// https://syzkaller.appspot.com/bug?id=b482d6133396a72935d0476c05fa0a0004c25217 // 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[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*)0x20000080 = 0x11; *(uint32_t*)0x20000084 = 8; *(uint64_t*)0x20000088 = 0x20002580; memcpy( (void*)0x20002580, "\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\x1e\x7f\x2a\xa3\xd9" 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"\x23\x2f\xbe\xf6\x65\xf6\x21\x2f\x87\x5b\x2a\x00\x00\x00\x00\x00\x00\x00" "\xac\xeb\x11\x1b\x66\xa5\x00\xca\x52\xfd\x8f\x84\x80\x88\xc6\x7e\xe6\x5d" "\xfd\xcc\x4c\x58\x0e\x9b\xc1\x8c\x16\x99\xdc\xa0\x7d\x01\x9b\xf1\xbf\x9d" "\xd3\xda\x48\x0d\x6c\x15\x5d\x7e\x60\x67\x4c\xe8\x8a\xb5\xae\x07\xa9\xd1" "\x6e\x22\x79\x2d\x99\x98\x6b\x53\x1a\xb4\xe5\x92\xab\x59\x25\xda\x77\x9e" "\x70\x0c\xf2\x03\x09\xa2\x13\x78\x77\x69\x0d\xc5\xc0\x79\x56\xfc\x82\xd7" "\xb3\xbb\x46\xd3\x13\x80\x41\xaf\x18\x50\x89\x38\xc9\xbe\x4e\x5d\x0a\x98" "\x07\x34\x63\xa5\xcf\xf6\xc1\x46\xd0\x20\x74\x3d\xa4\x74\xcb\x81\x67\x7a" "\x6f\x38\x9f\x0e\x00\xc3\x3b\x70\xb7\xf8\xba\xb9\x54\x35\xc2\x71\x67\xf3" "\x65\xa2\x9f\xb0\x9c\xbf\x35\xbf\x19\x2f\x6a\x65\x61\x6f\xa2\xad\x9a\x6c" "\x7c\xa3\xa3\xec\xd9\x6a\xae\xcd\x99\x3e\x8b\xad\xb4\x0e\x7e\xb8\xa2\x2b" "\x00\x15\xe7\x0c\x88\x5c\xd5\x19\xe2\x84\x48\x16\x8c\x6d\x91\x42\x65\x99" "\x8b\xff\x74\xea\x1b\x0e\x65\x1a\x6c\xae\x94\x19\x09\x62\x48\xa0\xe4\x15" "\x73\x82\x7a\xd6\x0f\xaf\xce\x6e\x65\x40\x73\x4c\x1f\x23\xf7\x53\x37\xd8" "\x36\xc3\x14\x97\xe8\x11\x29\x69\xa0\x39\xd6\x5a\xa2\x97\xe2\xb0\x46\xb5" "\xf4\xd1\x11\x16\xa8\x9f\x9f\x65\x69\x3d\x4d\xc3\xe7\x0f\xbf\xe0\xb2\x04" "\x4f\xdb\x3f\x87\xe8\x87\xd1\xda\xae\x8e\x38\xa0\xc1\x9f\x66\x8f\x77\x6e" "\x19\xa0\x2b\xb2\x44\x9e\xe4\x38\x4f\x65\x36\x87\x9c\x85\xd7\xe4\x1b\xc0" "\x27\x6e\xe2\xb1\x25\xd4\x1f\xf3\x58\x32\x33\x11\x70\x3e\xc0\x1d\x64\xa5" "\x73\xbd\xeb\x75\xbd\xcc\x87\xd0\x1d\xe3\x83\x65\xab\x92\x22\x71\x3d\x2d" "\x16\x40\xa7\x42\xd6\x2f\xef\xb5\x40\x3b\x2e\xd9\x96\x9c\x32\xa0\x84\x1e" "\x8c\x36\xb0\x10\x7b\xb8\x88\xeb\x14\xac\x62\xe6\xd4\xbd\xfa\xeb\x9e\xe7" "\x43\x01\x00\xbf\x38\x25\xa1\x9d\x6c\x89\x97\xce\x28\x5e\xdf\x1d\x27\x7e" "\xd7\x03\xf5\x60\x46\x04\x17\xbf\xe7\x02\xaf\x83\x3e\x83\xc5\xb9\x87\xbe" "\xfb\x6d\x1f\xcf\x76\x5a\xb7\xea\x53\x7d\x9d\xaf\xb6\x22\xa1\xba\x86\x86" "\xcb\x15\x09\x63\xb8\x44\x70\x36\x49\x42\xe9\x0d\x1c\xf8\x56\xce\xad\x86" "\x4f\x5e\x38\xc8\x3b\x9e\xd8\x6c\xc5\x72\x5a\x20\x29\x9c\xe5\x12\xb1\x65" "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00", 4081); *(uint64_t*)0x20000090 = 0x20000380; memcpy((void*)0x20000380, "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 = 8; *(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 = 0x10; *(uint32_t*)0x200000ec = 0; *(uint32_t*)0x200000f0 = -1; *(uint32_t*)0x200000f4 = 0; *(uint64_t*)0x200000f8 = 0; *(uint64_t*)0x20000100 = 0; *(uint32_t*)0x20000108 = 0x10; *(uint32_t*)0x2000010c = 0; res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x20000080ul, /*size=*/0x2eul); if (res != -1) r[0] = res; *(uint64_t*)0x20000080 = 0x20000040; memcpy((void*)0x20000040, "kfree\000", 6); *(uint32_t*)0x20000088 = r[0]; syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x20000080ul, /*size=*/0x10ul); syscall(__NR_setsockopt, /*fd=*/-1, /*level=*/0x29, /*optname=*/0x3b, /*optval=*/0ul, /*optlen=*/0ul); *(uint32_t*)0x20000340 = 2; *(uint32_t*)0x20000344 = 4; *(uint32_t*)0x20000348 = 8; *(uint32_t*)0x2000034c = 1; *(uint32_t*)0x20000350 = 0x80; *(uint32_t*)0x20000354 = -1; *(uint32_t*)0x20000358 = 0; memset((void*)0x2000035c, 0, 16); *(uint32_t*)0x2000036c = 0; *(uint32_t*)0x20000370 = -1; *(uint32_t*)0x20000374 = 0; *(uint32_t*)0x20000378 = 0; *(uint32_t*)0x2000037c = 0; *(uint64_t*)0x20000380 = 0; res = syscall(__NR_bpf, /*cmd=*/0ul, /*arg=*/0x20000340ul, /*size=*/0x48ul); if (res != -1) r[1] = res; *(uint32_t*)0x20000480 = r[1]; syscall(__NR_bpf, /*cmd=*/0x16ul, /*arg=*/0x20000480ul, /*size=*/4ul); *(uint32_t*)0x200004c0 = 0x11; *(uint32_t*)0x200004c4 = 0x18; *(uint64_t*)0x200004c8 = 0x200001c0; memcpy((void*)0x200001c0, "\x18\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\xb7" "\x08\x00\x00\x00\x00\x00\x00\x7b\x8a\xf8\xff\x00\x00\x00\x00\xb7\x08" "\x00\x00\x00\x00\x00\x00\x7b\x8a\xf0\xff\x00\x00\x00\x00\xbf\xa1\x00" "\x00\x00\x00\x00\x00\x07\x01\x00\x00\xf8\xff\xff\xff\xbf\xa4\x00\x00" "\x00\x00\x00\x00\x07\x04\x00\x00\xf0\xff\xff\xff\xb7\x02\x00\x00\x00" "\x00\x00\x00\x18\x23\x00\x00", 92); *(uint32_t*)0x2000021c = r[1]; memcpy( (void*)0x20000220, "\x00\x00\x00\x00\x00\x00\x00\x00\xb7\x05\x00\x00\x00\x00\x00\x00\x85\x00" "\x00\x00\xa5\x00\x00\x00\x18\x01\x00\x00\x20\x20\x64\x05\x00\x00\x00\x00" "\x00\x20\x20\x20\x7b\x1a\xf8\xff\x00\x00\x00\x00\xbf\xa1\x00\x00\x00\x00" "\x00\x00\x07\x01\x00\x00\xf8\xff\xff\xff\xb7\x02\x00\x00\x08\x00\x00\x00" "\xb7\x03\x00\x00\x00\x00\x00\x00\xa5\x00\x00\x00\x08\x00\x00\x00\x95", 89); *(uint64_t*)0x200004d0 = 0x20000600; memcpy((void*)0x20000600, "GPL\000", 4); *(uint32_t*)0x200004d8 = 0; *(uint32_t*)0x200004dc = 0; *(uint64_t*)0x200004e0 = 0; *(uint32_t*)0x200004e8 = 0; *(uint32_t*)0x200004ec = 0; memset((void*)0x200004f0, 0, 16); *(uint32_t*)0x20000500 = 0; *(uint32_t*)0x20000504 = 0; *(uint32_t*)0x20000508 = 0; *(uint32_t*)0x2000050c = 0; *(uint64_t*)0x20000510 = 0; *(uint32_t*)0x20000518 = 0; *(uint32_t*)0x2000051c = 0; *(uint64_t*)0x20000520 = 0; *(uint32_t*)0x20000528 = 0; *(uint32_t*)0x2000052c = 0; *(uint32_t*)0x20000530 = 0; *(uint32_t*)0x20000534 = 0; *(uint64_t*)0x20000538 = 0; *(uint64_t*)0x20000540 = 0; *(uint32_t*)0x20000548 = 0; *(uint32_t*)0x2000054c = 0; res = syscall(__NR_bpf, /*cmd=*/5ul, /*arg=*/0x200004c0ul, /*size=*/0x90ul); if (res != -1) r[2] = res; *(uint64_t*)0x200001c0 = 0x20000000; memcpy((void*)0x20000000, "kfree\000", 6); *(uint32_t*)0x200001c8 = r[2]; syscall(__NR_bpf, /*cmd=*/0x11ul, /*arg=*/0x200001c0ul, /*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); for (procid = 0; procid < 5; procid++) { if (fork() == 0) { loop(); } } sleep(1000000); return 0; }