linux-kernel - [PATCH v3 19/25] commoncap: handle fsid mappings with vfs caps

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Date:   Tue, 18 Feb 2020 15:34:05 +0100
From:   Christian Brauner <christian.brauner@...ntu.com>
To:     Stéphane Graber <stgraber@...ntu.com>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        Aleksa Sarai <cyphar@...har.com>, Jann Horn <jannh@...gle.com>
Cc:     smbarber@...omium.org, Seth Forshee <seth.forshee@...onical.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Serge Hallyn <serge@...lyn.com>,
        James Morris <jmorris@...ei.org>,
        Kees Cook <keescook@...omium.org>,
        Jonathan Corbet <corbet@....net>,
        Phil Estes <estesp@...il.com>, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org,
        containers@...ts.linux-foundation.org,
        linux-security-module@...r.kernel.org, linux-api@...r.kernel.org,
        Christian Brauner <christian.brauner@...ntu.com>
Subject: [PATCH v3 19/25] commoncap: handle fsid mappings with vfs caps

Switch vfs cap helpers to lookup fsids in the fsid mappings. If no fsid
mappings are setup the behavior is unchanged, i.e. fsids are looked up in the
id mappings.

Signed-off-by: Christian Brauner <christian.brauner@...ntu.com>
---
/* v2 */
unchanged

/* v3 */
unchanged
---
 security/commoncap.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/security/commoncap.c b/security/commoncap.c
index 0581c6aa8bdc..d2259dc0450b 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -328,7 +328,7 @@ static bool rootid_owns_currentns(kuid_t kroot)
 		return false;
 
 	for (ns = current_user_ns(); ; ns = ns->parent) {
-		if (from_kuid(ns, kroot) == 0)
+		if (from_kfsuid(ns, kroot) == 0)
 			return true;
 		if (ns == &init_user_ns)
 			break;
@@ -411,11 +411,11 @@ int cap_inode_getsecurity(struct inode *inode, const char *name, void **buffer,
 
 	nscap = (struct vfs_ns_cap_data *) tmpbuf;
 	root = le32_to_cpu(nscap->rootid);
-	kroot = make_kuid(fs_ns, root);
+	kroot = make_kfsuid(fs_ns, root);
 
-	/* If the root kuid maps to a valid uid in current ns, then return
+	/* If the root kfsuid maps to a valid uid in current ns, then return
 	 * this as a nscap. */
-	mappedroot = from_kuid(current_user_ns(), kroot);
+	mappedroot = from_kfsuid(current_user_ns(), kroot);
 	if (mappedroot != (uid_t)-1 && mappedroot != (uid_t)0) {
 		if (alloc) {
 			*buffer = tmpbuf;
@@ -460,7 +460,7 @@ static kuid_t rootid_from_xattr(const void *value, size_t size,
 	if (size == XATTR_CAPS_SZ_3)
 		rootid = le32_to_cpu(nscap->rootid);
 
-	return make_kuid(task_ns, rootid);
+	return make_kfsuid(task_ns, rootid);
 }
 
 static bool validheader(size_t size, const struct vfs_cap_data *cap)
@@ -501,7 +501,7 @@ int cap_convert_nscap(struct dentry *dentry, void **ivalue, size_t size)
 	if (!uid_valid(rootid))
 		return -EINVAL;
 
-	nsrootid = from_kuid(fs_ns, rootid);
+	nsrootid = from_kfsuid(fs_ns, rootid);
 	if (nsrootid == -1)
 		return -EINVAL;
 
@@ -600,7 +600,7 @@ int get_vfs_caps_from_disk(const struct dentry *dentry, struct cpu_vfs_cap_data
 
 	cpu_caps->magic_etc = magic_etc = le32_to_cpu(caps->magic_etc);
 
-	rootkuid = make_kuid(fs_ns, 0);
+	rootkuid = make_kfsuid(fs_ns, 0);
 	switch (magic_etc & VFS_CAP_REVISION_MASK) {
 	case VFS_CAP_REVISION_1:
 		if (size != XATTR_CAPS_SZ_1)
@@ -616,7 +616,7 @@ int get_vfs_caps_from_disk(const struct dentry *dentry, struct cpu_vfs_cap_data
 		if (size != XATTR_CAPS_SZ_3)
 			return -EINVAL;
 		tocopy = VFS_CAP_U32_3;
-		rootkuid = make_kuid(fs_ns, le32_to_cpu(nscaps->rootid));
+		rootkuid = make_kfsuid(fs_ns, le32_to_cpu(nscaps->rootid));
 		break;
 
 	default:
-- 
2.25.0