// https://syzkaller.appspot.com/bug?id=6eaaa45d7e9b92bfb4d464b639cb6045a54e83b8 // autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include <dirent.h> #include <endian.h> #include <errno.h> #include <fcntl.h> #include <signal.h> #include <stdarg.h> #include <stdbool.h> #include <stdint.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/prctl.h> #include <sys/stat.h> #include <sys/syscall.h> #include <sys/types.h> #include <sys/wait.h> #include <time.h> #include <unistd.h> #ifndef __NR_bpf #define __NR_bpf 321 #endif 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; } #define BITMASK(bf_off, bf_len) (((1ull << (bf_len)) - 1) << (bf_off)) #define STORE_BY_BITMASK(type, htobe, addr, val, bf_off, bf_len) \ *(type*)(addr) = \ htobe((htobe(*(type*)(addr)) & ~BITMASK((bf_off), (bf_len))) | \ (((type)(val) << (bf_off)) & BITMASK((bf_off), (bf_len)))) 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 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 (;;) { if (waitpid(-1, &status, WNOHANG | WAIT_FLAGS) == pid) break; sleep_ms(1); if (current_time_ms() - start < 5000) continue; kill_and_wait(pid, &status); break; } } } uint64_t r[2] = {0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; *(uint32_t*)0x200009c0 = 0xf; *(uint32_t*)0x200009c4 = 4; *(uint32_t*)0x200009c8 = 4; *(uint32_t*)0x200009cc = 4; *(uint32_t*)0x200009d0 = 0; *(uint32_t*)0x200009d4 = -1; *(uint32_t*)0x200009d8 = 0; memset((void*)0x200009dc, 0, 16); *(uint32_t*)0x200009ec = 0; *(uint32_t*)0x200009f0 = -1; *(uint32_t*)0x200009f4 = 0; *(uint32_t*)0x200009f8 = 0; *(uint32_t*)0x200009fc = 0; *(uint64_t*)0x20000a00 = 0; res = syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x200009c0ul, /*size=*/0x48ul); if (res != -1) r[0] = res; *(uint32_t*)0x200002c0 = 0x11; *(uint32_t*)0x200002c4 = 0xc; *(uint64_t*)0x200002c8 = 0x20000440; *(uint8_t*)0x20000440 = 0x18; STORE_BY_BITMASK(uint8_t, , 0x20000441, 0, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000441, 0, 4, 4); *(uint16_t*)0x20000442 = 0; *(uint32_t*)0x20000444 = 0; *(uint8_t*)0x20000448 = 0; *(uint8_t*)0x20000449 = 0; *(uint16_t*)0x2000044a = 0; *(uint32_t*)0x2000044c = 0; *(uint8_t*)0x20000450 = 0x18; STORE_BY_BITMASK(uint8_t, , 0x20000451, 1, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000451, 1, 4, 4); *(uint16_t*)0x20000452 = 0; *(uint32_t*)0x20000454 = r[0]; *(uint8_t*)0x20000458 = 0; *(uint8_t*)0x20000459 = 0; *(uint16_t*)0x2000045a = 0; *(uint32_t*)0x2000045c = 0; STORE_BY_BITMASK(uint8_t, , 0x20000460, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000460, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x20000460, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x20000461, 8, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000461, 0, 4, 4); *(uint16_t*)0x20000462 = 0; *(uint32_t*)0x20000464 = 0; STORE_BY_BITMASK(uint8_t, , 0x20000468, 3, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000468, 3, 3, 2); STORE_BY_BITMASK(uint8_t, , 0x20000468, 3, 5, 3); STORE_BY_BITMASK(uint8_t, , 0x20000469, 0xa, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000469, 8, 4, 4); *(uint16_t*)0x2000046a = 0xfff8; *(uint32_t*)0x2000046c = 0; STORE_BY_BITMASK(uint8_t, , 0x20000470, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000470, 1, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x20000470, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x20000471, 2, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000471, 0xa, 4, 4); *(uint16_t*)0x20000472 = 0; *(uint32_t*)0x20000474 = 0; STORE_BY_BITMASK(uint8_t, , 0x20000478, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000478, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x20000478, 0, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x20000479, 2, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000479, 0, 4, 4); *(uint16_t*)0x2000047a = 0; *(uint32_t*)0x2000047c = 0xfffffff8; STORE_BY_BITMASK(uint8_t, , 0x20000480, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000480, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x20000480, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x20000481, 3, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000481, 0, 4, 4); *(uint16_t*)0x20000482 = 0; *(uint32_t*)0x20000484 = 8; STORE_BY_BITMASK(uint8_t, , 0x20000488, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x20000488, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x20000488, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x20000489, 4, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000489, 0, 4, 4); *(uint16_t*)0x2000048a = 0; *(uint32_t*)0x2000048c = 0; *(uint8_t*)0x20000490 = 0x85; *(uint8_t*)0x20000491 = 0; *(uint16_t*)0x20000492 = 0; *(uint32_t*)0x20000494 = 3; *(uint8_t*)0x20000498 = 0x95; *(uint8_t*)0x20000499 = 0; *(uint16_t*)0x2000049a = 0; *(uint32_t*)0x2000049c = 0; *(uint64_t*)0x200002d0 = 0; *(uint32_t*)0x200002d8 = 0; *(uint32_t*)0x200002dc = 0; *(uint64_t*)0x200002e0 = 0; *(uint32_t*)0x200002e8 = 0; *(uint32_t*)0x200002ec = 0; memset((void*)0x200002f0, 0, 16); *(uint32_t*)0x20000300 = 0; *(uint32_t*)0x20000304 = 0; *(uint32_t*)0x20000308 = -1; *(uint32_t*)0x2000030c = 0; *(uint64_t*)0x20000310 = 0; *(uint32_t*)0x20000318 = 0; *(uint32_t*)0x2000031c = 0; *(uint64_t*)0x20000320 = 0; *(uint32_t*)0x20000328 = 0; *(uint32_t*)0x2000032c = 0; *(uint32_t*)0x20000330 = 0; *(uint32_t*)0x20000334 = 0; *(uint64_t*)0x20000338 = 0; *(uint64_t*)0x20000340 = 0; *(uint32_t*)0x20000348 = 0; *(uint32_t*)0x2000034c = 0; syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200002c0ul, /*size=*/0x90ul); *(uint32_t*)0x200000c0 = 0x11; *(uint32_t*)0x200000c4 = 0xc; *(uint64_t*)0x200000c8 = 0x20000440; *(uint64_t*)0x200000d0 = 0x20000240; memcpy((void*)0x20000240, "GPL\000", 4); *(uint32_t*)0x200000d8 = 0; *(uint32_t*)0x200000dc = 0; *(uint64_t*)0x200000e0 = 0; *(uint32_t*)0x200000e8 = 0; *(uint32_t*)0x200000ec = 0; memset((void*)0x200000f0, 0, 16); *(uint32_t*)0x20000100 = 0; *(uint32_t*)0x20000104 = 0; *(uint32_t*)0x20000108 = -1; *(uint32_t*)0x2000010c = 0; *(uint64_t*)0x20000110 = 0; *(uint32_t*)0x20000118 = 0; *(uint32_t*)0x2000011c = 0; *(uint64_t*)0x20000120 = 0; *(uint32_t*)0x20000128 = 0; *(uint32_t*)0x2000012c = 0; *(uint32_t*)0x20000130 = 0; *(uint32_t*)0x20000134 = 0; *(uint64_t*)0x20000138 = 0; *(uint64_t*)0x20000140 = 0; *(uint32_t*)0x20000148 = 0; *(uint32_t*)0x2000014c = 0; res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000c0ul, /*size=*/0x90ul); if (res != -1) r[1] = res; *(uint64_t*)0x20000300 = 0x20000180; memcpy((void*)0x20000180, "workqueue_activate_work\000", 24); *(uint32_t*)0x20000308 = r[1]; syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x20000300ul, /*size=*/0x10ul); } 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); loop(); return 0; }