public inbox for glibc-cvs@sourceware.org help / color / mirror / Atom feed
From: H.J. Lu <hjl@sourceware.org> To: glibc-cvs@sourceware.org Subject: [glibc/release/2.30/master] Add a C wrapper for prctl [BZ #25896] Date: Thu, 7 May 2020 12:25:15 +0000 (GMT) [thread overview] Message-ID: <20200507122515.C93E9395B0B3@sourceware.org> (raw) https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c8e310133748daae298410dea07bbf9244c5407d commit c8e310133748daae298410dea07bbf9244c5407d Author: H.J. Lu <hjl.tools@gmail.com> Date: Thu Apr 30 10:42:43 2020 -0700 Add a C wrapper for prctl [BZ #25896] Add a C wrapper to pass arguments in /* Control process execution. */ extern int prctl (int __option, ...) __THROW; to prctl syscall: extern int prctl (int, unsigned long int, unsigned long int, unsigned long int, unsigned long int); (cherry picked from commit ff026950e280bc3e9487b41b460fb31bc5b57721) Diff: --- include/sys/prctl.h | 1 + sysdeps/unix/sysv/linux/Makefile | 1 + sysdeps/unix/sysv/linux/prctl.c | 42 +++++++++++++++++++++++++++++++++++ sysdeps/unix/sysv/linux/syscalls.list | 1 - 4 files changed, 44 insertions(+), 1 deletion(-) diff --git a/include/sys/prctl.h b/include/sys/prctl.h index 0920ed642b..d33f3a290e 100644 --- a/include/sys/prctl.h +++ b/include/sys/prctl.h @@ -4,6 +4,7 @@ # ifndef _ISOMAC extern int __prctl (int __option, ...); +libc_hidden_proto (__prctl) # endif /* !_ISOMAC */ #endif diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile index 92e0bac384..6add6988ef 100644 --- a/sysdeps/unix/sysv/linux/Makefile +++ b/sysdeps/unix/sysv/linux/Makefile @@ -19,6 +19,7 @@ sysdep_routines += clone umount umount2 readahead \ eventfd eventfd_read eventfd_write prlimit \ personality epoll_wait tee vmsplice splice \ open_by_handle_at mlock2 pkey_mprotect pkey_set pkey_get \ + prctl \ process_vm_readv process_vm_writev CFLAGS-gethostid.c = -fexceptions diff --git a/sysdeps/unix/sysv/linux/prctl.c b/sysdeps/unix/sysv/linux/prctl.c new file mode 100644 index 0000000000..d5725f14cf --- /dev/null +++ b/sysdeps/unix/sysv/linux/prctl.c @@ -0,0 +1,42 @@ +/* prctl - Linux specific syscall. + Copyright (C) 2020 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 + <https://www.gnu.org/licenses/>. */ + +#include <sysdep.h> +#include <stdarg.h> +#include <sys/prctl.h> + +/* Unconditionally read all potential arguments. This may pass + garbage values to the kernel, but avoids the need for teaching + glibc the argument counts of individual options (including ones + that are added to the kernel in the future). */ + +int +__prctl (int option, ...) +{ + va_list arg; + va_start (arg, option); + unsigned long int arg2 = va_arg (arg, unsigned long int); + unsigned long int arg3 = va_arg (arg, unsigned long int); + unsigned long int arg4 = va_arg (arg, unsigned long int); + unsigned long int arg5 = va_arg (arg, unsigned long int); + va_end (arg); + return INLINE_SYSCALL_CALL (prctl, option, arg2, arg3, arg4, arg5); +} + +libc_hidden_def (__prctl) +weak_alias (__prctl, prctl) diff --git a/sysdeps/unix/sysv/linux/syscalls.list b/sysdeps/unix/sysv/linux/syscalls.list index b9067114da..d2adbc5adf 100644 --- a/sysdeps/unix/sysv/linux/syscalls.list +++ b/sysdeps/unix/sysv/linux/syscalls.list @@ -44,7 +44,6 @@ nfsservctl EXTRA nfsservctl i:ipp __compat_nfsservctl nfsservctl@GLIBC_2.0:GLIBC pipe - pipe i:f __pipe pipe pipe2 - pipe2 i:fi __pipe2 pipe2 pivot_root EXTRA pivot_root i:ss pivot_root -prctl EXTRA prctl i:iiiii __prctl prctl query_module EXTRA query_module i:sipip __compat_query_module query_module@GLIBC_2.0:GLIBC_2.23 quotactl EXTRA quotactl i:isip quotactl remap_file_pages - remap_file_pages i:pUiUi __remap_file_pages remap_file_pages
reply other threads:[~2020-05-07 12:25 UTC|newest] Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
Reply instructions: You may reply publicly to this message via plain-text email using any one of the following methods: * Save the following mbox file, import it into your mail client, and reply-to-all from there: mbox Avoid top-posting and favor interleaved quoting: https://en.wikipedia.org/wiki/Posting_style#Interleaved_style * Reply using the --to, --cc, and --in-reply-to switches of git-send-email(1): git send-email \ --in-reply-to=20200507122515.C93E9395B0B3@sourceware.org \ --to=hjl@sourceware.org \ --cc=glibc-cvs@sourceware.org \ /path/to/YOUR_REPLY https://kernel.org/pub/software/scm/git/docs/git-send-email.html * If your mail client supports setting the In-Reply-To header via mailto: links, try the mailto: linkBe sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions for how to clone and mirror all data and code used for this inbox; as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).