From: Kyle Hale <kh@u.northwestern.edu>
Date: Tue, 21 Jun 2011 03:08:46 +0000 (-0500)
Subject: matched extension file-naming conditions, changed a few ifdefs to match config files
X-Git-Url: http://v3vee.org/palacios/gitweb/gitweb.cgi?p=palacios.git;a=commitdiff_plain;h=98c9bb5e5f3df156ec40abda7d765974a99c1e0e

matched extension file-naming conditions, changed a few ifdefs to match config files
---

diff --git a/palacios/src/extensions/ext_execve_hook.c b/palacios/src/extensions/ext_execve_hook.c
new file mode 100644
index 0000000..e78052e
--- /dev/null
+++ b/palacios/src/extensions/ext_execve_hook.c
@@ -0,0 +1,94 @@
+/* 
+ * This file is part of the Palacios Virtual Machine Monitor developed
+ * by the V3VEE Project with funding from the United States National 
+ * Science Foundation and the Department of Energy.  
+ *
+ * The V3VEE Project is a joint project between Northwestern University
+ * and the University of New Mexico.  You can find out more at 
+ * http://www.v3vee.org
+ *
+ * Copyright (c) 2011, Kyle C. Hale <kh@u.norhtwestern.edu>
+ * Copyright (c) 2011, The V3VEE Project <http://www.v3vee.org> 
+ * All rights reserved.
+ *
+ * Author: Kyle C. Hale <kh@u.northwestern.edu>
+ *
+ * This is free software.  You are permitted to use,
+ * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
+ */
+
+
+#include <palacios/vmm.h>
+#include <palacios/vm_guest.h>
+#include <palacios/vmm_string.h>
+#include <palacios/vmm_syscall_hijack.h>
+#include <palacios/vmm_hashtable.h>
+#include <palacios/vmm_execve_hook.h>
+
+
+
+static int free_hook (struct guest_info * core, struct exec_hook * hook) {
+    list_del(&(hook->hook_node));
+    V3_Free(hook);
+    return 0;
+}
+    
+static uint_t exec_hash_fn (addr_t key) {
+    return v3_hash_long(key, sizeof(void *) * 8);
+}
+
+
+static int exec_eq_fn (addr_t key1, addr_t key2) {
+    return (key1 == key2);
+}
+
+
+int v3_init_exec_hooks (struct guest_info * core) {
+    struct v3_exec_hooks * hooks = &(core->exec_hooks);
+
+    INIT_LIST_HEAD(&(hooks->hook_list));
+
+    hooks->bin_table = v3_create_htable(0, exec_hash_fn, exec_eq_fn);
+    return 0;
+}
+
+
+int v3_deinit_exec_hooks (struct guest_info * core) {
+    struct v3_exec_hooks * hooks = &(core->exec_hooks);
+    struct exec_hook * hook = NULL;
+    struct exec_hook * tmp = NULL;
+    
+    list_for_each_entry_safe(hook, tmp, &(hooks->hook_list), hook_node) {
+        free_hook(core, hook);
+    }
+
+    v3_free_htable(hooks->bin_table, 0, 0);
+
+    return 0;
+}
+
+
+int v3_hook_executable (struct guest_info * core, 
+    const uchar_t * binfile,
+    int (*handler)(struct guest_info * core, void * priv_data),
+    void * priv_data) 
+{
+    struct exec_hook * hook = V3_Malloc(sizeof(struct exec_hook));
+    struct v3_exec_hooks * hooks = &(core->exec_hooks);
+    addr_t key;
+    
+    memset(hook, 0, sizeof(struct exec_hook));
+    
+    hook->handler = handler;
+    hook->priv_data = priv_data;
+    
+    // we hash the name of the file to produce a key
+    key = v3_hash_buffer((uchar_t*)binfile, strlen(binfile));
+
+    v3_htable_insert(hooks->bin_table, key, (addr_t)hook);
+    list_add(&(hook->hook_node), &(hooks->hook_list));
+
+    return 0;
+}
+
+
diff --git a/palacios/src/extensions/ext_linux_syscall_map.c b/palacios/src/extensions/ext_linux_syscall_map.c
new file mode 100644
index 0000000..578450d
--- /dev/null
+++ b/palacios/src/extensions/ext_linux_syscall_map.c
@@ -0,0 +1,672 @@
+/* 
+ * This file is part of the Palacios Virtual Machine Monitor developed
+ * by the V3VEE Project with funding from the United States National 
+ * Science Foundation and the Department of Energy.  
+ *
+ * The V3VEE Project is a joint project between Northwestern University
+ * and the University of New Mexico.  You can find out more at 
+ * http://www.v3vee.org
+ *
+ * Copyright (c) 2011, Kyle C. Hale <kh@u.norhtwestern.edu>
+ * Copyright (c) 2011, The V3VEE Project <http://www.v3vee.org> 
+ * All rights reserved.
+ *
+ * Author: Kyle C. Hale <kh@u.northwestern.edu>
+ *
+ * This is free software.  You are permitted to use,
+ * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
+ */
+
+
+#include <palacios/vmm_linux_syscall_map.h>
+
+
+char * get_linux_syscall_name32 (uint_t syscall_nr) { 
+
+    switch (syscall_nr) { 
+
+        case 0: return "restart_syscall"; break;
+        case 1: return "exit"; break;
+        case 2: return "fork"; break;
+        case 3: return "read"; break;
+        case 4: return "write"; break;
+        case 5: return "open"; break;
+        case 6: return "close"; break;
+        case 7: return "waitpid"; break;
+        case 8: return "creat"; break;
+        case 9: return "link"; break;
+        case 10: return "unlink"; break;
+        case 11: return "execve"; break;
+        case 12: return "chdir"; break;
+        case 13: return "time"; break;
+        case 14: return "mknod"; break;
+        case 15: return "chmod"; break;
+        case 16: return "lchown"; break;
+        case 17: return "break"; break;
+        case 18: return "oldstat"; break;
+        case 19: return "lseek"; break;
+        case 20: return "getpid"; break;
+        case 21: return "mount"; break;
+        case 22: return "umount"; break;
+        case 23: return "setuid"; break;
+        case 24: return "getuid"; break;
+        case 25: return "stime"; break;
+        case 26: return "ptrace"; break;
+        case 27: return "alarm"; break;
+        case 28: return "oldfstat"; break;
+        case 29: return "pause"; break;
+        case 30: return "utime"; break;
+        case 31: return "stty"; break;
+        case 32: return "gtty"; break;
+        case 33: return "access"; break;
+        case 34: return "nice"; break;
+        case 35: return "ftime"; break;
+        case 36: return "sync"; break;
+        case 37: return "kill"; break;
+        case 38: return "rename"; break;
+        case 39: return "mkdir"; break;
+        case 40: return "rmdir"; break;
+        case 41: return "dup"; break;
+        case 42: return "pipe"; break;
+        case 43: return "times"; break;
+        case 44: return "prof"; break;
+        case 45: return "brk"; break;
+        case 46: return "setgid"; break;
+        case 47: return "getgid"; break;
+        case 48: return "signal"; break;
+        case 49: return "geteuid"; break;
+        case 50: return "getegid"; break;
+        case 51: return "acct"; break;
+        case 52: return "umount2"; break;
+        case 53: return "lock"; break;
+        case 54: return "ioctl"; break;
+        case 55: return "fcntl"; break;
+        case 56: return "mpx"; break;
+        case 57: return "setpgid"; break;
+        case 58: return "ulimit"; break;
+        case 59: return "oldolduname"; break;
+        case 60: return "umask"; break;
+        case 61: return "chroot"; break;
+        case 62: return "ustat"; break;
+        case 63: return "dup2"; break;
+        case 64: return "getppid"; break;
+        case 65: return "getpgrp"; break;
+        case 66: return "setsid"; break;
+        case 67: return "sigaction"; break;
+        case 68: return "sgetmask"; break;
+        case 69: return "ssetmask"; break;
+        case 70: return "setreuid"; break;
+        case 71: return "setregid"; break;
+        case 72: return "sigsuspend"; break;
+        case 73: return "sigpending"; break;
+        case 74: return "sethostname"; break;
+        case 75: return "setrlimit"; break;
+        case 76: return "getrlimit"; break;
+        case 77: return "getrusage"; break;
+        case 78: return "gettimeofday"; break;
+        case 79: return "settimeofday"; break;
+        case 80: return "getgroups"; break;
+        case 81: return "setgroups"; break;
+        case 82: return "select"; break;
+        case 83: return "symlink"; break;
+        case 84: return "oldlstat"; break;
+        case 85: return "readlink"; break;
+        case 86: return "uselib"; break;
+        case 87: return "swapon"; break;
+        case 88: return "reboot"; break;
+        case 89: return "readdir"; break;
+        case 90: return "mmap"; break;
+        case 91: return "munmap"; break;
+        case 92: return "truncate"; break;
+        case 93: return "ftruncate"; break;
+        case 94: return "fchmod"; break;
+        case 95: return "fchown"; break;
+        case 96: return "getpriority"; break;
