mirror of
https://sourceware.org/git/glibc.git
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9ff72da471
This patch implements a new posix_spawn{p} implementation for Linux. The main
difference is it uses the clone syscall directly with CLONE_VM and CLONE_VFORK
flags and a direct allocated stack. The new stack and start function solves
most the vfork limitation (possible parent clobber due stack spilling). The
remaning issue are related to signal handling:
1. That no signal handlers must run in child context, to avoid corrupt
parent's state.
2. Child must synchronize with parent to enforce stack deallocation and
to possible return execv issues.
The first one is solved by blocking all signals in child, even NPTL-internal
ones (SIGCANCEL and SIGSETXID). The second issue is done by a stack allocation
in parent and a synchronization with using a pipe or waitpid (in case or error).
The pipe has the advantage of allowing the child signal an exec error (checked
with new tst-spawn2 test).
There is an inherent race condition in pipe2 usage for architectures that do not
support the syscall directly. In such cases the a pipe plus fctnl is used
instead and it may lead to file descriptor leak in parent (as decribed by fcntl
documentation).
The child process stack is allocate with a mmap with MAP_STACK flag using
default architecture stack size. Although it is slower than use a stack buffer
from parent, it allows some slack for the compatibility code to run scripts
with no shebang (which may use a buffer with size depending of argument list
count).
Performance should be similar to the vfork default posix implementation and
way faster than fork path (vfork on mostly linux ports are basically
clone with CLONE_VM plus CLONE_VFORK). The only difference is the syscalls
required for the stack allocation/deallocation.
It fixes BZ#10354, BZ#14750, and BZ#18433.
Tested on i386, x86_64, powerpc64le, and aarch64.
[BZ #14750]
[BZ #10354]
[BZ #18433]
* include/sched.h (__clone): Add hidden prototype.
(__clone2): Likewise.
* include/unistd.h (__dup): Likewise.
* posix/Makefile (tests): Add tst-spawn2.
* posix/tst-spawn2.c: New file.
* sysdeps/posix/dup.c (__dup): Add hidden definition.
* sysdeps/unix/sysv/linux/aarch64/clone.S (__clone): Likewise.
* sysdeps/unix/sysv/linux/alpha/clone.S (__clone): Likewise.
* sysdeps/unix/sysv/linux/arm/clone.S (__clone): Likewise.
* sysdeps/unix/sysv/linux/hppa/clone.S (__clone): Likewise.
* sysdeps/unix/sysv/linux/i386/clone.S (__clone): Likewise.
* sysdeps/unix/sysv/linux/ia64/clone2.S (__clone): Likewise.
* sysdeps/unix/sysv/linux/m68k/clone.S (__clone): Likewise.
* sysdeps/unix/sysv/linux/microblaze/clone.S (__clone): Likewise.
* sysdeps/unix/sysv/linux/mips/clone.S (__clone): Likewise.
* sysdeps/unix/sysv/linux/nios2/clone.S (__clone): Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc32/clone.S (__clone):
Likewise.
* sysdeps/unix/sysv/linux/powerpc/powerpc64/clone.S (__clone):
Likewise.
* sysdeps/unix/sysv/linux/s390/s390-32/clone.S (__clone): Likewise.
* sysdeps/unix/sysv/linux/s390/s390-64/clone.S (__clone): Likewise.
* sysdeps/unix/sysv/linux/sh/clone.S (__clone): Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc32/clone.S (__clone): Likewise.
* sysdeps/unix/sysv/linux/sparc/sparc64/clone.S (__clone): Likewise.
* sysdeps/unix/sysv/linux/tile/clone.S (__clone): Likewise.
* sysdeps/unix/sysv/linux/x86_64/clone.S (__clone): Likewise.
* sysdeps/unix/sysv/linux/nptl-signals.h
(____nptl_is_internal_signal): New function.
* sysdeps/unix/sysv/linux/spawni.c: New file.
367 lines
14 KiB
Makefile
367 lines
14 KiB
Makefile
# Copyright (C) 1991-2016 Free Software Foundation, Inc.
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# This file is part of the GNU C Library.
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# The GNU C Library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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# The GNU C Library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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# You should have received a copy of the GNU Lesser General Public
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# License along with the GNU C Library; if not, see
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# <http://www.gnu.org/licenses/>.
