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Adhemerval Zanella 0cb313f7cb Fix clone (CLONE_VM) pid/tid reset (BZ#19957) 
As discussed in libc-alpha [1] current clone with CLONE_VM (without
CLONE_THREAD set) will reset the pthread pid/tid fields to -1.  The
issue is since memory is shared between the parent and child it will
clobber parent's cached pid/tid leading to internal inconsistencies
if the value is not restored.

And even it is restored it may lead to racy conditions when between
set/restore a thread might invoke pthread function that validate the
pthread with INVALID_TD_P/INVALID_NOT_TERMINATED_TD_P and thus get
wrong results.

As stated in BZ19957, previously reports of this behaviour was close
with EWONTFIX due the fact usage of clone outside glibc is tricky
since glibc requires consistent internal pthread, while using clone
directly may not provide it. However since now posix_spawn uses
clone (CLONE_VM) to fixes various issues related to previous vfork
usage this issue requires fixing.

The vfork implementation also does something similar, but instead
it negates and restores only the *pid* field and functions that
might access its value know to handle such case (getpid, raise
and pthread ones that uses INVALID_TD_P/INVALID_NOT_TERMINATED_TD_P
macros that check only *tid* field).  Also vfork does not call
__clone directly, instead calling either __NR_vfork or __NR_clone
directly.

So this patch removes this clone behavior by avoiding setting
the pthread pid/tid field for CLONE_VM. There is no need to
check for CLONE_THREAD, since the minimum supported kernel in all
architecture implies that CLONE_VM must be used with CLONE_THREAD,
otherwise clone returns EINVAL.

Instead of current approach of:

   int clone(int (*fn)(void *), void *child_stack, int flags, ...)
      [...]
      if (flags & CLONE_THREAD)
        goto do_syscall;
      pid_t new_value;
      if (flags & CLONE_VM)
        new_value = -1;
      else
        new_value = getpid ();
      THREAD_SETMEM (THREAD_SELF, pid, new_value);
      THREAD_SETMEM (THREAD_SELF, tid, new_value);

    do_syscall:
      [...]

The new approach uses:

   int clone(int (*fn)(void *), void *child_stack, int flags, ...)
      [...]
      if (flags & CLONE_VM)
        goto do_syscall;
      pid_t new_value = getpid ();
      THREAD_SETMEM (THREAD_SELF, pid, new_value);
      THREAD_SETMEM (THREAD_SELF, tid, new_value);

    do_syscall:
      [...]

It also removes the linux tst-getpid2.c test which expects the previous
behavior and instead add another clone test.

Tested on x86_64, i686, x32, powerpc64le, aarch64, armhf, s390, and
s390x. I also did limited check on mips32 and sparc64 (using the new
added test).

I also got reviews from both m68k, hppa, and tile.  So I presume for
these architecture the patch works.

The fixes for alpha, microblaze, sh, ia64, and nio2 have not been
tested.

