summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorMiklos Szeredi <mszeredi@redhat.com>2020-12-14 15:26:13 +0100
committerMiklos Szeredi <mszeredi@redhat.com>2020-12-14 15:26:13 +0100
commit7c03e2cda4a584cadc398e8f6641ca9988a39d52 (patch)
treefb00450cfbec40734c00495f1715fdf4d8b2d873
parentc11faf32599fee59f33896c8d59f9b3c17ca76fc (diff)
downloadlinux-7c03e2cda4a584cadc398e8f6641ca9988a39d52.tar.bz2
vfs: move cap_convert_nscap() call into vfs_setxattr()
cap_convert_nscap() does permission checking as well as conversion of the xattr value conditionally based on fs's user-ns. This is needed by overlayfs and probably other layered fs (ecryptfs) and is what vfs_foo() is supposed to do anyway. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Acked-by: James Morris <jamorris@linux.microsoft.com>
-rw-r--r--fs/xattr.c17
-rw-r--r--include/linux/capability.h2
-rw-r--r--security/commoncap.c3
3 files changed, 13 insertions, 9 deletions
diff --git a/fs/xattr.c b/fs/xattr.c
index cd7a563e8bcd..fd57153b1f61 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -276,8 +276,16 @@ vfs_setxattr(struct dentry *dentry, const char *name, const void *value,
{
struct inode *inode = dentry->d_inode;
struct inode *delegated_inode = NULL;
+ const void *orig_value = value;
int error;
+ if (size && strcmp(name, XATTR_NAME_CAPS) == 0) {
+ error = cap_convert_nscap(dentry, &value, size);
+ if (error < 0)
+ return error;
+ size = error;
+ }
+
retry_deleg:
inode_lock(inode);
error = __vfs_setxattr_locked(dentry, name, value, size, flags,
@@ -289,6 +297,9 @@ retry_deleg:
if (!error)
goto retry_deleg;
}
+ if (value != orig_value)
+ kfree(value);
+
return error;
}
EXPORT_SYMBOL_GPL(vfs_setxattr);
@@ -537,12 +548,6 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value,
if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) ||
(strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0))
posix_acl_fix_xattr_from_user(kvalue, size);
- else if (strcmp(kname, XATTR_NAME_CAPS) == 0) {
- error = cap_convert_nscap(d, &kvalue, size);
- if (error < 0)
- goto out;
- size = error;
- }
}
error = vfs_setxattr(d, kname, kvalue, size, flags);
diff --git a/include/linux/capability.h b/include/linux/capability.h
index 1e7fe311cabe..b2f698915c0f 100644
--- a/include/linux/capability.h
+++ b/include/linux/capability.h
@@ -270,6 +270,6 @@ static inline bool checkpoint_restore_ns_capable(struct user_namespace *ns)
/* audit system wants to get cap info from files as well */
extern int get_vfs_caps_from_disk(const struct dentry *dentry, struct cpu_vfs_cap_data *cpu_caps);
-extern int cap_convert_nscap(struct dentry *dentry, void **ivalue, size_t size);
+extern int cap_convert_nscap(struct dentry *dentry, const void **ivalue, size_t size);
#endif /* !_LINUX_CAPABILITY_H */
diff --git a/security/commoncap.c b/security/commoncap.c
index 59bf3c1674c8..bacc1111d871 100644
--- a/security/commoncap.c
+++ b/security/commoncap.c
@@ -473,7 +473,7 @@ static bool validheader(size_t size, const struct vfs_cap_data *cap)
*
* If all is ok, we return the new size, on error return < 0.
*/
-int cap_convert_nscap(struct dentry *dentry, void **ivalue, size_t size)
+int cap_convert_nscap(struct dentry *dentry, const void **ivalue, size_t size)
{
struct vfs_ns_cap_data *nscap;
uid_t nsrootid;
@@ -516,7 +516,6 @@ int cap_convert_nscap(struct dentry *dentry, void **ivalue, size_t size)
nscap->magic_etc = cpu_to_le32(nsmagic);
memcpy(&nscap->data, &cap->data, sizeof(__le32) * 2 * VFS_CAP_U32);
- kvfree(*ivalue);
*ivalue = nscap;
return newsize;
}