+        case 97: return "setpriority"; break;
+        case 98: return "profil"; break;
+        case 99: return "statfs"; break;
+        case 100: return "fstatfs"; break;
+        case 101: return "ioperm"; break;
+        case 102: return "socketcall"; break;
+        case 103: return "syslog"; break;
+        case 104: return "setitimer"; break;
+        case 105: return "getitimer"; break;
+        case 106: return "stat"; break;
+        case 107: return "lstat"; break;
+        case 108: return "fstat"; break;
+        case 109: return "olduname"; break;
+        case 110: return "iopl"; break;
+        case 111: return "vhangup"; break;
+        case 112: return "idle"; break;
+        case 113: return "vm86old"; break;
+        case 114: return "wait4"; break;
+        case 115: return "swapoff"; break;
+        case 116: return "sysinfo"; break;
+        case 117: return "ipc"; break;
+        case 118: return "fsync"; break;
+        case 119: return "sigreturn"; break;
+        case 120: return "clone"; break;
+        case 121: return "setdomainname"; break;
+        case 122: return "uname"; break;
+        case 123: return "modify_ldt"; break;
+        case 124: return "adjtimex"; break;
+        case 125: return "mprotect"; break;
+        case 126: return "sigprocmask"; break;
+        case 127: return "create_module"; break;
+        case 128: return "init_module"; break;
+        case 129: return "delete_module"; break;
+        case 130: return "get_kernel_syms"; break;
+        case 131: return "quotactl"; break;
+        case 132: return "getpgid"; break;
+        case 133: return "fchdir"; break;
+        case 134: return "bdflush"; break;
+        case 135: return "sysfs"; break;
+        case 136: return "personality"; break;
+        case 137: return "afs_syscall"; break;
+        case 138: return "setfsuid"; break;
+        case 139: return "setfsgid"; break;
+        case 140: return "_llseek"; break;
+        case 141: return "getdents"; break;
+        case 142: return "_newselect"; break;
+        case 143: return "flock"; break;
+        case 144: return "msync"; break;
+        case 145: return "readv"; break;
+        case 146: return "writev"; break;
+        case 147: return "getsid"; break;
+        case 148: return "fdatasync"; break;
+        case 149: return "_sysctl"; break;
+        case 150: return "mlock"; break;
+        case 151: return "munlock"; break;
+        case 152: return "mlockall"; break;
+        case 153: return "munlockall"; break;
+        case 154: return "sched_setparam"; break;
+        case 155: return "sched_getparam"; break;
+        case 156: return "sched_setscheduler"; break;
+        case 157: return "sched_getscheduler"; break;
+        case 158: return "sched_yield"; break;
+        case 159: return "sched_get_priority_max"; break;
+        case 160: return "sched_get_priority_min"; break;
+        case 161: return "sched_rr_get_interval"; break;
+        case 162: return "nanosleep"; break;
+        case 163: return "mremap"; break;
+        case 164: return "setresuid"; break;
+        case 165: return "getresuid"; break;
+        case 166: return "vm86"; break;
+        case 167: return "query_module"; break;
+        case 168: return "poll"; break;
+        case 169: return "nfsservctl"; break;
+        case 170: return "setresgid"; break;
+        case 171: return "getresgid"; break;
+        case 172: return "prctl"; break;
+        case 173: return "rt_sigreturn"; break;
+        case 174: return "rt_sigaction"; break;
+        case 175: return "rt_sigprocmask"; break;
+        case 176: return "rt_sigpending"; break;
+        case 177: return "rt_sigtimedwait"; break;
+        case 178: return "rt_sigqueueinfo"; break;
+        case 179: return "rt_sigsuspend"; break;
+        case 180: return "pread64"; break;
+        case 181: return "pwrite64"; break;
+        case 182: return "chown"; break;
+        case 183: return "getcwd"; break;
+        case 184: return "capget"; break;
+        case 185: return "capset"; break;
+        case 186: return "sigaltstack"; break;
+        case 187: return "sendfile"; break;
+        case 188: return "getpmsg"; break;
+        case 189: return "putpmsg"; break;
+        case 190: return "vfork"; break;
+        case 191: return "ugetrlimit"; break;
+        case 192: return "mmap2"; break;
+        case 193: return "truncate64"; break;
+        case 194: return "ftruncate64"; break;
+        case 195: return "stat64"; break;
+        case 196: return "lstat64"; break;
+        case 197: return "fstat64"; break;
+        case 198: return "lchown32"; break;
+        case 199: return "getuid32"; break;
+        case 200: return "getgid32"; break;
+        case 201: return "geteuid32"; break;
+        case 202: return "getegid32"; break;
+        case 203: return "setreuid32"; break;
+        case 204: return "setregid32"; break;
+        case 205: return "getgroups32"; break;
+        case 206: return "setgroups32"; break;
+        case 207: return "fchown32"; break;
+        case 208: return "setresuid32"; break;
+        case 209: return "getresuid32"; break;
+        case 210: return "setresgid32"; break;
+        case 211: return "getresgid32"; break;
+        case 212: return "chown32"; break;
+        case 213: return "setuid32"; break;
+        case 214: return "setgid32"; break;
+        case 215: return "setfsuid32"; break;
+        case 216: return "setfsgid32"; break;
+        case 217: return "pivot_root"; break;
+        case 218: return "mincore"; break;
+        case 219: return "madvise1"; break;
+        case 220: return "getdents64"; break;
+        case 221: return "fcntl64"; break;
+        case 224: return "gettid"; break;
+        case 225: return "readahead"; break;
+        case 226: return "setxattr"; break;
+        case 227: return "lsetxattr"; break;
+        case 228: return "fsetxattr"; break;
+        case 229: return "getxattr"; break;
+        case 230: return "lgetxattr"; break;
+        case 231: return "fgetxattr"; break;
+        case 232: return "listxattr"; break;
+        case 233: return "llistxattr"; break;
+        case 234: return "flistxattr"; break;
+        case 235: return "removexattr"; break;
+        case 236: return "lremovexattr"; break;
+        case 237: return "fremovexattr"; break;
+        case 238: return "tkill"; break;
+        case 239: return "sendfile64"; break;
+        case 240: return "futex"; break;
+        case 241: return "sched_setaffinity"; break;
+        case 242: return "sched_getaffinity"; break;
+        case 243: return "set_thread_area"; break;
+        case 244: return "get_thread_area"; break;
+        case 245: return "io_setup"; break;
+        case 246: return "io_destroy"; break;
+        case 247: return "io_getevents"; break;
+        case 248: return "io_submit"; break;
+        case 249: return "io_cancel"; break;
+        case 250: return "fadvise64"; break;
+        case 252: return "exit_group"; break;
+        case 253: return "lookup_dcookie"; break;
+        case 254: return "epoll_create"; break;
+        case 255: return "epoll_ctl"; break;
+        case 256: return "epoll_wait"; break;
+        case 257: return "remap_file_pages"; break;
+        case 258: return "set_tid_address"; break;
+        case 259: return "timer_create"; break;
+        case 260: return "timer_settime"; break;
+        case 261: return "timer_gettime"; break;
+        case 262: return "timer_getoverrun"; break;
+        case 263: return "timer_delete"; break;
+        case 264: return "clock_settime"; break;
+        case 265: return "clock_gettime"; break;
+        case 266: return "clock_getres"; break;
+        case 267: return "clock_nanosleep"; break;
+        case 268: return "statfs64"; break;
+        case 269: return "fstatfs64"; break;
+        case 270: return "tgkill"; break;
+        case 271: return "utimes"; break;
+        case 272: return "fadvise64_64"; break;
+        case 273: return "vserver"; break;
+        case 274: return "mbind"; break;
+        case 275: return "get_mempolicy"; break;
+        case 276: return "set_mempolicy"; break;
+        case 277: return "mq_open"; break;
+        case 278: return "mq_unlink"; break;
+        case 279: return "mq_timedsend"; break;
+        case 280: return "mq_timedreceive"; break;
