From 32a932332c8bad842804842eaf9651ad6268e637 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Wed, 6 Feb 2008 22:39:44 +0100 Subject: brk randomization: introduce CONFIG_COMPAT_BRK based on similar patch from: Pavel Machek Introduce CONFIG_COMPAT_BRK. If disabled then the kernel is free (but not obliged to) randomize the brk area. Heap randomization breaks ancient binaries, so we keep COMPAT_BRK enabled by default. Signed-off-by: Ingo Molnar --- init/Kconfig | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'init') diff --git a/init/Kconfig b/init/Kconfig index 87f50df5889..92b23e25661 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -541,6 +541,18 @@ config ELF_CORE help Enable support for generating core dumps. Disabling saves about 4k. +config COMPAT_BRK + bool "Disable heap randomization" + default y + help + Randomizing heap placement makes heap exploits harder, but it + also breaks ancient binaries (including anything libc5 based). + This option changes the bootup default to heap randomization + disabled, and can be overriden runtime by setting + /proc/sys/kernel/randomize_va_space to 2. + + On non-ancient distros (post-2000 ones) Y is usually a safe choice. + config BASE_FULL default y bool "Enable full-sized data structures for core" if EMBEDDED -- cgit v1.2.3