glibc/sysdeps/unix/sysv/linux/alpha
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
..
alpha
alphaev6/fpu
alphaev67/fpu
bits Fix termios.h XCASE namespace (bug 19925). 2016-04-08 18:16:09 +00:00
fpu
sys Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
____longjmp_chk.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
a.out.h
adjtime.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
aio_cancel.c alpha: Move remaining files out of sysdeps/unix/sysv/linux/alpha/nptl/ 2014-05-23 11:20:48 -07:00
arch-fork.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
brk.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
c++-types.data alpha: Move remaining files out of sysdeps/unix/sysv/linux/alpha/nptl/ 2014-05-23 11:20:48 -07:00
clone.S Fix clone (CLONE_VM) pid/tid reset (BZ#19957) 2016-04-29 18:19:30 -03:00
configure
configure.ac
creat.c Remove __libc_creat function name. 2014-10-30 19:44:31 +00:00
dl-auxv.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
dl-brk.S
dl-fxstatat64.c Remove __ASSUME_ATFCTS conditionals in sysdeps/unix/sysv/linux/. 2014-06-20 15:41:35 +00:00
dl-support.c
dl-sysdep.c
fraiseexcpt.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
fstatfs64.c
fstatvfs64.c
fstatvfs.c
fxstat.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
fxstatat.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
getclktck.c
getcontext.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
getdents64.c
getdents.c
gethostname.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
getsysstats.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
glob.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
ieee_get_fp_control.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
ieee_set_fp_control.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
Implies NPTL is no longer an add-on! 2014-07-07 09:29:06 -07:00
internal_statvfs64.c
ioperm.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
ipc_priv.h
kernel_sigaction.h
kernel_stat.h
kernel_sysinfo.h
kernel_termios.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
kernel-features.h Adjust kernel-features.h defaults for socket syscalls. 2016-03-15 21:09:33 +00:00
ld.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libanl.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libBrokenLocale.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libc.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libcrypt.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libdl.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libm.abilist Fix lgamma setting signgam for ISO C (bug 15421). 2015-11-20 22:49:59 +00:00
libnsl.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libpthread.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libresolv.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
librt.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libthread_db.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
libutil.abilist Simplify the abilist format 2015-11-06 13:58:53 +01:00
localplt.data Run check-localpltk/textrel/execstack over ld.so. 2014-11-06 15:48:44 -05:00
lxstat.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
makecontext.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
Makefile alpha: drop __ASSUME_FDATASYNC 2015-09-17 23:19:10 -04:00
msgctl.c
nldbl-abi.h
oldglob.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
pipe.S
pt-vfork.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
register-dump.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
rt_sigaction.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
semctl.c
setcontext.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
setfpucw.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
shlib-versions Remove configuration name patterns from shlib-versions. 2014-09-12 12:28:47 +00:00
shmctl.c
sigaction.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sigcontextinfo.h 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
sigsuspend.S 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
statfs64.c
statvfs64.c
statvfs.c
swapcontext.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
syscall.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
syscalls.list alpha: Consolidate NPTL/non versions of vfork 2014-05-23 11:20:44 -07:00
sysconf.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sysdep-cancel.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
sysdep.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
timer_create.c alpha: Move remaining files out of sysdeps/unix/sysv/linux/alpha/nptl/ 2014-05-23 11:20:48 -07:00
timer_delete.c alpha: Move remaining files out of sysdeps/unix/sysv/linux/alpha/nptl/ 2014-05-23 11:20:48 -07:00
timer_getoverr.c alpha: Move remaining files out of sysdeps/unix/sysv/linux/alpha/nptl/ 2014-05-23 11:20:48 -07:00
timer_gettime.c alpha: Move remaining files out of sysdeps/unix/sysv/linux/alpha/nptl/ 2014-05-23 11:20:48 -07:00
timer_settime.c alpha: Move remaining files out of sysdeps/unix/sysv/linux/alpha/nptl/ 2014-05-23 11:20:48 -07:00
ucontext-offsets.sym
Versions alpha: Move remaining files out of sysdeps/unix/sysv/linux/alpha/nptl/ 2014-05-23 11:20:48 -07:00
vfork.S Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
wordexp.c
xstat.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
xstatconv.c Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00
xstatconv.h Update copyright dates with scripts/update-copyrights. 2016-01-04 16:05:18 +00:00