linux-kernel - [PATCH]i386: fix overflow in vmap on an x86 system which has more than 4GB memory.

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1158334477.5219.1.camel@antonovi-desktop>
Date:	Fri, 15 Sep 2006 11:34:37 -0400
From:	Anatoli Antonovitch <antonovi@....com>
To:	linux-kernel@...r.kernel.org
Subject: [PATCH]i386: fix overflow in vmap on an x86 system which has more
	than 4GB memory.

Description
(max_mapnr << PAGE_SHIFT) would overflow on an x86 system which has more
than 4GB memory, and hence cause vmap to fail every time.


Signed-off-by: Michael Chen <micche@....com>

Patch
diff -Nur linux-2.4.21-40.EL/mm/vmalloc.c
linux-2.4.21-40.EL.diff/mm/vmalloc.c
--- linux-2.4.21-40.EL/mm/vmalloc.c     2006-02-02 21:13:20.000000000
-0600
+++ linux-2.4.21-40.EL.diff/mm/vmalloc.c        2006-09-04
11:29:33.000000000 -0500
@@ -298,8 +298,8 @@
        struct vm_struct *area;
        unsigned long size = count << PAGE_SHIFT;
 
-       if (!size || size > (max_mapnr << PAGE_SHIFT))
-               return NULL;
+    if (!count || count > max_mapnr)
+        return NULL;
        area = get_vm_area(size, flags);
        if (!area) {
                return NULL;


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/