From 6d90776dff7e70e08fa46f9cd7576dd0eeb06da2 Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Wed, 18 Jul 2018 11:34:35 -0700 Subject: x86/CET: Document glibc.tune.x86_ibt and glibc.tune.x86_shstk * manual/tunables.texi: Document glibc.tune.x86_ibt and glibc.tune.x86_shstk. --- manual/tunables.texi | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) (limited to 'manual') diff --git a/manual/tunables.texi b/manual/tunables.texi index be33c9fc79..bb4819bdf1 100644 --- a/manual/tunables.texi +++ b/manual/tunables.texi @@ -356,3 +356,31 @@ to set threshold in bytes for non temporal store. This tunable is specific to i386 and x86-64. @end deftp + +@deftp Tunable glibc.tune.x86_ibt +The @code{glibc.tune.x86_ibt} tunable allows the user to control how +indirect branch tracking (IBT) should be enabled. Accepted values are +@code{on}, @code{off}, and @code{permissive}. @code{on} always turns +on IBT regardless of whether IBT is enabled in the executable and its +dependent shared libraries. @code{off} always turns off IBT regardless +of whether IBT is enabled in the executable and its dependent shared +libraries. @code{permissive} is the same as the default which disables +IBT on non-CET executables and shared libraries. + +This tunable is specific to i386 and x86-64. +@end deftp + +@deftp Tunable glibc.tune.x86_shstk +The @code{glibc.tune.x86_shstk} tunable allows the user to control how +the shadow stack (SHSTK) should be enabled. Accepted values are +@code{on}, @code{off}, and @code{permissive}. @code{on} always turns on +SHSTK regardless of whether SHSTK is enabled in the executable and its +dependent shared libraries. @code{off} always turns off SHSTK regardless +of whether SHSTK is enabled in the executable and its dependent shared +libraries. @code{permissive} changes how dlopen works on non-CET shared +libraries. By default, when SHSTK is enabled, dlopening a non-CET shared +library returns an error. With @code{permissive}, it turns off SHSTK +instead. + +This tunable is specific to i386 and x86-64. +@end deftp -- cgit 1.4.1