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#
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# Sub-makefile for POSIX portion of the library.
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#
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subdir := posix
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include ../Makeconfig
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headers := sys/utsname.h sys/times.h sys/wait.h sys/types.h unistd.h \
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glob.h regex.h wordexp.h fnmatch.h getopt.h \
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bits/types.h bits/typesizes.h bits/pthreadtypes.h \
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bits/posix1_lim.h bits/posix2_lim.h bits/posix_opt.h \
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bits/local_lim.h tar.h bits/utsname.h bits/confname.h \
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bits/waitflags.h bits/waitstatus.h sys/unistd.h sched.h \
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bits/sched.h re_comp.h wait.h bits/environments.h cpio.h \
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sys/sysmacros.h spawn.h bits/unistd.h
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routines := \
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uname \
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times \
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wait waitpid wait3 wait4 waitid \
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alarm sleep pause nanosleep \
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fork vfork _exit \
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execve fexecve execv execle execl execvp execlp execvpe \
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getpid getppid \
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getuid geteuid getgid getegid getgroups setuid setgid group_member \
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getpgid setpgid getpgrp bsd-getpgrp setpgrp getsid setsid \
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getresuid getresgid setresuid setresgid \
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pathconf sysconf fpathconf \
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glob glob64 fnmatch regex \
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confstr \
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getopt getopt1 getopt_init \
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sched_setp sched_getp sched_sets sched_gets sched_yield sched_primax \
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sched_primin sched_rr_gi sched_getaffinity sched_setaffinity \
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getaddrinfo gai_strerror wordexp \
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pread pwrite pread64 pwrite64 \
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spawn_faction_init spawn_faction_destroy spawn_faction_addclose \
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spawn_faction_addopen spawn_faction_adddup2 spawn_valid_fd \
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spawnattr_init spawnattr_destroy \
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spawnattr_getdefault spawnattr_setdefault \
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spawnattr_getflags spawnattr_setflags \
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spawnattr_getpgroup spawnattr_setpgroup spawn spawnp spawni \
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spawnattr_getsigmask spawnattr_getschedpolicy spawnattr_getschedparam \
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spawnattr_setsigmask spawnattr_setschedpolicy spawnattr_setschedparam \
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posix_madvise \
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get_child_max sched_cpucount sched_cpualloc sched_cpufree
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aux := init-posix environ
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tests := tstgetopt testfnm runtests runptests \
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tst-preadwrite tst-preadwrite64 test-vfork regexbug1 \
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tst-mmap tst-mmap-offset tst-getaddrinfo tst-truncate \
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tst-truncate64 tst-fork tst-fnmatch tst-regexloc tst-dir \
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tst-chmod bug-regex1 bug-regex2 bug-regex3 bug-regex4 \
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tst-gnuglob tst-regex bug-regex5 bug-regex6 bug-regex7 \
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bug-regex8 bug-regex9 bug-regex10 bug-regex11 bug-regex12 \
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bug-regex13 bug-regex14 bug-regex15 bug-regex16 \
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bug-regex17 bug-regex18 bug-regex19 bug-regex20 \
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bug-regex21 bug-regex22 bug-regex23 bug-regex24 \
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bug-regex25 bug-regex26 bug-regex27 bug-regex28 \
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bug-regex29 bug-regex30 bug-regex31 bug-regex32 \
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bug-regex33 tst-nice tst-nanosleep tst-regex2 \
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transbug tst-rxspencer tst-pcre tst-boost \
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bug-ga1 tst-vfork1 tst-vfork2 tst-vfork3 tst-waitid \
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tst-getaddrinfo2 bug-glob1 bug-glob2 bug-glob3 tst-sysconf \
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tst-execvp1 tst-execvp2 tst-execlp1 tst-execlp2 \
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tst-execv1 tst-execv2 tst-execl1 tst-execl2 \
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tst-execve1 tst-execve2 tst-execle1 tst-execle2 \
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tst-execvp3 tst-execvp4 tst-rfc3484 tst-rfc3484-2 \
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tst-execvpe1 tst-execvpe2 tst-execvpe3 tst-execvpe4 \
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tst-execvpe5 tst-execvpe6 \
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tst-rfc3484-3 \
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tst-getaddrinfo3 tst-fnmatch2 tst-cpucount tst-cpuset \
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bug-getopt1 bug-getopt2 bug-getopt3 bug-getopt4 \
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bug-getopt5 tst-getopt_long1 bug-regex34 bug-regex35 \
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tst-pathconf tst-getaddrinfo4 tst-rxspencer-no-utf8 \
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tst-fnmatch3 bug-regex36 tst-getaddrinfo5 \
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tst-posix_spawn-fd
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xtests := bug-ga2
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ifeq (yes,$(build-shared))
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test-srcs := globtest
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tests += wordexp-test tst-exec tst-spawn tst-spawn2
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endif
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tests-static = tst-exec-static tst-spawn-static
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tests += $(tests-static)
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others := getconf
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install-bin := getconf
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install-others-programs := $(inst_libexecdir)/getconf
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before-compile += testcases.h ptestcases.h $(objpfx)posix-conf-vars-def.h
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# So they get cleaned up.
