linux-kernel - [PATCH v2 12/25] selinux: add hooks for fscaps operations

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Date: Wed, 21 Feb 2024 15:24:43 -0600
From: "Seth Forshee (DigitalOcean)" <sforshee@...nel.org>
To: Christian Brauner <brauner@...nel.org>, 
 Seth Forshee <sforshee@...nel.org>, Serge Hallyn <serge@...lyn.com>, 
 Paul Moore <paul@...l-moore.com>, Eric Paris <eparis@...hat.com>, 
 James Morris <jmorris@...ei.org>, Alexander Viro <viro@...iv.linux.org.uk>, 
 Jan Kara <jack@...e.cz>, Stephen Smalley <stephen.smalley.work@...il.com>, 
 Ondrej Mosnacek <omosnace@...hat.com>, 
 Casey Schaufler <casey@...aufler-ca.com>, Mimi Zohar <zohar@...ux.ibm.com>, 
 Roberto Sassu <roberto.sassu@...wei.com>, 
 Dmitry Kasatkin <dmitry.kasatkin@...il.com>, 
 Eric Snowberg <eric.snowberg@...cle.com>, 
 "Matthew Wilcox (Oracle)" <willy@...radead.org>, 
 Jonathan Corbet <corbet@....net>, Miklos Szeredi <miklos@...redi.hu>, 
 Amir Goldstein <amir73il@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org, 
 linux-security-module@...r.kernel.org, audit@...r.kernel.org, 
 selinux@...r.kernel.org, linux-integrity@...r.kernel.org, 
 linux-doc@...r.kernel.org, linux-unionfs@...r.kernel.org
Subject: [PATCH v2 12/25] selinux: add hooks for fscaps operations

Add hooks for set/get/remove fscaps operations which perform the same
checks as the xattr hooks would have done for XATTR_NAME_CAPS.

Signed-off-by: Seth Forshee (DigitalOcean) <sforshee@...nel.org>
---
 security/selinux/hooks.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index a6bf90ace84c..da129a387b34 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -3367,6 +3367,29 @@ static int selinux_inode_removexattr(struct mnt_idmap *idmap,
 	return -EACCES;
 }
 
+static int selinux_inode_set_fscaps(struct mnt_idmap *idmap,
+				    struct dentry *dentry,
+				    const struct vfs_caps *caps, int flags)
+{
+	return dentry_has_perm(current_cred(), dentry, FILE__SETATTR);
+}
+
+static int selinux_inode_get_fscaps(struct mnt_idmap *idmap,
+				    struct dentry *dentry)
+{
+	return dentry_has_perm(current_cred(), dentry, FILE__GETATTR);
+}
+
+static int selinux_inode_remove_fscaps(struct mnt_idmap *idmap,
+				       struct dentry *dentry)
+{
+	int rc = cap_inode_removexattr(idmap, dentry, XATTR_NAME_CAPS);
+	if (rc)
+		return rc;
+
+	return dentry_has_perm(current_cred(), dentry, FILE__SETATTR);
+}
+
 static int selinux_path_notify(const struct path *path, u64 mask,
 						unsigned int obj_type)
 {
@@ -7165,6 +7188,9 @@ static struct security_hook_list selinux_hooks[] __ro_after_init = {
 	LSM_HOOK_INIT(inode_set_acl, selinux_inode_set_acl),
 	LSM_HOOK_INIT(inode_get_acl, selinux_inode_get_acl),
 	LSM_HOOK_INIT(inode_remove_acl, selinux_inode_remove_acl),
+	LSM_HOOK_INIT(inode_set_fscaps, selinux_inode_set_fscaps),
+	LSM_HOOK_INIT(inode_get_fscaps, selinux_inode_get_fscaps),
+	LSM_HOOK_INIT(inode_remove_fscaps, selinux_inode_remove_fscaps),
 	LSM_HOOK_INIT(inode_getsecurity, selinux_inode_getsecurity),
 	LSM_HOOK_INIT(inode_setsecurity, selinux_inode_setsecurity),
 	LSM_HOOK_INIT(inode_listsecurity, selinux_inode_listsecurity),

-- 
2.43.0