From 1ec7fd50ba4f845d1cf6b67acabd774577ef13b6 Mon Sep 17 00:00:00 2001 From: Jiri Kosina Date: Sat, 9 Feb 2008 23:24:08 +0100 Subject: brk: document randomize_va_space and CONFIG_COMPAT_BRK (was Re: Document randomize_va_space and CONFIG_COMPAT_BRK. Signed-off-by: Jiri Kosina Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- Documentation/sysctl/kernel.txt | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) (limited to 'Documentation') diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt index 8984a539627..dc8801d4e94 100644 --- a/Documentation/sysctl/kernel.txt +++ b/Documentation/sysctl/kernel.txt @@ -41,6 +41,7 @@ show up in /proc/sys/kernel: - pid_max - powersave-nap [ PPC only ] - printk +- randomize_va_space - real-root-dev ==> Documentation/initrd.txt - reboot-cmd [ SPARC only ] - rtsig-max @@ -280,6 +281,34 @@ send before ratelimiting kicks in. ============================================================== +randomize-va-space: + +This option can be used to select the type of process address +space randomization that is used in the system, for architectures +that support this feature. + +0 - Turn the process address space randomization off by default. + +1 - Make the addresses of mmap base, stack and VDSO page randomized. + This, among other things, implies that shared libraries will be + loaded to random addresses. Also for PIE-linked binaries, the location + of code start is randomized. + + With heap randomization, the situation is a little bit more + complicated. + There a few legacy applications out there (such as some ancient + versions of libc.so.5 from 1996) that assume that brk area starts + just after the end of the code+bss. These applications break when + start of the brk area is randomized. There are however no known + non-legacy applications that would be broken this way, so for most + systems it is safe to choose full randomization. However there is + a CONFIG_COMPAT_BRK option for systems with ancient and/or broken + binaries, that makes heap non-randomized, but keeps all other + parts of process address space randomized if randomize_va_space + sysctl is turned on. + +============================================================== + reboot-cmd: (Sparc only) ??? This seems to be a way to give an argument to the Sparc -- cgit v1.2.3 From 185c045c245f46485ad8bbd8cc1100e986ff3f13 Mon Sep 17 00:00:00 2001 From: Harvey Harrison Date: Sat, 9 Feb 2008 23:24:09 +0100 Subject: x86, core: remove CONFIG_FORCED_INLINING Other than the defconfigs, remove the entry in compiler-gcc4.h, Kconfig.debug and feature-removal-schedule.txt. Signed-off-by: Harvey Harrison Signed-off-by: Ingo Molnar Signed-off-by: Thomas Gleixner --- Documentation/feature-removal-schedule.txt | 9 --------- 1 file changed, 9 deletions(-) (limited to 'Documentation') diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt index ce9503c892b..557f4a2f165 100644 --- a/Documentation/feature-removal-schedule.txt +++ b/Documentation/feature-removal-schedule.txt @@ -111,15 +111,6 @@ Who: Christoph Hellwig --------------------------- -What: CONFIG_FORCED_INLINING -When: June 2006 -Why: Config option is there to see if gcc is good enough. (in january - 2006). If it is, the behavior should just be the default. If it's not, - the option should just go away entirely. -Who: Arjan van de Ven - ---------------------------- - What: eepro100 network driver When: January 2007 Why: replaced by the e100 driver -- cgit v1.2.3