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generated += $(addprefix wordexp-test-result, 1 2 3 4 5 6 7 8 9 10) \
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annexc annexc.out wordexp-tst.out bug-regex2-mem.out \
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bug-regex2.mtrace bug-regex14-mem.out bug-regex14.mtrace \
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bug-regex21-mem.out bug-regex21.mtrace \
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bug-regex31-mem.out bug-regex31.mtrace \
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tst-rxspencer-no-utf8-mem.out tst-rxspencer-no-utf8.mtrace \
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tst-getconf.out \
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tst-pcre-mem.out tst-pcre.mtrace tst-boost-mem.out \
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tst-boost.mtrace bug-ga2.mtrace bug-ga2-mem.out \
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bug-glob2.mtrace bug-glob2-mem.out tst-vfork3-mem.out \
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tst-vfork3.mtrace getconf.speclist tst-fnmatch-mem.out \
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tst-fnmatch.mtrace bug-regex36.mtrace
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ifeq ($(run-built-tests),yes)
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ifeq (yes,$(build-shared))
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tests-special += $(objpfx)globtest.out $(objpfx)wordexp-tst.out
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endif
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endif
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# Run a test on the header files we use.
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# XXX Please note that for now we ignore the result of this test.
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tests-special += $(objpfx)annexc.out
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ifeq ($(run-built-tests),yes)
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tests-special += $(objpfx)bug-regex2-mem.out $(objpfx)bug-regex14-mem.out \
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$(objpfx)bug-regex21-mem.out $(objpfx)bug-regex31-mem.out \
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$(objpfx)tst-rxspencer-no-utf8-mem.out $(objpfx)tst-pcre-mem.out \
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$(objpfx)tst-boost-mem.out $(objpfx)tst-getconf.out \
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$(objpfx)bug-glob2-mem.out $(objpfx)tst-vfork3-mem.out \
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$(objpfx)tst-fnmatch-mem.out $(objpfx)bug-regex36-mem.out
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xtests-special += $(objpfx)bug-ga2-mem.out
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endif
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include ../Rules
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ifeq ($(run-built-tests),yes)
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# globtest and wordexp-test currently only works with shared libraries
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ifeq (yes,$(build-shared))
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$(objpfx)globtest.out: globtest.sh $(objpfx)globtest
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$(SHELL) $< $(common-objpfx) '$(test-via-rtld-prefix)' \
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'$(test-program-prefix)' '$(test-wrapper-env)'; \
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$(evaluate-test)
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$(objpfx)wordexp-tst.out: wordexp-tst.sh $(objpfx)wordexp-test
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$(SHELL) $< $(common-objpfx) '$(test-program-prefix-before-env)' \
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'$(run-program-env)' '$(test-program-prefix-after-env)'; \
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$(evaluate-test)
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endif
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LOCALES := cs_CZ.UTF-8 da_DK.ISO-8859-1 de_DE.ISO-8859-1 de_DE.UTF-8 \
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en_US.UTF-8 es_US.ISO-8859-1 es_US.UTF-8 ja_JP.EUC-JP tr_TR.UTF-8
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include ../gen-locales.mk
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$(objpfx)bug-regex1.out: $(gen-locales)
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$(objpfx)bug-regex4.out: $(gen-locales)
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$(objpfx)bug-regex5.out: $(gen-locales)
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$(objpfx)bug-regex6.out: $(gen-locales)
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$(objpfx)bug-regex17.out: $(gen-locales)
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$(objpfx)bug-regex18.out: $(gen-locales)
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$(objpfx)bug-regex19.out: $(gen-locales)
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$(objpfx)bug-regex20.out: $(gen-locales)
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$(objpfx)bug-regex22.out: $(gen-locales)
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$(objpfx)bug-regex23.out: $(gen-locales)
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$(objpfx)bug-regex25.out: $(gen-locales)
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$(objpfx)bug-regex26.out: $(gen-locales)
