From 5fb7fc96350575c9adb1316833e48ca11553be49 Mon Sep 17 00:00:00 2001 From: Adhemerval Zanella Date: Wed, 24 Oct 2018 16:29:38 -0300 Subject: [PATCH] posix: Use posix_spawn on system This patch uses posix_spawn on system implementation. On Linux this has the advantage of much lower memory consumption (usually 32 Kb minimum for the mmap stack area). Although POSIX does not require, glibc system implementation aims to be thread and cancellation safe. The cancellation code is moved to generic implementation and enabled iff SIGCANCEL is defined (similar on how the cancellation handler is enabled on nptl-init.c). Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu, arm-linux-gnueabihf, and powerpc64le-linux-gnu. * sysdeps/unix/sysv/linux/spawni.c (__spawni_child): Use __sigismember instead of sigismember. * sysdeps/posix/system.c [SIGCANCEL] (cancel_handler_args, cancel_handler): New definitions. (CLEANUP_HANDLER, CLEANUP_RESET): Likewise. (DO_LOCK, DO_UNLOCK, INIT_LOCK, ADD_REF, SUB_REF): Remove. (do_system): Use posix_spawn instead of fork and execl and remove reentracy code. * sysdeps/generic/not-errno.h (__kill_noerrno): New prototype. * sysdeps/unix/sysv/linux/not-errno.h (__kill_noerrno): Likewise. * sysdeps/unix/sysv/linux/ia64/system.c: Remove file. * sysdeps/unix/sysv/linux/s390/system.c: Likewise. * sysdeps/unix/sysv/linux/sparc/system.c: Likewise. * sysdeps/unix/sysv/linux/system.c: Likewise. --- ChangeLog | 13 ++ sysdeps/generic/not-errno.h | 2 + sysdeps/posix/system.c | 189 +++++++++++++------------ sysdeps/unix/sysv/linux/ia64/system.c | 30 ---- sysdeps/unix/sysv/linux/not-errno.h | 14 ++ sysdeps/unix/sysv/linux/s390/system.c | 29 ---- sysdeps/unix/sysv/linux/sparc/system.c | 29 ---- sysdeps/unix/sysv/linux/spawni.c | 4 +- sysdeps/unix/sysv/linux/system.c | 76 ---------- 9 files changed, 131 insertions(+), 255 deletions(-) delete mode 100644 sysdeps/unix/sysv/linux/ia64/system.c delete mode 100644 sysdeps/unix/sysv/linux/s390/system.c delete mode 100644 sysdeps/unix/sysv/linux/sparc/system.c delete mode 100644 sysdeps/unix/sysv/linux/system.c diff --git a/ChangeLog b/ChangeLog index 70bd1a37af..a8590b22a3 100644 --- a/ChangeLog +++ b/ChangeLog @@ -1,5 +1,18 @@ 2018-11-28 Adhemerval Zanella + * sysdeps/unix/sysv/linux/spawni.c (__spawni_child): Use + __sigismember instead of sigismember. + * sysdeps/posix/system.c [SIGCANCEL] (cancel_handler_args, + cancel_handler): New definitions. + (do_system): Use posix_spawn instead of fork and execl and remove + reentracy code. + * sysdeps/generic/not-errno.h (__kill_noerrno): New prototype. + * sysdeps/unix/sysv/linux/not-errno.h (__kill_noerrno): Likewise. + * sysdeps/unix/sysv/linux/ia64/system.c: Remove file. + * sysdeps/unix/sysv/linux/s390/system.c: Likewise. + * sysdeps/unix/sysv/linux/sparc/system.c: Likewise. + * sysdeps/unix/sysv/linux/system.c: Likewise. + [BZ #22834] [BZ #17490] * NEWS: Add new semantic for atfork with popen and system. diff --git a/sysdeps/generic/not-errno.h b/sysdeps/generic/not-errno.h index 93617a3266..0fd66b5c5e 100644 --- a/sysdeps/generic/not-errno.h +++ b/sysdeps/generic/not-errno.h @@ -17,3 +17,5 @@ . */ extern __typeof (__access) __access_noerrno attribute_hidden; + +extern __typeof (__kill) __kill_noerrno attribute_hidden; diff --git a/sysdeps/posix/system.c b/sysdeps/posix/system.c index d7594436ed..8a51a6b991 100644 --- a/sysdeps/posix/system.c +++ b/sysdeps/posix/system.c @@ -17,20 +17,36 @@ #include #include -#include #include #include +#include +#include +#include #include #include -#include -#include -#include +#include +#include +#include +#include +#include #define SHELL_PATH "/bin/sh" /* Path of the shell. */ #define SHELL_NAME "sh" /* Name to give it. */ +/* This system implementation aims to be thread-safe, which requires to + restore the signal dispositions for SIGINT and SIGQUIT correctly and to + deal with cancellation