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c34a5f16fa
freebsd-nq/lib/libc
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Kyle Evans c34a5f16fa posix_spawn(3): handle potential signal issues with vfork 
Described in [1], signal handlers running in a vfork child have
opportunities to corrupt the parent's state. Address this by adding a new
rfork(2) flag, RFSPAWN, that has vfork(2) semantics but also resets signal
handlers in the child during creation.

x86 uses rfork_thread(3) instead of a direct rfork(2) because rfork with
RFMEM/RFSPAWN cannot work when the return address is stored on the stack --
further information about this problem is described under RFMEM in the
rfork(2) man page.

Addressing this has been identified as a prerequisite to using posix_spawn
in subprocess on FreeBSD [2].

[1] https://ewontfix.com/7/
[2] https://bugs.python.org/issue35823

Reviewed by:	jilles, kib
Differential Revision:	https://reviews.freebsd.org/D19058
2019-09-25 19:22:03 +00:00
..
aarch64 Fix initial exec TLS mode for dynamically loaded shared objects. 2019-03-29 17:52:57 +00:00
amd64 Remove resolver_qual from DEFINE_IFUNC/DEFINE_UIFUNC macros. 2019-05-16 22:20:54 +00:00
arm Add arm_sync_icache() and arm_drain_writebuf() sysarch syscall wrappers. 2019-07-13 15:34:29 +00:00
capability Replace dot-dot relative pathing with SRCTOP-relative paths where possible 2017-01-20 03:23:24 +00:00
compat-43 Adjust history, info source from v1's manuals 2019-09-04 13:44:46 +00:00
db Remove "All rights reserved" from my files. 2018-05-10 06:41:08 +00:00
gdtoa libc: further adoption of SPDX licensing ID tags. 2017-11-25 17:12:48 +00:00
gen posix_spawn(3): handle potential signal issues with vfork 2019-09-25 19:22:03 +00:00
gmon mcount: tidy up ANSIfication 2018-10-20 22:39:35 +00:00
i386 remove obsolete i386 MD memchr implementation 2019-09-25 16:49:22 +00:00
iconv libc: correct iconv buffer overflow 2019-07-02 23:56:37 +00:00
include Add linux-compatible memfd_create 2019-09-25 18:03:18 +00:00
inet libc: fix cases of undefined behavior. 2018-08-07 15:24:19 +00:00
isc SPDX: more ISC-related files. 2017-12-08 17:52:53 +00:00
locale Improve the description of big5(5) 2019-09-14 08:15:16 +00:00
md Replace dot-dot relative pathing with SRCTOP-relative paths where possible 2017-01-20 03:23:24 +00:00
mips mips: fix some mcount nits 2019-09-02 01:55:55 +00:00
nameser Bounds check again after advancing cp, otherwise we have a possible 2019-09-05 19:35:30 +00:00
net Increase YPMAXRECORD to 16M to be compatible with Linux. 2019-08-12 20:27:33 +00:00
nls Create new EINTEGRITY error with message "Integrity check failed". 2019-01-17 06:35:45 +00:00
posix1e Remove some redundant code in _posix1e_acl_strip_np 2019-02-19 19:15:15 +00:00
powerpc powerpc: Transition to Secure-PLT, like most other OSs 2019-06-25 00:40:44 +00:00
powerpc64 revert r346588 for now 2019-05-11 15:17:42 +00:00
powerpcspe Fix fabs(3) for powerpcspe, this time for real 2018-07-26 14:42:20 +00:00
quad Revert r351078, r351085: stand/quad.h eviction 2019-08-15 17:15:32 +00:00
regex lib/libc/regex: fix build with REDEBUG defined 2019-09-24 12:21:01 +00:00
resolv Rather than using the legacy IP struct fields in the union for the 2019-06-04 20:53:35 +00:00
riscv Fix initial exec TLS mode for dynamically loaded shared objects. 2019-03-29 17:52:57 +00:00
rpc Increase YPMAXRECORD to 16M to be compatible with Linux. 2019-08-12 20:27:33 +00:00
secure Carefully update stack guard bytes inside __guard_setup(). 2018-04-24 15:59:39 +00:00
softfloat Add implementations for clog(3), clogf(3), and clog(3). 2018-05-13 09:54:34 +00:00
sparc64 Fix initial exec TLS mode for dynamically loaded shared objects. 2019-03-29 17:52:57 +00:00
stdio libc: remove gets 2019-09-01 16:12:05 +00:00
stdlib bsearch.3: Improve the example. 2019-07-17 19:29:55 +00:00
stdtime strptime: make %k and %l specifiers match their description in 2018-11-03 23:37:13 +00:00
string libc: Use musl's optimized memchr 2019-09-02 13:56:44 +00:00
sys posix_spawn(3): handle potential signal issues with vfork 2019-09-25 19:22:03 +00:00
tests Unskip test cases from netbsd-tests by defining __HAVE_FENV 2019-08-31 20:45:45 +00:00
uuid libc: further adoption of SPDX licensing ID tags. 2017-11-25 17:12:48 +00:00
x86 Remove resolver_qual from DEFINE_IFUNC/DEFINE_UIFUNC macros. 2019-05-16 22:20:54 +00:00
xdr General further adoption of SPDX licensing ID tags. 2017-11-20 19:49:47 +00:00
yp Increase the size of the send and receive buffers for YP client rpc 2019-09-16 06:42:01 +00:00
libc_nossp.ldscript Add different libc ldscript: the one without libssp -- 2016-10-12 13:19:21 +00:00
libc.ldscript
Makefile revert r341429 "disable BIND_NOW in libc, libthr, and rtld" 2019-03-28 02:12:32 +00:00
Makefile.depend
Versions.def Create namespace for the symbols added during 13-CURRENT cycle. 2018-11-12 19:12:14 +00:00