Add support for filesystem capabilities.

Modify android_filesystem_config.h and add a capabilities
field. This field can be used to add filesystem capabilities
to a particular file.

Change-Id: If8953a322457ea7275aa6df75660b714e6dc678a

2 files changed, 63 insertions, 58 deletions

diff --git a/cpio/mkbootfs.c b/cpio/mkbootfs.c
index 323a09d6e..3569e27f4 100644
--- a/cpio/mkbootfs.c
+++ b/cpio/mkbootfs.c
@@ -55,6 +55,7 @@ static int total_size = 0;
 
 static void fix_stat(const char *path, struct stat *s)
 {
+    uint64_t capabilities;
     if (canned_config) {
         // Use the list of file uid/gid/modes loaded from the file
         // given with -f.
@@ -78,7 +79,7 @@ static void fix_stat(const char *path, struct stat *s)
     } else {
         // Use the compiled-in fs_config() function.
 
-        fs_config(path, S_ISDIR(s->st_mode), &s->st_uid, &s->st_gid, &s->st_mode);
+        fs_config(path, S_ISDIR(s->st_mode), &s->st_uid, &s->st_gid, &s->st_mode, &capabilities);
     }
 }
 
diff --git a/include/private/android_filesystem_config.h b/include/private/android_filesystem_config.h
index 746bec33f..32ed170b3 100644
--- a/include/private/android_filesystem_config.h
+++ b/include/private/android_filesystem_config.h
@@ -25,6 +25,8 @@
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/types.h>
+#include <stdint.h>
+#include <linux/capability.h>
 
 /* This is the master Users and Groups config for the platform.
 ** DO NOT EVER RENUMBER.
@@ -152,6 +154,7 @@ struct fs_path_config {
     unsigned mode;
     unsigned uid;
     unsigned gid;
+    uint64_t capabilities;
     const char *prefix;
 };
 
@@ -161,26 +164,26 @@ struct fs_path_config {
 ** way up to the root.
 */
 
-static struct fs_path_config android_dirs[] = {
-    { 00770, AID_SYSTEM, AID_CACHE,  "cache" },
-    { 00771, AID_SYSTEM, AID_SYSTEM, "data/app" },
-    { 00771, AID_SYSTEM, AID_SYSTEM, "data/app-private" },
-    { 00771, AID_SYSTEM, AID_SYSTEM, "data/dalvik-cache" },
-    { 00771, AID_SYSTEM, AID_SYSTEM, "data/data" },
-    { 00771, AID_SHELL,  AID_SHELL,  "data/local/tmp" },
-    { 00771, AID_SHELL,  AID_SHELL,  "data/local" },
-    { 01771, AID_SYSTEM, AID_MISC,   "data/misc" },
-    { 00770, AID_DHCP,   AID_DHCP,   "data/misc/dhcp" },
-    { 00775, AID_MEDIA_RW, AID_MEDIA_RW, "data/media" },
-    { 00775, AID_MEDIA_RW, AID_MEDIA_RW, "data/media/Music" },
-    { 00771, AID_SYSTEM, AID_SYSTEM, "data" },
-    { 00750, AID_ROOT,   AID_SHELL,  "sbin" },
-    { 00755, AID_ROOT,   AID_SHELL,  "system/bin" },
-    { 00755, AID_ROOT,   AID_SHELL,  "system/vendor" },
-    { 00755, AID_ROOT,   AID_SHELL,  "system/xbin" },
-    { 00755, AID_ROOT,   AID_ROOT,   "system/etc/ppp" },
-    { 00777, AID_ROOT,   AID_ROOT,   "sdcard" },
-    { 00755, AID_ROOT,   AID_ROOT,   0 },
+static const struct fs_path_config android_dirs[] = {
+    { 00770, AID_SYSTEM, AID_CACHE,  0, "cache" },
+    { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/app" },
+    { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/app-private" },
+    { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/dalvik-cache" },
+    { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data/data" },
+    { 00771, AID_SHELL,  AID_SHELL,  0, "data/local/tmp" },
+    { 00771, AID_SHELL,  AID_SHELL,  0, "data/local" },
+    { 01771, AID_SYSTEM, AID_MISC,   0, "data/misc" },
+    { 00770, AID_DHCP,   AID_DHCP,   0, "data/misc/dhcp" },
+    { 00775, AID_MEDIA_RW, AID_MEDIA_RW, 0, "data/media" },
+    { 00775, AID_MEDIA_RW, AID_MEDIA_RW, 0, "data/media/Music" },
+    { 00771, AID_SYSTEM, AID_SYSTEM, 0, "data" },
+    { 00750, AID_ROOT,   AID_SHELL,  0, "sbin" },
+    { 00755, AID_ROOT,   AID_SHELL,  0, "system/bin" },
+    { 00755, AID_ROOT,   AID_SHELL,  0, "system/vendor" },
+    { 00755, AID_ROOT,   AID_SHELL,  0, "system/xbin" },
+    { 00755, AID_ROOT,   AID_ROOT,   0, "system/etc/ppp" },
+    { 00777, AID_ROOT,   AID_ROOT,   0, "sdcard" },
+    { 00755, AID_ROOT,   AID_ROOT,   0, 0 },
 };
 
