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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---

• References:
  • [PATCH] IA64,sparc: local DoS with corrupted ELFs
    • From: Kirill Korotaev <[email protected]>
  • Re: [PATCH] IA64,sparc: local DoS with corrupted ELFs
    • From: Kyle McMartin <[email protected]>

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