// https://syzkaller.appspot.com/bug?id=76b41c8135884c37dd1a66da8043330d13d64506 // 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 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 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[1] = {0xffffffffffffffff}; void execute_one(void) { intptr_t res = 0; *(uint32_t*)0x20000000 = 1; *(uint32_t*)0x20000004 = 8; *(uint64_t*)0x20000008 = 0x20001000; memcpy((void*)0x20001000, "\x7a\x0a\xf8\xff\x75\x25\x70\x25\xbf\xa1\x00\x00\x00\x00\x00\x00\x07" "\x01\x00\x00\xf8\xff\xff\xff\xb7\x02\x00\x00\x05\x00\x00\x00\xbf\x13" "\x00\x00\x00\x00\x00\x00\x85\x00\x00\x00\x06\x00\x00\x00\xb7\x00\x00" "\x00\x00\x00\x00\x00\x95\x00\x00\xff\x00\x00\x00\x00", 64); *(uint64_t*)0x20000010 = 0x20000100; memcpy((void*)0x20000100, "GPL\000", 4); *(uint32_t*)0x20000018 = 0; *(uint32_t*)0x2000001c = 0; *(uint64_t*)0x20000020 = 0; *(uint32_t*)0x20000028 = 0; *(uint32_t*)0x2000002c = 0; memset((void*)0x20000030, 0, 16); *(uint32_t*)0x20000040 = 0; *(uint32_t*)0x20000044 = 0; *(uint32_t*)0x20000048 = -1; *(uint32_t*)0x2000004c = 8; *(uint64_t*)0x20000050 = 0; *(uint32_t*)0x20000058 = 0; *(uint32_t*)0x2000005c = 0x10; *(uint64_t*)0x20000060 = 0; *(uint32_t*)0x20000068 = 0; *(uint32_t*)0x2000006c = 0; *(uint32_t*)0x20000070 = -1; *(uint32_t*)0x20000074 = 0; *(uint64_t*)0x20000078 = 0; *(uint64_t*)0x20000080 = 0; *(uint32_t*)0x20000088 = 0x10; *(uint32_t*)0x2000008c = 0; res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x20000000ul, /*size=*/0x48ul); if (res != -1) r[0] = res; *(uint32_t*)0x20000080 = r[0]; *(uint32_t*)0x20000084 = 0x2000000; *(uint32_t*)0x20000088 = 0xe; *(uint32_t*)0x2000008c = 0x55; *(uint64_t*)0x20000090 = 0x20000140; memcpy((void*)0x20000140, "\xa0\x6a\xd8\x76\xd5\x6a\x00\x64\xd0\x82\x77\x8c\x39\x38", 14); *(uint64_t*)0x20000098 = 0x20000380; *(uint32_t*)0x200000a0 = 0; *(uint32_t*)0x200000a4 = 0x4000000; *(uint32_t*)0x200000a8 = 0; *(uint32_t*)0x200000ac = 0; *(uint64_t*)0x200000b0 = 0x20000000; *(uint64_t*)0x200000b8 = 0x20000000; *(uint32_t*)0x200000c0 = 0; *(uint32_t*)0x200000c4 = 0; *(uint32_t*)0x200000c8 = 0; syscall(__NR_bpf, /*cmd=*/0xaul, /*arg=*/0x20000080ul, /*size=*/0x28ul); } 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; }