linux-kernel - Re: [PATCH] IA64,sparc: local DoS with corrupted ELFs

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Message-ID: <44FD76E7.10407@sw.ru>
Date:	Tue, 05 Sep 2006 17:08:55 +0400
From:	Kirill Korotaev <dev@...ru>
To:	Kyle McMartin <kyle@...isc-linux.org>
CC:	Andrew Morton <akpm@...l.org>, Linus Torvalds <torvalds@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Fernando Vazquez <fernando@....ntt.co.jp>,
	"David S. Miller" <davem@...emloft.net>, tony.luck@...el.com,
	linux-ia64@...r.kernel.org, stable@...nel.org, xemul@...nvz.org,
	devel@...nvz.org
Subject: Re: [PATCH] IA64,sparc: local DoS with corrupted ELFs

Andrew, Kyle,

> On Mon, Sep 04, 2006 at 04:17:00PM +0400, Kirill Korotaev wrote:
> 
>>--- a/include/asm-generic/mman.h
>>+++ b/include/asm-generic/mman.h
>>@@ -39,4 +39,10 @@ #define MADV_DOFORK	11		/* do inherit ac
>>#define MAP_ANON	MAP_ANONYMOUS
>>#define MAP_FILE	0
>>
>>+#ifdef __KERNEL__
>>+#ifndef arch_mmap_check
>>+#define arch_mmap_check(addr, len, flags)	(0)
>>+#endif
>>+#endif
>>+
>>#endif
> 
> 
> This breaks all arches that don't use asm-generic/mman.h, and that you
> didn't add arch_mmap_check to asm/mman.h for.

oops... You are right.

is define 
#define arch_mmap_check(addr, len, flags)	(0)
ok for you in such mman.h headers which do not include asm-generic/mman.h?
If yes, the following patch should help.

Though I didn't get the idea of include/asm-um/mman.h:
#include "asm/arch/mman.h"

This patch adds define of arch_mmap_check() to
archs which do not include include/asm-generic/mman.h

---

diff --git a/include/asm-alpha/mman.h b/include/asm-alpha/mman.h
index 5f24c75..51cf354 100644
--- a/include/asm-alpha/mman.h
+++ b/include/asm-alpha/mman.h
@@ -52,4 +52,10 @@ #define MADV_DOFORK	11		/* do inherit ac
 #define MAP_ANON	MAP_ANONYMOUS
 #define MAP_FILE	0
 
+#ifdef __KERNEL__
+#ifndef arch_mmap_check
+#define arch_mmap_check(addr, len, flags)	(0)
+#endif
+#endif
+
 #endif /* __ALPHA_MMAN_H__ */
diff --git a/include/asm-mips/mman.h b/include/asm-mips/mman.h
index 046cf68..f19e858 100644
--- a/include/asm-mips/mman.h
+++ b/include/asm-mips/mman.h
@@ -75,4 +75,10 @@ #define MADV_DOFORK	11		/* do inherit ac
 #define MAP_ANON	MAP_ANONYMOUS
 #define MAP_FILE	0
 
+#ifdef __KERNEL__
+#ifndef arch_mmap_check
+#define arch_mmap_check(addr, len, flags)	(0)
+#endif
+#endif
+
 #endif /* _ASM_MMAN_H */
diff --git a/include/asm-parisc/mman.h b/include/asm-parisc/mman.h
index 0ef15ee..9829b31 100644
--- a/include/asm-parisc/mman.h
+++ b/include/asm-parisc/mman.h
@@ -59,4 +59,10 @@ #define MAP_ANON	MAP_ANONYMOUS
 #define MAP_FILE	0
 #define MAP_VARIABLE	0
 
+#ifdef __KERNEL__
+#ifndef arch_mmap_check
+#define arch_mmap_check(addr, len, flags)	(0)
+#endif
+#endif
+
 #endif /* __PARISC_MMAN_H__ */

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