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e1d559f337
To improve GCC 10 compatibility, it is necessary to remove the l_audit zero-length array from the end of struct link_map. In preparation of that, this commit introduces an accessor function for the audit state, so that it is possible to change the representation of the audit state without adjusting the code that accesses it. Tested on x86_64-linux-gnu. Built on i686-gnu. Change-Id: Id815673c29950fc011ae5301d7cde12624f658df
525 lines
17 KiB
C
525 lines
17 KiB
C
/* On-demand PLT fixup for shared objects.
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Copyright (C) 1995-2019 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 IN_DL_RUNTIME 1 /* This can be tested in dl-machine.h. */
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#include <alloca.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/param.h>
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#include <ldsodefs.h>
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#include <sysdep-cancel.h>
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#include "dynamic-link.h"
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#include <tls.h>
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#include <dl-irel.h>
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#if (!ELF_MACHINE_NO_RELA && !defined ELF_MACHINE_PLT_REL) \
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|| ELF_MACHINE_NO_REL
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# define PLTREL ElfW(Rela)
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#else
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# define PLTREL ElfW(Rel)
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#endif
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/* The fixup functions might have need special attributes. If none
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are provided define the macro as empty. */
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#ifndef ARCH_FIXUP_ATTRIBUTE
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# define ARCH_FIXUP_ATTRIBUTE
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#endif
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#ifndef reloc_offset
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# define reloc_offset reloc_arg
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# define reloc_index reloc_arg / sizeof (PLTREL)
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#endif
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/* This function is called through a special trampoline from the PLT the
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first time each PLT entry is called. We must perform the relocation
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specified in the PLT of the given shared object, and return the resolved
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function address to the trampoline, which will restart the original call
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to that address. Future calls will bounce directly from the PLT to the
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function. */
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DL_FIXUP_VALUE_TYPE
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attribute_hidden __attribute ((noinline)) ARCH_FIXUP_ATTRIBUTE
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_dl_fixup (
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# ifdef ELF_MACHINE_RUNTIME_FIXUP_ARGS
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ELF_MACHINE_RUNTIME_FIXUP_ARGS,
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# endif
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struct link_map *l, ElfW(Word) reloc_arg)
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{
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const ElfW(Sym) *const symtab
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= (const void *) D_PTR (l, l_info[DT_SYMTAB]);
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const char *strtab = (const void *) D_PTR (l, l_info[DT_STRTAB]);
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const PLTREL *const reloc
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= (const void *) (D_PTR (l, l_info[DT_JMPREL]) + reloc_offset);
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const ElfW(Sym) *sym = &symtab[ELFW(R_SYM) (reloc->r_info)];
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const ElfW(Sym) *refsym = sym;
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void *const rel_addr = (void *)(l->l_addr + reloc->r_offset);
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lookup_t result;
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DL_FIXUP_VALUE_TYPE value;
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/* Sanity check that we're really looking at a PLT relocation. */
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assert (ELFW(R_TYPE)(reloc->r_info) == ELF_MACHINE_JMP_SLOT);
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/* Look up the target symbol. If the normal lookup rules are not
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used don't look in the global scope. */
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if (__builtin_expect (ELFW(ST_VISIBILITY) (sym->st_other), 0) == 0)
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{
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const struct r_found_version *version = NULL;
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if (l->l_info[VERSYMIDX (DT_VERSYM)] != NULL)
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{
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const ElfW(Half) *vernum =
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(const void *) D_PTR (l, l_info[VERSYMIDX (DT_VERSYM)]);
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ElfW(Half) ndx = vernum[ELFW(R_SYM) (reloc->r_info)] & 0x7fff;
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version = &l->l_versions[ndx];
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if (version->hash == 0)
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version = NULL;
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}
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/* We need to keep the scope around so do some locking. This is
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not necessary for objects which cannot be unloaded or when
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we are not using any threads (yet). */
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int flags = DL_LOOKUP_ADD_DEPENDENCY;
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if (!RTLD_SINGLE_THREAD_P)
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{
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THREAD_GSCOPE_SET_FLAG ();
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flags |= DL_LOOKUP_GSCOPE_LOCK;
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}
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#ifdef RTLD_ENABLE_FOREIGN_CALL
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RTLD_ENABLE_FOREIGN_CALL;
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#endif
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result = _dl_lookup_symbol_x (strtab + sym->st_name, l, &sym, l->l_scope,
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version, ELF_RTYPE_CLASS_PLT, flags, NULL);
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/* We are done with the global scope. */
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if (!RTLD_SINGLE_THREAD_P)
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THREAD_GSCOPE_RESET_FLAG ();
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#ifdef RTLD_FINALIZE_FOREIGN_CALL
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RTLD_FINALIZE_FOREIGN_CALL;
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#endif
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/* Currently result contains the base load address (or link map)
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of the object that defines sym. Now add in the symbol
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offset. */
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value = DL_FIXUP_MAKE_VALUE (result,
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SYMBOL_ADDRESS (result, sym, false));
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}
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else
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{
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/* We already found the symbol. The module (and therefore its load
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address) is also known. */
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value = DL_FIXUP_MAKE_VALUE (l, SYMBOL_ADDRESS (l, sym, true));