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$(objpfx)bug-regex30.out: $(gen-locales)
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$(objpfx)bug-regex32.out: $(gen-locales)
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$(objpfx)bug-regex33.out: $(gen-locales)
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$(objpfx)bug-regex34.out: $(gen-locales)
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$(objpfx)bug-regex35.out: $(gen-locales)
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$(objpfx)tst-fnmatch.out: $(gen-locales)
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$(objpfx)tst-fnmatch4.out: $(gen-locales)
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$(objpfx)tst-fnmatch5.out: $(gen-locales)
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$(objpfx)tst-regex.out: $(gen-locales)
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$(objpfx)tst-regex2.out: $(gen-locales)
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$(objpfx)tst-regexloc.out: $(gen-locales)
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$(objpfx)tst-rxspencer.out: $(gen-locales)
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$(objpfx)tst-rxspencer-no-utf8.out: $(gen-locales)
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endif
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# If we will use the generic uname implementation, we must figure out what
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# it will say by examining the system, and write the results in config-name.h.
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uname.c: $(objpfx)config-name.h
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$(objpfx)config-name.h: $(..)scripts/config-uname.sh $(common-objpfx)config.make
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$(make-target-directory)
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$< '$(config-os)' '$(config-release)' \
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'$(config-machine)-$(config-vendor)' > $@.new
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mv -f $@.new $@
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CFLAGS-getaddrinfo.c = -DRESOLVER -fexceptions
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CFLAGS-pause.c = -fexceptions -fasynchronous-unwind-tables
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CFLAGS-pread.c = -fexceptions -fasynchronous-unwind-tables
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CFLAGS-pread64.c = -fexceptions -fasynchronous-unwind-tables
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CFLAGS-pwrite.c = -fexceptions -fasynchronous-unwind-tables
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CFLAGS-pwrite64.c = -fexceptions -fasynchronous-unwind-tables
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CFLAGS-sleep.c = -fexceptions
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CFLAGS-wait.c = -fexceptions -fasynchronous-unwind-tables
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CFLAGS-waitid.c = -fexceptions -fasynchronous-unwind-tables
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CFLAGS-waitpid.c = -fexceptions -fasynchronous-unwind-tables
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CFLAGS-getopt.c = -fexceptions
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CFLAGS-wordexp.c = -fexceptions
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CFLAGS-wordexp.os = -fomit-frame-pointer
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CFLAGS-sysconf.c = -fexceptions -DGETCONF_DIR='"$(libexecdir)/getconf"'
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CFLAGS-pathconf.c = -fexceptions
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CFLAGS-fpathconf.c = -fexceptions
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CFLAGS-spawn.c = -fexceptions
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CFLAGS-spawn.os = -fomit-frame-pointer
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CFLAGS-spawnp.c = -fexceptions
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CFLAGS-spawnp.os = -fomit-frame-pointer
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CFLAGS-spawni.c = -fexceptions
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CFLAGS-spawni.os = -fomit-frame-pointer
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CFLAGS-pause.c = -fexceptions
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CFLAGS-glob.c = $(uses-callbacks) -fexceptions
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CFLAGS-glob64.c = $(uses-callbacks) -fexceptions
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CFLAGS-getconf.c = -DGETCONF_DIR='"$(libexecdir)/getconf"'
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CFLAGS-execve.os = -fomit-frame-pointer
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CFLAGS-fexecve.os = -fomit-frame-pointer
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CFLAGS-execv.os = -fomit-frame-pointer
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CFLAGS-execle.os = -fomit-frame-pointer
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CFLAGS-execl.os = -fomit-frame-pointer
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CFLAGS-execvp.os = -fomit-frame-pointer
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CFLAGS-execlp.os = -fomit-frame-pointer
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tstgetopt-ARGS = -a -b -cfoobar --required foobar --optional=bazbug \
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--none random --col --color --colour
