Add kern.arnd sysctl. SSP code uses it to initialize the stack guard

magic value. Submitted by: Jeremie Le Hen <jeremie@le-hen.org>
freebsd · May 19, 2007 · 3ef9d41 · 3ef9d41
1 parent 00c7c13
commit 3ef9d41
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Showing 2 changed files with 14 additions and 1 deletion.
diff --git a/sys/kern/kern_mib.c b/sys/kern/kern_mib.c
@@ -151,6 +151,18 @@ SYSCTL_INT(_hw, HW_BYTEORDER, byteorder, CTLFLAG_RD,
 SYSCTL_INT(_hw, HW_PAGESIZE, pagesize, CTLFLAG_RD,
     0, PAGE_SIZE, "System memory page size");
 
+static int
+sysctl_kern_arnd(SYSCTL_HANDLER_ARGS)
+{
+	u_long val;
+
+	arc4rand(&val, sizeof(val), 0);
+	return (sysctl_handle_long(oidp, &val, 0, req));
+}
+
+SYSCTL_PROC(_kern, KERN_ARND, arandom, CTLFLAG_RD,
+	0, 0, sysctl_kern_arnd, "L", "arc4rand");
+
 static int
 sysctl_hw_physmem(SYSCTL_HANDLER_ARGS)
 {

diff --git a/sys/sys/sysctl.h b/sys/sys/sysctl.h
@@ -390,7 +390,8 @@ TAILQ_HEAD(sysctl_ctx_list, sysctl_ctx_entry);
 #define	KERN_LOGSIGEXIT		34	/* int: do we log sigexit procs? */
 #define	KERN_IOV_MAX		35	/* int: value of UIO_MAXIOV */
 #define	KERN_HOSTUUID		36	/* string: host UUID identifier */
-#define	KERN_MAXID		37	/* number of valid kern ids */
+#define	KERN_ARND		37	/* int: from arc4rand() */
+#define	KERN_MAXID		38	/* number of valid kern ids */
 
 #define CTL_KERN_NAMES { \
 	{ 0, 0 }, \