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eec8b6cae5
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.
86 lines
2.6 KiB
C
86 lines
2.6 KiB
C
/* Check whether caller comes from the right place.
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Copyright (C) 2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <assert.h>
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#include <ldsodefs.h>
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#include <stddef.h>
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#include <caller.h>
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#include <gnu/lib-names.h>
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int
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attribute_hidden
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_dl_check_caller (const void *caller, enum allowmask mask)
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{
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static const char expected1[] = LIBC_SO;
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static const char expected2[] = LIBDL_SO;
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#ifdef LIBPTHREAD_SO
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static const char expected3[] = LIBPTHREAD_SO;
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#endif
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static const char expected4[] = LD_SO;
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for (struct link_map *l = GL(dl_loaded); l != NULL; l = l->l_next)
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if (caller >= (const void *) l->l_map_start
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&& caller < (const void *) l->l_text_end)
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{
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/* The address falls into this DSO's address range. Check the
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name. */
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if ((mask & allow_libc) && strcmp (expected1, l->l_name) == 0)
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return 0;
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if ((mask & allow_libdl) && strcmp (expected2, l->l_name) == 0)
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return 0;
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#ifdef LIBPTHREAD_SO
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if ((mask & allow_libpthread) && strcmp (expected3, l->l_name) == 0)
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return 0;
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#endif
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if ((mask & allow_ldso) && strcmp (expected4, l->l_name) == 0)
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return 0;
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struct libname_list *runp = l->l_libname;
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while (runp != NULL)
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{
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if ((mask & allow_libc) && strcmp (expected1, runp->name) == 0)
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return 0;
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if ((mask & allow_libdl) && strcmp (expected2, runp->name) == 0)
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return 0;
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#ifdef LIBPTHREAD_SO
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if ((mask & allow_libpthread)
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&& strcmp (expected3, runp->name) == 0)
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return 0;
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#endif
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if ((mask & allow_ldso) && strcmp (expected4, runp->name) == 0)
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return 0;
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runp = runp->next;
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}
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break;
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}
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/* Maybe the dynamic linker is not yet on the list. */
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if ((mask & allow_ldso) != 0
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&& caller >= (const void *) GL(dl_rtld_map).l_map_start
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&& caller < (const void *) GL(dl_rtld_map).l_text_end)
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return 0;
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/* No valid caller. */
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return 1;
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}
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