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Mark internal dirent functions with attribute_hidden [BZ #18822]

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Mark internal dirent functions with attribute_hidden to allow direct
access within libc.so and libc.a without using GOT nor PLT.  __readdir64
is hidden with libc_hidden_proto and libc_hidden_def since the exported
readdir64 is an alias of __readdir64.

	[BZ #18822]
	* include/dirent.h (__opendir): Always add attribute_hidden.
	(__fdopendir): Likewise.
	(__closedir): Likewise.
	(__readdir): Likewise.
	(__readdir64): Add libc_hidden_proto.
	* sysdeps/mach/hurd/readdir64.c (__readdir64): Add libc_hidden_def.
	* sysdeps/unix/sysv/linux/i386/readdir64.c (__readdir64): Likewise.
	* sysdeps/unix/sysv/linux/readdir64.c (__readdir64): Likewise.
	* sysdeps/unix/sysv/linux/wordsize-64/readdir.c (__GI___readdir64):
	New alias.
This commit is contained in:
H.J. Lu 2017-10-01 15:50:56 -07:00
parent 9635ce6962
commit 4587a421c5
6 changed files with 23 additions and 8 deletions
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14
ChangeLog
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@ -1,3 +1,17 @@
2017-10-01 H.J. Lu <hongjiu.lu@intel.com>
[BZ #18822]
* include/dirent.h (__opendir): Always add attribute_hidden.
(__fdopendir): Likewise.
(__closedir): Likewise.
(__readdir): Likewise.
(__readdir64): Add libc_hidden_proto.
* sysdeps/mach/hurd/readdir64.c (__readdir64): Add libc_hidden_def.
* sysdeps/unix/sysv/linux/i386/readdir64.c (__readdir64): Likewise.
* sysdeps/unix/sysv/linux/readdir64.c (__readdir64): Likewise.
* sysdeps/unix/sysv/linux/wordsize-64/readdir.c (__GI___readdir64):
New alias.
2017-10-01 H.J. Lu <hongjiu.lu@intel.com>
[BZ #18822]

13
include/dirent.h
View File

@ -15,12 +15,13 @@ struct scandir_cancel_struct
};
/* Now define the internal interfaces. */
extern DIR *__opendir (const char *__name);
extern DIR *__opendir (const char *__name) attribute_hidden;
extern DIR *__opendirat (int dfd, const char *__name) attribute_hidden;
extern DIR *__fdopendir (int __fd);
extern int __closedir (DIR *__dirp);
extern struct dirent *__readdir (DIR *__dirp);
extern DIR *__fdopendir (int __fd) attribute_hidden;
extern int __closedir (DIR *__dirp) attribute_hidden;
extern struct dirent *__readdir (DIR *__dirp) attribute_hidden;
extern struct dirent64 *__readdir64 (DIR *__dirp);
libc_hidden_proto (__readdir64)
extern int __readdir_r (DIR *__dirp, struct dirent *__entry,
struct dirent **__result);
extern int __readdir64_r (DIR *__dirp, struct dirent64 *__entry,
@ -77,10 +78,6 @@ libc_hidden_proto (__scandirat)
libc_hidden_proto (scandirat64)
# if IS_IN (rtld)
extern __typeof (__closedir) __closedir attribute_hidden;
extern __typeof (__fdopendir) __fdopendir attribute_hidden;
extern __typeof (__readdir) __readdir attribute_hidden;
extern __typeof (__readdir64) __readdir64 attribute_hidden;
extern __typeof (__rewinddir) __rewinddir attribute_hidden;
# endif
# endif

1
sysdeps/mach/hurd/readdir64.c
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@ -98,4 +98,5 @@ __readdir64 (DIR *dirp)
return dp;
}
libc_hidden_def (__readdir64)
weak_alias (__readdir64, readdir64)

1
sysdeps/unix/sysv/linux/i386/readdir64.c
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@ -27,6 +27,7 @@
#undef __GETDENTS
#undef DIRENT_TYPE
libc_hidden_def (__readdir64)
versioned_symbol (libc, __readdir64, readdir64, GLIBC_2_2);
#if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_2)

1
sysdeps/unix/sysv/linux/readdir64.c
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@ -4,4 +4,5 @@
#include <sysdeps/posix/readdir.c>
libc_hidden_def (__readdir64)
weak_alias (__readdir64, readdir64)

1
sysdeps/unix/sysv/linux/wordsize-64/readdir.c
View File

@ -3,5 +3,6 @@
#include <sysdeps/posix/readdir.c>
#undef __readdir64
strong_alias (__readdir, __readdir64)
strong_alias (__readdir, __GI___readdir64)
#undef readdir64
weak_alias (__readdir, readdir64)