by terminating the child process. + + The signal disposition restoration on the single-thread case is + straighfoward. For multithreaded case, a reference-counter with a lock + is used, so the first thread will set the SIGINT/SIGQUIT dispositions and + last thread will restore them. + + Cancellation handling is done with thread cancellation clean-up handlers + on waitpid call. */ + #ifdef _LIBC_REENTRANT static struct sigaction intr, quit; static int sa_refcntr; @@ -50,17 +66,45 @@ __libc_lock_define_initialized (static, lock); #endif +#if defined(_LIBC_REENTRANT) && defined(SIGCANCEL) +struct cancel_handler_args +{ + struct sigaction *quit; + struct sigaction *intr; + pid_t pid; +}; + +static void +cancel_handler (void *arg) +{ + struct cancel_handler_args *args = (struct cancel_handler_args *) (arg); + + __kill_noerrno (args->pid, SIGKILL); + + TEMP_FAILURE_RETRY (__waitpid_nocancel (args->pid, NULL, 0)); + + DO_LOCK (); + if (SUB_REF () == 0) + { + __sigaction (SIGQUIT, args->quit, NULL); + __sigaction (SIGINT, args->intr, NULL); + } + DO_UNLOCK (); +} +#endif + /* Execute LINE as a shell command, returning its status. */ static int do_system (const char *line) { - int status, save; + int status; pid_t pid; struct sigaction sa; #ifndef _LIBC_REENTRANT struct sigaction intr, quit; #endif sigset_t omask; + sigset_t reset; sa.sa_handler = SIG_IGN; sa.sa_flags = 0; @@ -69,105 +113,72 @@ do_system (const char *line) DO_LOCK (); if (ADD_REF () == 0) { - if (__sigaction (SIGINT, &sa, &intr) < 0) - { - (void) SUB_REF (); - goto out; - } - if (__sigaction (SIGQUIT, &sa, &quit) < 0) - { - save = errno; - (void) SUB_REF (); - goto out_restore_sigint; - } + /* sigaction can not fail with SIGINT/SIGQUIT used with SIG_IGN. */ + __sigaction (SIGINT, &sa, &intr); + __sigaction (SIGQUIT, &sa, &quit); } DO_UNLOCK (); - /* We reuse the bitmap in the 'sa' structure. */ __sigaddset (&sa.sa_mask, SIGCHLD); - save = errno; - if (__sigprocmask (SIG_BLOCK, &sa.sa_mask, &omask) < 0) + /* sigprocmask can not fail with SIG_BLOCK used with valid input + arguments. */ + __sigprocmask (SIG_BLOCK, &sa.sa_mask, &omask); + + __sigemptyset (&reset); + if (intr.sa_handler != SIG_IGN) + __sigaddset(&reset, SIGINT); + if (quit.sa_handler != SIG_IGN) + __sigaddset(&reset, SIGQUIT); + + posix_spawnattr_t spawn_attr; + /* None of the posix_spawnattr_* function returns an error, including + posix_spawnattr_setflags for the follow specific usage (using valid + flags). */ + __posix_spawnattr_init (&spawn_attr); + __posix_spawnattr_setsigmask (&spawn_attr, &omask); + __posix_spawnattr_setsigdefault (&spawn_attr, &reset); + __posix_spawnattr_setflags (&spawn_attr, + POSIX_SPAWN_SETSIGDEF | POSIX_SPAWN_SETSIGMASK); + + status = __posix_spawn (&pid, SHELL_PATH, 0, &spawn_attr, + (char *const[]){ (char*) SHELL_NAME, + (char*) "-c", + (char *) line, NULL }, + __environ); + __posix_spawnattr_destroy (&spawn_attr); + + if (status == 0) { -#ifndef _LIBC - if (errno == ENOSYS) - __set_errno (save); - else + /* Cancellation results in cleanup handlers running as exceptions in + the block where they were installed, so it is safe to reference + stack variable allocate in the broader scope. */ +#if defined(_LIBC_REENTRANT) && defined(SIGCANCEL) + struct cancel_handler_args cancel_args = + { + .quit = &quit, + .intr = &intr, + .pid = pid + }; + __libc_cleanup_region_start (1, cancel_handler, &cancel_args); #endif - { - DO_LOCK (); - if (SUB_REF () == 0) - { - save = errno; - (void) __sigaction (SIGQUIT, &quit, (struct sigaction *) NULL); - out_restore_sigint: - (void) __sigaction (SIGINT, &intr, (struct sigaction *) NULL); - __set_errno (save); - } - out: - DO_UNLOCK (); - return -1; - } - } - -#ifdef CLEANUP_HANDLER - CLEANUP_HANDLER; -#endif - -#ifdef FORK - pid = FORK (); -#else - pid = __fork (); -#endif - if (pid == (pid_t) 0) - { - /* Child side. */ - const char *new_argv[4]; - new_argv[0] = SHELL_NAME; - new_argv[1] = "-c"; - new_argv[2] = line; - new_argv[3] = NULL; - - /* Restore the signals. */ - (void) __sigaction (SIGINT, &intr, (struct sigaction *) NULL); - (void) __sigaction (SIGQUIT, &quit, (struct sigaction *) NULL); - (void) __sigprocmask (SIG_SETMASK, &omask, (sigset_t *) NULL); - INIT_LOCK (); - - /* Exec the shell. */ - (void) __execve (SHELL_PATH, (char *const *) new_argv, __environ); - _exit (127); - } - else if (pid < (pid_t) 0) - /* The fork failed. */ - status = -1; - else - /* Parent side. */ - { /* Note the system() is a cancellation point. But since we call waitpid() which itself is a cancellation point we do not have to do anything here. */ if (TEMP_FAILURE_RETRY (__waitpid (pid, &status, 0)) != pid) status = -1; +#if defined(_LIBC_REENTRANT) && defined(SIGCANCEL) + __libc_cleanup_region_end (0); +#endif } -#ifdef CLEANUP_HANDLER - CLEANUP_RESET; -#endif - - save = errno; DO_LOCK (); - if ((SUB_REF () == 0 - && (__sigaction (SIGINT, &intr, (struct sigaction *) NULL) - | __sigaction (SIGQUIT, &quit, (struct sigaction *) NULL)) != 0) - || __sigprocmask (SIG_SETMASK, &omask, (sigset_t *) NULL) != 0) + if (SUB_REF () == 0) { -#ifndef _LIBC - /* glibc cannot be used on systems without waitpid. */ - if (errno == ENOSYS) - __set_errno (save); - else -#endif - status = -1; + /* sigaction can not fail with SIGINT/SIGQUIT used with old + disposition. Same applies for sigprocmask. */ + __sigaction (SIGINT, &intr, NULL); + __sigaction (SIGQUIT, &quit, NULL); + __sigprocmask (SIG_SETMASK, &omask, NULL); } DO_UNLOCK (); diff --git a/sysdeps/unix/sysv/linux/ia64/system.c b/sysdeps/unix/sysv/linux/ia64/system.c deleted file mode 100644 index d09fefefe6..0000000000 --- a/sysdeps/unix/sysv/linux/ia64/system.c +++ /dev/null @@ -1,30 +0,0 @@ -/* Copyright (C) 2002-2018 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - . */ - -/* We have to and actually can handle cancelable system(). The big - problem: we have to kill the child process if necessary. To do - this a cleanup handler has to be registered and is has to be able - to find the PID of the child. The main problem is to reliable have - the PID when needed. It is not necessary for the parent thread to - return. It might still be in the kernel when the cancellation - request comes. Therefore we have to use the clone() calls ability - to have the kernel write the PID into the user-level variable. */ -#define FORK() \ - INLINE_SYSCALL (clone2, 6, CLONE_PARENT_SETTID | SIGCHLD, NULL, 0, \ - &pid, NULL, NULL) - -#include diff --git a/sysdeps/unix/sysv/linux/not-errno.h b/sysdeps/unix/sysv/linux/not-errno.h index 106ba5c72e..b2f72cfb3d 100644 --- a/sysdeps/unix/sysv/linux/not-errno.h +++ b/sysdeps/unix/sysv/linux/not-errno.h @@ -16,6 +16,9 @@ License along with the GNU C Library; if not, see . */ +#include +#include + /* This function is used on maybe_enable_malloc_check (elf/dl-tunables.c) and to avoid having to build/use multiple versions if stack protection in enabled it is defined as inline. */ @@ -33,3 +36,14 @@ __access_noerrno (const char *pathname, int mode) return INTERNAL_SYSCALL_ERRNO (res, err); return 0; } + +static inline int +__kill_noerrno (pid_t pid, int sig) +{ + int res; + INTERNAL_SYSCALL_DECL (err); + res = INTERNAL_SYSCALL_CALL (kill, err, pid, sig); + if (INTERNAL_SYSCALL_ERROR_P (res, err)) + return INTERNAL_SYSCALL_ERRNO (res, err); + return 0; +} diff --git a/sysdeps/unix/sysv/linux/s390/system.c b/sysdeps/unix/sysv/linux/s390/system.c deleted file mode 100644 index d8ef461334..0000000000 --- a/sysdeps/unix/sysv/linux/s390/system.c +++ /dev/null @@ -1,29 +0,0 @@ -/* Copyright (C) 2003-2018 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - . */ - -/* We have to and actually can handle cancelable system(). The big - problem: we have to kill the child process if necessary. To do - this a