From: Philip Homburg <philip@cs.vu.nl>
Date: Tue, 7 Aug 2007 12:19:45 +0000 (+0000)
Subject: Removed check for grants that wrap.
X-Git-Tag: v3.1.4~349
X-Git-Url: http://zhaoyanbai.com/repos/%22/xml/v3/zones/static/man.7.txt?a=commitdiff_plain;h=4f787035ea772054ff883e7f74987c79cded288b;p=minix.git

Removed check for grants that wrap.
---

diff --git a/kernel/system/do_safecopy.c b/kernel/system/do_safecopy.c
index efe89395a..b8c4d7892 100644
--- a/kernel/system/do_safecopy.c
+++ b/kernel/system/do_safecopy.c
@@ -141,15 +141,6 @@ endpoint_t *e_granter;		/* new granter (magic grants) */
 			return EPERM;
 		}
 
-		/* Don't fiddle around with grants that wrap, arithmetic
-		 * below may be confused.
-		 */
-		if(MEM_TOP - g.cp_u.cp_magic.cp_len <
-			g.cp_u.cp_magic.cp_start - 1) {
-			kprintf("magic grant verify failed: len too long\n");
-			return EPERM;
-		}
-
 		/* Verify actual grantee. */
 		if(g.cp_u.cp_magic.cp_who_to != grantee && grantee != ANY) {
 			kprintf("magic grant verify failed: bad grantee\n");