forked from MarcoBuster/Magisk
134 lines
3.0 KiB
C
134 lines
3.0 KiB
C
/* proc_monitor.c - Monitor am_proc_start events
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*
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* We monitor the logcat am_proc_start events, pause it,
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* and send the target PID to hide daemon ASAP
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <signal.h>
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#include <pthread.h>
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#include <sys/types.h>
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#include "magisk.h"
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#include "utils.h"
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#include "magiskhide.h"
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/* WTF... the macro in the NDK pthread.h is broken.... */
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#define pthread_cleanup_push_fix(routine, arg) \
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pthread_cleanup_push(routine, arg) } while(0);
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static void read_namespace(const int pid, char* target, const size_t size) {
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char path[32];
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snprintf(path, sizeof(path), "/proc/%d/ns/mnt", pid);
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ssize_t len = readlink(path, target, size);
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target[len] = '\0';
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}
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// Workaround for the lack of pthread_cancel
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static void quit_pthread(int sig) {
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pthread_exit(NULL);
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}
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static void cleanup_handler(void *arg) {
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vec_deep_destroy(hide_list);
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vec_deep_destroy(new_list);
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free(hide_list);
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free(new_list);
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hide_list = new_list = NULL;
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}
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void *proc_monitor(void *args) {
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// Register the cancel signal
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signal(SIGUSR1, quit_pthread);
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pthread_cleanup_push_fix(cleanup_handler, NULL);
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int pid, zygote_num = 0;
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char init_ns[32], zygote_ns[2][32], buffer[512];
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FILE *p;
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// Get the mount namespace of init
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read_namespace(1, init_ns, 32);
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LOGI("proc_monitor: init ns=%s\n", init_ns);
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// Get the mount namespace of zygote
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// TODO: Crawl through /proc to get process names
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switch(zygote_num) {
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case 1:
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LOGI("proc_monitor: zygote ns=%s\n", zygote_ns[0]);
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break;
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case 2:
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LOGI("proc_monitor: zygote (1) ns=%s (2) ns=%s\n", zygote_ns[0], zygote_ns[1]);
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break;
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}
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// Monitor am_proc_start (the command shall never end)
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p = popen("while true; do logcat -b events -c; logcat -b events -v raw -s am_proc_start; sleep 1; done", "r");
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while(fgets(buffer, sizeof(buffer), p)) {
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int ret, comma = 0;
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char *pos = buffer, *line, processName[256];
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struct vector *temp = NULL;
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while(1) {
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pos = strchr(pos, ',');
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if(pos == NULL)
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break;
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pos[0] = ' ';
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++comma;
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}
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if (comma == 6)
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ret = sscanf(buffer, "[%*d %d %*d %*d %256s", &pid, processName);
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else
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ret = sscanf(buffer, "[%*d %d %*d %256s", &pid, processName);
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if(ret != 2)
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continue;
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// Should be thread safe
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if (hide_list != new_list) {
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temp = hide_list;
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hide_list = new_list;
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}
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vec_for_each(hide_list, line) {
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if (strcmp(processName, line) == 0) {
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read_namespace(pid, buffer, 32);
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while(1) {
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ret = 1;
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for (int i = 0; i < zygote_num; ++i) {
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if (strcmp(buffer, zygote_ns[i]) == 0) {
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usleep(500);
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ret = 0;
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break;
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}
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}
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if (ret) break;
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}
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// Send pause signal ASAP
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if (kill(pid, SIGSTOP) == -1) continue;
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LOGI("proc_monitor: %s(PID=%d ns=%s)\n", processName, pid, buffer);
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// Unmount start
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xwrite(pipefd[1], &pid, sizeof(pid));
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break;
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}
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}
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if (temp) {
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vec_deep_destroy(temp);
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free(temp);
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}
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}
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// Should never be here
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pclose(p);
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quit_pthread(SIGUSR1);
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return NULL;
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}
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