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kernel: Fix side channel attack

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This commit is contained in:
tiann
2023-03-28 12:07:18 +08:00
parent 8c222add7c
commit 814d65cc28
1 changed files with 28 additions and 2 deletions
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30
kernel/core_hook.c
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@@ -35,6 +35,16 @@ static inline bool is_allow_su()
return ksu_is_allow_uid(current_uid().val);
}
static inline bool is_isolated_uid(uid_t uid) {
#define FIRST_ISOLATED_UID 99000
#define LAST_ISOLATED_UID 99999
#define FIRST_APP_ZYGOTE_ISOLATED_UID 90000
#define LAST_APP_ZYGOTE_ISOLATED_UID 98999
uid_t appid = uid % 100000;
return (appid >= FIRST_ISOLATED_UID && appid <= LAST_ISOLATED_UID)
|| (appid >= FIRST_APP_ZYGOTE_ISOLATED_UID && appid <= LAST_APP_ZYGOTE_ISOLATED_UID);
}
static struct group_info root_groups = { .usage = ATOMIC_INIT(2) };
void escape_to_root(void)
@@ -124,7 +134,17 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
return 0;
}
pr_info("option: 0x%x, cmd: %ld\n", option, arg2);
// always ignore isolated app uid
if (is_isolated_uid(current_uid().val)) {
return 0;
}
static uid_t last_failed_uid = -1;
if (last_failed_uid == current_uid().val) {
return 0;
}
// pr_info("option: 0x%x, cmd: %ld\n", option, arg2);
if (arg2 == CMD_BECOME_MANAGER) {
// quick check
@@ -234,6 +254,9 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
}
if (arg2 == CMD_SET_SEPOLICY) {
if (0 != current_uid().val) {
return 0;
}
if (!handle_sepolicy(arg3, arg4)) {
if (copy_to_user(result, &reply_ok, sizeof(reply_ok))) {
pr_err("sepolicy: prctl reply error\n");
@@ -244,6 +267,9 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
}
if (arg2 == CMD_CHECK_SAFEMODE) {
if (!is_manager() && 0 != current_uid().val) {
return 0;
}
if (ksu_is_safe_mode()) {
pr_warn("safemode enabled!\n");
if (copy_to_user(result, &reply_ok, sizeof(reply_ok))) {
@@ -280,7 +306,7 @@ int ksu_handle_prctl(int option, unsigned long arg2, unsigned long arg3,
// all other cmds are for 'root manager'
if (!is_manager()) {
pr_info("Only manager can do cmd: %d\n", arg2);
last_failed_uid = current_uid().val;
return 0;
}