From: William Roberts <william.c.roberts@xxxxxxxxx>
On Android for both the host build, and the target, certain
backends are not needed:
- X Backend
- DB Backend
- Media Backend
Introduce the following defines for removing them from the
built library:
- NO_X_BACKEND
- NO_DB_BACKEND
- NO_MEDIA_BACKEND
When configured with these options and an attempt
is made to use them, selabel_open() will return
ENOTSUP.
Signed-off-by: William Roberts <william.c.roberts@xxxxxxxxx>
---
libselinux/src/label.c | 29 ++++++++++++++++++++++++++---
1 file changed, 26 insertions(+), 3 deletions(-)
diff --git a/libselinux/src/label.c b/libselinux/src/label.c
index 963bfcb..96a4ff1 100644
--- a/libselinux/src/label.c
+++ b/libselinux/src/label.c
@@ -17,15 +17,33 @@
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
+#ifdef NO_MEDIA_BACKEND
+#define CONFIG_MEDIA_BACKEND(fnptr) NULL
+#else
+#define CONFIG_MEDIA_BACKEND(fnptr) &fnptr
+#endif
+
+#ifdef NO_X_BACKEND
+#define CONFIG_X_BACKEND(fnptr) NULL
+#else
+#define CONFIG_X_BACKEND(fnptr) &fnptr
+#endif
+
+#ifdef NO_DB_BACKEND
+#define CONFIG_DB_BACKEND(fnptr) NULL
+#else
+#define CONFIG_DB_BACKEND(fnptr) &fnptr
+#endif
+
typedef int (*selabel_initfunc)(struct selabel_handle *rec,
const struct selinux_opt *opts,
unsigned nopts);
static selabel_initfunc initfuncs[] = {
&selabel_file_init,
- &selabel_media_init,
- &selabel_x_init,
- &selabel_db_init,
+ CONFIG_MEDIA_BACKEND(selabel_media_init),
+ CONFIG_X_BACKEND(selabel_x_init),
+ CONFIG_DB_BACKEND(selabel_db_init),
&selabel_property_init,
};
@@ -325,6 +343,11 @@ struct selabel_handle *selabel_open(unsigned int backend,
goto out;
}
+ if (!initfuncs[backend]) {
+ errno = ENOTSUP;
+ goto out;
+ }
+
rec = (struct selabel_handle *)malloc(sizeof(*rec));
if (!rec)
goto out;
--
1.9.1
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