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4f64c5b3cf
freebsd-skq/lib/libc
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Konstantin Belousov 4f64c5b3cf __vdso_gettc(): be extra careful with /dev/hpet mappings, never unmap 
the mapping which might be accessed by other threads.

If a pointer to the /dev/hpet register page mapping was stored into
the hpet_dev_map, other threads might access the page at any time.
Never unmap it, instead, keep track of mappings for all hpet units in
smal array.  Store pointer to the newly mapped registers page using
CAS, to detect parallel mappings.

It appeared relatively easy to demonstrate the problem by arranging
two threads which perform gettimeofday(2) concurently, first time in
the process address space, when HPET is used for timecounter.

PR:	215715
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
2017-01-04 16:10:52 +00:00
..
aarch64 Attach the cortex strings library to the build. Only a subset of functions 2016-09-19 15:08:03 +00:00
amd64 Reduce duplicate NOASM and PSEUDO definitions 2016-09-08 22:38:20 +00:00
arm Reduce duplicate NOASM and PSEUDO definitions 2016-09-08 22:38:20 +00:00
capability
compat-43 Use ANSI C prototypes. Eliminates -Wold-style-definition warnings. 2015-09-20 20:53:24 +00:00
db hash(3): protect in-memory page when using cross-endianness. 2016-09-26 16:06:50 +00:00
gdtoa META MODE: Don't create .meta files when symlinking sources into the obj directory. 2015-11-25 19:44:43 +00:00
gen Rename the 'flags' argument to getfsstat() to 'mode' and validate it. 2016-12-27 20:21:11 +00:00
gmon Replace the last non-optional use of sbrk() in the tree with mmap(). 2016-01-21 18:17:19 +00:00
i386 Reduce duplicate NOASM and PSEUDO definitions 2016-09-08 22:38:20 +00:00
iconv citrus: Remove redundant code in _citrus_esdb_get_list(). 2016-06-02 17:28:39 +00:00
include Rewrite ptrace(2) wrappers in C. 2016-08-29 18:47:51 +00:00
inet Update ^/vendor/NetBSD/tests/dist to a more recent snapshot 2016-08-12 01:05:07 +00:00
isc libc: do not include <sys/types.h> where <sys/param.h> was already included 2016-04-18 21:05:15 +00:00
locale Move __hidden attribute towards the end of the declaration. 2016-12-31 15:30:00 +00:00
md
mips Add full softfloat and hardfloat support for MIPS. 2016-10-31 15:33:58 +00:00
nameser libc: spelling fixes. 2016-04-30 01:24:24 +00:00
net Cleanup inelegant calloc(3) introduced in r310984. 2017-01-02 15:17:33 +00:00
nls Use current locale (f.e. set by thread). It was global locale always 2016-08-24 16:44:27 +00:00
posix1e libc: spelling fixes. 2016-04-30 01:24:24 +00:00
powerpc Fix a typo which broke the build for powerpc. 2016-10-25 01:32:35 +00:00
powerpc64 Reduce duplicate NOASM and PSEUDO definitions 2016-09-08 22:38:20 +00:00
powerpcspe Fix a copy&paste-o causing a segfault with sigsetjmp. 2016-10-29 01:22:55 +00:00
quad
regex 1) Eliminate possibility to call __*collate_range_cmp() with inclomplete 2016-07-14 09:07:25 +00:00
resolv Don't leak addrinfo if ai->ai_addrlen <= minsiz test fails. 2016-06-08 09:40:06 +00:00
riscv Add full softfloat and hardfloat support for RISC-V. 2016-11-16 15:21:32 +00:00
rpc Update ^/vendor/NetBSD/tests/dist to a more recent snapshot 2016-08-12 01:05:07 +00:00
secure libc: do not include <sys/types.h> where <sys/param.h> was already included 2016-04-18 21:05:15 +00:00
softfloat Add full softfloat and hardfloat support for RISC-V. 2016-11-16 15:21:32 +00:00
sparc64 Reduce duplicate NOASM and PSEUDO definitions 2016-09-08 22:38:20 +00:00
stdio Revert r310138 2016-12-22 22:30:42 +00:00
stdlib Update jemalloc to 4.3.1. 2016-11-09 18:42:30 +00:00
stdtime 1) For already non-standard %z extension implement GNU compatible formats: 2016-09-21 15:47:40 +00:00
string Add timingsafe_bcmp and timingsafe_memcmp. 2016-08-14 23:38:50 +00:00
sys Rename the 'flags' argument to getfsstat() to 'mode' and validate it. 2016-12-27 20:21:11 +00:00
tests Support spaces in group names. 2016-12-06 23:43:04 +00:00
uuid libc: replace 0 with NULL for pointers. 2016-04-10 19:33:58 +00:00
x86/sys __vdso_gettc(): be extra careful with /dev/hpet mappings, never unmap 2017-01-04 16:10:52 +00:00
xdr libc/xdr: unsign some loop indexes. 2016-05-06 16:03:40 +00:00
yp Use on crypto.x and rpc.x from the source tree. 2016-06-28 19:53:16 +00:00
libc_nossp.ldscript Add different libc ldscript: the one without libssp -- 2016-10-12 13:19:21 +00:00
libc.ldscript
Makefile Add full softfloat and hardfloat support for RISC-V. 2016-11-16 15:21:32 +00:00
Makefile.depend DIRDEPS_BUILD: Regenerate without local dependencies. 2016-02-24 17:20:11 +00:00
Versions.def Create namespace for the symbols added during 12-CURRENT cycle. 2016-08-06 13:28:58 +00:00