// https://syzkaller.appspot.com/bug?id=90cd06695bd4650a5228385b4b02f370ef9c219f // 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 unsigned long long procid; struct fs_image_segment { void* data; uintptr_t size; uintptr_t offset; }; #define IMAGE_MAX_SEGMENTS 4096 #define IMAGE_MAX_SIZE (129 << 20) #define SYZ_memfd_create 319 static long syz_mount_image(long fsarg, long dir, unsigned long size, unsigned long nsegs, long segments, long flags, long optsarg) { char loopname[64], fs[32], opts[256]; int loopfd, err = 0, res = -1; unsigned long i; struct fs_image_segment* segs = (struct fs_image_segment*)segments; if (nsegs > IMAGE_MAX_SEGMENTS) nsegs = IMAGE_MAX_SEGMENTS; for (i = 0; i < nsegs; i++) { if (segs[i].size > IMAGE_MAX_SIZE) segs[i].size = IMAGE_MAX_SIZE; segs[i].offset %= IMAGE_MAX_SIZE; if (segs[i].offset > IMAGE_MAX_SIZE - segs[i].size) segs[i].offset = IMAGE_MAX_SIZE - segs[i].size; if (size < segs[i].offset + segs[i].offset) size = segs[i].offset + segs[i].offset; } if (size > IMAGE_MAX_SIZE) size = IMAGE_MAX_SIZE; int memfd = syscall(SYZ_memfd_create, "syz_mount_image", 0); if (memfd == -1) { err = errno; goto error; } if (ftruncate(memfd, size)) { err = errno; goto error_close_memfd; } for (i = 0; i < nsegs; i++) { if (pwrite(memfd, segs[i].data, segs[i].size, segs[i].offset) < 0) { } } snprintf(loopname, sizeof(loopname), "/dev/loop%llu", procid); loopfd = open(loopname, O_RDWR); if (loopfd == -1) { err = errno; goto error_close_memfd; } if (ioctl(loopfd, LOOP_SET_FD, memfd)) { if (errno != EBUSY) { err = errno; goto error_close_loop; } ioctl(loopfd, LOOP_CLR_FD, 0); usleep(1000); if (ioctl(loopfd, LOOP_SET_FD, memfd)) { err = errno; goto error_close_loop; } } mkdir((char*)dir, 0777); memset(fs, 0, sizeof(fs)); strncpy(fs, (char*)fsarg, sizeof(fs) - 1); memset(opts, 0, sizeof(opts)); strncpy(opts, (char*)optsarg, sizeof(opts) - 32); if (strcmp(fs, "iso9660") == 0) { flags |= MS_RDONLY; } else if (strncmp(fs, "ext", 3) == 0) { if (strstr(opts, "errors=panic") || strstr(opts, "errors=remount-ro") == 0) strcat(opts, ",errors=continue"); } else if (strcmp(fs, "xfs") == 0) { strcat(opts, ",nouuid"); } if (mount(loopname, (char*)dir, fs, flags, opts)) { err = errno; goto error_clear_loop; } res = 0; error_clear_loop: ioctl(loopfd, LOOP_CLR_FD, 0); error_close_loop: close(loopfd); error_close_memfd: close(memfd); error: errno = err; return res; } uint64_t r[3] = {0xffffffffffffffff, 0xffffffffffffffff, 0xffffffffffffffff}; int main(void) { syscall(__NR_mmap, 0x20000000, 0x1000000, 