2008-10-22 23:26:29 -06:00
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#ifndef _ASM_X86_PAGE_32_H
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#define _ASM_X86_PAGE_32_H
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2008-01-30 05:32:44 -07:00
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2009-02-08 23:52:14 -07:00
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#include <asm/page_32_types.h>
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2008-02-08 16:15:06 -07:00
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2009-02-13 05:36:47 -07:00
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#ifndef __ASSEMBLY__
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2008-01-30 05:32:44 -07:00
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#ifdef CONFIG_HUGETLB_PAGE
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#define HAVE_ARCH_HUGETLB_UNMAPPED_AREA
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#endif
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2005-04-16 16:20:36 -06:00
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2008-10-03 09:54:25 -06:00
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#define __phys_addr_nodebug(x) ((x) - PAGE_OFFSET)
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2008-06-12 05:56:40 -06:00
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#ifdef CONFIG_DEBUG_VIRTUAL
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2008-06-12 05:56:40 -06:00
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extern unsigned long __phys_addr(unsigned long);
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2008-06-12 05:56:40 -06:00
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#else
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2008-10-03 09:54:25 -06:00
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#define __phys_addr(x) __phys_addr_nodebug(x)
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2008-06-12 05:56:40 -06:00
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#endif
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2008-01-30 05:32:44 -07:00
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#define __phys_reloc_hide(x) RELOC_HIDE((x), 0)
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#ifdef CONFIG_FLATMEM
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#define pfn_valid(pfn) ((pfn) < max_mapnr)
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#endif /* CONFIG_FLATMEM */
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#ifdef CONFIG_X86_USE_3DNOW
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#include <asm/mmx.h>
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[PATCH] vdso: randomize the i386 vDSO by moving it into a vma
Move the i386 VDSO down into a vma and thus randomize it.
Besides the security implications, this feature also helps debuggers, which
can COW a vma-backed VDSO just like a normal DSO and can thus do
single-stepping and other debugging features.
It's good for hypervisors (Xen, VMWare) too, which typically live in the same
high-mapped address space as the VDSO, hence whenever the VDSO is used, they
get lots of guest pagefaults and have to fix such guest accesses up - which
slows things down instead of speeding things up (the primary purpose of the
VDSO).
There's a new CONFIG_COMPAT_VDSO (default=y) option, which provides support
for older glibcs that still rely on a prelinked high-mapped VDSO. Newer
distributions (using glibc 2.3.3 or later) can turn this option off. Turning
it off is also recommended for security reasons: attackers cannot use the
predictable high-mapped VDSO page as syscall trampoline anymore.
There is a new vdso=[0|1] boot option as well, and a runtime
/proc/sys/vm/vdso_enabled sysctl switch, that allows the VDSO to be turned
on/off.
(This version of the VDSO-randomization patch also has working ELF
coredumping, the previous patch crashed in the coredumping code.)
This code is a combined work of the exec-shield VDSO randomization
code and Gerd Hoffmann's hypervisor-centric VDSO patch. Rusty Russell
started this patch and i completed it.
[akpm@osdl.org: cleanups]
[akpm@osdl.org: compile fix]
[akpm@osdl.org: compile fix 2]
[akpm@osdl.org: compile fix 3]
[akpm@osdl.org: revernt MAXMEM change]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Cc: Gerd Hoffmann <kraxel@suse.de>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Zachary Amsden <zach@vmware.com>
Cc: Andi Kleen <ak@muc.de>
Cc: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-06-27 03:53:50 -06:00
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2008-01-30 05:32:44 -07:00
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static inline void clear_page(void *page)
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{
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mmx_clear_page(page);
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}
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2005-04-16 16:20:36 -06:00
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2008-01-30 05:32:44 -07:00
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static inline void copy_page(void *to, void *from)
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{
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mmx_copy_page(to, from);
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}
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#else /* !CONFIG_X86_USE_3DNOW */
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#include <linux/string.h>
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2005-04-16 16:20:36 -06:00
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2008-01-30 05:32:44 -07:00
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static inline void clear_page(void *page)
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{
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memset(page, 0, PAGE_SIZE);
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}
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2005-09-03 16:54:30 -06:00
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2008-01-30 05:32:44 -07:00
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static inline void copy_page(void *to, void *from)
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{
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memcpy(to, from, PAGE_SIZE);
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}
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#endif /* CONFIG_X86_3DNOW */
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#endif /* !__ASSEMBLY__ */
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2006-04-27 08:48:08 -06:00
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2008-10-22 23:26:29 -06:00
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#endif /* _ASM_X86_PAGE_32_H */
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