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kernel: add su compat mode

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This commit is contained in:
weishu
2022-12-14 14:55:29 +07:00
parent 280660125f
commit e9ed28077f
4 changed files with 149 additions and 7 deletions
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17
kernel/ksu.c
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@@ -38,7 +38,7 @@
#define CMD_GET_ALLOW_LIST 5
#define CMD_GET_DENY_LIST 6
static void escape_to_root(void) {
void escape_to_root(bool disable_seccomp) {
struct cred* cred;
cred = (struct cred *)__task_cred(current);
@@ -56,10 +56,11 @@ static void escape_to_root(void) {
memset(&cred->cap_bset, 0xff, sizeof(cred->cap_bset));
memset(&cred->cap_ambient, 0xff, sizeof(cred->cap_ambient));
// DISABLE SECCOMP
current_thread_info()->flags = 0;
current->seccomp.mode = 0;
current->seccomp.filter = NULL;
if (disable_seccomp) {
current_thread_info()->flags = 0;
current->seccomp.mode = 0;
current->seccomp.filter = NULL;
}
setup_selinux();
}
@@ -148,6 +149,8 @@ static bool is_allow_su() {
return ksu_is_allow_uid(uid);
}
extern void enable_sucompat();
static int handler_pre(struct kprobe *p, struct pt_regs *regs) {
struct pt_regs* real_regs = (struct pt_regs*) PT_REGS_PARM1(regs);
@@ -179,7 +182,7 @@ static int handler_pre(struct kprobe *p, struct pt_regs *regs) {
if (arg2 == CMD_GRANT_ROOT) {
if (is_allow_su()) {
pr_info("allow root for: %d\n", current_uid());
escape_to_root();
escape_to_root(true);
} else {
pr_info("deny root for: %d\n", current_uid());
// add it to deny list!
@@ -233,6 +236,8 @@ int kernelsu_init(void){
rc = register_kprobe(&kp);
enable_sucompat();
return rc;
}