3, 0x32, -1, 0); long res = 0; memcpy((void*)0x20000000, "/dev/kvm", 9); res = syscall(__NR_openat, 0xffffffffffffff9c, 0x20000000, 0, 0); if (res != -1) r[0] = res; res = syscall(__NR_ioctl, r[0], 0xae01, 0); if (res != -1) r[1] = res; res = syscall(__NR_ioctl, r[1], 0xae41, 0); if (res != -1) r[2] = res; *(uint32_t*)0x20000300 = 0; *(uint32_t*)0x20000304 = 0; *(uint64_t*)0x20000308 = 0; *(uint64_t*)0x20000310 = 0; *(uint64_t*)0x20000318 = 0; *(uint64_t*)0x20000320 = 0; *(uint8_t*)0x20000328 = 0; *(uint8_t*)0x20000329 = 0; *(uint8_t*)0x2000032a = 0; *(uint8_t*)0x2000032b = 0; *(uint8_t*)0x2000032c = 0; *(uint8_t*)0x2000032d = 0; *(uint8_t*)0x2000032e = 0; *(uint8_t*)0x2000032f = 0; *(uint8_t*)0x20000330 = 0; *(uint8_t*)0x20000331 = 0; *(uint8_t*)0x20000332 = 0; *(uint8_t*)0x20000333 = 0; *(uint8_t*)0x20000334 = 0; *(uint8_t*)0x20000335 = 0; *(uint8_t*)0x20000336 = 0; *(uint8_t*)0x20000337 = 0; *(uint8_t*)0x20000338 = 0; *(uint8_t*)0x20000339 = 0; *(uint8_t*)0x2000033a = 0; *(uint8_t*)0x2000033b = 0; *(uint8_t*)0x2000033c = 0; *(uint8_t*)0x2000033d = 0; *(uint8_t*)0x2000033e = 0; *(uint8_t*)0x2000033f = 0; *(uint8_t*)0x20000340 = 0; *(uint8_t*)0x20000341 = 0; *(uint8_t*)0x20000342 = 0; *(uint8_t*)0x20000343 = 0; *(uint8_t*)0x20000344 = 0; *(uint8_t*)0x20000345 = 0; *(uint8_t*)0x20000346 = 0; *(uint8_t*)0x20000347 = 0; *(uint8_t*)0x20000348 = 0; *(uint8_t*)0x20000349 = 0; *(uint8_t*)0x2000034a = 0; *(uint8_t*)0x2000034b = 0; *(uint8_t*)0x2000034c = 0; *(uint8_t*)0x2000034d = 0; *(uint8_t*)0x2000034e = 0; *(uint8_t*)0x2000034f = 0; *(uint8_t*)0x20000350 = 0; *(uint8_t*)0x20000351 = 0; *(uint8_t*)0x20000352 = 0; *(uint8_t*)0x20000353 = 0; *(uint8_t*)0x20000354 = 0; *(uint8_t*)0x20000355 = 0; *(uint8_t*)0x20000356 = 0; *(uint8_t*)0x20000357 = 0; *(uint8_t*)0x20000358 = 0; *(uint8_t*)0x20000359 = 0; *(uint8_t*)0x2000035a = 0; *(uint8_t*)0x2000035b = 0; *(uint8_t*)0x2000035c = 0; *(uint8_t*)0x2000035d = 0; *(uint8_t*)0x2000035e = 0; *(uint8_t*)0x2000035f = 0; *(uint8_t*)0x20000360 = 0; *(uint8_t*)0x20000361 = 0; *(uint8_t*)0x20000362 = 0; *(uint8_t*)0x20000363 = 0; *(uint8_t*)0x20000364 = 0; *(uint8_t*)0x20000365 = 0; *(uint8_t*)0x20000366 = 0; *(uint8_t*)0x20000367 = 0; syscall(__NR_ioctl, r[2], 0x4080aebf, 0x20000300); memcpy((void*)0x200000c0, "ext3", 5); memcpy((void*)0x200001c0, "./file0", 8); *(uint64_t*)0x20000040 = 0x20000300; *(uint64_t*)0x20000048 = 0; *(uint64_t*)0x20000050 = 0x400; *(uint8_t*)0x20000000 = 0; syz_mount_image(0x200000c0, 0x200001c0, 0, 1, 0x20000040, 0, 0x20000000); return 0; }