = NULL; + int error; + +retry_deleg: + inode_lock(inode); + + error = xattr_permission(idmap, inode, XATTR_NAME_CAPS, MAY_WRITE); + if (error) + goto out_inode_unlock; + + error = security_inode_remove_fscaps(idmap, dentry); + if (error) + goto out_inode_unlock; + + error = try_break_deleg(inode, &delegated_inode); + if (error) + goto out_inode_unlock; + + error = vfs_remove_fscaps_nosec(idmap, dentry); + if (!error) { + fsnotify_xattr(dentry); + evm_inode_post_remove_fscaps(dentry); + } + +out_inode_unlock: + inode_unlock(inode); + + if (delegated_inode) { + error = break_deleg_wait(&delegated_inode); + if (!error) + goto retry_deleg; + } + + return error; +} +EXPORT_SYMBOL(vfs_remove_fscaps); + int __vfs_setxattr(struct mnt_idmap *idmap, struct dentry *dentry, struct inode *inode, const char *name, const void *value, diff --git a/include/linux/fs.h b/include/linux/fs.h index 4f5d7ed44644..c07427d2fc71 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -2122,6 +2122,8 @@ extern int vfs_get_fscaps(struct mnt_idmap *idmap, struct dentry *dentry, struct vfs_caps *caps); extern int vfs_set_fscaps(struct mnt_idmap *idmap, struct dentry *dentry, const struct vfs_caps *caps, int setxattr_flags); +extern int vfs_remove_fscaps_nosec(struct mnt_idmap *idmap, struct dentry *dentry); +extern int vfs_remove_fscaps(struct mnt_idmap *idmap, struct dentry *dentry); /** * enum freeze_holder - holder of the freeze -- 2.43.0