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Hide __readv and __writev [BZ #18822]

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

	[BZ #18822]
	* include/sys/uio.h (__readv): Add libc_hidden_proto.
	(__writev): Likewise.
	* misc/readv.c (__readv): Add libc_hidden_def.
	* misc/writev.c (__writev): Likewise.
	* sysdeps/posix/readv.c (__readv): Likewise.
	* sysdeps/posix/writev.c (__writev): Likewise.
	* sysdeps/unix/sysv/linux/readv.c: Include <sys/uio.h>.
	(__readv): Likewise.
	* sysdeps/unix/sysv/linux/writev.c: Include <sys/uio.h>.
	(__writev): Likewise.
This commit is contained in:
H.J. Lu
2017-10-01 15:53:52 -07:00
parent b68f862056
commit d6daff1261
8 changed files with 24 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
ChangeLog
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@ -1,3 +1,17 @@
2017-10-01 H.J. Lu <hongjiu.lu@intel.com>
[BZ #18822]
* include/sys/uio.h (__readv): Add libc_hidden_proto.
(__writev): Likewise.
* misc/readv.c (__readv): Add libc_hidden_def.
* misc/writev.c (__writev): Likewise.
* sysdeps/posix/readv.c (__readv): Likewise.
* sysdeps/posix/writev.c (__writev): Likewise.
* sysdeps/unix/sysv/linux/readv.c: Include <sys/uio.h>.
(__readv): Likewise.
* sysdeps/unix/sysv/linux/writev.c: Include <sys/uio.h>.
(__writev): 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]

2
include/sys/uio.h
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@ -5,8 +5,10 @@
/* Now define the internal interfaces. */ /* Now define the internal interfaces. */
extern ssize_t __readv (int __fd, const struct iovec *__iovec, extern ssize_t __readv (int __fd, const struct iovec *__iovec,
int __count); int __count);
libc_hidden_proto (__readv)
extern ssize_t __writev (int __fd, const struct iovec *__iovec, extern ssize_t __writev (int __fd, const struct iovec *__iovec,
int __count); int __count);
libc_hidden_proto (__writev)
/* Used for p{read,write}{v64}v2 implementation. */ /* Used for p{read,write}{v64}v2 implementation. */
libc_hidden_proto (preadv) libc_hidden_proto (preadv)

1
misc/readv.c
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@ -30,6 +30,7 @@ __readv (int fd, const struct iovec *vector, int count)
__set_errno (ENOSYS); __set_errno (ENOSYS);
return -1; return -1;
} }
libc_hidden_def (__readv)
weak_alias (__readv, readv) weak_alias (__readv, readv)
stub_warning (readv) stub_warning (readv)

1
misc/writev.c
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@ -30,6 +30,7 @@ __writev (int fd, const struct iovec *vector, int count)
__set_errno (ENOSYS); __set_errno (ENOSYS);
return -1; return -1;
} }
libc_hidden_def (__writev)
weak_alias (__writev, writev) weak_alias (__writev, writev)
stub_warning (writev) stub_warning (writev)

1
sysdeps/posix/readv.c
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@ -88,4 +88,5 @@ __readv (int fd, const struct iovec *vector, int count)
return bytes_read; return bytes_read;
} }
libc_hidden_def (__readv)
weak_alias (__readv, readv) weak_alias (__readv, readv)

1
sysdeps/posix/writev.c
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@ -88,4 +88,5 @@ __writev (int fd, const struct iovec *vector, int count)
return bytes_written; return bytes_written;
} }
libc_hidden_def (__writev)
weak_alias (__writev, writev) weak_alias (__writev, writev)

2
sysdeps/unix/sysv/linux/readv.c
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@ -17,6 +17,7 @@
<http://www.gnu.org/licenses/>. */ <http://www.gnu.org/licenses/>. */
#include <unistd.h> #include <unistd.h>
#include <sys/uio.h>
#include <sysdep-cancel.h> #include <sysdep-cancel.h>
ssize_t ssize_t
@ -24,4 +25,5 @@ __readv (int fd, const struct iovec *iov, int iovcnt)
{ {
return SYSCALL_CANCEL (readv, fd, iov, iovcnt); return SYSCALL_CANCEL (readv, fd, iov, iovcnt);
} }
libc_hidden_def (__readv)
weak_alias (__readv, readv) weak_alias (__readv, readv)

2
sysdeps/unix/sysv/linux/writev.c
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@ -17,6 +17,7 @@
<http://www.gnu.org/licenses/>. */ <http://www.gnu.org/licenses/>. */
#include <unistd.h> #include <unistd.h>
#include <sys/uio.h>
#include <sysdep-cancel.h> #include <sysdep-cancel.h>
ssize_t ssize_t
@ -24,4 +25,5 @@ __writev (int fd, const struct iovec *iov, int iovcnt)
{ {
return SYSCALL_CANCEL (writev, fd, iov, iovcnt); return SYSCALL_CANCEL (writev, fd, iov, iovcnt);
} }
libc_hidden_def (__writev)
weak_alias (__writev, writev) weak_alias (__writev, writev)