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056fc1c0e3
The audit symbind callback is not called for binaries built with
-Wl,-z,now or when LD_BIND_NOW=1 is used, nor the PLT tracking callbacks
(plt_enter and plt_exit) since this would change the expected
program semantics (where no PLT is expected) and would have performance
implications (such as for BZ#15533).
LAV_CURRENT is also bumped to indicate the audit ABI change (where
la_symbind flags are set by the loader to indicate no possible PLT
trace).
To handle powerpc64 ELFv1 function descriptor, _dl_audit_symbind
requires to know whether bind-now is used so the symbol value is
updated to function text segment instead of the OPD (for lazy binding
this is done by PPC64_LOAD_FUNCPTR on _dl_runtime_resolve).
Checked on x86_64-linux-gnu, i686-linux-gnu, aarch64-linux-gnu,
powerpc64-linux-gnu.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
Tested-by: Carlos O'Donell <carlos@redhat.com>
(cherry picked from commit 32612615c5)
Resolved conflicts:
NEWS - Manual merge.
80 lines
2.7 KiB
C
80 lines
2.7 KiB
C
/* Configuration of lookup functions.
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Copyright (C) 2000-2021 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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<https://www.gnu.org/licenses/>. */
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#define ELF_FUNCTION_PTR_IS_SPECIAL
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#define DL_UNMAP_IS_SPECIAL
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#include <dl-fptr.h>
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/* We do not support copy relocations for IA-64. */
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#define DL_NO_COPY_RELOCS
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/* Forward declaration. */
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struct link_map;
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extern void *_dl_symbol_address (struct link_map *map, const Elf64_Sym *ref);
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rtld_hidden_proto (_dl_symbol_address)
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#define DL_SYMBOL_ADDRESS(map, ref) _dl_symbol_address(map, ref)
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extern Elf64_Addr _dl_lookup_address (const void *address);
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#define DL_LOOKUP_ADDRESS(addr) _dl_lookup_address (addr)
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extern void attribute_hidden _dl_unmap (struct link_map *map);
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#define DL_UNMAP(map) _dl_unmap (map)
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#define DL_DT_FUNCTION_ADDRESS(map, start, attr, addr) \
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attr volatile unsigned long int fptr[2]; \
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fptr[0] = (unsigned long int) (start); \
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fptr[1] = (map)->l_info[DT_PLTGOT]->d_un.d_ptr; \
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addr = (ElfW(Addr)) fptr; \
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#define DL_CALL_DT_INIT(map, start, argc, argv, env) \
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{ \
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ElfW(Addr) addr; \
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DL_DT_FUNCTION_ADDRESS(map, start, , addr) \
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dl_init_t init = (dl_init_t) addr; \
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init (argc, argv, env); \
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}
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#define DL_CALL_DT_FINI(map, start) \
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{ \
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ElfW(Addr) addr; \
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DL_DT_FUNCTION_ADDRESS(map, start, , addr) \
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fini_t fini = (fini_t) addr; \
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fini (); \
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}
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/* The type of the return value of fixup/profile_fixup. */
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#define DL_FIXUP_VALUE_TYPE struct fdesc
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/* Construct a value of type DL_FIXUP_VALUE_TYPE from a code address
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and a link map. */
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#define DL_FIXUP_MAKE_VALUE(map, addr) \
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((struct fdesc) { (addr), (map)->l_info[DT_PLTGOT]->d_un.d_ptr })
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/* Extract the code address from a value of type DL_FIXUP_MAKE_VALUE.
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*/
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#define DL_FIXUP_VALUE_CODE_ADDR(value) (value).ip
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#define DL_FIXUP_VALUE_ADDR(value) ((uintptr_t) &(value))
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#define DL_FIXUP_ADDR_VALUE(addr) (*(struct fdesc *) (addr))
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#define DL_FIXUP_BINDNOW_ADDR_VALUE(addr) (addr)
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#define DL_FIXUP_BINDNOW_RELOC(value, new_value, st_value) \
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(*value) = *(struct fdesc *) (st_value)
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