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Diffstat (limited to 'qemu/hw/9pfs/9p-xattr-user.c')
-rw-r--r--qemu/hw/9pfs/9p-xattr-user.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/qemu/hw/9pfs/9p-xattr-user.c b/qemu/hw/9pfs/9p-xattr-user.c
new file mode 100644
index 000000000..f87530c8b
--- /dev/null
+++ b/qemu/hw/9pfs/9p-xattr-user.c
@@ -0,0 +1,127 @@
+/*
+ * 9p user. xattr callback
+ *
+ * Copyright IBM, Corp. 2010
+ *
+ * Authors:
+ * Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "9p.h"
+#include "fsdev/file-op-9p.h"
+#include "9p-xattr.h"
+
+
+static ssize_t mp_user_getxattr(FsContext *ctx, const char *path,
+ const char *name, void *value, size_t size)
+{
+ char *buffer;
+ ssize_t ret;
+
+ if (strncmp(name, "user.virtfs.", 12) == 0) {
+ /*
+ * Don't allow fetch of user.virtfs namesapce
+ * in case of mapped security
+ */
+ errno = ENOATTR;
+ return -1;
+ }
+ buffer = rpath(ctx, path);
+ ret = lgetxattr(buffer, name, value, size);
+ g_free(buffer);
+ return ret;
+}
+
+static ssize_t mp_user_listxattr(FsContext *ctx, const char *path,
+ char *name, void *value, size_t size)
+{
+ int name_size = strlen(name) + 1;
+ if (strncmp(name, "user.virtfs.", 12) == 0) {
+
+ /* check if it is a mapped posix acl */
+ if (strncmp(name, "user.virtfs.system.posix_acl_", 29) == 0) {
+ /* adjust the name and size */
+ name += 12;
+ name_size -= 12;
+ } else {
+ /*
+ * Don't allow fetch of user.virtfs namesapce
+ * in case of mapped security
+ */
+ return 0;
+ }
+ }
+ if (!value) {
+ return name_size;
+ }
+
+ if (size < name_size) {
+ errno = ERANGE;
+ return -1;
+ }
+
+ /* name_size includes the trailing NUL. */
+ memcpy(value, name, name_size);
+ return name_size;
+}
+
+static int mp_user_setxattr(FsContext *ctx, const char *path, const char *name,
+ void *value, size_t size, int flags)
+{
+ char *buffer;
+ int ret;
+
+ if (strncmp(name, "user.virtfs.", 12) == 0) {
+ /*
+ * Don't allow fetch of user.virtfs namesapce
+ * in case of mapped security
+ */
+ errno = EACCES;
+ return -1;
+ }
+ buffer = rpath(ctx, path);
+ ret = lsetxattr(buffer, name, value, size, flags);
+ g_free(buffer);
+ return ret;
+}
+
+static int mp_user_removexattr(FsContext *ctx,
+ const char *path, const char *name)
+{
+ char *buffer;
+ int ret;
+
+ if (strncmp(name, "user.virtfs.", 12) == 0) {
+ /*
+ * Don't allow fetch of user.virtfs namesapce
+ * in case of mapped security
+ */
+ errno = EACCES;
+ return -1;
+ }
+ buffer = rpath(ctx, path);
+ ret = lremovexattr(buffer, name);
+ g_free(buffer);
+ return ret;
+}
+
+XattrOperations mapped_user_xattr = {
+ .name = "user.",
+ .getxattr = mp_user_getxattr,
+ .setxattr = mp_user_setxattr,
+ .listxattr = mp_user_listxattr,
+ .removexattr = mp_user_removexattr,
+};
+
+XattrOperations passthrough_user_xattr = {
+ .name = "user.",
+ .getxattr = pt_getxattr,
+ .setxattr = pt_setxattr,
+ .listxattr = pt_listxattr,
+ .removexattr = pt_removexattr,
+};