+        case 281: return "mq_notify"; break;
+        case 282: return "mq_getsetattr"; break;
+        case 283: return "kexec_load"; break;
+        case 284: return "waitid"; break;
+        case 285: return "sys_setaltroot"; break;
+        case 286: return "add_key"; break;
+        case 287: return "request_key"; break;
+        case 288: return "keyctl"; break;
+        case 289: return "ioprio_set"; break;
+        case 290: return "ioprio_get"; break;
+        case 291: return "inotify_init"; break;
+        case 292: return "inotify_add_watch"; break;
+        case 293: return "inotify_rm_watch"; break;
+        case 294: return "migrate_pages"; break;
+        case 295: return "openat"; break;
+        case 296: return "mkdirat"; break;
+        case 297: return "mknodat"; break;
+        case 298: return "fchownat"; break;
+        case 299: return "futimesat"; break;
+        case 300: return "fstatat64"; break;
+        case 301: return "unlinkat"; break;
+        case 302: return "renameat"; break;
+        case 303: return "linkat"; break;
+        case 304: return "symlinkat"; break;
+        case 305: return "readlinkat"; break;
+        case 306: return "fchmodat"; break;
+        case 307: return "faccessat"; break;
+        case 308: return "pselect6"; break;
+        case 309: return "ppoll"; break;
+        case 310: return "unshare"; break;
+        case 311: return "set_robust_list"; break;
+        case 312: return "get_robust_list"; break;
+        case 313: return "splice"; break;
+        case 314: return "sync_file_range"; break;
+        case 315: return "tee"; break;
+        case 316: return "vmsplice"; break;
+        case 317: return "move_pages"; break;
+        case 318: return "getcpu"; break;
+        case 319: return "epoll_pwait"; break;
+        case 320: return "utimensat"; break;
+        case 321: return "signalfd"; break;
+        case 322: return "timerfd_create"; break;
+        case 323: return "eventfd"; break;
+        case 324: return "fallocate"; break;
+        case 325: return "timerfd_settime"; break;
+        case 326: return "timerfd_gettime"; break;
+        case 327: return "signalfd4"; break;
+        case 328: return "eventfd2"; break;
+        case 329: return "epoll_create1"; break;
+        case 330: return "dup3"; break;
+        case 331: return "pipe2"; break;
+        case 332: return "inotify_init1"; break;
+        case 333: return "preadv"; break;
+        case 334: return "pwritev"; break;
+        case 335: return "rt_tgsigqueueinfo"; break;
+        case 336: return "perf_event_open"; break;
+        default: return "UNKNOWN";  break; 
+    }
+}
+
+
+char * get_linux_syscall_name64 (uint_t syscall_nr) { 
+
+    switch (syscall_nr) { 
+
+        case 0: return "read"; break;
+        case 1: return "write"; break;
+        case 2: return "open"; break;
+        case 3: return "close"; break;
+        case 4: return "stat"; break;
+        case 5: return "fstat"; break;
+        case 6: return "lstat"; break;
+        case 7: return "poll"; break;
+        case 8: return "lseek"; break;
+        case 9: return "mmap"; break;
+        case 10: return "mprotect"; break;
+        case 11: return "munmap"; break;
+        case 12: return "brk"; break;
+        case 13: return "rt_sigaction"; break;
+        case 14: return "rt_sigprocmask"; break;
+        case 15: return "rt_sigreturn"; break;
+        case 16: return "ioctl"; break;
+        case 17: return "pread64"; break;
+        case 18: return "pwrite64"; break;
+        case 19: return "readv"; break;
+        case 20: return "writev"; break;
+        case 21: return "access"; break;
+        case 22: return "pipe"; break;
+        case 23: return "select"; break;
+        case 24: return "sched_yield"; break;
+        case 25: return "mremap"; break;
+        case 26: return "msync"; break;
+        case 27: return "mincore"; break;
+        case 28: return "madvise"; break;
+        case 29: return "shmget"; break;
+        case 30: return "shmat"; break;
+        case 31: return "shmctl"; break;
+        case 32: return "dup"; break;
+        case 33: return "dup2"; break;
+        case 34: return "pause"; break;
+        case 35: return "nanosleep"; break;
+        case 36: return "getitimer"; break;
+        case 37: return "alarm"; break;
+        case 38: return "setitimer"; break;
+        case 39: return "getpid"; break;
+        case 40: return "sendfile"; break;
+        case 41: return "socket"; break;
+        case 42: return "connect"; break;
+        case 43: return "accept"; break;
+        case 44: return "sendto"; break;
+        case 45: return "recvfrom"; break;
+        case 46: return "sendmsg"; break;
+        case 47: return "recvmsg"; break;
+        case 48: return "shutdown"; break;
+        case 49: return "bind"; break;
+        case 50: return "listen"; break;
+        case 51: return "getsockname"; break;
+        case 52: return "getpeername"; break;
+        case 53: return "socketpair"; break;
+        case 54: return "setsockopt"; break;
+        case 55: return "getsockopt"; break;
+        case 56: return "clone"; break;
+        case 57: return "fork"; break;
+        case 58: return "vfork"; break;
+        case 59: return "execve"; break;
+        case 60: return "exit"; break;
+        case 61: return "wait4"; break;
+        case 62: return "kill"; break;
+        case 63: return "uname"; break;
+        case 64: return "semget"; break;
+        case 65: return "semop"; break;
+        case 66: return "semctl"; break;
+        case 67: return "shmdt"; break;
+        case 68: return "msgget"; break;
+        case 69: return "msgsnd"; break;
+        case 70: return "msgrcv"; break;
+        case 71: return "msgctl"; break;
+        case 72: return "fcntl"; break;
+        case 73: return "flock"; break;
+        case 74: return "fsync"; break;
+        case 75: return "fdatasync"; break;
+        case 76: return "truncate"; break;
+        case 77: return "ftruncate"; break;
+        case 78: return "getdents"; break;
+        case 79: return "getcwd"; break;
+        case 80: return "chdir"; break;
+        case 81: return "fchdir"; break;
+        case 82: return "rename"; break;
+        case 83: return "mkdir"; break;
+        case 84: return "rmdir"; break;
+        case 85: return "creat"; break;
+        case 86: return "link"; break;
+        case 87: return "unlink"; break;
+        case 88: return "symlink"; break;
+        case 89: return "readlink"; break;
+        case 90: return "chmod"; break;
+        case 91: return "fchmod"; break;
+        case 92: return "chown"; break;
+        case 93: return "fchown"; break;
+        case 94: return "lchown"; break;
+        case 95: return "umask"; break;
+        case 96: return "gettimeofday"; break;
+        case 97: return "getrlimit"; break;
+        case 98: return "getrusage"; break;
+        case 99: return "sysinfo"; break;
+        case 100: return "times"; break;
+        case 101: return "ptrace"; break;
+        case 102: return "getuid"; break;
+        case 103: return "syslog"; break;
+        case 104: return "getgid"; break;
+        case 105: return "setuid"; break;
+        case 106: return "setgid"; break;
+        case 107: return "geteuid"; break;
+        case 108: return "getegid"; break;
+        case 109: return "setpgid"; break;
+        case 110: return "getppid"; break;
+        case 111: return "getpgrp"; break;
+        case 112: return "setsid"; break;
+        case 113: return "setreuid"; break;
+        case 114: return "setregid"; break;
+        case 115: return "getgroups"; break;
+        case 116: return "setgroups"; break;
+        case 117: return "setresuid"; break;
+        case 118: return "getresuid"; break;
+        case 119: return "setresgid"; break;
+        case 120: return "getresgid"; break;
+        case 121: return "getpgid"; break;
+        case 122: return "setfsuid"; break;
+        case 123: return "setfsgid"; break;
+        case 124: return "getsid"; break;
+        case 125: return "capget"; break;
+        case 126: return "capset"; break;
+        case 127: return "rt_sigpending"; break;
+        case 128: return "rt_sigtimedwait"; break;
+        case 129: return "rt_sigqueueinfo"; break;
+        case 130: return "rt_sigsuspend"; break;
