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-rw-r--r--elf/dl-reloc-static-pie.c68
1 files changed, 68 insertions, 0 deletions
diff --git a/elf/dl-reloc-static-pie.c b/elf/dl-reloc-static-pie.c
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+/* Support for relocating static PIE.
+ Copyright (C) 2017-2018 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/>. */
+
+#if ENABLE_STATIC_PIE
+#include <unistd.h>
+#include <ldsodefs.h>
+#include "dynamic-link.h"
+
+/* Relocate static executable with PIE. */
+
+void
+_dl_relocate_static_pie (void)
+{
+ struct link_map *main_map = _dl_get_dl_main_map ();
+
+# define STATIC_PIE_BOOTSTRAP
+# define BOOTSTRAP_MAP (main_map)
+# define RESOLVE_MAP(sym, version, flags) BOOTSTRAP_MAP
+# include "dynamic-link.h"
+
+ /* Figure out the run-time load address of static PIE. */
+ main_map->l_addr = elf_machine_load_address ();
+
+ /* Read our own dynamic section and fill in the info array. */
+ main_map->l_ld = ((void *) main_map->l_addr + elf_machine_dynamic ());
+ elf_get_dynamic_info (main_map, NULL);
+
+# ifdef ELF_MACHINE_BEFORE_RTLD_RELOC
+ ELF_MACHINE_BEFORE_RTLD_RELOC (main_map->l_info);
+# endif
+
+ /* Relocate ourselves so we can do normal function calls and
+ data access using the global offset table. */
+ ELF_DYNAMIC_RELOCATE (main_map, 0, 0, 0);
+ main_map->l_relocated = 1;
+
+ /* Initialize _r_debug. */
+ struct r_debug *r = _dl_debug_initialize (0, LM_ID_BASE);
+ r->r_state = RT_CONSISTENT;
+
+ /* Set up debugging before the debugger is notified for the first
+ time. */
+# ifdef ELF_MACHINE_DEBUG_SETUP
+ /* Some machines (e.g. MIPS) don't use DT_DEBUG in this way. */
+ ELF_MACHINE_DEBUG_SETUP (main_map, r);
+# else
+ if (main_map->l_info[DT_DEBUG] != NULL)
+ /* There is a DT_DEBUG entry in the dynamic section. Fill it in
+ with the run-time address of the r_debug structure */
+ main_map->l_info[DT_DEBUG]->d_un.d_ptr = (ElfW(Addr)) r;
+# endif
+}
+#endif