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tst-exec-ARGS = -- $(host-test-program-cmd)
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tst-exec-static-ARGS = $(tst-exec-ARGS)
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tst-execvpe5-ARGS = -- $(host-test-program-cmd)
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tst-spawn-ARGS = -- $(host-test-program-cmd)
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tst-spawn-static-ARGS = $(tst-spawn-ARGS)
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tst-dir-ARGS = `pwd` `cd $(common-objdir)/$(subdir); pwd` `cd $(common-objdir); pwd` $(objpfx)tst-dir
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tst-chmod-ARGS = $(objdir)
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tst-vfork3-ARGS = --test-dir=$(objpfx)
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tst-rxspencer-ARGS = --utf8 rxspencer/tests
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tst-rxspencer-no-utf8-ARGS = rxspencer/tests
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tst-pcre-ARGS = PCRE.tests
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tst-boost-ARGS = BOOST.tests
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bug-glob1-ARGS = "$(objpfx)"
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tst-execvp3-ARGS = --test-dir=$(objpfx)
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testcases.h: TESTS TESTS2C.sed
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LC_ALL=C sed -f TESTS2C.sed < $< > $@T
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mv -f $@T $@
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ptestcases.h: PTESTS PTESTS2C.sed
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LC_ALL=C sed -f PTESTS2C.sed < $< > $@T
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mv -f $@T $@
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test-xfail-annexc = yes
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$(objpfx)annexc.out: $(objpfx)annexc
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$(dir $<)$(notdir $<) '$(CC)' \
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'$(patsubst %,-I../%,$(sorted-subdirs)) -I../include $(+sysdep-includes) $(sysincludes) -I..' > $@; \
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$(evaluate-test)
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annexc-CFLAGS = -O
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$(objpfx)annexc: annexc.c
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$(native-compile)
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tst-fnmatch-ENV += MALLOC_TRACE=$(objpfx)tst-fnmatch.mtrace
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$(objpfx)tst-fnmatch-mem.out: $(objpfx)tst-fnmatch.out
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$(common-objpfx)malloc/mtrace $(objpfx)tst-fnmatch.mtrace > $@; \
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$(evaluate-test)
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bug-regex2-ENV = MALLOC_TRACE=$(objpfx)bug-regex2.mtrace
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$(objpfx)bug-regex2-mem.out: $(objpfx)bug-regex2.out
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$(common-objpfx)malloc/mtrace $(objpfx)bug-regex2.mtrace > $@; \
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$(evaluate-test)
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bug-regex14-ENV = MALLOC_TRACE=$(objpfx)bug-regex14.mtrace
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$(objpfx)bug-regex14-mem.out: $(objpfx)bug-regex14.out
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$(common-objpfx)malloc/mtrace $(objpfx)bug-regex14.mtrace > $@; \
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$(evaluate-test)
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bug-regex21-ENV = MALLOC_TRACE=$(objpfx)bug-regex21.mtrace
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$(objpfx)bug-regex21-mem.out: $(objpfx)bug-regex21.out
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$(common-objpfx)malloc/mtrace $(objpfx)bug-regex21.mtrace > $@; \
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$(evaluate-test)
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bug-regex31-ENV = MALLOC_TRACE=$(objpfx)bug-regex31.mtrace
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$(objpfx)bug-regex31-mem.out: $(objpfx)bug-regex31.out
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$(common-objpfx)malloc/mtrace $(objpfx)bug-regex31.mtrace > $@; \
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$(evaluate-test)
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bug-regex36-ENV = MALLOC_TRACE=$(objpfx)bug-regex36.mtrace
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$(objpfx)bug-regex36-mem.out: $(objpfx)bug-regex36.out
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$(common-objpfx)malloc/mtrace $(objpfx)bug-regex36.mtrace > $@; \
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$(evaluate-test)
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tst-vfork3-ENV = MALLOC_TRACE=$(objpfx)tst-vfork3.mtrace
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$(objpfx)tst-vfork3-mem.out: $(objpfx)tst-vfork3.out
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$(common-objpfx)malloc/mtrace $(objpfx)tst-vfork3.mtrace > $@; \
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$(evaluate-test)
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# tst-rxspencer.mtrace is not generated, only