+        case 131: return "sigaltstack"; break;
+        case 132: return "utime"; break;
+        case 133: return "mknod"; break;
+        case 134: return "uselib"; break;
+        case 135: return "personality"; break;
+        case 136: return "ustat"; break;
+        case 137: return "statfs"; break;
+        case 138: return "fstatfs"; break;
+        case 139: return "sysfs"; break;
+        case 140: return "getpriority"; break;
+        case 141: return "setpriority"; break;
+        case 142: return "sched_setparam"; break;
+        case 143: return "sched_getparam"; break;
+        case 144: return "sched_setscheduler"; break;
+        case 145: return "sched_getscheduler"; break;
+        case 146: return "sched_get_priority_max"; break;
+        case 147: return "sched_get_priority_min"; break;
+        case 148: return "sched_rr_get_interval"; break;
+        case 149: return "mlock"; break;
+        case 150: return "munlock"; break;
+        case 151: return "mlockall"; break;
+        case 152: return "munlockall"; break;
+        case 153: return "vhangup"; break;
+        case 154: return "modify_ldt"; break;
+        case 155: return "pivot_root"; break;
+        case 156: return "_sysctl"; break;
+        case 157: return "prctl"; break;
+        case 158: return "arch_prctl"; break;
+        case 159: return "adjtimex"; break;
+        case 160: return "setrlimit"; break;
+        case 161: return "chroot"; break;
+        case 162: return "sync"; break;
+        case 163: return "acct"; break;
+        case 164: return "settimeofday"; break;
+        case 165: return "mount"; break;
+        case 166: return "umount2"; break;
+        case 167: return "swapon"; break;
+        case 168: return "swapoff"; break;
+        case 169: return "reboot"; break;
+        case 170: return "sethostname"; break;
+        case 171: return "setdomainname"; break;
+        case 172: return "iopl"; break;
+        case 173: return "ioperm"; break;
+        case 174: return "create_module"; break;
+        case 175: return "init_module"; break;
+        case 176: return "delete_module"; break;
+        case 177: return "get_kernel_syms"; break;
+        case 178: return "query_module"; break;
+        case 179: return "quotactl"; break;
+        case 180: return "nfsservctl"; break;
+        case 181: return "getpmsg"; break;
+        case 182: return "putpmsg"; break;
+        case 183: return "afs_syscall"; break;
+        case 184: return "tuxcall"; break;
+        case 185: return "security"; break;
+        case 186: return "gettid"; break;
+        case 187: return "readahead"; break;
+        case 188: return "setxattr"; break;
+        case 189: return "lsetxattr"; break;
+        case 190: return "fsetxattr"; break;
+        case 191: return "getxattr"; break;
+        case 192: return "lgetxattr"; break;
+        case 193: return "fgetxattr"; break;
+        case 194: return "listxattr"; break;
+        case 195: return "llistxattr"; break;
+        case 196: return "flistxattr"; break;
+        case 197: return "removexattr"; break;
+        case 198: return "lremovexattr"; break;
+        case 199: return "fremovexattr"; break;
+        case 200: return "tkill"; break;
+        case 201: return "time"; break;
+        case 202: return "futex"; break;
+        case 203: return "sched_setaffinity"; break;
+        case 204: return "sched_getaffinity"; break;
+        case 205: return "set_thread_area"; break;
+        case 206: return "io_setup"; break;
+        case 207: return "io_destroy"; break;
+        case 208: return "io_getevents"; break;
+        case 209: return "io_submit"; break;
+        case 210: return "io_cancel"; break;
+        case 211: return "get_thread_area"; break;
+        case 212: return "lookup_dcookie"; break;
+        case 213: return "epoll_create"; break;
+        case 214: return "epoll_ctl_old"; break;
+        case 215: return "epoll_wait_old"; break;
+        case 216: return "remap_file_pages"; break;
+        case 217: return "getdents64"; break;
+        case 218: return "set_tid_address"; break;
+        case 219: return "restart_syscall"; break;
+        case 220: return "semtimedop"; break;
+        case 221: return "fadvise64"; break;
+        case 222: return "timer_create"; break;
+        case 223: return "timer_settime"; break;
+        case 224: return "timer_gettime"; break;
+        case 225: return "timer_getoverrun"; break;
+        case 226: return "timer_delete"; break;
+        case 227: return "clock_settime"; break;
+        case 228: return "clock_gettime"; break;
+        case 229: return "clock_getres"; break;
+        case 230: return "clock_nanosleep"; break;
+        case 231: return "exit_group"; break;
+        case 232: return "epoll_wait"; break;
+        case 233: return "epoll_ctl"; break;
+        case 234: return "tgkill"; break;
+        case 235: return "utimes"; break;
+        case 236: return "vserver"; break;
+        case 237: return "mbind"; break;
+        case 238: return "set_mempolicy"; break;
+        case 239: return "get_mempolicy"; break;
+        case 240: return "mq_open"; break;
+        case 241: return "mq_unlink"; break;
+        case 242: return "mq_timedsend"; break;
+        case 243: return "mq_timedreceive"; break;
+        case 244: return "mq_notify"; break;
+        case 245: return "mq_getsetattr"; break;
+        case 246: return "kexec_load"; break;
+        case 247: return "waitid"; break;
+        case 248: return "add_key"; break;
+        case 249: return "request_key"; break;
+        case 250: return "keyctl"; break;
+        case 251: return "ioprio_set"; break;
+        case 252: return "ioprio_get"; break;
+        case 253: return "inotify_init"; break;
+        case 254: return "inotify_add_watch"; break;
+        case 255: return "inotify_rm_watch"; break;
+        case 256: return "migrate_pages"; break;
+        case 257: return "openat"; break;
+        case 258: return "mkdirat"; break;
+        case 259: return "mknodat"; break;
+        case 260: return "fchownat"; break;
+        case 261: return "futimesat"; break;
+        case 262: return "newfstatat"; break;
+        case 263: return "unlinkat"; break;
+        case 264: return "renameat"; break;
+        case 265: return "linkat"; break;
+        case 266: return "symlinkat"; break;
+        case 267: return "readlinkat"; break;
+        case 268: return "fchmodat"; break;
+        case 269: return "faccessat"; break;
+        case 270: return "pselect6"; break;
+        case 271: return "ppoll"; break;
+        case 272: return "unshare"; break;
+        case 273: return "set_robust_list"; break;
+        case 274: return "get_robust_list"; break;
+        case 275: return "splice"; break;
+        case 276: return "tee"; break;
+        case 277: return "sync_file_range"; break;
+        case 278: return "vmsplice"; break;
+        case 279: return "move_pages"; break;
+        case 280: return "utimensat"; break;
+        case 281: return "epoll_pwait"; break;
+        case 282: return "signalfd"; break;
+        case 283: return "timerfd_create"; break;
+        case 284: return "eventfd"; break;
+        case 285: return "fallocate"; break;
+        case 286: return "timerfd_settime"; break;
+        case 287: return "timerfd_gettime"; break;
+        case 288: return "accept4"; break;
+        case 289: return "signalfd4"; break;
+        case 290: return "eventfd2"; break;
+        case 291: return "epoll_create1"; break;
+        case 292: return "dup3"; break;
+        case 293: return "pipe2"; break;
+        case 294: return "inotify_init1"; break;
+        case 295: return "preadv"; break;
+        case 296: return "pwritev"; break;
+        case 297: return "rt_tgsigqueueinfo"; break;
+        case 298: return "perf_event_open"; break;
+        default: return "UNKNOWN";  break; 
+    }
+}
diff --git a/palacios/src/extensions/ext_mpi_accel.c b/palacios/src/extensions/ext_mpi_accel.c
new file mode 100644
index 0000000..24326ef
--- /dev/null
+++ b/palacios/src/extensions/ext_mpi_accel.c
@@ -0,0 +1,64 @@
+/* 
+ * This file is part of the Palacios Virtual Machine Monitor developed
+ * by the V3VEE Project with funding from the United States National 
+ * Science Foundation and the Department of Energy.  
