// https://syzkaller.appspot.com/bug?id=9c939dbe2cc262b09af9bee50d33daf15f9bd5eb // autogenerated by syzkaller (https://github.com/google/syzkaller) #define _GNU_SOURCE #include #include #include #include #include #include #include #include #include #include static long syz_open_procfs(volatile long a0, volatile long a1) { char buf[128]; memset(buf, 0, sizeof(buf)); if (a0 == 0) { snprintf(buf, sizeof(buf), "/proc/self/%s", (char*)a1); } else if (a0 == -1) { snprintf(buf, sizeof(buf), "/proc/thread-self/%s", (char*)a1); } else { snprintf(buf, sizeof(buf), "/proc/self/task/%d/%s", (int)a0, (char*)a1); } int fd = open(buf, O_RDWR); if (fd == -1) fd = open(buf, O_RDONLY); return fd; } uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; int main(void) { syscall(__NR_mmap, 0x1ffff000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x20000000ul, 0x1000000ul, 7ul, 0x32ul, -1, 0ul); syscall(__NR_mmap, 0x21000000ul, 0x1000ul, 0ul, 0x32ul, -1, 0ul); intptr_t res = 0; memcpy((void*)0x20000180, "./file0\000", 8); syscall(__NR_mkdir, 0x20000180ul, 0ul); memcpy((void*)0x20000300, "./bus\000", 6); syscall(__NR_mkdir, 0x20000300ul, 0ul); memcpy((void*)0x200002c0, "./file1\000", 8); syscall(__NR_mkdir, 0x200002c0ul, 0ul); memcpy((void*)0x20000040, "./bus\000", 6); memcpy((void*)0x20000080, "overlay\000", 8); memcpy((void*)0x20000280, "upperdir=./bus,workdir=./file1,lowerdir=./file0", 47); syscall(__NR_mount, 0ul, 0x20000040ul, 0x20000080ul, 0ul, 0x20000280ul); memcpy((void*)0x200001c0, "./bus\000", 6); syscall(__NR_chdir, 0x200001c0ul); memcpy((void*)0x20000400, "./file0\000", 8); syscall(__NR_execve, 0x20000400ul, 0ul, 0ul); memcpy((void*)0x20000040, "net/ip6_tables_targets\000", 23); res = -1; res = syz_open_procfs(0, 0x20000040); if (res != -1) r[0] = res; memcpy((void*)0x20002000, "./bus\000", 6); res = syscall(__NR_open, 0x20002000ul, 0x101842ul, 0ul); if (res != -1) r[1] = res; syscall(__NR_sendfile, r[1], r[0], 0ul, 5ul); memcpy((void*)0x20000040, "personality\000", 12); res = -1; res = syz_open_procfs(0, 0x20000040); if (res != -1) r[2] = res; *(uint64_t*)0x20000280 = 0x200000c0; *(uint64_t*)0x20000288 = 0x1d; syscall(__NR_preadv, r[2], 0x20000280ul, 1ul, 0, 0); return 0; }