// https://syzkaller.appspot.com/bug?id=3b6a05622c30f88ed585de2085fffc3440d4104a // 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_bpf #define __NR_bpf 321 #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; } #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 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 int inject_fault(int nth) { int fd; fd = open("/proc/thread-self/fail-nth", O_RDWR); if (fd == -1) exit(1); char buf[16]; sprintf(buf, "%d", nth); if (write(fd, buf, strlen(buf)) != (ssize_t)strlen(buf)) exit(1); return fd; } 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 const char* setup_fault() { int fd = open("/proc/self/make-it-fail", O_WRONLY); if (fd == -1) return "CONFIG_FAULT_INJECTION is not enabled"; close(fd); fd = open("/proc/thread-self/fail-nth", O_WRONLY); if (fd == -1) return "kernel does not have systematic fault injection support"; close(fd); static struct { const char* file; const char* val; bool fatal; } files[] = { {"/sys/kernel/debug/failslab/ignore-gfp-wait", "N", true}, {"/sys/kernel/debug/fail_futex/ignore-private", "N", false}, {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-highmem", "N", false}, {"/sys/kernel/debug/fail_page_alloc/ignore-gfp-wait", "N", false}, {"/sys/kernel/debug/fail_page_alloc/min-order", "0", false}, }; unsigned i; for (i = 0; i < sizeof(files) / sizeof(files[0]); i++) { if (!write_file(files[i].file, files[i].val)) { if (files[i].fatal) return "failed to write fault injection file"; } } return NULL; } 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[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; if (write(1, "executing program\n", sizeof("executing program\n") - 1)) { } *(uint32_t*)0x200000c0 = 0; *(uint32_t*)0x200000c4 = 0xc; *(uint64_t*)0x200000c8 = 0x20000180; *(uint8_t*)0x20000180 = 0x18; STORE_BY_BITMASK(uint8_t, , 0x20000181, 0, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000181, 0, 4, 4); *(uint16_t*)0x20000182 = 0; *(uint32_t*)0x20000184 = 8; *(uint8_t*)0x20000188 = 0; *(uint8_t*)0x20000189 = 0; *(uint16_t*)0x2000018a = 0; *(uint32_t*)0x2000018c = 0; *(uint8_t*)0x20000190 = 0x85; *(uint8_t*)0x20000191 = 0; *(uint16_t*)0x20000192 = 0; *(uint32_t*)0x20000194 = 0x23; *(uint8_t*)0x20000198 = 0x18; STORE_BY_BITMASK(uint8_t, , 0x20000199, 1, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x20000199, 0, 4, 4); *(uint16_t*)0x2000019a = 0; *(uint32_t*)0x2000019c = 0x25752020; *(uint8_t*)0x200001a0 = 0; *(uint8_t*)0x200001a1 = 0; *(uint16_t*)0x200001a2 = 0; *(uint32_t*)0x200001a4 = 0x20202000; STORE_BY_BITMASK(uint8_t, , 0x200001a8, 3, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x200001a8, 3, 3, 2); STORE_BY_BITMASK(uint8_t, , 0x200001a8, 3, 5, 3); STORE_BY_BITMASK(uint8_t, , 0x200001a9, 0xa, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200001a9, 1, 4, 4); *(uint16_t*)0x200001aa = 0xfff8; *(uint32_t*)0x200001ac = 0; STORE_BY_BITMASK(uint8_t, , 0x200001b0, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x200001b0, 1, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x200001b0, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x200001b1, 1, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200001b1, 0xa, 4, 4); *(uint16_t*)0x200001b2 = 0; *(uint32_t*)0x200001b4 = 0; STORE_BY_BITMASK(uint8_t, , 0x200001b8, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x200001b8, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x200001b8, 0, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x200001b9, 1, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200001b9, 0, 4, 4); *(uint16_t*)0x200001ba = 0; *(uint32_t*)0x200001bc = 0xfffffff8; STORE_BY_BITMASK(uint8_t, , 0x200001c0, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x200001c0, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x200001c0, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x200001c1, 2, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200001c1, 0, 4, 4); *(uint16_t*)0x200001c2 = 0; *(uint32_t*)0x200001c4 = 8; STORE_BY_BITMASK(uint8_t, , 0x200001c8, 7, 0, 3); STORE_BY_BITMASK(uint8_t, , 0x200001c8, 0, 3, 1); STORE_BY_BITMASK(uint8_t, , 0x200001c8, 0xb, 4, 4); STORE_BY_BITMASK(uint8_t, , 0x200001c9, 3, 0, 4); STORE_BY_BITMASK(uint8_t, , 0x200001c9, 0, 4, 4); *(uint16_t*)0x200001ca = 0; *(uint32_t*)0x200001cc = 5; *(uint8_t*)0x200001d0 = 0x85; *(uint8_t*)0x200001d1 = 0; *(uint16_t*)0x200001d2 = 0; *(uint32_t*)0x200001d4 = 0x2d; *(uint8_t*)0x200001d8 = 0x95; *(uint8_t*)0x200001d9 = 0; *(uint16_t*)0x200001da = 0; *(uint32_t*)0x200001dc = 0; *(uint64_t*)0x200000d0 = 0; *(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 = -1; *(uint32_t*)0x20000134 = 0; *(uint64_t*)0x20000138 = 0; *(uint64_t*)0x20000140 = 0; *(uint32_t*)0x20000148 = 0; *(uint32_t*)0x2000014c = 0; *(uint32_t*)0x20000150 = 0; syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000c0ul, /*size=*/0x94ul); *(uint32_t*)0x200000c0 = 0x11; *(uint32_t*)0x200000c4 = 0xc; *(uint64_t*)0x200000c8 = 0x20000180; *(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; *(uint32_t*)0x20000150 = 0; res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200000c0ul, /*size=*/0x90ul); if (res != -1) r[0] = res; *(uint64_t*)0x200002c0 = 0x20000280; memcpy((void*)0x20000280, "timer_start\000", 12); *(uint32_t*)0x200002c8 = r[0]; *(uint32_t*)0x200002cc = 0; *(uint64_t*)0x200002d0 = 0; syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x200002c0ul, /*size=*/0x10ul); res = -1; res = syz_open_dev(/*dev=*/0xc, /*major=*/4, /*minor=*/1); if (res != -1) r[1] = res; res = syscall(__NR_dup, /*oldfd=*/r[1]); if (res != -1) r[2] = res; inject_fault(3); syscall(__NR_write, /*fd=*/r[2], /*data=*/0ul, /*len=*/0ul); } 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; if ((reason = setup_fault())) printf("the reproducer may not work as expected: fault injection setup " "failed: %s\n", reason); for (procid = 0; procid < 4; procid++) { if (fork() == 0) { loop(); } } sleep(1000000); return 0; }