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87 lines
2.6 KiB
C
87 lines
2.6 KiB
C
/* Check whether caller comes from the right place.
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Copyright (C) 2004-2017 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, see
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<http://www.gnu.org/licenses/>. */
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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 (Lmid_t ns = 0; ns < GL(dl_nns); ++ns)
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for (struct link_map *l = GL(dl_ns)[ns]._ns_loaded; l != NULL;
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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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