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ld.so: Add architecture specific fields

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To support Intel Control-flow Enforcement Technology (CET) run-time
control:

1. An architecture specific field in the writable ld.so namespace is
needed to indicate if CET features are enabled at run-time.
2. An architecture specific field in struct link_map is needed if
CET features are enabled in an ELF module.

This patch adds dl-procruntime.c to the writable ld.so namespace and
link_map.h to struct link_map.

Tested with build-many-glibcs.py.

	* elf/dl-support.c: Include <dl-procruntime.c>.
	* include/link.h: Include <link_map.h>.
	* sysdeps/generic/dl-procruntime.c: New file.
	* sysdeps/generic/link_map.h: Likewise.
	* sysdeps/generic/ldsodefs.h: Include <dl-procruntime.c> in
	the writable ld.so namespace.
This commit is contained in:
H.J. Lu 2017-11-13 08:02:39 -08:00
parent e69897bf20
commit 4a306ef1c8
6 changed files with 21 additions and 4 deletions
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9
ChangeLog
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@ -1,3 +1,12 @@
2017-11-13 H.J. Lu <hongjiu.lu@intel.com>
* elf/dl-support.c: Include <dl-procruntime.c>.
* include/link.h: Include <link_map.h>.
* sysdeps/generic/dl-procruntime.c: New file.
* sysdeps/generic/link_map.h: Likewise.
* sysdeps/generic/ldsodefs.h: Include <dl-procruntime.c> in
the writable ld.so namespace.
2017-11-12 Paul Eggert <eggert@cs.ucla.edu>
timezone: pacify GCC -Wstringop-truncation

1
elf/dl-support.c
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@ -126,6 +126,7 @@ int _dl_starting_up = 1;
void *_dl_random;
/* Get architecture specific initializer. */
#include <dl-procruntime.c>
#include <dl-procinfo.c>
/* Initial value of the CPU clock. */

2
include/link.h
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@ -203,6 +203,8 @@ struct link_map
freed, ie. not allocated with
the dummy malloc in ld.so. */
#include <link_map.h>
/* Collected information about own RPATH directories. */
struct r_search_path_struct l_rpath_dirs;

1
sysdeps/generic/dl-procruntime.c Normal file
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@ -0,0 +1 @@
/* No architecture specific definitions. */

11
sysdeps/generic/ldsodefs.h
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@ -373,6 +373,13 @@ struct rtld_global
EXTERN void (*_dl_rtld_unlock_recursive) (void *);
#endif
/* Get architecture specific definitions. */
#define PROCINFO_DECL
#ifndef PROCINFO_CLASS
# define PROCINFO_CLASS EXTERN
#endif
#include <dl-procruntime.c>
/* If loading a shared object requires that we make the stack executable
when it was not, we do it by calling this function.
It returns an errno code or zero on success. */
@ -529,10 +536,6 @@ struct rtld_global_ro
#endif
/* Get architecture specific definitions. */
#define PROCINFO_DECL
#ifndef PROCINFO_CLASS
# define PROCINFO_CLASS EXTERN
#endif
#include <dl-procinfo.c>
/* Names of shared object for which the RPATH should be ignored. */

1
sysdeps/generic/link_map.h Normal file
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@ -0,0 +1 @@
/* No architecture specific definitions. */