 /* Rules for files.
@@ -189,53 +192,53 @@ static struct fs_path_config android_dirs[] = {
 ** way up to the root. Prefixes ending in * denotes wildcard
 ** and will allow partial matches.
 */
-static struct fs_path_config android_files[] = {
-    { 00440, AID_ROOT,      AID_SHELL,     "system/etc/init.goldfish.rc" },
-    { 00550, AID_ROOT,      AID_SHELL,     "system/etc/init.goldfish.sh" },
-    { 00440, AID_ROOT,      AID_SHELL,     "system/etc/init.trout.rc" },
-    { 00550, AID_ROOT,      AID_SHELL,     "system/etc/init.ril" },
-    { 00550, AID_ROOT,      AID_SHELL,     "system/etc/init.testmenu" },
-    { 00550, AID_DHCP,      AID_SHELL,     "system/etc/dhcpcd/dhcpcd-run-hooks" },
-    { 00440, AID_BLUETOOTH, AID_BLUETOOTH, "system/etc/dbus.conf" },
-    { 00444, AID_RADIO,     AID_AUDIO,     "system/etc/AudioPara4.csv" },
-    { 00555, AID_ROOT,      AID_ROOT,      "system/etc/ppp/*" },
-    { 00555, AID_ROOT,      AID_ROOT,      "system/etc/rc.*" },
-    { 00644, AID_SYSTEM,    AID_SYSTEM,    "data/app/*" },
-    { 00644, AID_MEDIA_RW,  AID_MEDIA_RW,  "data/media/*" },
-    { 00644, AID_SYSTEM,    AID_SYSTEM,    "data/app-private/*" },
-    { 00644, AID_APP,       AID_APP,       "data/data/*" },
+static const struct fs_path_config android_files[] = {
+    { 00440, AID_ROOT,      AID_SHELL,     0, "system/etc/init.goldfish.rc" },
+    { 00550, AID_ROOT,      AID_SHELL,     0, "system/etc/init.goldfish.sh" },
+    { 00440, AID_ROOT,      AID_SHELL,     0, "system/etc/init.trout.rc" },
+    { 00550, AID_ROOT,      AID_SHELL,     0, "system/etc/init.ril" },
+    { 00550, AID_ROOT,      AID_SHELL,     0, "system/etc/init.testmenu" },
+    { 00550, AID_DHCP,      AID_SHELL,     0, "system/etc/dhcpcd/dhcpcd-run-hooks" },
+    { 00440, AID_BLUETOOTH, AID_BLUETOOTH, 0, "system/etc/dbus.conf" },
+    { 00444, AID_RADIO,     AID_AUDIO,     0, "system/etc/AudioPara4.csv" },
+    { 00555, AID_ROOT,      AID_ROOT,      0, "system/etc/ppp/*" },
+    { 00555, AID_ROOT,      AID_ROOT,      0, "system/etc/rc.*" },
+    { 00644, AID_SYSTEM,    AID_SYSTEM,    0, "data/app/*" },
+    { 00644, AID_MEDIA_RW,  AID_MEDIA_RW,  0, "data/media/*" },
+    { 00644, AID_SYSTEM,    AID_SYSTEM,    0, "data/app-private/*" },
+    { 00644, AID_APP,       AID_APP,       0, "data/data/*" },
         /* the following two files are INTENTIONALLY set-gid and not set-uid.
          * Do not change. */
-    { 02755, AID_ROOT,      AID_NET_RAW,   "system/bin/ping" },
-    { 02750, AID_ROOT,      AID_INET,      "system/bin/netcfg" },
+    { 02755, AID_ROOT,      AID_NET_RAW,   0, "system/bin/ping" },
+    { 02750, AID_ROOT,      AID_INET,      0, "system/bin/netcfg" },
     	/* the following five files are INTENTIONALLY set-uid, but they
 	 * are NOT included on user builds. */
-    { 06755, AID_ROOT,      AID_ROOT,      "system/xbin/su" },
-    { 06755, AID_ROOT,      AID_ROOT,      "system/xbin/librank" },
