malloc: Check for large bin list corruption when inserting unsorted chunk

[thirdparty/glibc.git] / include / dlfcn.h

diff --git a/include/dlfcn.h b/include/dlfcn.h
index 9144dd2f3fb368d30a4e68eaf5dc4cf33f7ddded..0dc57dbe2217cfe77e5621026a264f6776b4f8e8 100644 (file)
--- a/include/dlfcn.h
+++ b/include/dlfcn.h
@@ -1,5 +1,6 @@
 #ifndef _DLFCN_H
 #include <dlfcn/dlfcn.h>
+#ifndef _ISOMAC
 #include <link.h>              /* For ElfW.  */
 #include <stdbool.h>
 
@@ -9,6 +10,8 @@
 #define __RTLD_OPENEXEC        0x20000000
 #define __RTLD_CALLMAP 0x10000000
 #define __RTLD_AUDIT   0x08000000
+#define __RTLD_SECURE  0x04000000 /* Apply additional security checks.  */
+#define __RTLD_NOIFUNC 0x02000000 /* Suppress calling ifunc functions.  */
 
 #define __LM_ID_CALLER -2
 
@@ -28,59 +31,72 @@ extern char **__libc_argv attribute_hidden;
 
 /* Now define the internal interfaces.  */
 
+/* Use RTLD_NOW here because:
+   1. In pthread_cancel_init we want to use RTLD_NOW to reduce the stack usage
+      of future cancellation operations, particularly when the target thread
+      is running with a small stack.  Likewise for consistency we do the same
+      thing in __libgcc_s_init.  RTLD_NOW will rarely make a difference for
+      __libgcc_s_init because unwinding is already in progress, so libgcc_s.so
+      has already been loaded if its unwinder is used (Bug 22636).
+   2. It allows us to provide robust fallback code at dlopen time for
+      incorrectly configured systems that mix old libnss_* modules with newly
+      installed libraries e.g. old libnss_nis.so.2 with new libnsl.so.1.  Using
+      RTLD_LAZY here causes a failure at the time the symbol is called and at
+      that point it is much harder to safely return an error (Bug 22766).
+
+   The use of RTLD_NOW also impacts gconv module loading, backtracing
+   (where the unwinder form libgcc_s.so is used), and IDNA functions
+   (which load libidn2), all of which load their respective DSOs on
+   demand, and so should not impact program startup.  That is to say
+   that the DSOs are loaded as part of an API call and therefore we
+   will be calling that family of API functions shortly so RTLD_NOW or
+   RTLD_LAZY is not a big difference in performance, but RTLD_NOW has
+   better error handling semantics for the library.  */
 #define __libc_dlopen(name) \
-  __libc_dlopen_mode (name, RTLD_LAZY | __RTLD_DLOPEN)
-extern void *__libc_dlopen_mode  (__const char *__name, int __mode);
-extern void *__libc_dlsym   (void *__map, __const char *__name);
+  __libc_dlopen_mode (name, RTLD_NOW | __RTLD_DLOPEN)
+extern void *__libc_dlopen_mode  (const char *__name, int __mode);
+extern void *__libc_dlsym   (void *__map, const char *__name);
+extern void *__libc_dlvsym (void *map, const char *name, const char *version);
 extern int   __libc_dlclose (void *__map);
 libc_hidden_proto (__libc_dlopen_mode)
 libc_hidden_proto (__libc_dlsym)
+libc_hidden_proto (__libc_dlvsym)
 libc_hidden_proto (__libc_dlclose)
 
 /* Locate shared object containing the given address.  */
 #ifdef ElfW
 extern int _dl_addr (const void *address, Dl_info *info,
-                    struct link_map **mapp, const ElfW(Sym) **symbolp)
-     internal_function;
+                    struct link_map **mapp, const ElfW(Sym) **symbolp);
 libc_hidden_proto (_dl_addr)
 #endif
 
+struct link_map;
+
 /* Close an object previously opened by _dl_open.  */
 extern void _dl_close (void *map) attribute_hidden;
+/* Same as above, but without locking and safety checks for user
+   provided map arguments.  */
+extern void _dl_close_worker (struct link_map *map, bool force)
+    attribute_hidden;
 
 /* Look up NAME in shared object HANDLE (which may be RTLD_DEFAULT or
    RTLD_NEXT).  WHO is the calling function, for RTLD_NEXT.  Returns
    the symbol value, which may be NULL.  */
-extern void *_dl_sym (void *handle, const char *name, void *who)
-    internal_function;
+extern void *_dl_sym (void *handle, const char *name, void *who);
 
 /* Look up version VERSION of symbol NAME in shared object HANDLE
    (which may be RTLD_DEFAULT or RTLD_NEXT).  WHO is the calling
    function, for RTLD_NEXT.  Returns the symbol value, which may be
    NULL.  */
 extern void *_dl_vsym (void *handle, const char *name, const char *version,
-                      void *who)
-    internal_function;
-
-/* Call OPERATE, catching errors from `dl_signal_error'.  If there is no
-   error, *ERRSTRING is set to null.  If there is an error, *ERRSTRING is
-   set to a string constructed from the strings passed to _dl_signal_error,
-   and the error code passed is the return value and *OBJNAME is set to
-   the object name which experienced the problems.  ERRSTRING if nonzero
-   points to a malloc'ed string which the caller has to free after use.
-   ARGS is passed as argument to OPERATE.  MALLOCEDP is set to true only
-   if the returned string is allocated using the libc's malloc.  */
-extern int _dl_catch_error (const char **objname, const char **errstring,
-                           bool *mallocedp, void (*operate) (void *),
-                           void *args)
-     internal_function;
+                      void *who);
 
 /* Helper function for <dlfcn.h> functions.  Runs the OPERATE function via
    _dl_catch_error.  Returns zero for success, nonzero for failure; and
    arranges for `dlerror' to return the error details.
    ARGS is passed as argument to OPERATE.  */
 extern int _dlerror_run (void (*operate) (void *), void *args)
-     internal_function;
+    attribute_hidden;
 
 #ifdef SHARED
 # define DL_CALLER_DECL /* Nothing */
@@ -140,4 +156,7 @@ extern void __libc_register_dlfcn_hook (struct link_map *map)
      attribute_hidden;
 #endif
 
+extern void __dlerror_main_freeres (void) attribute_hidden;
+
+#endif
 #endif