+ *
+ * The V3VEE Project is a joint project between Northwestern University
+ * and the University of New Mexico.  You can find out more at 
+ * http://www.v3vee.org
+ *
+ * Copyright (c) 2011, Kyle C. Hale <kh@u.norhtwestern.edu>
+ * Copyright (c) 2011, The V3VEE Project <http://www.v3vee.org> 
+ * All rights reserved.
+ *
+ * Author: Kyle C. Hale <kh@u.northwestern.edu>
+ *
+ * This is free software.  You are permitted to use,
+ * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
+ */
+
+
+#include <palacios/vmm.h>
+#include <palacios/vm_guest.h>
+#include <palacios/vmm_intr.h>
+#include <palacios/vmm_syscall_hijack.h>
+#include <palacios/vmm_mpi_accel.h>
+#include <palacios/vmm_process_environment.h>
+#include <palacios/vmm_execve_hook.h>
+
+
+int v3_init_mpi_accel (struct guest_info * core) {
+    //binfile = "./envtest";
+    //args[1] = "LD_PRELOAD=./libcwrap.so";
+
+    v3_hook_swintr(core, 0x80, v3_syscall_handler, NULL);
+    v3_hook_syscall(core, 11, v3_sysexecve_handler, NULL);
+    v3_hook_executable(core, "./envtest", v3_mpi_preload_handler, NULL);
+
+    return 0;
+}
+
+
+int v3_deinit_mpi_accel (struct guest_info * core) {
+
+    return 0;
+}
+
+
+int v3_mpi_preload_handler (struct guest_info * core, void * priv_data) {
+
+    char * a[3];
+    a[0] = "TEST=HITHERE";
+    a[1] = "TEST2=/blah/blah/blah";
+    a[2] = "LD_PRELOAD=./libcwrap.so";
+
+    int ret = v3_inject_strings(core, (const char**)NULL, (const char**)a, 0, 3);
+    if (ret == -1) {
+        PrintDebug("Error injecting strings in execve handler\n");
+        return -1;
+    }
+
+    return 0;
+}
+
+
diff --git a/palacios/src/extensions/ext_process_environment.c b/palacios/src/extensions/ext_process_environment.c
new file mode 100644
index 0000000..15f04a0
--- /dev/null
+++ b/palacios/src/extensions/ext_process_environment.c
@@ -0,0 +1,589 @@
+/* 
+ * This file is part of the Palacios Virtual Machine Monitor developed
+ * by the V3VEE Project with funding from the United States National 
+ * Science Foundation and the Department of Energy.  
+ *
+ * The V3VEE Project is a joint project between Northwestern University
+ * and the University of New Mexico.  You can find out more at 
+ * http://www.v3vee.org
+ *
+ * Copyright (c) 2011, Kyle C. Hale <kh@u.norhtwestern.edu>
+ * Copyright (c) 2011, The V3VEE Project <http://www.v3vee.org> 
+ * All rights reserved.
+ *
+ * Author: Kyle C. Hale <kh@u.northwestern.edu>
+ *
+ * This is free software.  You are permitted to use,
+ * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
+ */
+
+#include <palacios/vmm.h>
+#include <palacios/vmm_decoder.h>
+#include <palacios/vmm_process_environment.h>
+#include <palacios/vm_guest.h>
+#include <palacios/vm_guest_mem.h>
+
+static int v3_copy_chunk_guest32(struct guest_info * core, addr_t gva, uint_t argcnt, uint_t envcnt) {
+
+    int ret = 0, i = 0;
+    addr_t hva;
+    uint32_t tmp_args[core->var_dump.argc];
+    uint32_t tmp_envs[core->var_dump.envc];
+
+    PrintDebug("Initiating copy into guest (32bit)\n");
+    
+    ret = v3_gva_to_hva(core, get_addr_linear(core, gva, &(core->segments.ds)), &hva);
+    if (ret == -1) {
+        PrintDebug("Error translating gva in v3_copy_chunk_2guest\n");
+        return -1;
+    }
+    
+    // copy the env strings (we're moving top-down through the stack)
+    char * host_cursor = (char*) hva;
+    uint32_t guest_cursor = (uint32_t) gva;
+    host_cursor -= strlen(core->var_dump.envp[i]) + 1;
+    guest_cursor -= strlen(core->var_dump.envp[i]) + 1;
+    while (i < core->var_dump.envc) {
+        //PrintDebug("Copying envvar#%d: %s\n", i, core->var_dump.envp[i]);
+        strcpy(host_cursor, core->var_dump.envp[i]);
+        tmp_envs[i] = guest_cursor;
+        i++;
+        if (i != core->var_dump.envc) { 
+            host_cursor -= strlen(core->var_dump.envp[i]) + 1;
+            guest_cursor -= strlen(core->var_dump.envp[i]) + 1;
+        }
+    }
+        
+    // then the arg strings
+    i = 0;
+    host_cursor -= strlen(core->var_dump.argv[i]) + 1;
+    guest_cursor -= strlen(core->var_dump.argv[i]) + 1;
+    while (i < core->var_dump.argc) {
+        //PrintDebug("Copying arg #%d: %s\n", i, core->var_dump.argv[i]);
+        strcpy(host_cursor, core->var_dump.argv[i]);
+        tmp_args[i] = guest_cursor;
+        i++;
+        if (i != core->var_dump.argc) {
+            host_cursor -= strlen(core->var_dump.argv[i]) + 1;
+            guest_cursor -= strlen(core->var_dump.argv[i]) + 1;
+        }
+    }
+
+    
+    // padding
+    host_cursor--;  
+    guest_cursor--;
+    while ((long)host_cursor % 4) {
+        *host_cursor = 0;
+        host_cursor--;
+        guest_cursor--;
+    }
+
+    // null ptr
+    host_cursor -= 4;
+    guest_cursor -= 4;
+    *((uint32_t*)host_cursor) = 0;
+
+    host_cursor -= 4;
+    guest_cursor -= 4;
+    for (i = 0; i < core->var_dump.envc; i++) {
+       *((uint32_t*)host_cursor) = tmp_envs[i];
+        host_cursor -= 4;
+        guest_cursor -= 4;
+    }
+
+    core->vm_regs.rdx = guest_cursor + 4;
+    
+    *((uint32_t*)host_cursor) = 0;
+    host_cursor -= 4;
+    guest_cursor -= 4;
+    for (i = 0; i < core->var_dump.argc; i++) {
+        *((uint32_t*)host_cursor) = tmp_args[i];
+        host_cursor -= 4;
+        guest_cursor -= 4;
+    }
+
+    core->vm_regs.rcx = guest_cursor + 4;
+
+    // free up our temporary storage in the VMM
+    for (i = 0; i < core->var_dump.argc; i++) {
+        V3_Free(core->var_dump.argv[i]);
+    }
+    for (i = 0; i < core->var_dump.envc; i++) {
+        V3_Free(core->var_dump.envp[i]);
+    }
+    
+    V3_Free(core->var_dump.envp);
+    V3_Free(core->var_dump.argv);
+    return 0;
+}
+
+
+static int v3_copy_chunk_vmm32(struct guest_info * core, const char ** argstrs, const char ** envstrs, uint_t argcnt, uint_t envcnt) {
+
+    addr_t envp, argv;
+    uint_t argc = 0, envc = 0, bytes = 0;
+    char * cursor;
+
+    PrintDebug("Initiating copy into vmm\n");
+
+    int ret = v3_gva_to_hva(core, get_addr_linear(core, core->vm_regs.rdx, &(core->segments.ds)), &envp);
+    if (ret == -1) {
+        PrintDebug("Error translating address in rdx\n");
+        return 0;
+    }
+
+    ret = v3_gva_to_hva(core, get_addr_linear(core, core->vm_regs.rcx, &(core->segments.ds)), &argv);
+    if (ret == -1) {
+        PrintDebug("Error translating address in rcx\n");
+        return 0;
+    }
+    
+    cursor = (char*)argv;
+    while (*((uint32_t*)cursor) != 0) {
+        addr_t argvn;
+        ret = v3_gva_to_hva(core, get_addr_linear(core, (addr_t)*((uint32_t*)cursor), &(core->segments.ds)), &argvn);
+        if (ret == -1) {
+            PrintDebug("Error translating address for argvn\n");
+        }
+        argc++;
+        cursor += 4;
+    } 
+
+    /* account for new args */
+    argc += argcnt;
+    core->var_dump.argv = (char**)V3_Malloc(sizeof(char*)*argc);
+    core->var_dump.argc = argc;
+    bytes += sizeof(uint32_t)*argc;
