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3020f72618
Instead of using a special ELF section along with a linker script directive to put the IO vtables within the RELRO section, the libio vtables are all moved to an array marked as data.relro (so linker will place in the RELRO segment without the need of extra directives). To avoid static linking namespace issues and including all vtable referenced objects, all required function pointers are set to weak alias. Checked on x86_64-linux-gnu, i686-linux-gnu, and aarch64-linux-gnu. Reviewed-by: Carlos O'Donell <carlos@redhat.com>
109 lines
3.6 KiB
C
109 lines
3.6 KiB
C
/* Copyright (C) 1993-2023 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>.
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As a special exception, if you link the code in this file with
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files compiled with a GNU compiler to produce an executable,
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that does not cause the resulting executable to be covered by
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the GNU Lesser General Public License. This exception does not
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however invalidate any other reasons why the executable file
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might be covered by the GNU Lesser General Public License.
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This exception applies to code released by its copyright holders
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in files containing the exception. */
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#ifndef STRFILE_H_
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#define STRFILE_H_
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#include "libioP.h"
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typedef void *(*_IO_alloc_type) (size_t);
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typedef void (*_IO_free_type) (void*);
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struct _IO_str_fields
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{
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/* These members are preserved for ABI compatibility. The glibc
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implementation always calls malloc/free for user buffers if
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_IO_USER_BUF or _IO_FLAGS2_USER_WBUF are not set. */
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_IO_alloc_type _allocate_buffer_unused;
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_IO_free_type _free_buffer_unused;
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};
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/* This is needed for the Irix6 N32 ABI, which has a 64 bit off_t type,
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but a 32 bit pointer type. In this case, we get 4 bytes of padding
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after the vtable pointer. Putting them in a structure together solves
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this problem. */
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struct _IO_streambuf
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{
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FILE _f;
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const struct _IO_jump_t *vtable;
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};
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typedef struct _IO_strfile_
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{
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struct _IO_streambuf _sbf;
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struct _IO_str_fields _s;
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} _IO_strfile;
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/* frozen: set when the program has requested that the array object not
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be altered, reallocated, or freed. */
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#define _IO_STR_FROZEN(FP) ((FP)->_f._flags & _IO_USER_BUF)
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typedef struct
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{
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_IO_strfile f;
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/* This is used for the characters which do not fit in the buffer
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provided by the user. */
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char overflow_buf[64];
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} _IO_strnfile;
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typedef struct
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{
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_IO_strfile f;
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/* This is used for the characters which do not fit in the buffer
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provided by the user. */
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wchar_t overflow_buf[64];
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} _IO_wstrnfile;
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/* Initialize an _IO_strfile SF to read from narrow string STRING, and
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return the corresponding FILE object. It is not necessary to fclose
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the FILE when it is no longer needed. */
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static inline FILE *
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_IO_strfile_read (_IO_strfile *sf, const char *string)
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{
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sf->_sbf._f._lock = NULL;
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_IO_no_init (&sf->_sbf._f, _IO_USER_LOCK, -1, NULL, NULL);
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_IO_JUMPS (&sf->_sbf) = &_IO_str_jumps;
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_IO_str_init_static_internal (sf, (char*)string, 0, NULL);
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return &sf->_sbf._f;
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}
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/* Initialize an _IO_strfile SF and _IO_wide_data WD to read from wide
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string STRING, and return the corresponding FILE object. It is not
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necessary to fclose the FILE when it is no longer needed. */
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static inline FILE *
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_IO_strfile_readw (_IO_strfile *sf, struct _IO_wide_data *wd,
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const wchar_t *string)
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{
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sf->_sbf._f._lock = NULL;
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_IO_no_init (&sf->_sbf._f, _IO_USER_LOCK, 0, wd, &_IO_wstr_jumps);
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_IO_fwide (&sf->_sbf._f, 1);
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_IO_wstr_init_static (&sf->_sbf._f, (wchar_t *)string, 0, NULL);
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return &sf->_sbf._f;
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}
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#endif /* strfile.h. */
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