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Add a C wrapper for prctl [BZ #25896]

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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);
This commit is contained in:
H.J. Lu 2020-04-30 10:42:43 -07:00
parent 051be01f6b
commit ff026950e2
4 changed files with 44 additions and 2 deletions
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1
include/sys/prctl.h
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@ -4,6 +4,7 @@
# ifndef _ISOMAC # ifndef _ISOMAC
extern int __prctl (int __option, ...); extern int __prctl (int __option, ...);
libc_hidden_proto (__prctl)
# endif /* !_ISOMAC */ # endif /* !_ISOMAC */
#endif #endif

2
sysdeps/unix/sysv/linux/Makefile
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@ -59,7 +59,7 @@ sysdep_routines += adjtimex clone umount umount2 readahead sysctl \
eventfd eventfd_read eventfd_write prlimit \ eventfd eventfd_read eventfd_write prlimit \
personality epoll_wait tee vmsplice splice \ personality epoll_wait tee vmsplice splice \
open_by_handle_at mlock2 pkey_mprotect pkey_set pkey_get \ open_by_handle_at mlock2 pkey_mprotect pkey_set pkey_get \
timerfd_gettime timerfd_settime \ timerfd_gettime timerfd_settime prctl \
process_vm_readv process_vm_writev process_vm_readv process_vm_writev
CFLAGS-gethostid.c = -fexceptions CFLAGS-gethostid.c = -fexceptions

42
sysdeps/unix/sysv/linux/prctl.c Normal file
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@ -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)

1
sysdeps/unix/sysv/linux/syscalls.list
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@ -43,7 +43,6 @@ nfsservctl EXTRA nfsservctl i:ipp __compat_nfsservctl nfsservctl@GLIBC_2.0:GLIBC
pipe - pipe i:f __pipe pipe pipe - pipe i:f __pipe pipe
pipe2 - pipe2 i:fi __pipe2 pipe2 pipe2 - pipe2 i:fi __pipe2 pipe2
pivot_root EXTRA pivot_root i:ss pivot_root 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 query_module EXTRA query_module i:sipip __compat_query_module query_module@GLIBC_2.0:GLIBC_2.23
quotactl EXTRA quotactl i:isip quotactl quotactl EXTRA quotactl i:isip quotactl
remap_file_pages - remap_file_pages i:pUiUi __remap_file_pages remap_file_pages remap_file_pages - remap_file_pages i:pUiUi __remap_file_pages remap_file_pages