+
+    cursor = (char*)argv;
+    int i = 0;
+    while (*((uint32_t*)cursor) != 0) {
+        addr_t argvn;
+        ret = v3_gva_to_hva(core, get_addr_linear(core, (addr_t)*((uint32_t*)cursor), &(core->segments.ds)), &argvn);
+        if (ret == -1) {
+            PrintDebug("Error translating argvn address\n");
+        }
+    
+        /* malloc room for the string */
+        char * tmpstr = (char*)V3_Malloc(strlen((char*)argvn) + 1);
+
+        /* copy the pointer */
+        core->var_dump.argv[i] = tmpstr; 
+
+        /* copy the string */
+        strncpy(tmpstr, (char*)argvn, strlen((char*)argvn) + 1);
+        i++;
+        cursor += 4;
+        bytes += strlen((char*)argvn) + 1;
+    }
+
+    /* stick in new arg strings */
+    int j = 0;
+    while (j < argcnt) {
+        char * tmpstr = (char*)V3_Malloc(strlen(argstrs[j]) + 1);
+        strncpy(tmpstr, argstrs[i], strlen(argstrs[j]) + 1);
+        core->var_dump.argv[i] = tmpstr;
+        bytes += strlen(argstrs[j]) + 1;
+        i++; j++;
+    }
+        
+    
+    cursor = (char*)envp;
+    while (*((uint32_t*)cursor) != 0) {
+        addr_t envpn;
+        ret = v3_gva_to_hva(core, get_addr_linear(core, (addr_t)*((uint32_t*)cursor), &(core->segments.ds)), &envpn);
+        if (ret == -1) {
+            PrintDebug("Error translating address for envpn\n");
+        }
+        envc++;
+        cursor += 4;
+    } 
+
+    envc += envcnt;
+    core->var_dump.envp = (char**)V3_Malloc(sizeof(char*)*envc);
+    core->var_dump.envc = envc;
+    bytes += sizeof(uint32_t)*envc;
+
+    cursor = (char*)envp;
+    i = 0;
+    while (*((uint32_t*)cursor) != 0) {
+        addr_t envpn;
+        ret = v3_gva_to_hva(core, get_addr_linear(core, (addr_t)*((uint32_t*)cursor), &(core->segments.ds)), &envpn);
+        if (ret == -1) {
+            PrintDebug("Error translating address for envpn\n");
+        }
+        
+        /* malloc room for the string */
+        char * tmpstr = (char*)V3_Malloc(strlen((char*)envpn) + 1);
+        
+        /* copy the pointer */
+        core->var_dump.envp[i] = tmpstr;
+
+        /* deepcopy the string */
+        strncpy(tmpstr, (char*)envpn, strlen((char*)envpn) + 1);
+        i++;    
+        cursor += 4;
+        bytes += strlen((char*)envpn) + 1; 
+    }
+
+    /* put in our new env strings */
+    j = 0;
+    while (j < envcnt) {
+        char * tmpstr = (char*)V3_Malloc(strlen(envstrs[j]) + 1);
+        strncpy(tmpstr, envstrs[j], strlen(envstrs[j]) + 1);
+        core->var_dump.envp[i] = tmpstr;
+        bytes += strlen(envstrs[j]) + 1;
+        i++; j++;
+    }
+
+
+    /* account for padding for strings
+       and 2 null pointers */
+    bytes += (bytes % 4) + 8;
+    core->var_dump.bytes = bytes;
+    return bytes;
+}
+
+
+static int v3_inject_strings32 (struct guest_info * core, const char ** argstrs, const char ** envstrs, uint_t argcnt, uint_t envcnt) {
+
+    addr_t inject_gva;
+    uint_t bytes_needed = 0;
+
+    /* copy out all of the arguments and the environment to the VMM */
+    if ((bytes_needed = v3_copy_chunk_vmm32(core, argstrs, envstrs, argcnt, envcnt)) == -1) {
+        PrintDebug("Error copying out environment and arguments\n");
+        return -1;
+    }
+
+    PrintDebug("environment successfully copied into VMM\n");
+    
+    inject_gva = v3_prepare_guest_stack(core, bytes_needed);
+    if (!inject_gva) {
+        PrintDebug("Not enough space on user stack\n");
+        return -1;
+    }
+
+    v3_copy_chunk_guest32(core, inject_gva, argcnt, envcnt);
+
+    return 0;
+}
+
+
+static int v3_copy_chunk_guest64(struct guest_info * core, addr_t gva, uint_t argcnt, uint_t envcnt) {
+
+    int ret = 0, i = 0;
+    addr_t hva;
+    uint64_t tmp_args[core->var_dump.argc];
+    uint64_t tmp_envs[core->var_dump.envc];
+
+    PrintDebug("Initiating copy into guest (64bit)\n");
+    
+    ret = v3_gva_to_hva(core, get_addr_linear(core, gva, &(core->segments.ds)), &hva);
+    if (ret == -1) {
+        PrintDebug("Error translating gva in v3_copy_chunk_2guest64\n");
+        return -1;
+    }
+    
+    char * host_cursor = (char*) hva;
+    uint64_t guest_cursor = (uint64_t) gva;
+    host_cursor -= strlen(core->var_dump.envp[i]) + 1;
+    guest_cursor -= strlen(core->var_dump.envp[i]) + 1;
+    while (i < core->var_dump.envc) {
+        //PrintDebug("Copying envvar#%d: %s\n", i, core->var_dump.envp[i]);
+        strcpy(host_cursor, core->var_dump.envp[i]);
+        tmp_envs[i] = guest_cursor;
+        i++;
+        if (i != core->var_dump.envc) { 
+            host_cursor -= strlen(core->var_dump.envp[i]) + 1;
+            guest_cursor -= strlen(core->var_dump.envp[i]) + 1;
+        }
+    }
+        
+    i = 0;
+    host_cursor -= strlen(core->var_dump.argv[i]) + 1;
+    guest_cursor -= strlen(core->var_dump.argv[i]) + 1;
+    while (i < core->var_dump.argc) {
+        //PrintDebug("Copying arg #%d: %s\n", i, core->var_dump.argv[i]);
+        strcpy(host_cursor, core->var_dump.argv[i]);
+        tmp_args[i] = guest_cursor;
+        i++;
+        if (i != core->var_dump.argc) {
+            host_cursor -= strlen(core->var_dump.argv[i]) + 1;
+            guest_cursor -= strlen(core->var_dump.argv[i]) + 1;
+        }
+    }
+
+    // padding
+    host_cursor--;  
+    guest_cursor--;
+    while ((long)host_cursor % 8) {
+        *host_cursor = 0;
+        host_cursor--;
+        guest_cursor--;
+    }
+
+    // one null ptr
+    host_cursor -= 8;
+    guest_cursor -= 8;
+    *((uint64_t*)host_cursor) = 0;
+
+    host_cursor -= 8;
+    guest_cursor -= 8;
+    for (i = 0; i < core->var_dump.envc; i++) {
+       *((uint64_t*)host_cursor) = tmp_envs[i];
+        host_cursor -= 8;
+        guest_cursor -= 8;
+    }
+
+    core->vm_regs.rdx = guest_cursor + 8;
+
+    *((uint64_t*)host_cursor) = 0;
+    host_cursor -= 8;
+    guest_cursor -= 8;
+    for (i = 0; i < core->var_dump.argc; i++) {
+        *((uint64_t*)host_cursor) = tmp_args[i];
+        host_cursor -= 8;
+        guest_cursor -= 8;
+    }
+
+    core->vm_regs.rcx = guest_cursor + 8;
+
+    for (i = 0; i < core->var_dump.argc; i++) {
+        V3_Free(core->var_dump.argv[i]);
+    }
+    for (i = 0; i < core->var_dump.envc; i++) {
+        V3_Free(core->var_dump.envp[i]);
+    }
+    
+    V3_Free(core->var_dump.envp);
+    V3_Free(core->var_dump.argv);
+    return 0;
+}
+
+
+static int v3_copy_chunk_vmm64(struct guest_info * core, const char ** argstrs, const char ** envstrs, uint_t argcnt, uint_t envcnt) {
+
+    addr_t envp, argv;
+    uint_t argc = 0, envc = 0, bytes = 0;
+    char * cursor;
+
+    PrintDebug("Initiating copy into vmm\n");
+
+    int ret = v3_gva_to_hva(core, get_addr_linear(core, core->vm_regs.rdx, &(core->segments.ds)), &envp);
+    if (ret == -1) {
+        PrintDebug("Error translating address in rdx\n");
+        return 0;
+    }
+
+    ret = v3_gva_to_hva(core, get_addr_linear(core, core->vm_regs.rcx, &(core->segments.ds)), &argv);
