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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>
120 lines
3.2 KiB
C
120 lines
3.2 KiB
C
/* Copyright (C) 1995-2023 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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#include "libioP.h"
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#include "strfile.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <wchar.h>
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struct _IO_FILE_wmemstream
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{
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_IO_strfile _sf;
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wchar_t **bufloc;
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size_t *sizeloc;
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};
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/* Open a stream that writes into a malloc'd buffer that is expanded as
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necessary. *BUFLOC and *SIZELOC are updated with the buffer's location
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and the number of characters written on fflush or fclose. */
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FILE *
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open_wmemstream (wchar_t **bufloc, size_t *sizeloc)
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{
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struct locked_FILE
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{
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struct _IO_FILE_wmemstream fp;
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#ifdef _IO_MTSAFE_IO
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_IO_lock_t lock;
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#endif
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struct _IO_wide_data wd;
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} *new_f;
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wchar_t *buf;
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new_f = (struct locked_FILE *) malloc (sizeof (struct locked_FILE));
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if (new_f == NULL)
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return NULL;
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#ifdef _IO_MTSAFE_IO
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new_f->fp._sf._sbf._f._lock = &new_f->lock;
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#endif
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buf = calloc (1, BUFSIZ);
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if (buf == NULL)
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{
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free (new_f);
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return NULL;
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}
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_IO_no_init (&new_f->fp._sf._sbf._f, 0, 0, &new_f->wd, &_IO_wmem_jumps);
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_IO_fwide (&new_f->fp._sf._sbf._f, 1);
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_IO_wstr_init_static (&new_f->fp._sf._sbf._f, buf,
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BUFSIZ / sizeof (wchar_t), buf);
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new_f->fp._sf._sbf._f._flags2 &= ~_IO_FLAGS2_USER_WBUF;
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new_f->fp._sf._s._allocate_buffer_unused = (_IO_alloc_type) malloc;
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new_f->fp._sf._s._free_buffer_unused = (_IO_free_type) free;
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new_f->fp.bufloc = bufloc;
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new_f->fp.sizeloc = sizeloc;
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/* Disable single thread optimization. BZ 21735. */
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new_f->fp._sf._sbf._f._flags2 |= _IO_FLAGS2_NEED_LOCK;
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return (FILE *) &new_f->fp._sf._sbf;
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}
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int
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_IO_wmem_sync (FILE *fp)
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{
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struct _IO_FILE_wmemstream *mp = (struct _IO_FILE_wmemstream *) fp;
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if (fp->_wide_data->_IO_write_ptr == fp->_wide_data->_IO_write_end)
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{
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_IO_wstr_overflow (fp, '\0');
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--fp->_wide_data->_IO_write_ptr;
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}
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*mp->bufloc = fp->_wide_data->_IO_write_base;
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*mp->sizeloc = (fp->_wide_data->_IO_write_ptr
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- fp->_wide_data->_IO_write_base);
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return 0;
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}
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void
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_IO_wmem_finish (FILE *fp, int dummy)
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{
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struct _IO_FILE_wmemstream *mp = (struct _IO_FILE_wmemstream *) fp;
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*mp->bufloc = (wchar_t *) realloc (fp->_wide_data->_IO_write_base,
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(fp->_wide_data->_IO_write_ptr
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- fp->_wide_data->_IO_write_base + 1)
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* sizeof (wchar_t));
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if (*mp->bufloc != NULL)
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{
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size_t len = (fp->_wide_data->_IO_write_ptr
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- fp->_wide_data->_IO_write_base);
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(*mp->bufloc)[len] = '\0';
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*mp->sizeloc = len;
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fp->_wide_data->_IO_buf_base = NULL;
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}
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_IO_wstr_finish (fp, 0);
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}
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