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--- addressspacelayoutrandomization [2022/02/06 15:46] – ASLR has not been x86-only for years EdMaste
+++ addressspacelayoutrandomization [2023/07/31 18:28] (current) – Mention this page is old EdMaste
@@ Line 1: / Line 1: @@
+NOTE: this page was created while the patch was in development and served to record some information of interest to the developers. Some of the information is outdated.
 ====== Address Space Layout Randomization (ASLR) ======
-Support for Address Space Layout Randomization was added in %%FreeBSD%% HEAD (13-CURRENT) in [[https://svnweb.freebsd.org/changeset/base/343964|base r343964]]. It is enabled  by default in 14-CURRENT for 64bit architectures, as of [[https://cgit.freebsd.org/src/commit/sys/kern/imgact_elf.c?id=b014e0f15bc73d80ef49b64fd1f8c29f469467cb|base commit b014e0f15bc7]].
+Support for Address Space Layout Randomization was added in %%FreeBSD%% HEAD (13-CURRENT) in [[https://svnweb.freebsd.org/changeset/base/343964|base r343964]]. It is enabled  by default in 14-CURRENT for 64bit architectures, as of [[https://cgit.freebsd.org/src/commit/sys/kern/imgact_elf.c?id=b014e0f15bc73d80ef49b64fd1f8c29f469467cb|base commit b014e0f15bc7]].  It is enabled by default for 64-bit architectures in %%FreeBSD%% 13.2 and later releases.
 ===== Architectures =====
@@ Line 20: / Line 22: @@
   * procctl(2) adds PROC_ASLR_CTL / PROC_ASLR_STATUS
   * NT_FREEBSD_FCTL_ASLR_DISABLE feature control note bit makes it possible to force ASLR off for the given binary. A tool to edit the feature control note is in development.
-Application configurations:
-  * ntpd will segfault (usually but not always) when stack gap !=0. Either:
-    * Set kern.elf64.aslr.stack_gap or kern.elf32.aslr.stack_gap (whichever is applicable to your system) to 0, or
-    * Add ntpd_prepend="/usr/bin/proccontrol -m aslr -s disable" to rc.conf, or
-    * If running ntpd by hand or one's own script, proccontrol -m aslr -s disable ntpd $ntpd_args
 ----