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/* ld.so error exception allocation and deallocation.
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Copyright (C) 1995-2018 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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<http://www.gnu.org/licenses/>. */
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#include <ldsodefs.h>
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#include <limits.h>
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#include <stdarg.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <string.h>
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#include <unistd.h>
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/* This message we return as a last resort. We define the string in a
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variable since we have to avoid freeing it and so have to enable
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a pointer comparison. See below and in dlfcn/dlerror.c. */
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static const char _dl_out_of_memory[] = "out of memory";
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/* Dummy allocation object used if allocating the message buffer
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fails. */
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static void
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oom_exception (struct dl_exception *exception)
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{
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exception->objname = "";
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exception->errstring = _dl_out_of_memory;
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exception->message_buffer = NULL;
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}
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static void
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__attribute__ ((noreturn))
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length_mismatch (void)
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{
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_dl_fatal_printf ("Fatal error: "
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"length accounting in _dl_exception_create_format\n");
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}
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/* Adjust the message buffer to indicate whether it is possible to
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free it. EXCEPTION->errstring must be a potentially deallocatable
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pointer. */
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static void
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adjust_message_buffer (struct dl_exception *exception)
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{
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/* If the main executable is relocated it means the libc's malloc
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is used. */
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bool malloced = true;
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#ifdef SHARED
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malloced = (GL(dl_ns)[LM_ID_BASE]._ns_loaded != NULL
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&& (GL(dl_ns)[LM_ID_BASE]._ns_loaded->l_relocated != 0));
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#endif
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if (malloced)
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exception->message_buffer = (char *) exception->errstring;
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else
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exception->message_buffer = NULL;
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}
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void
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_dl_exception_create (struct dl_exception *exception, const char *objname,
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const char *errstring)
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{
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if (objname == NULL)
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objname = "";
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size_t len_objname = strlen (objname) + 1;
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size_t len_errstring = strlen (errstring) + 1;
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char *errstring_copy = malloc (len_objname + len_errstring);
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if (errstring_copy != NULL)
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{
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/* Make a copy of the object file name and the error string. */
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exception->objname = memcpy (__mempcpy (errstring_copy,
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errstring, len_errstring),
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objname, len_objname);
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exception->errstring = errstring_copy;
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adjust_message_buffer (exception);
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}
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else
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oom_exception (exception);
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}
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rtld_hidden_def (_dl_exception_create)
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void
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_dl_exception_create_format (struct dl_exception *exception, const char *objname,
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const char *fmt, ...)
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{
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if (objname == NULL)
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objname = "";
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size_t len_objname = strlen (objname) + 1;
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/* Compute the length of the result. Include room for two NUL
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bytes. */
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size_t length = len_objname + 1;
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{
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va_list ap;
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va_start (ap, fmt);
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for (const char *p = fmt; *p != '\0'; ++p)
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if (*p == '%')
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{
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++p;
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switch (*p)
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{
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case 's':
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length += strlen (va_arg (ap, const char *));
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break;
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default:
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/* Assumed to be '%'. */
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++length;
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break;
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}
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}
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else
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++length;
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va_end (ap);
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}
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if (length > PTRDIFF_MAX)
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{
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oom_exception (exception);
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return;
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}
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char *errstring = malloc (length);
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if (errstring == NULL)
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{
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oom_exception (exception);
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return;
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}
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exception->errstring = errstring;
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adjust_message_buffer (exception);
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/* Copy the error message to errstring. */
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{
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/* Next byte to be written in errstring. */
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char *wptr = errstring;
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/* End of the allocated string. */
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char *const end = errstring + length;
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va_list ap;
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va_start (ap, fmt);
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for (const char *p = fmt; *p != '\0'; ++p)
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if (*p == '%')
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{
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++p;
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switch (*p)
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{
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case 's':
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{
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const char *ptr = va_arg (ap, const char *);
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size_t len_ptr = strlen (ptr);
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if (len_ptr > end - wptr)
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length_mismatch ();
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wptr = __mempcpy (wptr, ptr, len_ptr);
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}
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break;
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case '%':
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if (wptr == end)
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length_mismatch ();
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*wptr = '%';
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++wptr;
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break;
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default:
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_dl_fatal_printf ("Fatal error:"
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" invalid format in exception string\n");
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}
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}
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else
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{
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if (wptr == end)
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length_mismatch ();
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*wptr = *p;
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++wptr;
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}
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if (wptr == end)
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length_mismatch ();
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*wptr = '\0';
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++wptr;
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if (len_objname != end - wptr)
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length_mismatch ();
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exception->objname = memcpy (wptr, objname, len_objname);
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}
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}
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rtld_hidden_def (_dl_exception_create_format)
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void
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_dl_exception_free (struct dl_exception *exception)
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{
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free (exception->message_buffer);
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exception->objname = NULL;
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exception->errstring = NULL;
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exception->message_buffer = NULL;
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}
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rtld_hidden_def (_dl_exception_free)
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