Reword description of SXID_* tunable properties

The SXID_* tunable properties only influence processes that are
AT_SECURE, so make that a bit more explicit in the documentation and
comment.

Revisiting the code after a few years I managed to confuse myself, so
I imagine there could be others who may have incorrectly assumed like
I did that the SXID_ERASE tunables are not inherited by children of
non-AT_SECURE processes.

Reviewed-by: Florian Weimer <fweimer@redhat.com>

1 files changed, 6 insertions, 5 deletions

diff --git a/elf/dl-tunables.list b/elf/dl-tunables.list
index 35634ef24d..e1d8225128 100644
--- a/elf/dl-tunables.list
+++ b/elf/dl-tunables.list
@@ -21,12 +21,13 @@
 # minval: Optional minimum acceptable value
 # maxval: Optional maximum acceptable value
 # env_alias: An alias environment variable
-# security_level: Specify security level of the tunable.  Valid values are:
+# security_level: Specify security level of the tunable for AT_SECURE binaries.
+# 		  Valid values are:
 #
-# 	     SXID_ERASE: (default) Don't read for AT_SECURE binaries and
-# 	     		 removed so that child processes can't read it.
-# 	     SXID_IGNORE: Don't read for AT_SECURE binaries, but retained for
-# 	     		  non-AT_SECURE subprocesses.
+# 	     SXID_ERASE: (default) Do not read and do not pass on to
+# 	     child processes.
+# 	     SXID_IGNORE: Do not read, but retain for non-AT_SECURE
+# 	     subprocesses.
 # 	     NONE: Read all the time.
 
 glibc {