Module Name: src
Committed By: riastradh
Date: Wed Aug 3 09:40:25 UTC 2022
Modified Files:
src/sys/kern: kern_ras.c
Log Message:
rasctl(2): Avoid overflow in address range arithmetic.
Remove various contortions to suppress warnings. Rely on
-Wno-type-limits instead.
Reported-by: [email protected]
https://syzkaller.appspot.com/bug?id=e9055200701cffd653d5b13491d85c34e07f06a3
To generate a diff of this commit:
cvs rdiff -u -r1.40 -r1.41 src/sys/kern/kern_ras.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/sys/kern/kern_ras.c
diff -u src/sys/kern/kern_ras.c:1.40 src/sys/kern/kern_ras.c:1.41
--- src/sys/kern/kern_ras.c:1.40 Sat Dec 14 16:58:25 2019
+++ src/sys/kern/kern_ras.c Wed Aug 3 09:40:25 2022
@@ -1,4 +1,4 @@
-/* $NetBSD: kern_ras.c,v 1.40 2019/12/14 16:58:25 riastradh Exp $ */
+/* $NetBSD: kern_ras.c,v 1.41 2022/08/03 09:40:25 riastradh Exp $ */
/*-
* Copyright (c) 2002, 2006, 2007, 2008 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_ras.c,v 1.40 2019/12/14 16:58:25 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_ras.c,v 1.41 2022/08/03 09:40:25 riastradh Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@@ -156,14 +156,6 @@ ras_purgeall(void)
#if defined(__HAVE_RAS)
-#if __GNUC_PREREQ__(4, 8)
-#define __WARNING_PUSH_LESS_NULL_PTR _Pragma("GCC diagnostic push") _Pragma("GCC diagnostic ignored \"-Wextra\"")
-#define __WARNING_POP_LESS_NULL_PTR _Pragma("GCC diagnostic pop")
-#else
-#define __WARNING_PUSH_LESS_NULL_PTR
-#define __WARNING_POP_LESS_NULL_PTR
-#endif
-
/*
* Install the new sequence. If it already exists, return
* an error.
@@ -180,17 +172,12 @@ ras_install(void *addr, size_t len)
if (len == 0)
return EINVAL;
- endaddr = (char *)addr + len;
-
- /* Do not warn about < NULL pointer comparison */
- __WARNING_PUSH_LESS_NULL_PTR
- if (addr < (void *)VM_MIN_ADDRESS || addr > (void *)VM_MAXUSER_ADDRESS)
- return EINVAL;
- if (endaddr > (void *)VM_MAXUSER_ADDRESS)
+ if ((uintptr_t)addr < VM_MIN_ADDRESS ||
+ (uintptr_t)addr > VM_MAXUSER_ADDRESS)
return EINVAL;
- if (endaddr < addr)
+ if (len > VM_MAXUSER_ADDRESS - (uintptr_t)addr)
return EINVAL;
- __WARNING_POP_LESS_NULL_PTR
+ endaddr = (char *)addr + len;
newrp = kmem_alloc(sizeof(*newrp), KM_SLEEP);
newrp->ras_startaddr = addr;
