Konstantin Belousov a687683b99 rtld: mask signals for default read locks ... Rtld locks from libthr defer signals delivery, which means that binding is not possible while a signal handler is executed. Binding might upgrade read-locked rtld_bind_lock to write-lock, if symbol resolution requires loading filters. If a signal would be delivered while rtld is in read-locked section, and signal handler needs binding which upgrades the lock, for non-threaded image that uses default rtld locks, we get the rtld data structures modified under the top-level active rtld frame. To correct the problem, mask signals for read-locking of default locks in addition to the write-locking. It is very cheap now with sigfastblock(2). Note that the global state is used to track pre-locked state of either sigfastblock(2) or signal mask (if sigfastblock(2) is administratively disabled). It is fine for non-threaded images since there are no other threads. But I believe that it is fine for threaded images using libc_r as well, since masking signals disables preemption (I did not tested it). NetBSD PR: https://gnats.netbsd.org/56979 Reported by: tmunro Reviewed by: markj Sponsored by: The FreeBSD Foundation MFC after: 2 weeks Differential revision: https://reviews.freebsd.org/D36396		2022-09-04 07:28:02 +03:00
..
atf
atrun
blacklistd-helper
bootpd
comsat
dma
fingerd
flua
ftpd
getty
hyperv
mail.local
makewhatis.local
mknetid
phttpget
pppoed
rbootd
rc	rc.conf: Fix a typo in a comment	2022-09-03 14:57:39 +02:00
revnetgroup
rpc.rquotad
rpc.rstatd
rpc.rusersd
rpc.rwalld
rpc.sprayd
rtld-elf	rtld: mask signals for default read locks	2022-09-04 07:28:02 +03:00
rtld-elf32
save-entropy
smrsh
talkd
tcpd
telnetd
tests
tftp-proxy
tftpd
ulog-helper
ypxfr
Makefile
Makefile.amd64
Makefile.i386
Makefile.inc