+    if (ret == -1) {
+        PrintDebug("Error translating address in rcx\n");
+        return 0;
+    }
+    
+    cursor = (char*)argv;
+    while (*((uint64_t*)cursor) != 0) {
+        addr_t argvn;
+        ret = v3_gva_to_hva(core, get_addr_linear(core, (addr_t)*((uint64_t*)cursor), &(core->segments.ds)), &argvn);
+        if (ret == -1) {
+            PrintDebug("Error translating address for argvn\n");
+        }
+        argc++;
+        cursor += 8;
+    } 
+    
+    /* account for new strings */
+    argc += argcnt;
+    core->var_dump.argv = (char**)V3_Malloc(sizeof(char*)*argc);
+    core->var_dump.argc = argc;
+    bytes += sizeof(char*)*argc;
+
+    cursor = (char*)argv;
+    int i = 0;
+    while (*((uint64_t*)cursor) != 0) {
+        addr_t argvn;
+        ret = v3_gva_to_hva(core, get_addr_linear(core, (addr_t)*((uint64_t*)cursor), &(core->segments.ds)), &argvn);
+        if (ret == -1) {
+            PrintDebug("Error translating argvn address\n");
+        }
+    
+        /* malloc room for the string */
+        char * tmpstr = (char*)V3_Malloc(strlen((char*)argvn) + 1);
+
+        /* copy the pointer */
+        core->var_dump.argv[i] = tmpstr; 
+
+        /* copy the string */
+        strncpy(tmpstr, (char*)argvn, strlen((char*)argvn) + 1);
+        i++;
+        cursor += 8;
+        bytes += strlen((char*)argvn) + 1;
+    }
+        
+    /* stick in new arg strings */
+    int j = 0;
+    while (j < argcnt) {
+        char * tmpstr = (char*)V3_Malloc(strlen(argstrs[j]) + 1);
+        strncpy(tmpstr, argstrs[j], strlen(argstrs[j]) + 1);
+        core->var_dump.argv[i] = tmpstr;
+        bytes += strlen(argstrs[j]) + 1;
+        i++; j++;
+    }
+
+
+    cursor = (char*)envp;
+    while (*((uint64_t*)cursor) != 0) {
+        addr_t envpn;
+        ret = v3_gva_to_hva(core, get_addr_linear(core, (addr_t)*((uint64_t*)cursor), &(core->segments.ds)), &envpn);
+        if (ret == -1) {
+            PrintDebug("Error translating address for envpn\n");
+        }
+        envc++;
+        cursor += 8;
+    } 
+
+    envc += envcnt;
+    core->var_dump.envp = (char**)V3_Malloc(sizeof(char*)*envc);
+    core->var_dump.envc = envc;
+    bytes += sizeof(uint64_t)*(envc);
+
+
+    cursor = (char*)envp;
+    i = 0;
+    while (*((uint64_t*)cursor) != 0) {
+        addr_t envpn;
+        ret = v3_gva_to_hva(core, get_addr_linear(core, (addr_t)*((uint64_t*)cursor), &(core->segments.ds)), &envpn);
+        if (ret == -1) {
+            PrintDebug("Error translating address for envpn\n");
+        }
+        
+        /* malloc room for the string */
+        char * tmpstr = (char*)V3_Malloc(strlen((char*)envpn) + 1);
+        
+        /* copy the pointer */
+        core->var_dump.envp[i] = tmpstr;
+
+        /* deepcopy the string */
+        strncpy(tmpstr, (char*)envpn, strlen((char*)envpn) + 1);
+        i++;    
+        cursor += 8;
+        bytes += strlen((char*)envpn) + 1; 
+    }
+
+    /* stick in new env strings */
+    j = 0;
+    while (j < envcnt) {
+        char * tmpstr = (char*)V3_Malloc(strlen(envstrs[j]) + 1);
+        strncpy(tmpstr, envstrs[i], strlen(envstrs[j]) + 1);
+        core->var_dump.envp[i] = tmpstr;
+        bytes += strlen(envstrs[j]) + 1;
+        i++; j++;
+    } 
+
+
+    /* account for padding for strings
+       and 2 null pointers */
+    bytes += (bytes % 8) + 16;
+    core->var_dump.bytes = bytes;
+    return bytes;
+}
+
+
+static int v3_inject_strings64 (struct guest_info * core, const char ** argstrs, const char ** envstrs, uint_t argcnt, uint_t envcnt) {
+
+    addr_t inject_gva;
+    uint_t bytes_needed = 0;
+
+    /* copy out all of the arguments and the environment to the VMM */
+    if ((bytes_needed = v3_copy_chunk_vmm64(core, argstrs, envstrs, argcnt, envcnt)) == -1) {
+        PrintDebug("Error copying out environment and arguments\n");
+        return -1;
+    }
+
+    PrintDebug("environment successfully copied into VMM\n");
+    
+    inject_gva = v3_prepare_guest_stack(core, bytes_needed);
+    if (!inject_gva) {
+        PrintDebug("Not enough space on user stack\n");
+        return -1;
+    }
+
+    v3_copy_chunk_guest64(core, inject_gva, argcnt, envcnt);
+    return 0;
+}
+
+
+addr_t v3_prepare_guest_stack (struct guest_info * core, uint_t bytes_needed) {
+
+    /* TODO: check if we've injected a page fault to get more stack space */
+
+    // do we have enough room between esp and the next page boundary?
+    uint_t rem_bytes = 4096 - (core->vm_regs.rsp % 4096);
+
+    if (rem_bytes >= bytes_needed) {
+        return (addr_t)core->vm_regs.rsp;
+    } else {
+        // not enough room, find out how many pages we need (ceiling)
+        uint_t num_pages = (bytes_needed + 4095) / 4096;
+        
+        // check if num_pages are user & writable
+        int i = 0;
+        int pages_ok = 1;
+        addr_t gva = core->vm_regs.rsp + rem_bytes;
+        for (; i < num_pages; i++, gva -= 4096) {
+            if (!v3_gva_can_access(core, gva)) {
+                pages_ok = 0;
+            }
+        }
+
+        if (pages_ok) {
+            return (addr_t)core->vm_regs.rsp;
+        } else {
+    
+            /*
+            // inject a page fault
+            pf_error_t fault_type = {
+                .write = 1,
+                .user = 1
+            };
+
+            // hoping Linux will allocate all pages in between gva and esp 
+            v3_inject_guest_pf(core, gva - (num_pages*4096), fault_type);
+            */
+            return -1;
+        }
+    }
+}
+
+
+/* TODO: give these next to functions the ability to copy into guest stack */
+int v3_replace_arg (struct guest_info * core, uint_t argnum, const char * newval) { 
+
+    return 0;
+}
+
+
+int v3_replace_env (struct guest_info * core, const char * envname, const char * newval) {
+
+    return 0;
+}
+
+
+int v3_inject_strings (struct guest_info * core, const char ** argstrs, const char ** envstrs, uint_t argcnt, uint_t envcnt) {
+    
+    if (core->cpu_mode == LONG || core->cpu_mode == LONG_32_COMPAT) {
+        if (v3_inject_strings64(core, argstrs, envstrs, argcnt, envcnt) == -1) {
+            PrintDebug("Error injecting strings into environment (64)\n");
+            return -1;
+        }
+    } else {
+        if (v3_inject_strings32(core, argstrs, envstrs, argcnt, envcnt) == -1) {
+            PrintDebug("Error injecting strings into environment (32)\n");
+            return -1;
+        }
+    }
+
+    return 0;
+}
diff --git a/palacios/src/extensions/ext_syscall_hijack.c b/palacios/src/extensions/ext_syscall_hijack.c
new file mode 100644
index 0000000..31445df
--- /dev/null
+++ b/palacios/src/extensions/ext_syscall_hijack.c
@@ -0,0 +1,191 @@
+/* 
+ * This file is part of the Palacios Virtual Machine Monitor developed
+ * by the V3VEE Project with funding from the United States National 
+ * Science Foundation and the Department of Energy.  
