// https://syzkaller.appspot.com/bug?id=f82ab89451323208e343f4a8632014ef12b1252d // autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static unsigned long long procid; static void sleep_ms(uint64_t ms) { usleep(ms * 1000); } static uint64_t current_time_ms(void) { struct timespec ts; if (clock_gettime(CLOCK_MONOTONIC, &ts)) exit(1); return (uint64_t)ts.tv_sec * 1000 + (uint64_t)ts.tv_nsec / 1000000; } static bool write_file(const char* file, const char* what, ...) { char buf[1024]; va_list args; va_start(args, what); vsnprintf(buf, sizeof(buf), what, args); va_end(args); buf[sizeof(buf) - 1] = 0; int len = strlen(buf); int fd = open(file, O_WRONLY | O_CLOEXEC); if (fd == -1) return false; if (write(fd, buf, len) != len) { int err = errno; close(fd); errno = err; return false; } close(fd); return true; } static long syz_open_dev(volatile long a0, volatile long a1, volatile long 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) - 1); buf[sizeof(buf) - 1] = 0; while ((hash = strchr(buf, '#'))) { *hash = '0' + (char)(a1 % 10); a1 /= 10; } return open(buf, a2, 0); } } static void kill_and_wait(int pid, int* status) { kill(-pid, SIGKILL); kill(pid, SIGKILL); int i; for (i = 0; i < 100; i++) { if (waitpid(-1, status, WNOHANG | __WALL) == pid) return; usleep(1000); } DIR* dir = opendir("/sys/fs/fuse/connections"); if (dir) { for (;;) { struct dirent* ent = readdir(dir); if (!ent) break; if (strcmp(ent->d_name, ".") == 0 || strcmp(ent->d_name, "..") == 0) continue; char abort[300]; snprintf(abort, sizeof(abort), "/sys/fs/fuse/connections/%s/abort", ent->d_name); int fd = open(abort, O_WRONLY); if (fd == -1) { continue; } if (write(fd, abort, 1) < 0) { } close(fd); } closedir(dir); } else { } while (waitpid(-1, status, __WALL) != pid) { } } static void setup_test() { prctl(PR_SET_PDEATHSIG, SIGKILL, 0, 0, 0); setpgrp(); write_file("/proc/self/oom_score_adj", "1000"); } static void execute_one(void); #define WAIT_FLAGS __WALL static void loop(void) { int iter; for (iter = 0;; iter++) { int pid = fork(); if (pid < 0) exit(1); if (pid == 0) { setup_test(); execute_one(); exit(0); } int status = 0; uint64_t start = current_time_ms(); for (;;) { if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; sleep_ms(1); if (current_time_ms() - start < 5 * 1000) continue; kill_and_wait(pid, &status); break; } } } #ifndef __NR_ioctl #define __NR_ioctl 54 #endif #ifndef __NR_mmap #define __NR_mmap 192 #endif #ifndef __NR_mount #define __NR_mount 21 #endif #ifndef __NR_openat #define __NR_openat 295 #endif #ifndef __NR_write #define __NR_write 4 #endif #undef __NR_mmap #define __NR_mmap __NR_mmap2 uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; memcpy((void*)0x20000240, "xfs\000", 4); syscall(__NR_mount, 0, 0, 0x20000240, 0, 0); res = syz_open_dev(0xc, 4, 0x14 + procid * 2); if (res != -1) r[0] = res; *(uint8_t*)0x200001c0 = 0x1b; *(uint8_t*)0x200001c1 = 0x5d; *(uint8_t*)0x200001c2 = 0x50; *(uint8_t*)0x200001c3 = 0x9b; *(uint8_t*)0x200001c4 = 0; *(uint8_t*)0x200001c5 = 0; *(uint8_t*)0x200001c6 = 0; *(uint8_t*)0x200001c7 = 0; *(uint64_t*)0x200001c8 = 0x3f00; *(uint16_t*)0x200001d0 = 0; *(uint16_t*)0x200001d2 = 0; *(uint32_t*)0x200001d4 = 0; *(uint64_t*)0x200001d8 = 0; *(uint64_t*)0x200001e0 = 7; *(uint64_t*)0x200001e8 = 0; *(uint32_t*)0x200001f0 = 0; *(uint16_t*)0x200001f4 = 0; *(uint16_t*)0x200001f6 = 0x38; *(uint16_t*)0x200001f8 = 0x63; *(uint16_t*)0x200001fa = 0; *(uint16_t*)0x200001fc = 0; *(uint16_t*)0x200001fe = 0; *(uint32_t*)0x20000200 = 0; *(uint32_t*)0x20000204 = 0; *(uint64_t*)0x20000208 = 0; *(uint64_t*)0x20000210 = 0; *(uint64_t*)0x20000218 = 0; *(uint64_t*)0x20000220 = 0; *(uint64_t*)0x20000228 = 0; *(uint64_t*)0x20000230 = 0; syscall(__NR_write, (intptr_t)r[0], 0x200001c0, 0x320); memcpy((void*)0x20000180, "/dev/fb0\000", 9); res = syscall(__NR_openat, 0xffffff9c, 0x20000180, 0, 0); if (res != -1) r[1] = res; *(uint32_t*)0x20000000 = 0x320; *(uint32_t*)0x20000004 = 0; *(uint32_t*)0x20000008 = 0xc80; *(uint32_t*)0x2000000c = 0; *(uint32_t*)0x20000010 = 0; *(uint32_t*)0x20000014 = 2; *(uint32_t*)0x20000018 = 4; *(uint32_t*)0x2000001c = 0; *(uint32_t*)0x20000020 = 0x30; *(uint32_t*)0x20000024 = 0xfffffffc; *(uint32_t*)0x20000028 = 0; *(uint32_t*)0x2000002c = 5; *(uint32_t*)0x20000030 = 1; *(uint32_t*)0x20000034 = 0xfffffffd; *(uint32_t*)0x20000038 = 0x7f; *(uint32_t*)0x2000003c = 0; *(uint32_t*)0x20000040 = 0; *(uint32_t*)0x20000044 = 0; *(uint32_t*)0x20000048 = 0xfffffffc; *(uint32_t*)0x2000004c = 0; *(uint32_t*)0x20000050 = 5; *(uint32_t*)0x20000054 = 0x40; *(uint32_t*)0x20000058 = 0; *(uint32_t*)0x2000005c = 0x2000000; *(uint32_t*)0x20000060 = 0; *(uint32_t*)0x20000064 = 3; *(uint32_t*)0x20000068 = 0; *(uint32_t*)0x2000006c = 0; *(uint32_t*)0x20000070 = 0; *(uint32_t*)0x20000074 = 0; *(uint32_t*)0x20000078 = 0; *(uint32_t*)0x2000007c = 3; *(uint32_t*)0x20000080 = 0x20; *(uint32_t*)0x20000084 = 2; *(uint32_t*)0x20000088 = 0; *(uint32_t*)0x2000008c = 0; *(uint32_t*)0x20000090 = 0; *(uint32_t*)0x20000094 = 0; *(uint32_t*)0x20000098 = 0; *(uint32_t*)0x2000009c = 0; syscall(__NR_ioctl, (intptr_t)r[1], 0x4601, 0x20000000); } int main(void) { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); for (procid = 0; procid < 6; procid++) { if (fork() == 0) { loop(); } } sleep(1000000); return 0; }