Tunable with environment variables aliases are also ignored if
glibc.rtld.enable_secure is enabled. The tunable parsing is also
optimized a bit, where the loop that checks each environment variable
only checks for the tunables with aliases instead of all tables.
Checked on aarch64-linux-gnu and x86_64-linux-gnu.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Add a tunable for setting __libc_enable_secure to 1. Do not set
__libc_enable_secure to 0 if the tunable is set to 0. Ignore all
tunables if glib.rtld.enable_secure is set. One use-case for this
addition is to enable testing code paths that depend on
__libc_enable_secure being set without the need to use setxid binaries.
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Paul Eggert
Adhemerval Zanella
Joe Simmons-Talbott