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authorUlrich Drepper <drepper@redhat.com>2000-10-23 21:40:57 +0000
committerUlrich Drepper <drepper@redhat.com>2000-10-23 21:40:57 +0000
commitf92338be6ead8e01060343e9a678ddccf2b5a139 (patch)
tree3631e9877cae37164e0347a69ac4a24a036ac5a9 /elf/dl-sym.c
parent0d0db00c0238627fdfa46f9990e3489257f252d4 (diff)
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Update.
* elf/dl-sym.c (_dl_sym): Use exact check for caller PC in range of DSO address space. (_dl_vsym): Likewise.
Diffstat (limited to 'elf/dl-sym.c')
-rw-r--r--elf/dl-sym.c60
1 files changed, 33 insertions, 27 deletions
diff --git a/elf/dl-sym.c b/elf/dl-sym.c
index 954741b..ffc36bc 100644
--- a/elf/dl-sym.c
+++ b/elf/dl-sym.c
@@ -35,20 +35,23 @@ _dl_sym (void *handle, const char *name, void *who)
struct link_map *match;
struct link_map *l;
+ /* If the address is not recognized the call comes from the main
+ program (we hope). */
+ match = _dl_loaded;
+
/* Find the highest-addressed object that CALLER is not below. */
- match = NULL;
- for (l = _dl_loaded; l; l = l->l_next)
- if (caller >= l->l_addr && (!match || match->l_addr < l->l_addr))
- match = l;
+ for (l = _dl_loaded; l != NULL; l = l->l_next)
+ if (l->l_addr != 0 && caller >= l->l_map_start && caller < l->l_map_end)
+ {
+ /* There must be exactly one DSO for the range of the virtual
+ memory. Otherwise something is really broken. */
+ match = l;
+ break;
+ }
if (handle == RTLD_DEFAULT)
- {
- /* Search the global scope as seen in the caller object. */
- if (match != NULL)
- result = _dl_lookup_symbol (name, match, &ref, match->l_scope, 0, 0);
- else
- result = _dl_lookup_symbol (name, match, &ref, _dl_global_scope, 0, 0);
- }
+ /* Search the global scope as seen in the caller object. */
+ result = _dl_lookup_symbol (name, match, &ref, match->l_scope, 0, 0);
else
{
if (handle != RTLD_NEXT)
@@ -56,22 +59,17 @@ _dl_sym (void *handle, const char *name, void *who)
/* Search the scope of the given object. */
struct link_map *map = handle;
- if (match == NULL)
- /* If the address is not recognized the call comes from the
- main program (we hope). */
- match = _dl_loaded;
-
result = _dl_lookup_symbol (name, match, &ref, map->l_local_scope,
0, 1);
}
else
{
- if (! match)
+ if (__builtin_expect (match == _dl_loaded, 0))
_dl_signal_error (0, NULL, N_("\
RTLD_NEXT used in code not dynamically loaded"));
l = match;
- while (l->l_loader)
+ while (l->l_loader != NULL)
l = l->l_loader;
result = _dl_lookup_symbol_skip (name, l, &ref, l->l_local_scope,
@@ -79,7 +77,7 @@ RTLD_NEXT used in code not dynamically loaded"));
}
}
- if (ref)
+ if (ref != NULL)
return DL_SYMBOL_ADDRESS (result, ref);
return NULL;
@@ -103,24 +101,32 @@ _dl_vsym (void *handle, const char *name, const char *version, void *who)
/* We don't have a specific file where the symbol can be found. */
vers.filename = NULL;
+ /* If the address is not recognized the call comes from the main
+ program (we hope). */
+ match = _dl_loaded;
+
/* Find the highest-addressed object that CALLER is not below. */
- match = NULL;
- for (l = _dl_loaded; l; l = l->l_next)
- if (caller >= l->l_addr && (!match || match->l_addr < l->l_addr))
- match = l;
+ for (l = _dl_loaded; l != NULL; l = l->l_next)
+ if (l->l_addr != 0 && caller >= l->l_map_start && caller < l->l_map_end)
+ {
+ /* There must be exactly one DSO for the range of the virtual
+ memory. Otherwise something is really broken. */
+ match = l;
+ break;
+ }
if (handle == RTLD_DEFAULT)
/* Search the global scope. */
- result = _dl_lookup_versioned_symbol (name, match, &ref, _dl_global_scope,
+ result = _dl_lookup_versioned_symbol (name, match, &ref, match->l_scope,
&vers, 0, 0);
else if (handle == RTLD_NEXT)
{
- if (! match)
+ if (match == _dl_loaded)
_dl_signal_error (0, NULL, N_("\
RTLD_NEXT used in code not dynamically loaded"));
l = match;
- while (l->l_loader)
+ while (l->l_loader != NULL)
l = l->l_loader;
result = _dl_lookup_versioned_symbol_skip (name, l, &ref,
@@ -135,7 +141,7 @@ RTLD_NEXT used in code not dynamically loaded"));
map->l_local_scope, &vers, 0, 1);
}
- if (ref)
+ if (ref != NULL)
return DL_SYMBOL_ADDRESS (result, ref);
return NULL;