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kernel: add uid observer, correctly prune uid allowlist when app is installed/uninstalled.

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weishu
2023-01-17 12:44:22 +07:00
parent 2ab60750d4
commit ab36e1fa0c
7 changed files with 256 additions and 10 deletions
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16
kernel/ksu.c
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@@ -27,6 +27,7 @@
#include "apk_sign.h"
#include "allowlist.h"
#include "arch.h"
#include "uid_observer.h"
#define KERNEL_SU_VERSION 9
@@ -43,6 +44,8 @@
static struct group_info root_groups = { .usage = ATOMIC_INIT(2) };
uid_t ksu_manager_uid;
void escape_to_root()
{
struct cred *cred;
@@ -91,11 +94,10 @@ int endswith(const char *s, const char *t)
return strcmp(s + slen - tlen, t);
}
static uid_t __manager_uid;
static bool is_manager()
{
return __manager_uid == current_uid().val;
return ksu_manager_uid == current_uid().val;
}
static bool become_manager(char *pkg)
@@ -113,8 +115,8 @@ static bool become_manager(char *pkg)
return false;
}
if (__manager_uid != 0) {
pr_info("manager already exist: %d\n", __manager_uid);
if (ksu_manager_uid != 0) {
pr_info("manager already exist: %d\n", ksu_manager_uid);
return is_manager();
}
@@ -148,7 +150,7 @@ static bool become_manager(char *pkg)
uid_t uid = current_uid().val;
pr_info("manager uid: %d\n", uid);
__manager_uid = uid;
ksu_manager_uid = uid;
result = true;
goto clean;
@@ -169,7 +171,7 @@ clean:
static bool is_allow_su()
{
uid_t uid = current_uid().val;
if (uid == __manager_uid) {
if (uid == ksu_manager_uid) {
// we are manager, allow!
return true;
}
@@ -332,6 +334,8 @@ int kernelsu_init(void)
return rc;
}
ksu_uid_observer_init();
enable_sucompat();
return 0;