// https://syzkaller.appspot.com/bug?id=f00aada4bedaebb8fe76a92659bb73928759d45a // 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; } 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*)0x20000080 = 0x11; *(uint32_t*)0x20000084 = 8; *(uint64_t*)0x20000088 = 0x20000900; memcpy( (void*)0x20000900, "\x62\x0a\xf8\xff\x0c\x20\x00\x21\xbf\xa1\x00\x00\x00\x00\x00\x00\x07\x01" "\x00\x00\xf8\xff\xff\xff\xb7\x02\x00\x00\x03\x00\x00\x00\xbd\x12\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\x00\x00\x00\x00\x00\x3f\xaf\x4f\x2a\xa3\xd9\xb1\x8e" "\xd8\x12\xa2\xe2\xc4\x9e\x80\x20\xa6\xf4\xe0\xe4\xa9\x44\x6c\x76\x70\x56" "\x89\x82\xb4\xe0\x20\xf6\x98\x39\x3a\xa0\xf3\x88\x1f\x9c\x24\xaa\x56\xf1" 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"\x03\x09\xe1\xe2\x45\xb0\xfd\xf9\x74\x3a\xf9\x32\xcd\x6d\xb4\x9a\x47\x61" "\x38\x08\xba\xd9\x59\x71\x9c\x00\x00\x00\x00\x00\x37\x8a\xc2\xe2\x4c\x7e" "\x80\x00\x03\xc9\xe8\x09\x5e\x02\x98\x5f\x28\xe6\x78\xf6\x64\x22\x43\x6f" "\x94\x9e\x2a\xb8\xf1\x62\xd7\xe3\xf8\x55\xe3\x78\xf4\xa1\xf4\x0b\x0c\x6f" "\xb2\xd4\xb2\x05\xa8\x00\xb6\xd7\x13\xac\xeb\xc5\xb0\x14\xe6\x1a\x54\x3a" "\x5a\x19\x4f\x9a\xc1\x8d\x76\xb5\x44\x0e\x3b\x1a\x56\x9e\x73\x97\xf6\xca" "\xfa\x86\x96\x6d\x7b\xa1\x9e\x72\x04\x13\x26\x7a\x6c\xce\xa9\xc4\x39\x67" "\x1d\x2c\x68\x0f\x27\x53\xca\x18\x4e\xee\xb8\x43\x45\x03\x68\xac\xb4\x38" "\x3a\x01\xd2\x5e\xb3\xd1\xe2\x3e\x0f\x26\x45\xd1\xcd\xfa\x9f\xa4\x10\x63" "\x2f\x95\xa5\xf6\x22\xf8\x51\xc6\x6e\xe7\xe3\x03\x01\x00\x00\x00\x00\x00" "\x00\x00\xc4\xf9\x3c\x09\x84\xb5\xc2\xd4\x52\x34\x97\xe4\xd6\x4f\x95\xf0" "\x84\x93\x56\x4a\x1d\xf8\x71\x11\xc9\xbf\xfe\xf9\x7d\xce\xcc\x46\x7a\xce" "\x45\x65\x97\x68\x5c\x58\x70\xd0\x5f\x88\xa0\xf4\x63\xdb\x88\xd3\x77\x44" "\x2e\x13\x49\xac\xaf\x76\x62\x18\xb5\x4a\x9d\x62\x47\x78\xe1\xc4\xcb\xa6" "\xe6\x39\x0a\x9f\x30\x2c\x6e\xb2\xdf\x77\x66\x41\x1b\xef\x0e\xbb\x50\x00" "\x00\x00\x00\x00\x60\x65\xd6\x73\x5e\xb7\xa0\x0e\x12\x7c\x00\x00\x00\x00" "\x00\x00\x00\x00\x00\x00\x00\xbf\xb0\xbb\xa7\x93\x44\x64\x3b\x1d\x8d\xaa" "\x9f\x38\xe4\xb6\x2c\x1e\x2a\xf2\x8c\x6f\x50\x54\xb0\x78\xac\xd7\x4b\x4a" "\x9c\x94\x4e\x45\x05\xda\x48\x5a\x3a\x41\x54\x38\x7a\x0a\x88\x37\x0d\x9e" "\xd9\x46\x7b\x09\xc5\x88\x8a\x06\x43\x1d\xf3\xf6\x8a\xbf\x0b\x36\x6c\x4d" "\x5f\x8b\xea\x7b\x29\xc2\x57\xed\x75\x6d\xff\x7a\x21\xc6\xb6\x61\xcb\xdd" "\x43\xde\x65\xaf\xd7\xf6\x61\xd5\xc8\x4f\x91\x5c\x90\xe3\xd6\xea\x01\x2b" "\x68\xb7\x87\xeb\x01\xd8\x32\x00\x00\x00\x00\x00\x00\x00\x60\x17\x6d\xac" "\xba\x0e\xc5\x03\xa3\x7f\xae\x6b\x47\x2e\xc3\x69\xc7\x9e\xe6\xa4\x20\xc0" "\xfd\x8d\x8d\x