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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-caller.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-caller.c')
-rw-r--r--elf/dl-caller.c85
1 files changed, 85 insertions, 0 deletions
diff --git a/elf/dl-caller.c b/elf/dl-caller.c
new file mode 100644
index 0000000000..ddabbd0f2d
--- /dev/null
+++ b/elf/dl-caller.c
@@ -0,0 +1,85 @@
+/* Check whether caller comes from the right place.
+ Copyright (C) 2004 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
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#include <assert.h>
+#include <ldsodefs.h>
+#include <stddef.h>
+#include <caller.h>
+#include <gnu/lib-names.h>
+
+
+int
+attribute_hidden
+_dl_check_caller (const void *caller, enum allowmask mask)
+{
+ static const char expected1[] = LIBC_SO;
+ static const char expected2[] = LIBDL_SO;
+#ifdef LIBPTHREAD_SO
+ static const char expected3[] = LIBPTHREAD_SO;
+#endif
+ static const char expected4[] = LD_SO;
+
+ for (struct link_map *l = GL(dl_loaded); l != NULL; l = l->l_next)
+ if (caller >= (const void *) l->l_map_start
+ && caller < (const void *) l->l_text_end)
+ {
+ /* The address falls into this DSO's address range. Check the
+ name. */
+ if ((mask & allow_libc) && strcmp (expected1, l->l_name) == 0)
+ return 0;
+ if ((mask & allow_libdl) && strcmp (expected2, l->l_name) == 0)
+ return 0;
+#ifdef LIBPTHREAD_SO
+ if ((mask & allow_libpthread) && strcmp (expected3, l->l_name) == 0)
+ return 0;
+#endif
+ if ((mask & allow_ldso) && strcmp (expected4, l->l_name) == 0)
+ return 0;
+
+ struct libname_list *runp = l->l_libname;
+
+ while (runp != NULL)
+ {
+ if ((mask & allow_libc) && strcmp (expected1, runp->name) == 0)
+ return 0;
+ if ((mask & allow_libdl) && strcmp (expected2, runp->name) == 0)
+ return 0;
+#ifdef LIBPTHREAD_SO
+ if ((mask & allow_libpthread)
+ && strcmp (expected3, runp->name) == 0)
+ return 0;
+#endif
+ if ((mask & allow_ldso) && strcmp (expected4, runp->name) == 0)
+ return 0;
+
+ runp = runp->next;
+ }
+
+ break;
+ }
+
+ /* Maybe the dynamic linker is not yet on the list. */
+ if ((mask & allow_ldso) != 0
+ && caller >= (const void *) GL(dl_rtld_map).l_map_start
+ && caller < (const void *) GL(dl_rtld_map).l_text_end)
+ return 0;
+
+ /* No valid caller. */
+ return 1;
+}