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#include <stdio.h> | |
#include <stdlib.h> | |
#include <dirent.h> | |
#include <sys/types.h> | |
#include <regex.h> | |
#include <string.h> | |
#include <sys/ptrace.h> | |
#include <time.h> | |
#include <unistd.h> | |
// gcc -pthread -o ptrace_roulette ptrace_roulette.c | |
const int THREAD_MAX = 8; | |
const char* get_process_name_by_pid(const int pid) { | |
char* name = (char*)calloc(1024,sizeof(char)); | |
if (name) { | |
sprintf(name, "/proc/%d/cmdline",pid); | |
FILE* f = fopen(name,"r"); | |
if (f) { | |
size_t size; | |
size = fread(name, sizeof(char), 1024, f); | |
if (size > 0) { | |
if ('\n'==name[size-1]) | |
name[size-1]='\0'; | |
} | |
fclose(f); | |
} | |
} | |
return name; | |
} | |
int *get_proc_ids() { | |
int *pid_list = (int*)malloc(sizeof(int) * 2); | |
pid_list[0] = 1; | |
regex_t preg; | |
regcomp(&preg, "^[0-9]+$", REG_EXTENDED); | |
struct dirent *dir; | |
DIR *d = opendir("/proc"); | |
while ((dir = readdir(d)) != NULL) { | |
if (!regexec(&preg, dir->d_name, 0, NULL, 0)) { | |
pid_list[pid_list[0]] = atoi(dir->d_name); | |
pid_list[0]++; | |
pid_list = (int*)realloc(pid_list, (pid_list[0] + 1) * sizeof(int)); | |
} | |
} | |
closedir(d); | |
return pid_list; | |
} | |
void *roulette() { | |
int *pid_list, pid, my_pid = getpid(); | |
void *address = 0x0000000; | |
pid_list = get_proc_ids(); | |
srand(time(NULL)); | |
FILE *urandom = fopen("/dev/urandom", "rb"); | |
int gen; | |
const char* env_skip_proc = getenv("SPROC"); | |
const char* env_css_proc = getenv("CPROC"); | |
for(;;) { | |
fscanf(urandom, "%d", gen); | |
pid = pid_list[gen % pid_list[0] + 1]; | |
if (pid == my_pid) | |
continue; | |
const char* name = get_process_name_by_pid(pid); | |
if (strcmp(name, env_skip_proc) == 0) { | |
continue; | |
} | |
if (strcmp(name, env_css_proc) == 0) { | |
continue; | |
} | |
ptrace(PTRACE_ATTACH, pid, NULL, NULL); | |
fscanf(urandom, "%ld", address); | |
ptrace(PTRACE_POKEDATA, pid, address, ~ptrace(PTRACE_PEEKDATA, pid, address, NULL)); | |
ptrace(PTRACE_DETACH, pid, NULL, NULL); | |
} | |
} | |
int main() { | |
pthread_t thread_id; | |
for (int index = 0; index < THREAD_MAX; ++index) { | |
pthread_create(&thread_id, NULL, roulette, NULL); | |
} | |
pthread_join(thread_id, NULL); | |
return 0; | |
} |
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