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Mark internal unistd functions with attribute_hidden [BZ #18822]

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Mark internal unistd functions with attribute_hidden to allow direct
access to them within libc.so and libc.a without using GOT nor PLT.

	[BZ #18822]
	* include/unistd.h (__access): Add attribute_hidden.
	(__lseek64): Likewise.
	(__libc_pread64): Likewise.
	(__pipe2): Likewise.
	(__sleep): Likewise.
	(__chdir): Likewise.
	(__fchdir): Likewise.
	(__getcwd): Likewise.
	(__rmdir): Likewise.
	(__execvpe): Likewise.
	(__execve): Likewise.
	(__setsid): Likewise.
	(__getuid): Likewise.
	(__geteuid): Likewise.
	(__getgid): Likewise.
	(__getegid): Likewise.
	(__getgroups): Likewise.
	(__group_member): Likewise.
	(__ttyname_r): Likewise.
	(__isatty): Likewise.
	(__readlink): Likewise.
	(__unlink): Likewise.
	(__gethostname): Likewise.
	(__profil): Likewise.
	(__getdtablesize): Likewise.
	(__brk): Likewise.
	(__ftruncate): Likewise.
	(__ftruncate64): Likewise.
This commit is contained in:
H.J. Lu 2017-10-01 15:11:40 -07:00
parent 8345a76018
commit 7ec4b39ac4
2 changed files with 64 additions and 28 deletions
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32
ChangeLog
View File

@ -1,3 +1,35 @@
2017-10-01 H.J. Lu <hongjiu.lu@intel.com>
[BZ #18822]
* include/unistd.h (__access): Add attribute_hidden.
(__lseek64): Likewise.
(__libc_pread64): Likewise.
(__pipe2): Likewise.
(__sleep): Likewise.
(__chdir): Likewise.
(__fchdir): Likewise.
(__getcwd): Likewise.
(__rmdir): Likewise.
(__execvpe): Likewise.
(__execve): Likewise.
(__setsid): Likewise.
(__getuid): Likewise.
(__geteuid): Likewise.
(__getgid): Likewise.
(__getegid): Likewise.
(__getgroups): Likewise.
(__group_member): Likewise.
(__ttyname_r): Likewise.
(__isatty): Likewise.
(__readlink): Likewise.
(__unlink): Likewise.
(__gethostname): Likewise.
(__profil): Likewise.
(__getdtablesize): Likewise.
(__brk): Likewise.
(__ftruncate): Likewise.
(__ftruncate64): Likewise.
2017-10-01 H.J. Lu <hongjiu.lu@intel.com> 2017-10-01 H.J. Lu <hongjiu.lu@intel.com>
[BZ #18822] [BZ #18822]