[1] https://sourceware.org/ml/libc-alpha/2016-04/msg00307.html

	* sysdeps/unix/sysv/linux/Makefile [$(subdir) == nptl] (test): Remove
	tst-getpid2.
	(test): Add tst-clone2.
	* sysdeps/unix/sysv/linux/tst-clone2.c: New file.
	* sysdeps/unix/sysv/linux/aarch64/clone.S (__clone): Do not change
	pid/tid fields for CLONE_VM.
	* sysdeps/unix/sysv/linux/arm/clone.S: Likewise.
	* sysdeps/unix/sysv/linux/i386/clone.S: Likewise.
	* sysdeps/unix/sysv/linux/mips/clone.S: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc32/clone.S: Likewise.
	* sysdeps/unix/sysv/linux/powerpc/powerpc64/clone.S: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-32/clone.S: Likewise.
	* sysdeps/unix/sysv/linux/s390/s390-64/clone.S: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc32/clone.S: Likewise.
	* sysdeps/unix/sysv/linux/sparc/sparc64/clone.S: Likewise.
	* sysdeps/unix/sysv/linux/x86_64/clone.S: Likewise.
	* sysdeps/unix/sysv/linux/tst-getpid2.c: Remove file.
 		2016-04-29 18:19:30 -03:00
..
aarch64 Fix clone (CLONE_VM) pid/tid reset (BZ#19957) 2016-04-29 18:19:30 -03:00
alpha Fix clone (CLONE_VM) pid/tid reset (BZ#19957) 2016-04-29 18:19:30 -03:00
arm Fix clone (CLONE_VM) pid/tid reset (BZ#19957) 2016-04-29 18:19:30 -03:00
bits Fix termios.h XCASE namespace (bug 19925). 2016-04-08 18:16:09 +00:00
generic Consolidate pwrite/pwrite64 implementations 2016-04-11 10:08:01 -03:00
hppa Fix clone (CLONE_VM) pid/tid reset (BZ#19957) 2016-04-29 18:19:30 -03:00
i386 Fix clone (CLONE_VM) pid/tid reset (BZ#19957) 2016-04-29 18:19:30 -03:00
ia64 Fix clone (CLONE_VM) pid/tid reset (BZ#19957) 2016-04-29 18:19:30 -03:00
include/sys Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
m68k Fix clone (CLONE_VM) pid/tid reset (BZ#19957) 2016-04-29 18:19:30 -03:00
microblaze [microblaze] Remove __ASSUME_FUTIMESAT. 2016-03-29 22:13:36 +00:00
mips Fix clone (CLONE_VM) pid/tid reset (BZ#19957) 2016-04-29 18:19:30 -03:00
net Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
netash Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
netatalk Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
netax25 Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
neteconet Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
netinet Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
netipx Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
netiucv Add missing iucv related defines. 2016-04-27 09:08:29 +02:00
netpacket Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
netrom Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
netrose Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
nfs
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nios2 Fix clone (CLONE_VM) pid/tid reset (BZ#19957) 2016-04-29 18:19:30 -03:00
powerpc Fix clone (CLONE_VM) pid/tid reset (BZ#19957) 2016-04-29 18:19:30 -03:00
s390 Fix clone (CLONE_VM) pid/tid reset (BZ#19957) 2016-04-29 18:19:30 -03:00
scsi Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sh Fix clone (CLONE_VM) pid/tid reset (BZ#19957) 2016-04-29 18:19:30 -03:00
sparc Fix clone (CLONE_VM) pid/tid reset (BZ#19957) 2016-04-29 18:19:30 -03:00
sys Synchronize <sys/personality.h> with kernel headers 2016-03-28 22:42:52 +02:00
tile Fix clone (CLONE_VM) pid/tid reset (BZ#19957) 2016-04-29 18:19:30 -03:00
wordsize-64 Consolidate pwrite/pwrite64 implementations 2016-04-11 10:08:01 -03:00
x86 Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
x86_64 Fix clone (CLONE_VM) pid/tid reset (BZ#19957) 2016-04-29 18:19:30 -03:00
Implies
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Makefile Fix clone (CLONE_VM) pid/tid reset (BZ#19957) 2016-04-29 18:19:30 -03:00
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_G_config.h
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configure Remove linux/fanotify.h configure test. 2016-02-24 18:44:10 +00:00
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ppoll.c Remove __ASSUME_PPOLL. 2016-03-15 21:11:07 +00:00
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pwrite.c Consolidate pwrite/pwrite64 implementations 2016-04-11 10:08:01 -03:00
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recvfrom.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
recvmmsg.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
recvmsg.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
remove.c
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sa_len.c
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safe-fatal.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sched_getaffinity.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sched_getcpu.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sched_setaffinity.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
segfault.c
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semctl.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
semget.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
semop.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
semtimedop.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
send.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sendmmsg.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sendmsg.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sendto.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
setegid.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
seteuid.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
setgid.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
setgroups.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sethostid.c
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setipv4sourcefilter.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
setregid.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
setresgid.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
setresuid.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
setreuid.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
setrlimit64.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
setsockopt.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
setsourcefilter.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
setuid.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
shlib-versions
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shm-directory.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
shmat.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
shmctl.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
shmdt.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
shmget.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
shutdown.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sigaction.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
siglist.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
signal.c
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signalfd.c Remove __ASSUME_SIGNALFD4. 2016-03-21 16:30:05 +00:00
sigpending.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sigprocmask.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sigqueue.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sigreturn.c
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sigset-cvt-mask.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sigstack.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sigsuspend.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sigtimedwait.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sigwait.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sigwaitinfo.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sizes.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
socket.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
socketcall.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
socketpair.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
spawni.c posix: Fix posix_spawn implict check style 2016-03-21 12:12:26 -03:00
speed.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
statfs64.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
statvfs.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
statvfs64.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sync_file_range.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
syscalls.list Remove __ASSUME_EVENTFD2, move eventfd to syscalls.list. 2016-03-17 19:07:39 +00:00
sysconf.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sysctl.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sysctl.mk
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sysdep-vdso.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sysdep.h Fix pread consolidation on ports that require argument alignment 2016-04-14 16:49:40 -03:00
syslog.c
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system.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tcdrain.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tcflow.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tcflush.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tcgetattr.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tcgetpgrp.c
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tcsendbrk.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tcsetattr.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tcsetpgrp.c
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termio.h
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time.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
timer_create.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
timer_delete.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
timer_getoverr.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
timer_gettime.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
timer_routines.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
timer_settime.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
times.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
timespec_get.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
truncate64.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tst-affinity-pid.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tst-affinity.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tst-align-clone.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tst-clone.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tst-clone2.c Fix clone (CLONE_VM) pid/tid reset (BZ#19957) 2016-04-29 18:19:30 -03:00
tst-fanotify.c Remove linux/fanotify.h configure test. 2016-02-24 18:44:10 +00:00
tst-getpid1.c
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tst-personality.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tst-setgetname.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tst-skeleton-affinity.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tst-skeleton-thread-affinity.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tst-thread-affinity-pthread.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tst-thread-affinity-pthread2.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
tst-thread-affinity-sched.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
ttyname.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
ttyname_r.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
ualarm.c
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umount.S
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umount2.S
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unlockpt.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
updwtmp.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
ustat.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
utimensat.c Assume __NR_utimensat is always defined 2016-03-23 23:35:08 +01:00
utimes.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
utmp_file.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
vfork.c
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wait.c Remove union wait [BZ #19613] 2016-04-14 08:54:57 +02:00
wait3.c
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waitid.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
waitpid.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
xmknod.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
xmknodat.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
xstat.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
xstat64.c xstat: only check to see if __ASSUME_ST_INO_64_BIT is defined 2016-01-07 14:37:09 -05:00
xstatconv.c xstat: only check to see if __ASSUME_ST_INO_64_BIT is defined 2016-01-07 14:37:09 -05:00
xstatconv.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00