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authorUlrich Drepper <drepper@redhat.com>2004-03-27 03:40:33 +0000
committerUlrich Drepper <drepper@redhat.com>2004-03-27 03:40:33 +0000
commiteec8b6cae586451deadf30c371f7b5e4c9d573d1 (patch)
treeb005437b5b7d69778e06694e4bd836a3e7c42f6a /elf/dl-open.c
parent17c263876bf38178d3a4ba720bf81d7a214bba51 (diff)
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Update.
2004-03-26 Ulrich Drepper <drepper@redhat.com> * elf/dl-caller.c: New file. * include/caller.h: New file. * Makefile (distribute): Add include/caller.h. * elf/Makefile (dl-routines): Add dl-caller. * elf/dl-load.c (_dl_map_object_from_fd): Record l_text_end. * elf/dl-open.c (check_libc_caller): Removed. (dl_open_worker): Use __check_caller instead. * elf/rtld.c (_rtld_global_ro): Initialize _dl_check_caller. (_dl_start_final): Record l_text_end for ld.so map. (dl_main): Record l_text_end for main object and vdso. * include/link.h (struct link_map): Add l_text_end field. * sysdeps/generic/ldsodefs.h (struct rtld_global_ro): Add _dl_check_caller field. Define enum allowmask. Add declaration of _dl_check_caller. * sysdeps/unix/sysv/linux/dl-execstack.c: Also use __check_caller test.
Diffstat (limited to 'elf/dl-open.c')
-rw-r--r--elf/dl-open.c68
1 files changed, 2 insertions, 66 deletions
diff --git a/elf/dl-open.c b/elf/dl-open.c
index 47db84c..70f2fb2 100644
--- a/elf/dl-open.c
+++ b/elf/dl-open.c
@@ -30,7 +30,7 @@
#include <bits/libc-lock.h>
#include <ldsodefs.h>
#include <bp-sym.h>
-#include <gnu/lib-names.h>
+#include <caller.h>
#include <dl-dst.h>
@@ -156,68 +156,6 @@ add_to_global (struct link_map *new)
}
-#ifdef SHARED
-static int
-internal_function
-check_libc_caller (const void *caller)
-{
- static const char expected1[] = LIBC_SO;
- static const char expected2[] = LIBDL_SO;
-
- /* If we already know the address ranges, just test. */
- static const void *expected1_from;
- static const void *expected1_to;
- static const void *expected2_from;
- static const void *expected2_to;
-
- if (expected1_from == NULL)
- {
- /* The only other DSO which is allowed to call these functions is
- libdl. Find the address range containing the caller. */
- struct link_map *l;
-
- for (l = GL(dl_loaded); l != NULL; l = l->l_next)
- if (strcmp (expected1, l->l_name) == 0)
- {
- is_1:
- expected1_from = (const void *) l->l_map_start;
- expected1_to = (const void *) l->l_map_end;
- }
- else if (strcmp (expected2, l->l_name) == 0)
- {
- is_2:
- expected2_from = (const void *) l->l_map_start;
- expected2_to = (const void *) l->l_map_end;
- }
- else
- {
- struct libname_list *runp = l->l_libname;
-
- while (runp != NULL)
- {
- if (strcmp (expected1, runp->name) == 0)
- goto is_1;
- else if (strcmp (expected2, runp->name) == 0)
- goto is_2;
-
- runp = runp->next;
- }
- }
-
- assert (expected1_from != NULL);
- }
-
- /* When there would be more than two expected caller we could use an
- array for the values but for now this is cheaper. */
- if ((caller >= expected1_from && caller < expected1_to)
- || (caller >= expected2_from && caller < expected2_to))
- return 0;
-
- return 1;
-}
-#endif
-
-
static void
dl_open_worker (void *a)
{
@@ -232,11 +170,9 @@ dl_open_worker (void *a)
bool any_tls;
#endif
-#ifdef SHARED
/* Check whether _dl_open() has been called from a valid DSO. */
- if (check_libc_caller (args->caller_dl_open) != 0)
+ if (__check_caller (args->caller_dl_open, allow_libc|allow_libdl) != 0)
GLRO(dl_signal_error) (0, "dlopen", NULL, N_("invalid caller"));
-#endif
/* Maybe we have to expand a DST. */
dst = strchr (file, '$');