-    { 06755, AID_ROOT,      AID_ROOT,      "system/xbin/procrank" },
-    { 06755, AID_ROOT,      AID_ROOT,      "system/xbin/procmem" },
-    { 06755, AID_ROOT,      AID_ROOT,      "system/xbin/tcpdump" },
-    { 04770, AID_ROOT,      AID_RADIO,     "system/bin/pppd-ril" },
+    { 06755, AID_ROOT,      AID_ROOT,      0, "system/xbin/su" },
+    { 06755, AID_ROOT,      AID_ROOT,      0, "system/xbin/librank" },
+    { 06755, AID_ROOT,      AID_ROOT,      0, "system/xbin/procrank" },
+    { 06755, AID_ROOT,      AID_ROOT,      0, "system/xbin/procmem" },
+    { 06755, AID_ROOT,      AID_ROOT,      0, "system/xbin/tcpdump" },
+    { 04770, AID_ROOT,      AID_RADIO,     0, "system/bin/pppd-ril" },
 		/* the following file is INTENTIONALLY set-uid, and IS included
 		 * in user builds. */
-    { 06750, AID_ROOT,      AID_SHELL,     "system/bin/run-as" },
-    { 00755, AID_ROOT,      AID_SHELL,     "system/bin/*" },
-    { 00755, AID_ROOT,      AID_ROOT,      "system/lib/valgrind/*" },
-    { 00755, AID_ROOT,      AID_SHELL,     "system/xbin/*" },
-    { 00755, AID_ROOT,      AID_SHELL,     "system/vendor/bin/*" },
-    { 00750, AID_ROOT,      AID_SHELL,     "sbin/*" },
-    { 00755, AID_ROOT,      AID_ROOT,      "bin/*" },
-    { 00750, AID_ROOT,      AID_SHELL,     "init*" },
-    { 00750, AID_ROOT,      AID_SHELL,     "charger*" },
-    { 00750, AID_ROOT,      AID_SHELL,     "sbin/fs_mgr" },
-    { 00640, AID_ROOT,      AID_SHELL,     "fstab.*" },
-    { 00644, AID_ROOT,      AID_ROOT,       0 },
+    { 06750, AID_ROOT,      AID_SHELL,     0, "system/bin/run-as" },
+    { 00755, AID_ROOT,      AID_SHELL,     0, "system/bin/*" },
+    { 00755, AID_ROOT,      AID_ROOT,      0, "system/lib/valgrind/*" },
+    { 00755, AID_ROOT,      AID_SHELL,     0, "system/xbin/*" },
+    { 00755, AID_ROOT,      AID_SHELL,     0, "system/vendor/bin/*" },
+    { 00750, AID_ROOT,      AID_SHELL,     0, "sbin/*" },
+    { 00755, AID_ROOT,      AID_ROOT,      0, "bin/*" },
+    { 00750, AID_ROOT,      AID_SHELL,     0, "init*" },
+    { 00750, AID_ROOT,      AID_SHELL,     0, "charger*" },
+    { 00750, AID_ROOT,      AID_SHELL,     0, "sbin/fs_mgr" },
+    { 00640, AID_ROOT,      AID_SHELL,     0, "fstab.*" },
+    { 00644, AID_ROOT,      AID_ROOT,      0, 0 },
 };
 
 static inline void fs_config(const char *path, int dir,
-                             unsigned *uid, unsigned *gid, unsigned *mode)
+                             unsigned *uid, unsigned *gid, unsigned *mode, uint64_t *capabilities)
 {
-    struct fs_path_config *pc;
+    const struct fs_path_config *pc;
     int plen;
 
     if (path[0] == '/') {
@@ -261,6 +264,7 @@ static inline void fs_config(const char *path, int dir,
     *uid = pc->uid;
     *gid = pc->gid;
     *mode = (*mode & (~07777)) | pc->mode;
+    *capabilities = pc->capabilities;
 
 #if 0
     fprintf(stderr,"< '%s' '%s' %d %d %o >\n",