diff options
Diffstat (limited to 'REORG.TODO/elf/dl-caller.c')
| -rw-r--r-- | REORG.TODO/elf/dl-caller.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/REORG.TODO/elf/dl-caller.c b/REORG.TODO/elf/dl-caller.c new file mode 100644 index 0000000000..b4c5335baa --- /dev/null +++ b/REORG.TODO/elf/dl-caller.c @@ -0,0 +1,86 @@ +/* Check whether caller comes from the right place. + Copyright (C) 2004-2017 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, see + <http://www.gnu.org/licenses/>. */ + +#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 (Lmid_t ns = 0; ns < GL(dl_nns); ++ns) + for (struct link_map *l = GL(dl_ns)[ns]._ns_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; +} |