diff options
Diffstat (limited to 'elf/dl-open.c')
-rw-r--r-- | elf/dl-open.c | 136 |
1 files changed, 18 insertions, 118 deletions
diff --git a/elf/dl-open.c b/elf/dl-open.c index 6f178b333d..f6c8ef1043 100644 --- a/elf/dl-open.c +++ b/elf/dl-open.c @@ -1,5 +1,5 @@ /* Load a shared object at runtime, relocate it, and run its initializer. - Copyright (C) 1996-2016 Free Software Foundation, Inc. + Copyright (C) 1996-2018 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 @@ -28,17 +28,16 @@ #include <sys/param.h> #include <libc-lock.h> #include <ldsodefs.h> -#include <caller.h> #include <sysdep-cancel.h> #include <tls.h> #include <stap-probe.h> #include <atomic.h> +#include <libc-internal.h> #include <dl-dst.h> +#include <dl-prop.h> -extern int __libc_multiple_libcs; /* Defined in init-first.c. */ - /* We must be careful not to leave us in an inconsistent state. Thus we catch any error and re-raise it after cleaning up. */ @@ -48,8 +47,6 @@ struct dl_open_args int mode; /* This is the caller of the dlopen() function. */ const void *caller_dlopen; - /* This is the caller of _dl_open(). */ - const void *caller_dl_open; struct link_map *map; /* Namespace ID. */ Lmid_t nsid; @@ -162,7 +159,6 @@ add_to_global (struct link_map *new) address ADDR. Returns the pointer to the link map of the matching DSO, or NULL if a match is not found. */ struct link_map * -internal_function _dl_find_dso_for_object (const ElfW(Addr) addr) { struct link_map *l; @@ -189,11 +185,6 @@ dl_open_worker (void *a) int mode = args->mode; struct link_map *call_map = NULL; - /* Check whether _dl_open() has been called from a valid DSO. */ - if (__check_caller (args->caller_dl_open, - allow_libc|allow_libdl|allow_ldso) != 0) - _dl_signal_error (0, "dlopen", NULL, N_("invalid caller")); - /* Determine the caller's map if necessary. This is needed in case we have a DST, when we don't know the namespace ID we have to put the new object in, or when the file name has no path in which @@ -226,12 +217,6 @@ dl_open_worker (void *a) args->map = new = _dl_map_object (call_map, file, lt_loaded, 0, mode | __RTLD_CALLMAP, args->nsid); - /* Mark the object as not deletable if the RTLD_NODELETE flags was passed. - Do this early so that we don't skip marking the object if it was - already loaded. */ - if (__glibc_unlikely (mode & RTLD_NODELETE)) - new->l_flags_1 |= DF_1_NODELETE; - /* If the pointer returned is NULL this means the RTLD_NOLOAD flag is set and the object is not already loaded. */ if (new == NULL) @@ -240,6 +225,12 @@ dl_open_worker (void *a) return; } + /* Mark the object as not deletable if the RTLD_NODELETE flags was passed. + Do this early so that we don't skip marking the object if it was + already loaded. */ + if (__glibc_unlikely (mode & RTLD_NODELETE)) + new->l_flags_1 |= DF_1_NODELETE; + if (__glibc_unlikely (mode & __RTLD_SPROF)) /* This happens only if we load a DSO for 'sprof'. */ return; @@ -301,6 +292,8 @@ dl_open_worker (void *a) _dl_debug_state (); LIBC_PROBE (map_complete, 3, args->nsid, r, new); + _dl_open_check (new); + /* Print scope information. */ if (__glibc_unlikely (GLRO(dl_debug_mask) & DL_DEBUG_SCOPES)) _dl_show_scope (new, 0); @@ -313,7 +306,7 @@ dl_open_worker (void *a) /* Sort the objects by dependency for the relocation process. This allows IFUNC relocations to work and it also means copy relocation of dependencies are if necessary overwritten. */ - size_t nmaps = 0; + unsigned int nmaps = 0; struct link_map *l = new; do { @@ -332,62 +325,11 @@ dl_open_worker (void *a) l = l->l_next; } while (l != NULL); - if (nmaps > 1) - { - uint16_t seen[nmaps]; - memset (seen, '\0', sizeof (seen)); - size_t i = 0; - while (1) - { - ++seen[i]; - struct link_map *thisp = maps[i]; - - /* Find the last object in the list for which the current one is - a dependency and move the current object behind the object - with the dependency. */ - size_t k = nmaps - 1; - while (k > i) - { - struct link_map **runp = maps[k]->l_initfini; - if (runp != NULL) - /* Look through the dependencies of the object. */ - while (*runp != NULL) - if (__glibc_unlikely (*runp++ == thisp)) - { - /* Move the current object to the back past the last - object with it as the dependency. */ - memmove (&maps[i], &maps[i + 1], - (k - i) * sizeof (maps[0])); - maps[k] = thisp; - - if (seen[i + 1] > nmaps - i) - { - ++i; - goto next_clear; - } - - uint16_t this_seen = seen[i]; - memmove (&seen[i], &seen[i + 1], - (k - i) * sizeof (seen[0])); - seen[k] = this_seen; - - goto next; - } - - --k; - } - - if (++i == nmaps) - break; - next_clear: - memset (&seen[i], 0, (nmaps - i) * sizeof (seen[0])); - next:; - } - } + _dl_sort_maps (maps, nmaps, NULL, false); int relocation_in_progress = 0; - for (size_t i = nmaps; i-- > 0; ) + for (unsigned int i = nmaps; i-- > 0; ) { l = maps[i]; @@ -636,18 +578,14 @@ no more namespaces available for dlmopen()")); args.file = file; args.mode = mode; args.caller_dlopen = caller_dlopen; - args.caller_dl_open = RETURN_ADDRESS (0); args.map = NULL; args.nsid = nsid; args.argc = argc; args.argv = argv; args.env = env; - const char *objname; - const char *errstring; - bool malloced; - int errcode = _dl_catch_error (&objname, &errstring, &malloced, - dl_open_worker, &args); + struct dl_exception exception; + int errcode = _dl_catch_exception (&exception, dl_open_worker, &args); #if defined USE_LDCONFIG && !defined MAP_COPY /* We must unmap the cache file. */ @@ -655,7 +593,7 @@ no more namespaces available for dlmopen()")); #endif /* See if an error occurred during loading. */ - if (__glibc_unlikely (errstring != NULL)) + if (__glibc_unlikely (exception.errstring != NULL)) { /* Remove the object from memory. It may be in an inconsistent state if relocation failed, for example. */ @@ -679,28 +617,8 @@ no more namespaces available for dlmopen()")); /* Release the lock. */ __rtld_lock_unlock_recursive (GL(dl_load_lock)); - /* Make a local copy of the error string so that we can release the - memory allocated for it. */ - size_t len_errstring = strlen (errstring) + 1; - char *local_errstring; - if (objname == errstring + len_errstring) - { - size_t total_len = len_errstring + strlen (objname) + 1; - local_errstring = alloca (total_len); - memcpy (local_errstring, errstring, total_len); - objname = local_errstring + len_errstring; - } - else - { - local_errstring = alloca (len_errstring); - memcpy (local_errstring, errstring, len_errstring); - } - - if (malloced) - free ((char *) errstring); - /* Reraise the error. */ - _dl_signal_error (errcode, objname, NULL, local_errstring); + _dl_signal_exception (errcode, &exception, NULL); } assert (_dl_debug_initialize (0, args.nsid)->r_state == RT_CONSISTENT); @@ -735,21 +653,3 @@ _dl_show_scope (struct link_map *l, int from) _dl_debug_printf (" no scope\n"); _dl_debug_printf ("\n"); } - -#if IS_IN (rtld) -/* Return non-zero if ADDR lies within one of L's segments. */ -int -internal_function -_dl_addr_inside_object (struct link_map *l, const ElfW(Addr) addr) -{ - int n = l->l_phnum; - const ElfW(Addr) reladdr = addr - l->l_addr; - - while (--n >= 0) - if (l->l_phdr[n].p_type == PT_LOAD - && reladdr - l->l_phdr[n].p_vaddr >= 0 - && reladdr - l->l_phdr[n].p_vaddr < l->l_phdr[n].p_memsz) - return 1; - return 0; -} -#endif |