82\xfe\x13\x6d\x5a\xf6\xc3\x0b\xfe\xb0\xa7\x27\x5b\xab\xfd" "\xb9\x6a\x12\x7a\xa9\x38\x6e\x06\x71\xc6\x45\x42\x45\xa1\x8c\x1c\x8c\x49" "\x55\x2c\xff\x5d\x27\xb5\x47\xcd\xc3\x4c\x08\x58\xc7\x7a\x47\xa9\x8d\x86" "\xee\x9f\xbd\x9c\xed\xa4\x28\x71\x6a\x42\x18\x82\x11\x76\xd8\x06\x79\x97" "\x52\x72\x30\xfa\x67\xd2\x69\x50\xd3\xe4\xf2\x75\x0f\xa7\xc8\x72\x87\x4a" "\xd3\xa2\xd1\x1f\x9f\x6e\xb0\x8e\x6d\x7b\x6f\xa2\x57\xb0\x4d\x8c\xe3\x63" "\x60\xf5\x24\xe3\xdf\xd2\x21\x16\x41\xf3\xd2\x63\x7d\x86\xb8\x06\x81\xec" "\xa5\x0c\xe0\xee\xca\xfd\xd2\x2d\x41\xfa\x51\x5c\x15\x59\x1e\x70\xde\xd4" "\xb7\x0e\xfa\xc3\xcb\x42\xfb\x35\x2d\x82\xe8\xf7\x57\x3e\x8e\xd8\x24\x8d" "\xa3\x56\xfa\x91\xa2\x52\x91\x6d\x3a\x4d\x8c\x18\x43\xa8\x29\x2f\x63\xff" "\xc5\x83\xf0\xc5\x97\x51\x4b\x89\xef\x99\x14\x89\x35\x53\xab\xb7\x6d\xa5" "\x52\xfb", 2846); *(uint64_t*)0x20000090 = 0x20000100; memcpy((void*)0x20000100, "GPL\000", 4); *(uint32_t*)0x20000098 = 0; *(uint32_t*)0x2000009c = 0; *(uint64_t*)0x200000a0 = 0; *(uint32_t*)0x200000a8 = 0; *(uint32_t*)0x200000ac = 0; memset((void*)0x200000b0, 0, 16); *(uint32_t*)0x200000c0 = 0; *(uint32_t*)0x200000c4 = 0; *(uint32_t*)0x200000c8 = -1; *(uint32_t*)0x200000cc = 8; *(uint64_t*)0x200000d0 = 0x20000000; *(uint32_t*)0x20000000 = 0; *(uint32_t*)0x20000004 = 0; *(uint32_t*)0x200000d8 = 0; *(uint32_t*)0x200000dc = 0x10; *(uint64_t*)0x200000e0 = 0x20000000; *(uint32_t*)0x20000000 = 0; *(uint32_t*)0x20000004 = 0; *(uint32_t*)0x20000008 = 0; *(uint32_t*)0x2000000c = 0; *(uint32_t*)0x200000e8 = 0; *(uint32_t*)0x200000ec = 0; *(uint32_t*)0x200000f0 = -1; *(uint32_t*)0x200000f4 = 0; *(uint64_t*)0x200000f8 = 0; res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x20000080ul, /*size=*/0x48ul); if (res != -1) r[0] = res; *(uint64_t*)0x20000280 = 0x200001c0; memcpy((void*)0x200001c0, "contention_end\000", 15); *(uint32_t*)0x20000288 = r[0]; syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x20000280ul, /*size=*/0x10ul); syscall(__NR_perf_event_open, /*attr=*/0ul, /*pid=*/0, /*cpu=*/0ul, /*group=*/-1, /*flags=*/0ul); syscall(__NR_openat, /*fd=*/0xffffff9c, /*file=*/0ul, /*flags=*/0x26e1ul, /*mode=*/0ul); } int main(void) { syscall(__NR_mmap, /*addr=*/0x1ffff000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x20000000ul, /*len=*/0x1000000ul, /*prot=*/7ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); syscall(__NR_mmap, /*addr=*/0x21000000ul, /*len=*/0x1000ul, /*prot=*/0ul, /*flags=*/0x32ul, /*fd=*/-1, /*offset=*/0ul); for (procid = 0; procid < 6; procid++) { if (fork() == 0) { loop(); } } sleep(1000000); return 0; }