60
include/unistd.h
View File

@ -23,9 +23,10 @@ libc_hidden_proto (tcgetpgrp)
libc_hidden_proto (readlinkat) libc_hidden_proto (readlinkat)
/* Now define the internal interfaces. */ /* Now define the internal interfaces. */
extern int __access (const char *__name, int __type); extern int __access (const char *__name, int __type) attribute_hidden;
extern int __euidaccess (const char *__name, int __type); extern int __euidaccess (const char *__name, int __type);
extern __off64_t __lseek64 (int __fd, __off64_t __offset, int __whence); extern __off64_t __lseek64 (int __fd, __off64_t __offset, int __whence)
attribute_hidden;
extern __off_t __lseek (int __fd, __off_t __offset, int __whence); extern __off_t __lseek (int __fd, __off_t __offset, int __whence);
libc_hidden_proto (__lseek) libc_hidden_proto (__lseek)
extern __off_t __libc_lseek (int __fd, __off_t __offset, int __whence); extern __off_t __libc_lseek (int __fd, __off_t __offset, int __whence);
@ -39,7 +40,7 @@ extern ssize_t __pread64 (int __fd, void *__buf, size_t __nbytes,
__off64_t __offset); __off64_t __offset);
libc_hidden_proto (__pread64); libc_hidden_proto (__pread64);
extern ssize_t __libc_pread64 (int __fd, void *__buf, size_t __nbytes, extern ssize_t __libc_pread64 (int __fd, void *__buf, size_t __nbytes,
__off64_t __offset); __off64_t __offset) attribute_hidden;
extern ssize_t __pwrite (int __fd, const void *__buf, size_t __n, extern ssize_t __pwrite (int __fd, const void *__buf, size_t __n,
__off_t __offset); __off_t __offset);
libc_hidden_proto (__pwrite) libc_hidden_proto (__pwrite)
@ -58,8 +59,8 @@ libc_hidden_proto (__libc_write)
libc_hidden_proto (write) libc_hidden_proto (write)
extern int __pipe (int __pipedes[2]); extern int __pipe (int __pipedes[2]);
libc_hidden_proto (__pipe) libc_hidden_proto (__pipe)
extern int __pipe2 (int __pipedes[2], int __flags); extern int __pipe2 (int __pipedes[2], int __flags) attribute_hidden;
extern unsigned int __sleep (unsigned int __seconds); extern unsigned int __sleep (unsigned int __seconds) attribute_hidden;
extern int __chown (const char *__file, extern int __chown (const char *__file,
__uid_t __owner, __gid_t __group); __uid_t __owner, __gid_t __group);
libc_hidden_proto (__chown) libc_hidden_proto (__chown)
@ -67,12 +68,12 @@ extern int __fchown (int __fd,
__uid_t __owner, __gid_t __group); __uid_t __owner, __gid_t __group);
extern int __lchown (const char *__file, __uid_t __owner, extern int __lchown (const char *__file, __uid_t __owner,
__gid_t __group); __gid_t __group);
extern int __chdir (const char *__path); extern int __chdir (const char *__path) attribute_hidden;
extern int __fchdir (int __fd); extern int __fchdir (int __fd) attribute_hidden;
extern char *__getcwd (char *__buf, size_t __size); extern char *__getcwd (char *__buf, size_t __size) attribute_hidden;
extern int __rmdir (const char *__path); extern int __rmdir (const char *__path) attribute_hidden;
extern int __execvpe (const char *file, char *const argv[], extern int __execvpe (const char *file, char *const argv[],
char *const envp[]); char *const envp[]) attribute_hidden;
/* Get the canonical absolute name of the named directory, and put it in SIZE /* Get the canonical absolute name of the named directory, and put it in SIZE
bytes of BUF. Returns NULL if the directory couldn't be determined or bytes of BUF. Returns NULL if the directory couldn't be determined or
@ -91,7 +92,7 @@ libc_hidden_proto (__dup2)
extern int __dup3 (int __fd, int __fd2, int flags); extern int __dup3 (int __fd, int __fd2, int flags);
libc_hidden_proto (__dup3) libc_hidden_proto (__dup3)
extern int __execve (const char *__path, char *const __argv[], extern int __execve (const char *__path, char *const __argv[],
char *const __envp[]); char *const __envp[]) attribute_hidden;
extern long int __pathconf (const char *__path, int __name); extern long int __pathconf (const char *__path, int __name);
extern long int __fpathconf (int __fd, int __name); extern long int __fpathconf (int __fd, int __name);
extern long int __sysconf (int __name); extern long int __sysconf (int __name);
@ -99,14 +100,14 @@ libc_hidden_proto (__sysconf)
extern __pid_t __getpid (void); extern __pid_t __getpid (void);
libc_hidden_proto (__getpid) libc_hidden_proto (__getpid)
extern __pid_t __getppid (void); extern __pid_t __getppid (void);
extern __pid_t __setsid (void); extern __pid_t __setsid (void) attribute_hidden;
extern __uid_t __getuid (void); extern __uid_t __getuid (void) attribute_hidden;
extern __uid_t __geteuid (void); extern __uid_t __geteuid (void) attribute_hidden;
extern __gid_t __getgid (void); extern __gid_t __getgid (void) attribute_hidden;
extern __gid_t __getegid (void); extern __gid_t __getegid (void) attribute_hidden;
extern int __getgroups (int __size, __gid_t __list[]); extern int __getgroups (int __size, __gid_t __list[]) attribute_hidden;
libc_hidden_proto (__getpgid) libc_hidden_proto (__getpgid)
extern int __group_member (__gid_t __gid); extern int __group_member (__gid_t __gid) attribute_hidden;
extern int __setuid (__uid_t __uid); extern int __setuid (__uid_t __uid);
extern int __setreuid (__uid_t __ruid, __uid_t __euid); extern int __setreuid (__uid_t __ruid, __uid_t __euid);
extern int __setgid (__gid_t __gid); extern int __setgid (__gid_t __gid);
@ -123,18 +124,21 @@ libc_hidden_proto (__setresuid)
libc_hidden_proto (__setresgid) libc_hidden_proto (__setresgid)
extern __pid_t __vfork (void); extern __pid_t __vfork (void);
libc_hidden_proto (__vfork) libc_hidden_proto (__vfork)
extern int __ttyname_r (int __fd, char *__buf, size_t __buflen); extern int __ttyname_r (int __fd, char *__buf, size_t __buflen)
extern int __isatty (int __fd); attribute_hidden;
extern int __isatty (int __fd) attribute_hidden;
extern int __link (const char *__from, const char *__to); extern int __link (const char *__from, const char *__to);
extern int __symlink (const char *__from, const char *__to); extern int __symlink (const char *__from, const char *__to);
extern ssize_t __readlink (const char *__path, char *__buf, size_t __len); extern ssize_t __readlink (const char *__path, char *__buf, size_t __len)
extern int __unlink (const char *__name); attribute_hidden;
extern int __gethostname (char *__name, size_t __len); extern int __unlink (const char *__name) attribute_hidden;
extern int __gethostname (char *__name, size_t __len) attribute_hidden;
extern int __revoke (const char *__file); extern int __revoke (const char *__file);
extern int __profil (unsigned short int *__sample_buffer, size_t __size, extern int __profil (unsigned short int *__sample_buffer, size_t __size,
size_t __offset, unsigned int __scale); size_t __offset, unsigned int __scale)
extern int __getdtablesize (void); attribute_hidden;
extern int __brk (void *__addr); extern int __getdtablesize (void) attribute_hidden;
extern int __brk (void *__addr) attribute_hidden;
extern int __close (int __fd); extern int __close (int __fd);
libc_hidden_proto (__close) libc_hidden_proto (__close)
extern int __libc_close (int __fd); extern int __libc_close (int __fd);
@ -146,8 +150,8 @@ extern __pid_t __fork (void);
libc_hidden_proto (__fork) libc_hidden_proto (__fork)
extern int __getpagesize (void) __attribute__ ((__const__)); extern int __getpagesize (void) __attribute__ ((__const__));
libc_hidden_proto (__getpagesize) libc_hidden_proto (__getpagesize)
extern int __ftruncate (int __fd, __off_t __length); extern int __ftruncate (int __fd, __off_t __length) attribute_hidden;
extern int __ftruncate64 (int __fd, __off64_t __length); extern int __ftruncate64 (int __fd, __off64_t __length) attribute_hidden;
extern int __truncate (const char *path, __off_t __length); extern int __truncate (const char *path, __off_t __length);
extern void *__sbrk (intptr_t __delta); extern void *__sbrk (intptr_t __delta);
libc_hidden_proto (__sbrk) libc_hidden_proto (__sbrk)