-/* Error handling for runtime dynamic linker.
- Copyright (C) 1995-2013 Free Software Foundation, Inc.
+/* Error handling for runtime dynamic linker, full version.
+ Copyright (C) 1995-2019 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
-#include <libintl.h>
-#include <setjmp.h>
-#include <stdbool.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
-#include <ldsodefs.h>
+/* This implementation lives in libc.so because it uses thread-local
+ data, which is not available in ld.so. It interposes the version
+ in dl-error-minimal.c after ld.so bootstrap.
-/* This structure communicates state between _dl_catch_error and
- _dl_signal_error. */
-struct catch
- {
- const char *objname; /* Object/File name. */
- const char *errstring; /* Error detail filled in here. */
- bool malloced; /* Nonzero if the string is malloced
- by the libc malloc. */
- jmp_buf env; /* longjmp here on error. */
- };
+ The signal/catch mechanism is used by the audit framework, which
+ means that even in ld.so, not all errors are fatal. */
-/* Multiple threads at once can use the `_dl_catch_error' function. The
- calls can come from `_dl_map_object_deps', `_dlerror_run', or from
- any of the libc functionality which loads dynamic objects (NSS, iconv).
- Therefore we have to be prepared to save the state in thread-local
- memory. The _dl_error_catch_tsd function pointer is reset by the thread
- library so that it returns the address of a thread-local variable. */
-
-
-/* This message we return as a last resort. We define the string in a
- variable since we have to avoid freeing it and so have to enable
- a pointer comparison. See below and in dlfcn/dlerror.c. */
-static const char _dl_out_of_memory[] = "out of memory";
-
-
-/* This points to a function which is called when an continuable error is
- received. Unlike the handling of `catch' this function may return.
- The arguments will be the `errstring' and `objname'.
-
- Since this functionality is not used in normal programs (only in ld.so)
- we do not care about multi-threaded programs here. We keep this as a
- global variable. */
-static receiver_fct receiver;
-
-#ifdef _LIBC_REENTRANT
-# define CATCH_HOOK (*(struct catch **) (*GL(dl_error_catch_tsd)) ())
-#else
-static struct catch *catch_hook;
-# define CATCH_HOOK catch_hook
-#endif
-
-void
-internal_function
-_dl_signal_error (int errcode, const char *objname, const char *occation,
- const char *errstring)
-{
- struct catch *lcatch;
-
- if (! errstring)
- errstring = N_("DYNAMIC LINKER BUG!!!");
-
- lcatch = CATCH_HOOK;
- if (objname == NULL)
- objname = "";
- if (lcatch != NULL)
- {
- /* We are inside _dl_catch_error. Return to it. We have to
- duplicate the error string since it might be allocated on the
- stack. The object name is always a string constant. */
- size_t len_objname = strlen (objname) + 1;
- size_t len_errstring = strlen (errstring) + 1;
-
- lcatch->errstring = (char *) malloc (len_objname + len_errstring);
- if (lcatch->errstring != NULL)
- {
- /* Make a copy of the object file name and the error string. */
- lcatch->objname = memcpy (__mempcpy ((char *) lcatch->errstring,
- errstring, len_errstring),
- objname, len_objname);
-
- /* If the main executable is relocated it means the libc's malloc
- is used. */
-#ifdef SHARED
- lcatch->malloced = (GL(dl_ns)[LM_ID_BASE]._ns_loaded != NULL
- && (GL(dl_ns)[LM_ID_BASE]._ns_loaded->l_relocated
- != 0));
-#else
- lcatch->malloced = true;
-#endif
- }
- else
- {
- /* This is better than nothing. */
- lcatch->objname = "";
- lcatch->errstring = _dl_out_of_memory;
- lcatch->malloced = false;
- }
- /* We do not restore the signal mask because none was saved. */
- __longjmp (lcatch->env[0].__jmpbuf, errcode ?: -1);
- }
- else
- {
- /* Lossage while resolving the program's own symbols is always fatal. */
- char buffer[1024];
- _dl_fatal_printf ("%s: %s: %s%s%s%s%s\n",
- RTLD_PROGNAME,
- occation ?: N_("error while loading shared libraries"),
- objname, *objname ? ": " : "",
- errstring, errcode ? ": " : "",
- (errcode
- ? __strerror_r (errcode, buffer, sizeof buffer)
- : ""));
- }
-}
-
-
-void
-internal_function
-_dl_signal_cerror (int errcode, const char *objname, const char *occation,
- const char *errstring)
-{
- if (__builtin_expect (GLRO(dl_debug_mask)
- & ~(DL_DEBUG_STATISTICS|DL_DEBUG_PRELINK), 0))
- _dl_debug_printf ("%s: error: %s: %s (%s)\n", objname, occation,
- errstring, receiver ? "continued" : "fatal");
-
- if (receiver)
- {
- /* We are inside _dl_receive_error. Call the user supplied
- handler and resume the work. The receiver will still be
- installed. */
- (*receiver) (errcode, objname, errstring);
- }
- else
- _dl_signal_error (errcode, objname, occation, errstring);
-}
-
-
-int
-internal_function
-_dl_catch_error (const char **objname, const char **errstring,
- bool *mallocedp, void (*operate) (void *), void *args)
-{
- int errcode;
- struct catch *volatile old;
- struct catch c;
- /* We need not handle `receiver' since setting a `catch' is handled
- before it. */
-
- /* Some systems (e.g., SPARC) handle constructors to local variables
- inefficient. So we initialize `c' by hand. */
- c.errstring = NULL;
-
- struct catch **const catchp = &CATCH_HOOK;
- old = *catchp;
- /* Do not save the signal mask. */
- errcode = __sigsetjmp (c.env, 0);
- if (__builtin_expect (errcode, 0) == 0)
- {
- *catchp = &c;
- (*operate) (args);
- *catchp = old;
- *objname = NULL;
- *errstring = NULL;
- *mallocedp = false;
- return 0;
- }
-
- /* We get here only if we longjmp'd out of OPERATE. */
- *catchp = old;
- *objname = c.objname;
- *errstring = c.errstring;
- *mallocedp = c.malloced;
- return errcode == -1 ? 0 : errcode;
-}
-
-
-void
-internal_function
-_dl_receive_error (receiver_fct fct, void (*operate) (void *), void *args)
-{
- struct catch **const catchp = &CATCH_HOOK;
- struct catch *old_catch;
- receiver_fct old_receiver;
-
- old_catch = *catchp;
- old_receiver = receiver;
-
- /* Set the new values. */
- *catchp = NULL;
- receiver = fct;
-
- (*operate) (args);
-
- *catchp = old_catch;
- receiver = old_receiver;
-}
+#define DL_ERROR_BOOTSTRAP 0
+#include "dl-error-skeleton.c"
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