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Hide internal sysinfo functions [BZ #18822]

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Hide internal sysinfo functions to allow direct access within libc.so
and libc.a without using GOT nor PLT.

	[BZ #18822]
	* include/sys/sysinfo.h (__get_nprocs_conf): Add
	libc_hidden_proto.
	(__get_nprocs): Likewise.
	(__get_phys_pages): Likewise.
	(__get_avphys_pages): Likewise.
	(__get_child_max): Add attribute_hidden.
	* misc/getsysstats.c (__get_nprocs_conf): Add libc_hidden_def.
	(__get_nprocs): Likewise.
	(__get_phys_pages): Likewise.
	(__get_avphys_pages): Likewise.
	* sysdeps/mach/getsysstats.c (__get_nprocs_conf): Add
	libc_hidden_def.
	(__get_nprocs): Likewise.
	(__get_phys_pages): Likewise.
	(__get_avphys_pages): Likewise.
	* sysdeps/unix/sysv/linux/getsysstats.c (__get_nprocs): Add
	libc_hidden_def.
	(__get_nprocs_conf): Likewise.
	(__get_phys_pages): Likewise.
	(__get_avphys_pages): Likewise.
This commit is contained in:
H.J. Lu 2017-10-01 15:57:00 -07:00
parent 0389a6aaae
commit b5648377d9
5 changed files with 41 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
ChangeLog
View File

@ -1,3 +1,27 @@
2017-10-01 H.J. Lu <hongjiu.lu@intel.com>
[BZ #18822]
* include/sys/sysinfo.h (__get_nprocs_conf): Add
libc_hidden_proto.
(__get_nprocs): Likewise.
(__get_phys_pages): Likewise.
(__get_avphys_pages): Likewise.
(__get_child_max): Add attribute_hidden.
* misc/getsysstats.c (__get_nprocs_conf): Add libc_hidden_def.
(__get_nprocs): Likewise.
(__get_phys_pages): Likewise.
(__get_avphys_pages): Likewise.
* sysdeps/mach/getsysstats.c (__get_nprocs_conf): Add
libc_hidden_def.
(__get_nprocs): Likewise.
(__get_phys_pages): Likewise.
(__get_avphys_pages): Likewise.
* sysdeps/unix/sysv/linux/getsysstats.c (__get_nprocs): Add
libc_hidden_def.
(__get_nprocs_conf): Likewise.
(__get_phys_pages): Likewise.
(__get_avphys_pages): Likewise.
2017-10-01 H.J. Lu <hongjiu.lu@intel.com>
[BZ #18822]

6
include/sys/sysinfo.h
View File

@ -7,18 +7,22 @@
/* Return number of configured processors. */
extern int __get_nprocs_conf (void);
libc_hidden_proto (__get_nprocs_conf)
/* Return number of available processors. */
extern int __get_nprocs (void);
libc_hidden_proto (__get_nprocs)
/* Return number of physical pages of memory in the system. */
extern long int __get_phys_pages (void);
libc_hidden_proto (__get_phys_pages)
/* Return number of available physical pages of memory in the system. */
extern long int __get_avphys_pages (void);
libc_hidden_proto (__get_avphys_pages)
/* Return maximum number of processes this real user ID can have. */
extern long int __get_child_max (void);
extern long int __get_child_max (void) attribute_hidden;
# endif /* !_ISOMAC */
#endif /* sys/sysinfo.h */

4
misc/getsysstats.c
View File

@ -26,6 +26,7 @@ __get_nprocs_conf (void)
/* We don't know how to determine the number. Simply return always 1. */
return 1;
}
libc_hidden_def (__get_nprocs_conf)
weak_alias (__get_nprocs_conf, get_nprocs_conf)
link_warning (get_nprocs_conf, "warning: get_nprocs_conf will always return 1")
@ -38,6 +39,7 @@ __get_nprocs (void)
/* We don't know how to determine the number. Simply return always 1. */
return 1;
}
libc_hidden_def (__get_nprocs)
weak_alias (__get_nprocs, get_nprocs)
link_warning (get_nprocs, "warning: get_nprocs will always return 1")
@ -50,6 +52,7 @@ __get_phys_pages (void)
__set_errno (ENOSYS);
return -1;
}
libc_hidden_def (__get_phys_pages)
weak_alias (__get_phys_pages, get_phys_pages)
stub_warning (get_phys_pages)
@ -62,6 +65,7 @@ __get_avphys_pages (void)
__set_errno (ENOSYS);
return -1;
}
libc_hidden_def (__get_avphys_pages)
weak_alias (__get_avphys_pages, get_avphys_pages)
stub_warning (get_avphys_pages)

4
sysdeps/mach/getsysstats.c
View File

@ -39,6 +39,7 @@ __get_nprocs_conf (void)
return hbi.max_cpus;
}
libc_hidden_def (__get_nprocs_conf)
weak_alias (__get_nprocs_conf, get_nprocs_conf)
/* Return the number of processors currently available on the system. */
@ -58,6 +59,7 @@ __get_nprocs (void)
return hbi.avail_cpus;
}
libc_hidden_def (__get_nprocs)
weak_alias (__get_nprocs, get_nprocs)
/* Return the number of physical pages on the system. */
@ -77,6 +79,7 @@ __get_phys_pages (void)
return hbi.memory_size / __vm_page_size;
}
libc_hidden_def (__get_phys_pages)
weak_alias (__get_phys_pages, get_phys_pages)
/* Return the number of available physical pages */
@ -102,4 +105,5 @@ __get_avphys_pages (void)
return vs.free_count;
}
libc_hidden_def (__get_avphys_pages)
weak_alias (__get_avphys_pages, get_avphys_pages)

4
sysdeps/unix/sysv/linux/getsysstats.c
View File

@ -226,6 +226,7 @@ __get_nprocs (void)
return result;
}
libc_hidden_def (__get_nprocs)
weak_alias (__get_nprocs, get_nprocs)
@ -279,6 +280,7 @@ __get_nprocs_conf (void)
return result;
}
libc_hidden_def (__get_nprocs_conf)
weak_alias (__get_nprocs_conf, get_nprocs_conf)
@ -320,6 +322,7 @@ __get_phys_pages (void)
__sysinfo (&info);
return sysinfo_mempages (info.totalram, info.mem_unit);
}
libc_hidden_def (__get_phys_pages)
weak_alias (__get_phys_pages, get_phys_pages)
long int
@ -330,4 +333,5 @@ __get_avphys_pages (void)
__sysinfo (&info);
return sysinfo_mempages (info.freeram, info.mem_unit);
}
libc_hidden_def (__get_avphys_pages)
weak_alias (__get_avphys_pages, get_avphys_pages)