|
|
# tst-rxspencer-no-utf8.mtrace, since otherwise the file has almost
|
|
# 100M and takes very long time to process.
|
|
tst-rxspencer-no-utf8-ENV += MALLOC_TRACE=$(objpfx)tst-rxspencer-no-utf8.mtrace
|
|
$(objpfx)tst-rxspencer-no-utf8-mem.out: $(objpfx)tst-rxspencer-no-utf8.out
|
|
$(common-objpfx)malloc/mtrace $(objpfx)tst-rxspencer-no-utf8.mtrace \
|
|
> $@; \
|
|
$(evaluate-test)
|
|
|
|
tst-pcre-ENV = MALLOC_TRACE=$(objpfx)tst-pcre.mtrace
|
|
$(objpfx)tst-pcre-mem.out: $(objpfx)tst-pcre.out
|
|
$(common-objpfx)malloc/mtrace $(objpfx)tst-pcre.mtrace > $@; \
|
|
$(evaluate-test)
|
|
|
|
tst-boost-ENV = MALLOC_TRACE=$(objpfx)tst-boost.mtrace
|
|
$(objpfx)tst-boost-mem.out: $(objpfx)tst-boost.out
|
|
$(common-objpfx)malloc/mtrace $(objpfx)tst-boost.mtrace > $@; \
|
|
$(evaluate-test)
|
|
|
|
$(objpfx)tst-getconf.out: tst-getconf.sh $(objpfx)getconf
|
|
$(SHELL) $< $(common-objpfx) '$(built-program-cmd)'; \
|
|
$(evaluate-test)
|
|
|
|
$(objpfx)bug-ga2-mem.out: $(objpfx)bug-ga2.out
|
|
$(common-objpfx)malloc/mtrace $(objpfx)bug-ga2.mtrace > $@; \
|
|
$(evaluate-test)
|
|
|
|
bug-ga2-ENV = MALLOC_TRACE=$(objpfx)bug-ga2.mtrace
|
|
|
|
bug-glob2-ENV = MALLOC_TRACE=$(objpfx)bug-glob2.mtrace
|
|
|
|
$(objpfx)bug-glob2-mem.out: $(objpfx)bug-glob2.out
|
|
$(common-objpfx)malloc/mtrace $(objpfx)bug-glob2.mtrace > $@; \
|
|
$(evaluate-test)
|
|
|
|
$(inst_libexecdir)/getconf: $(inst_bindir)/getconf \
|
|
$(objpfx)getconf.speclist FORCE
|
|
$(addprefix $(..)./scripts/mkinstalldirs ,\
|
|
$(filter-out $(wildcard $@),$@))
|
|
while read spec; do \
|
|
ln -f $< $@/$$spec.new || $(INSTALL_PROGRAM) $< $@/$$spec.new; \
|
|
mv -f $@/$$spec.new $@/$$spec; \
|
|
done < $(objpfx)getconf.speclist
|
|
|
|
$(objpfx)getconf.speclist: getconf-speclist.c posix-envs.def
|
|
$(compile.c) -E -o - \
|
|
| sed -n -e '/@@@PRESENT_/s/@@@PRESENT_//p' > $@.new
|
|
mv -f $@.new $@
|
|
|
|
# This file is only actually needed at install time. But forcing it to
|
|
# be built both makes it available for eyeball inspection and avoids the
|
|
# surprise of things that look like compilation being done by 'make install'.
|
|
others: $(objpfx)getconf.speclist
|
|
|
|
$(objpfx)posix-conf-vars-def.h: $(..)scripts/gen-posix-conf-vars.awk \
|
|
posix-conf-vars.list Makefile
|
|
$(make-target-directory)
|
|
$(AWK) -f $(filter-out Makefile, $^) > $@.tmp
|
|
mv -f $@.tmp $@
|