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platform_system_core
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Allocate a GID range for external cache files. 

We can't reuse the GID range for internal cache files, otherwise
we don't have a way to tease apart the difference when deciding if
it's safe to move apps.

Test: builds, boots
Bug: 37193650
Change-Id: I22c4e575cd557636e74c5c73035adb1d4dcbb7f7
This commit is contained in:
Jeff Sharkey 2017-04-17 14:45:16 -06:00
parent 29ab67b0c1
commit bd2ecd8e6d
4 changed files with 20 additions and 0 deletions
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1
libcutils/include/cutils/multiuser.h
View File

@ -33,6 +33,7 @@ extern uid_t multiuser_get_uid(userid_t user_id, appid_t app_id);
extern gid_t multiuser_get_cache_gid(userid_t user_id, appid_t app_id);
extern gid_t multiuser_get_ext_gid(userid_t user_id, appid_t app_id);
extern gid_t multiuser_get_ext_cache_gid(userid_t user_id, appid_t app_id);
extern gid_t multiuser_get_shared_gid(userid_t user_id, appid_t app_id);
/* TODO: switch callers over to multiuser_get_shared_gid() */

3
libcutils/include/private/android_filesystem_config.h
View File

@ -171,6 +171,9 @@
#define AID_EXT_GID_START 30000 /* start of gids for apps to mark external data */
#define AID_EXT_GID_END 39999 /* end of gids for apps to mark external data */
#define AID_EXT_CACHE_GID_START 40000 /* start of gids for apps to mark external cached data */
#define AID_EXT_CACHE_GID_END 49999 /* end of gids for apps to mark external cached data */
#define AID_SHARED_GID_START 50000 /* start of gids for apps in each user to share */
#define AID_SHARED_GID_END 59999 /* end of gids for apps in each user to share */

8
libcutils/multiuser.c
View File

@ -45,6 +45,14 @@ gid_t multiuser_get_ext_gid(userid_t user_id, appid_t app_id) {
}
}
gid_t multiuser_get_ext_cache_gid(userid_t user_id, appid_t app_id) {
if (app_id >= AID_APP_START && app_id <= AID_APP_END) {
return multiuser_get_uid(user_id, (app_id - AID_APP_START) + AID_EXT_CACHE_GID_START);
} else {
return -1;
}
}
gid_t multiuser_get_shared_gid(userid_t user_id, appid_t app_id) {
if (app_id >= AID_APP_START && app_id <= AID_APP_END) {
return multiuser_get_uid(user_id, (app_id - AID_APP_START) + AID_SHARED_GID_START);

8
libcutils/tests/multiuser_test.cpp
View File

@ -68,6 +68,14 @@ TEST(MultiuserTest, TestExt) {
EXPECT_EQ(1030000U, multiuser_get_ext_gid(10, 10000));
}
TEST(MultiuserTest, TestExtCache) {
EXPECT_EQ(ERR_GID, multiuser_get_ext_cache_gid(0, 0));
EXPECT_EQ(ERR_GID, multiuser_get_ext_cache_gid(0, 1000));
EXPECT_EQ(40000U, multiuser_get_ext_cache_gid(0, 10000));
EXPECT_EQ(ERR_GID, multiuser_get_ext_cache_gid(0, 50000));
EXPECT_EQ(1040000U, multiuser_get_ext_cache_gid(10, 10000));
}
TEST(MultiuserTest, TestShared) {
EXPECT_EQ(ERR_GID, multiuser_get_shared_gid(0, 0));
EXPECT_EQ(ERR_GID, multiuser_get_shared_gid(0, 1000));