// https://syzkaller.appspot.com/bug?id=d2a4c274c88159193d771cfdfd67bd7ca71b3868 // autogenerated by syzkaller (http://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include __attribute__((noreturn)) static void doexit(int status) { volatile unsigned i; syscall(__NR_exit_group, status); for (i = 0;; i++) { } } #include #include const int kFailStatus = 67; const int kRetryStatus = 69; static void fail(const char* msg, ...) { int e = errno; va_list args; va_start(args, msg); vfprintf(stderr, msg, args); va_end(args); fprintf(stderr, " (errno %d)\n", e); doexit((e == ENOMEM || e == EAGAIN) ? kRetryStatus : kFailStatus); } static uint64_t current_time_ms() { struct timespec ts; if (clock_gettime(CLOCK_MONOTONIC, &ts)) fail("clock_gettime failed"); return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; } static uintptr_t syz_open_dev(uintptr_t a0, uintptr_t a1, uintptr_t a2) { if (a0 == 0xc || a0 == 0xb) { char buf[128]; sprintf(buf, "/dev/%s/%d:%d", a0 == 0xc ? "char" : "block", (uint8_t)a1, (uint8_t)a2); return open(buf, O_RDWR, 0); } else { char buf[1024]; char* hash; strncpy(buf, (char*)a0, sizeof(buf)); buf[sizeof(buf) - 1] = 0; while ((hash = strchr(buf, '#'))) { *hash = '0' + (char)(a1 % 10); a1 /= 10; } return open(buf, a2, 0); } } static void test(); void loop() { int iter; for (iter = 0;; iter++) { int pid = fork(); if (pid < 0) fail("loop fork failed"); if (pid == 0) { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); test(); doexit(0); } int status = 0; uint64_t start = current_time_ms(); for (;;) { int res = waitpid(-1, &status, __WALL | WNOHANG); if (res == pid) break; usleep(1000); if (current_time_ms() - start > 5 * 1000) { kill(-pid, SIGKILL); kill(pid, SIGKILL); while (waitpid(-1, &status, __WALL) != pid) { } break; } } } } #ifndef __NR_mmap #define __NR_mmap 192 #endif #ifndef __NR_ioctl #define __NR_ioctl 54 #endif #undef __NR_mmap #define __NR_mmap __NR_mmap2 long r[1]; void test() { memset(r, -1, sizeof(r)); syscall(__NR_mmap, 0x20000000, 0xfff000, 3, 0x32, -1, 0); memcpy((void*)0x206beff3, "/dev/binder#", 13); r[0] = syz_open_dev(0x206beff3, 0, 0x80000); *(uint64_t*)0x20008000 = 0x44; *(uint64_t*)0x20008008 = 0; *(uint64_t*)0x20008010 = 0x20004fbc; *(uint64_t*)0x20008018 = 0; *(uint64_t*)0x20008020 = 0; *(uint64_t*)0x20008028 = 0x20009000; *(uint32_t*)0x20004fbc = 0x40406300; *(uint32_t*)0x20004fc0 = 0; *(uint32_t*)0x20004fc4 = 0; *(uint64_t*)0x20004fc8 = 0; *(uint32_t*)0x20004fd0 = 0; *(uint32_t*)0x20004fd4 = 0; *(uint32_t*)0x20004fd8 = 0; *(uint32_t*)0x20004fdc = 0; *(uint64_t*)0x20004fe0 = 0x294; *(uint64_t*)0x20004fe8 = 0; *(uint64_t*)0x20004ff0 = 0x2026c000; *(uint64_t*)0x20004ff8 = 0x2000afd0; syscall(__NR_ioctl, r[0], 0xc0306201, 0x20008000); } int main() { for (;;) { loop(); } }