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libselinux: introduce configurable backends

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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@intel.com>
This commit is contained in:
William Roberts 2016-09-26 10:33:38 -07:00 committed by Stephen Smalley
parent a982bc61b5
commit 84d07ebd48
1 changed files with 26 additions and 3 deletions
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29
libselinux/src/label.c
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@ -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;