Added user-space utilities for controlling the selective syscall exiting utility

diff --git a/linux_usr/Makefile b/linux_usr/Makefile
index f69af46..232ee09 100644 (file)
--- a/linux_usr/Makefile
+++ b/linux_usr/Makefile
@@ -40,7 +40,8 @@ EXAMPLE_EXECS = v3_user_host_dev_example \
 EXPERIMENTAL_EXECS =   v3_simulate  \
                        v3_inject_ecc_scrubber_mce  \
                         v3_top_inject \
-                        v3_env_inject 
+                        v3_env_inject \
+                                               v3_syscall
 
 
 

diff --git a/linux_usr/v3_syscall.c b/linux_usr/v3_syscall.c
new file mode 100644 (file)
index 0000000..5127219
--- /dev/null
+++ b/linux_usr/v3_syscall.c
@@ -0,0 +1,85 @@
+/*
+ * V3 Selective System Call Exiting Control
+ * (c) Kyle C. Hale, 2012
+ *
+ */
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/ioctl.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+
+#include "iface-syscall.h"
+
+#define CMD_MAX 10
+#define SYSCALL_MAX 256
+
+static void usage () {
+       fprintf(stderr, "\nUsage: v3_syscall <vm device> <syscall_nr> <on|off|status>\n");
+       exit(0);
+}
+
+
+int main (int argc, char * argv[]) {
+
+       int vm_fd, ret, syscall_nr;
+       char * vm_dev = NULL;
+       struct v3_syscall_cmd syscall_cmd;
+
+       if (argc < 4 || argc > 4) {
+               fprintf(stderr, "Invalid number of arguments.\n");
+               usage();
+       }
+
+       vm_dev = argv[1];
+       syscall_nr = strtol(argv[2], NULL, 0);
+
+       if (strncmp(argv[3], "on", CMD_MAX) == 0) {
+               syscall_cmd.cmd = SYSCALL_ON;
+       } else if (strncmp(argv[3], "off", CMD_MAX) == 0) {
+               syscall_cmd.cmd = SYSCALL_OFF;
+       } else if (strncmp(argv[3], "status", CMD_MAX) == 0) {
+               syscall_cmd.cmd = SYSCALL_STAT;
+       } else {
+               fprintf(stderr, "Invalid command.\n");
+               usage();
+       }
+
+    if (syscall_nr < 0 || syscall_nr > SYSCALL_MAX) {
+        fprintf(stderr, "Invalid syscall number.\n");
+        return -1;
+    }
+
+    syscall_cmd.syscall_nr = syscall_nr;
+
+       vm_fd = open(vm_dev, O_RDONLY);
+
+       if (vm_fd < 0) { 
+               fprintf(stderr, "Error opening VM device: %s\n", vm_dev);
+               return -1;
+       }
+
+       ret = ioctl(vm_fd, V3_VM_SYSCALL_CTRL, &syscall_cmd);
+
+    if (ret < 0) {
+        fprintf(stderr, "Error with syscall control\n");
+        return -1;
+    }
+
+    if (syscall_cmd.cmd == SYSCALL_STAT) {
+        if (ret == SYSCALL_ON) 
+            printf("Selective exiting for syscall #%d is currently ON\n", syscall_cmd.syscall_nr);
+        else if (ret == SYSCALL_OFF) 
+            printf("Selective exiting for syscall #%d is currently OFF\n", syscall_cmd.syscall_nr);
+    } else if (syscall_cmd.cmd == SYSCALL_ON) {
+       printf("Selective exiting for syscall #%d ACTIVATED\n", syscall_cmd.syscall_nr);
+    } else if (syscall_cmd.cmd == SYSCALL_OFF) {
+        printf("Selective exiting for syscall #%d DEACTIVATED\n", syscall_cmd.syscall_nr);
+    }
+
+       return 0;
+}