HardenedBSD/libexec
Konstantin Belousov 760e34772c Fix order of destructors between main binary and libraries.
Since inits for the main binary are run from rtld (for some time), the
rtld_exit atexit(3) handler, which is passed from rtld to the program
entry and installed by csu, is installed after any atexit(3) handlers
installed by main binary constructors.  This means that rtld_exit() is
fired before main binary handlers.

Typical C++ static constructors are executed from init (either binary
or libs) but use atexit(3) to ensure that destructors are called in
the right order, independent of the linking order.  Also, C++
libraries finalizers call __cxa_finalize(3) to flush library'
atexit(3) entries.  Since atexit(3) entry is cleared after being run,
this would be mostly innocent, except that, atexit(rtld_exit) done
after main binary constructors, makes destructors from libraries
executed before destructors for main.

Fix by reordering atexit(rtld_exit) before inits for main binary, same
as it happened when inits were called by csu.  Do it using new private
libc symbol with pre-defined ABI.

Reported. tested, and reviewed by:	kan
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2019-04-15 13:03:09 +00:00
..
atf
atrun
blacklistd-helper
bootpd
comsat
dma
fingerd
ftpd
getty
hyperv
mail.local
makewhatis.local
mknetid
pppoed
rbootd
rc
revnetgroup
rpc.rquotad
rpc.rstatd
rpc.rusersd
rpc.rwalld
rpc.sprayd
rtld-aout
rtld-elf Fix order of destructors between main binary and libraries. 2019-04-15 13:03:09 +00:00
save-entropy
smrsh
talkd
tcpd
telnetd
tests
tftp-proxy
tftpd
ulog-helper
ypxfr
Makefile
Makefile.amd64
Makefile.i386
Makefile.inc