// https://syzkaller.appspot.com/bug?id=7b4bb10c9ddf012c9d246e0a29b55dc2917669a4 // 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 #ifndef __NR_ioctl #define __NR_ioctl 29 #endif #ifndef __NR_mmap #define __NR_mmap 222 #endif 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); for (int 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 = 0; for (;; 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 (;;) { sleep_ms(10); if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; if (current_time_ms() - start < 5000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[7] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff, 0x0, 0x0, 0x0, 0x0}; void execute_one(void) { intptr_t res = 0; if (write(1, "executing program\n", sizeof("executing program\n") - 1)) { } memcpy((void*)0x20000080, "/dev/dri/card#\000", 15); res = -1; res = syz_open_dev(/*dev=*/0x20000080, /*id=*/1, /*flags=*/0); if (res != -1) r[0] = res; memcpy((void*)0x200000c0, "/dev/dri/card#\000", 15); res = -1; res = syz_open_dev(/*dev=*/0x200000c0, /*id=*/0x1ff, /*flags=*/0); if (res != -1) r[1] = res; memcpy((void*)0x20000080, "/dev/dri/card#\000", 15); res = -1; res = syz_open_dev(/*dev=*/0x20000080, /*id=*/1, /*flags=*/0); if (res != -1) r[2] = res; *(uint64_t*)0x20000540 = 0; *(uint64_t*)0x20000548 = 0; *(uint64_t*)0x20000550 = 0x200004c0; *(uint64_t*)0x20000558 = 0; *(uint32_t*)0x20000560 = 0; *(uint32_t*)0x20000564 = 0; *(uint32_t*)0x20000568 = 1; *(uint32_t*)0x2000056c = 0; *(uint32_t*)0x20000570 = 0; *(uint32_t*)0x20000574 = 0; *(uint32_t*)0x20000578 = 0; *(uint32_t*)0x2000057c = 0; res = syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0xc04064a0, /*arg=*/0x20000540ul); if (res != -1) r[3] = *(uint32_t*)0x200004c0; *(uint64_t*)0x20000000 = 3; *(uint64_t*)0x20000008 = 2; syscall(__NR_ioctl, /*fd=*/r[2], /*cmd=*/0x4010640d, /*arg=*/0x20000000ul); *(uint64_t*)0x20000140 = 0x20000100; *(uint32_t*)0x20000148 = 1; res = syscall(__NR_ioctl, /*fd=*/r[2], /*cmd=*/0xc01064b5, /*arg=*/0x20000140ul); if (res != -1) r[4] = *(uint32_t*)0x20000100; *(uint32_t*)0x200001c0 = r[4]; *(uint32_t*)0x200001c4 = 0; *(uint32_t*)0x200001c8 = 0; *(uint32_t*)0x200001cc = 0; *(uint32_t*)0x200001d0 = 0; *(uint32_t*)0x200001d4 = 0; *(uint64_t*)0x200001d8 = 0; res = syscall(__NR_ioctl, /*fd=*/r[2], /*cmd=*/0xc02064b6, /*arg=*/0x200001c0ul); if (res != -1) r[5] = *(uint32_t*)0x200001c8; *(uint32_t*)0x20000200 = r[4]; *(uint32_t*)0x20000204 = 0; *(uint32_t*)0x20000208 = 0; *(uint32_t*)0x2000020c = 0; *(uint32_t*)0x20000210 = 0; *(uint32_t*)0x20000214 = 0; *(uint64_t*)0x20000218 = 0; res = syscall(__NR_ioctl, /*fd=*/r[1], /*cmd=*/0xc02064b6, /*arg=*/0x20000200ul); if (res != -1) r[6] = *(uint32_t*)0x20000204; *(uint64_t*)0x20000400 = 0x20000480; *(uint32_t*)0x20000480 = r[3]; *(uint32_t*)0x20000408 = 1; *(uint32_t*)0x2000040c = r[6]; *(uint32_t*)0x20000410 = r[5]; *(uint32_t*)0x20000414 = 0; *(uint32_t*)0x20000418 = 0; *(uint32_t*)0x2000041c = 0; *(uint32_t*)0x20000420 = 8; *(uint32_t*)0x20000424 = 4; *(uint16_t*)0x20000428 = 1; *(uint16_t*)0x2000042a = 3; *(uint16_t*)0x2000042c = 0x69; *(uint16_t*)0x2000042e = 0x200; *(uint16_t*)0x20000430 = 0; *(uint16_t*)0x20000432 = 1; *(uint16_t*)0x20000434 = 5; *(uint16_t*)0x20000436 = 0x4dab; *(uint16_t*)0x20000438 = 0x8000; *(uint16_t*)0x2000043a = 0x300; *(uint32_t*)0x2000043c = 0; *(uint32_t*)0x20000440 = 0x237; *(uint32_t*)0x20000444 = 0; memcpy((void*)0x20000448, "\xfe\x1d\x0e\x22\x3e\xde\x04\xa6\xa7\x70\xf5\xdb\xe6\x0b\x0b\xd1\x7b" "\x48\x12\x40\xff\x8e\xb8\x39\x77\x36\xec\x02\x68\x20\x8f\x7d", 32); syscall(__NR_ioctl, /*fd=*/r[0], /*cmd=*/0xc06864a2, /*arg=*/0x20000400ul); } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=PROT_WRITE|PROT_READ|PROT_EXEC*/ 7ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=MAP_FIXED|MAP_ANONYMOUS|MAP_PRIVATE*/ 0x32ul, /*fd=*/-1, /*offset=*/0ul); const char* reason; (void)reason; for (procid = 0; procid < 5; procid++) { if (fork() == 0) { loop(); } } sleep(1000000); return 0; }