+ *
+ * The V3VEE Project is a joint project between Northwestern University
+ * and the University of New Mexico.  You can find out more at 
+ * http://www.v3vee.org
+ *
+ * Copyright (c) 2011, Kyle C. Hale <kh@u.norhtwestern.edu>
+ * Copyright (c) 2011, The V3VEE Project <http://www.v3vee.org> 
+ * All rights reserved.
+ *
+ * Author: Kyle C. Hale <kh@u.northwestern.edu>
+ *
+ * This is free software.  You are permitted to use,
+ * redistribute, and modify it as specified in the file "V3VEE_LICENSE".
+ */
+
+#include <palacios/vmm.h>
+#include <palacios/vm_guest_mem.h>
+#include <palacios/vm_guest.h>
+#include <palacios/vmm_intr.h>
+#include <palacios/vmm_decoder.h>
+#include <palacios/vmm_string.h>
+#include <palacios/vmm_shadow_paging.h>
+#include <palacios/vmm_syscall_hijack.h>
+#include <palacios/vmm_linux_syscall_map.h>
+#include <palacios/vmm_process_environment.h>
+#include <palacios/vmm_execve_hook.h>
+
+
+#ifndef CONFIG_DEBUG_SYSCALL_HIJACK
+#undef PrintDebug
+#define PrintDebug(fmt, args...)
+#endif
+
+#define MAX_CHARS 256
+#ifndef max
+    #define max(a, b) ( ((a) > (b)) ? (a) : (b) )
+#endif
+
+
+
+static void print_arg (struct  guest_info * core, v3_reg_t reg, uint8_t argnum) {
+
+    addr_t hva;
+    int ret = 0;
+    
+    PrintDebug("\t ARG%d: INT - %ld\n", argnum, (long) reg);
+
+    if (core->mem_mode == PHYSICAL_MEM) {
+        ret = v3_gpa_to_hva(core, get_addr_linear(core, reg, &(core->segments.ds)), &hva);
+    }
+    else { 
+        ret = v3_gva_to_hva(core, get_addr_linear(core, reg, &(core->segments.ds)), &hva);
+    }
+
+    PrintDebug("\t       STR - ");
+    if (ret == -1) {
+        PrintDebug("\n");
+        return;
+    }
+        
+    uint32_t c = max(MAX_CHARS, 4096 - (hva % 4096));
+    int i = 0;
+    for (; i < c && *((char*)(hva + i)) != 0; i++) {
+        PrintDebug("%c", *((char*)(hva + i)));
+    }
+    PrintDebug("\n");
+}
+
+
+static void print_syscall (uint8_t is64, struct guest_info * core) {
+
+    if (is64) {
+        PrintDebug("Syscall #%ld: \"%s\"\n", (long)core->vm_regs.rax, get_linux_syscall_name64(core->vm_regs.rax));
+    } else {
+        PrintDebug("Syscall #%ld: \"%s\"\n", (long)core->vm_regs.rax, get_linux_syscall_name32(core->vm_regs.rax));
+    }
+
+    print_arg(core, core->vm_regs.rbx, 1);
+    print_arg(core, core->vm_regs.rcx, 2);
+    print_arg(core, core->vm_regs.rdx, 3);
+}
+
+
+int v3_syscall_handler (struct guest_info * core, uint8_t vector, void * priv_data) {
+ 
+    uint_t syscall_nr = (uint_t) core->vm_regs.rax;
+    int err = 0;
+
+    struct v3_syscall_hook * hook = core->sc_hook_map.syscall_hooks[syscall_nr];
+    if (hook == NULL) {
+#ifdef CONFIG_SYSCALL_PASSTHROUGH
+        if (v3_hook_passthrough_syscall(core, syscall_nr) == -1) {
+            PrintDebug("Error hooking passthrough syscall\n");
+            return -1;
+        }
+        hook = core->sc_hook_map.syscall_hooks[syscall_nr];
+#else
+        return v3_signal_swintr(core, vector);
+#endif
+    }
+    
+    err = hook->handler(core, syscall_nr, hook->priv_data);
+    if (err == -1) {
+        PrintDebug("V3 Syscall Handler: Error in syscall hook\n");
+        return -1;
+    }
+
+    return 0;
+}
+
+
+static inline struct v3_syscall_hook * get_syscall_hook (struct guest_info * core, uint_t syscall_nr) {
+    return core->sc_hook_map.syscall_hooks[syscall_nr];
+} 
+
+
+int v3_hook_syscall (struct guest_info * core,
+    uint_t syscall_nr,
+    int (*handler)(struct guest_info * core, uint_t syscall_nr, void * priv_data),
+    void * priv_data) 
+{
+    struct v3_syscall_hook * hook = (struct v3_syscall_hook *)V3_Malloc(sizeof(struct v3_syscall_hook));
+
+    
+    if (hook == NULL) {
+        return -1;
+    }
+
+    if (get_syscall_hook(core, syscall_nr) != NULL) {
+        PrintError("System Call #%d already hooked\n", syscall_nr);
+        return -1;
+    }
+
+    hook->handler = handler;
+    hook->priv_data = priv_data;
+
+    core->sc_hook_map.syscall_hooks[syscall_nr] = hook;
+
+    return 0;
+}
+
+
+static int passthrough_syscall_handler (struct guest_info * core, uint_t syscall_nr, void * priv_data) {
+    print_syscall(0, core);
+    return 0;
+}
+
+
+int v3_hook_passthrough_syscall (struct guest_info * core, uint_t syscall_nr) {
+    
+    int rc = v3_hook_syscall(core, syscall_nr, passthrough_syscall_handler, NULL);
+
+    if (rc) {
+        PrintError("failed to hook syscall 0x%x for passthrough (guest=0x%p)\n", syscall_nr, (void *)core);
+        return -1;
+    } else {
+        PrintDebug("hooked syscall 0x%x for passthrough (guest=0x%p)\n", syscall_nr, (void *)core);
+        return 0;
+    }
+
+    /* shouldn't get here */
+    return 0;
+}
+
+
+int v3_sysexecve_handler (struct guest_info * core, uint_t syscall_nr, void * priv_data) {
+    addr_t hva, key;
+    struct exec_hook * hook;
+    int ret;
+    
+    ret = v3_gva_to_hva(core, get_addr_linear(core, (addr_t)core->vm_regs.rbx, &(core->segments.ds)), &hva);
+    if (ret == -1) {
+        PrintDebug("Error translating file path in sysexecve handler\n");
+        return -1;
+    }
+
+    key = v3_hash_buffer((uchar_t*)hva, strlen((uchar_t*)hva));
+    if ((hook = (struct exec_hook*)v3_htable_search(core->exec_hooks.bin_table, key)) != NULL) {
+       if (hook->handler(core, NULL) == -1) {
+            PrintDebug("Error handling execve hook\n");
+            return -1;
+        }
+    } 
+        
+    return 0;
+}
+