Ingo Molnar e6e5494cb2 [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 17:32:38 -07:00
..
array.c	[PATCH] hrtimers: remove it_real_value calculation from proc/*/stat	2006-03-26 08:57:02 -08:00
base.c	[PATCH] SELinux: Add sockcreate node to procattr API	2006-06-26 09:58:26 -07:00
generic.c	[PATCH] mark f_ops const in the inode	2006-03-28 09:16:05 -08:00
inode-alloc.txt	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
inode.c	[PATCH] proc: Use struct pid not struct task_ref	2006-06-26 09:58:26 -07:00
internal.h	[PATCH] proc: Use struct pid not struct task_ref	2006-06-26 09:58:26 -07:00
kcore.c	[PATCH] Make most file operations structs in fs/ const	2006-03-28 09:16:06 -08:00
kmsg.c	[PATCH] Make most file operations structs in fs/ const	2006-03-28 09:16:06 -08:00
Makefile	[PATCH] kdump: Access dump file in elf format (/proc/vmcore)	2005-06-25 16:24:53 -07:00
mmu.c	[PATCH] fix impossible VmallocChunk	2005-05-17 07:59:10 -07:00
nommu.c	[PATCH] output of /proc/maps on nommu systems is incomplete	2005-10-17 17:03:57 -07:00
proc_devtree.c	[PATCH] powerpc: Cope with duplicate node & property names in /proc/device-tree	2006-03-28 16:45:23 +11:00
proc_misc.c	[PATCH] Simplify proc/devices and fix early termination regression	2006-03-31 12:18:53 -08:00
proc_tty.c	Linux-2.6.12-rc2	2005-04-16 15:20:36 -07:00
root.c	[PATCH] VFS: Permit filesystem to override root dentry on mount	2006-06-23 07:42:45 -07:00
task_mmu.c	[PATCH] vdso: randomize the i386 vDSO by moving it into a vma	2006-06-27 17:32:38 -07:00
task_nommu.c	[PATCH] proc: Move proc_maps_operations into task_mmu.c	2006-06-26 09:58:24 -07:00
vmcore.c	[PATCH] kdump proc vmcore size oveflow fix	2006-04-11 06:18:42 -07:00