cleanup handler has to be registered and is has to be able - to find the PID of the child. The main problem is to reliable have - the PID when needed. It is not necessary for the parent thread to - return. It might still be in the kernel when the cancellation - request comes. Therefore we have to use the clone() calls ability - to have the kernel write the PID into the user-level variable. */ -#define FORK() \ - INLINE_SYSCALL (clone, 3, 0, CLONE_PARENT_SETTID | SIGCHLD, &pid) - -#include "../system.c" diff --git a/sysdeps/unix/sysv/linux/sparc/system.c b/sysdeps/unix/sysv/linux/sparc/system.c deleted file mode 100644 index 1f65c83399..0000000000 --- a/sysdeps/unix/sysv/linux/sparc/system.c +++ /dev/null @@ -1,29 +0,0 @@ -/* Copyright (C) 2003-2018 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - . */ - -/* We have to and actually can handle cancelable system(). The big - problem: we have to kill the child process if necessary. To do - this a cleanup handler has to be registered and is has to be able - to find the PID of the child. The main problem is to reliable have - the PID when needed. It is not necessary for the parent thread to - return. It might still be in the kernel when the cancellation - request comes. Therefore we have to use the clone() calls ability - to have the kernel write the PID into the user-level variable. */ -#define FORK() \ - INLINE_CLONE_SYSCALL (CLONE_PARENT_SETTID | SIGCHLD, 0, &pid, NULL, NULL) - -#include "../system.c" diff --git a/sysdeps/unix/sysv/linux/spawni.c b/sysdeps/unix/sysv/linux/spawni.c index 9f3a137b5c..dbb6cdd5f0 100644 --- a/sysdeps/unix/sysv/linux/spawni.c +++ b/sysdeps/unix/sysv/linux/spawni.c @@ -138,11 +138,11 @@ __spawni_child (void *arguments) for (int sig = 1; sig < _NSIG; ++sig) { if ((attr->__flags & POSIX_SPAWN_SETSIGDEF) - && sigismember (&attr->__sd, sig)) + && __sigismember (&attr->__sd, sig)) { sa.sa_handler = SIG_DFL; } - else if (sigismember (&hset, sig)) + else if (__sigismember (&hset, sig)) { if (__is_internal_signal (sig)) sa.sa_handler = SIG_IGN; diff --git a/sysdeps/unix/sysv/linux/system.c b/sysdeps/unix/sysv/linux/system.c deleted file mode 100644 index 7cc68a1528..0000000000 --- a/sysdeps/unix/sysv/linux/system.c +++ /dev/null @@ -1,76 +0,0 @@ -/* Copyright (C) 2002-2018 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, see - . */ - -#include -#include -#include /* For the real memset prototype. */ -#include -#include -#include -#include - -/* We have to and actually can handle cancelable system(). The big - problem: we have to kill the child process if necessary. To do - this a cleanup handler has to be registered and is has to be able - to find the PID of the child. The main problem is to reliable have - the PID when needed. It is not necessary for the parent thread to - return. It might still be in the kernel when the cancellation - request comes. Therefore we have to use the clone() calls ability - to have the kernel write the PID into the user-level variable. */ -#ifndef FORK -# define FORK() \ - INLINE_SYSCALL (clone, 3, CLONE_PARENT_SETTID | SIGCHLD, 0, &pid) -#endif - -#ifdef _LIBC_REENTRANT -static void cancel_handler (void *arg); - -# define CLEANUP_HANDLER \ - __libc_cleanup_region_start (1, cancel_handler, &pid) - -# define CLEANUP_RESET \ - __libc_cleanup_region_end (0) -#endif - - -/* Linux has waitpid(), so override the generic unix version. */ -#include - - -#ifdef _LIBC_REENTRANT -/* The cancellation handler. */ -static void -cancel_handler (void *arg) -{ - pid_t child = *(pid_t *) arg; - - INTERNAL_SYSCALL_DECL (err); - INTERNAL_SYSCALL (kill, err, 2, child, SIGKILL); - - TEMP_FAILURE_RETRY (__waitpid (child, NULL, 0)); - - DO_LOCK (); - - if (SUB_REF () == 0) - { - (void) __sigaction (SIGQUIT, &quit, (struct sigaction *) NULL); - (void) __sigaction (SIGINT, &intr, (struct sigaction *) NULL); - } - - DO_UNLOCK (); -} -#endif