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result = l;
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}
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/* And now perhaps the relocation addend. */
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value = elf_machine_plt_value (l, reloc, value);
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if (sym != NULL
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&& __builtin_expect (ELFW(ST_TYPE) (sym->st_info) == STT_GNU_IFUNC, 0))
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value = elf_ifunc_invoke (DL_FIXUP_VALUE_ADDR (value));
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/* Finally, fix up the plt itself. */
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if (__glibc_unlikely (GLRO(dl_bind_not)))
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return value;
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return elf_machine_fixup_plt (l, result, refsym, sym, reloc, rel_addr, value);
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}
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#ifndef PROF
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DL_FIXUP_VALUE_TYPE
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__attribute ((noinline)) ARCH_FIXUP_ATTRIBUTE
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_dl_profile_fixup (
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#ifdef ELF_MACHINE_RUNTIME_FIXUP_ARGS
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ELF_MACHINE_RUNTIME_FIXUP_ARGS,
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#endif
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struct link_map *l, ElfW(Word) reloc_arg,
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ElfW(Addr) retaddr, void *regs, long int *framesizep)
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{
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void (*mcount_fct) (ElfW(Addr), ElfW(Addr)) = _dl_mcount;
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if (l->l_reloc_result == NULL)
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{
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/* BZ #14843: ELF_DYNAMIC_RELOCATE is called before l_reloc_result
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is allocated. We will get here if ELF_DYNAMIC_RELOCATE calls a
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resolver function to resolve an IRELATIVE relocation and that
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resolver calls a function that is not yet resolved (lazy). For
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example, the resolver in x86-64 libm.so calls __get_cpu_features
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defined in libc.so. Skip audit and resolve the external function
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in this case. */
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*framesizep = -1;
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return _dl_fixup (
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# ifdef ELF_MACHINE_RUNTIME_FIXUP_ARGS
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# ifndef ELF_MACHINE_RUNTIME_FIXUP_PARAMS
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# error Please define ELF_MACHINE_RUNTIME_FIXUP_PARAMS.
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# endif
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ELF_MACHINE_RUNTIME_FIXUP_PARAMS,
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# endif
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l, reloc_arg);
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}
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/* This is the address in the array where we store the result of previous
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relocations. */
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struct reloc_result *reloc_result = &l->l_reloc_result[reloc_index];
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/* CONCURRENCY NOTES:
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Multiple threads may be calling the same PLT sequence and with
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LD_AUDIT enabled they will be calling into _dl_profile_fixup to
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update the reloc_result with the result of the lazy resolution.
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The reloc_result guard variable is reloc_init, and we use
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acquire/release loads and store to it to ensure that the results of
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the structure are consistent with the loaded value of the guard.
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This does not fix all of the data races that occur when two or more
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threads read reloc_result->reloc_init with a value of zero and read
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and write to that reloc_result concurrently. The expectation is
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generally that while this is a data race it works because the
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threads write the same values. Until the data races are fixed
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there is a potential for problems to arise from these data races.
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The reloc result updates should happen in parallel but there should
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be an atomic RMW which does the final update to the real result
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entry (see bug 23790).
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The following code uses reloc_result->init set to 0 to indicate if it is
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the first time this object is being relocated, otherwise 1 which
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indicates the object has already been relocated.
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Reading/Writing from/to reloc_result->reloc_init must not happen
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before previous writes to reloc_result complete as they could
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end-up with an incomplete struct. */
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DL_FIXUP_VALUE_TYPE value;
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unsigned int init = atomic_load_acquire (&reloc_result->init);
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if (init == 0)
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{
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/* This is the first time we have to relocate this object. */
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const ElfW(Sym) *const symtab
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= (const void *) D_PTR (l, l_info[DT_SYMTAB]);
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const char *strtab = (const char *) D_PTR (l, l_info[DT_STRTAB]);
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const PLTREL *const reloc
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= (const void *) (D_PTR (l, l_info[DT_JMPREL]) + reloc_offset);
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const ElfW(Sym) *refsym = &symtab[ELFW(R_SYM) (reloc->r_info)];
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const ElfW(Sym) *defsym = refsym;
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lookup_t result;
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/* Sanity check that we're really looking at a PLT relocation. */
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assert (ELFW(R_TYPE)(reloc->r_info) == ELF_MACHINE_JMP_SLOT);
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/* Look up the target symbol. If the symbol is marked STV_PROTECTED
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don't look in the global scope. */
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if (__builtin_expect (ELFW(ST_VISIBILITY) (refsym->st_other), 0) == 0)
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{
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const struct r_found_version *version = NULL;
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if (l->l_info[VERSYMIDX (DT_VERSYM)] != NULL)
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{
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const ElfW(Half) *vernum =
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(const void *) D_PTR (l, l_info[VERSYMIDX (DT_VERSYM)]);
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ElfW(Half) ndx = vernum[ELFW(R_SYM) (reloc->r_info)] & 0x7fff;
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version = &l->l_versions[ndx];
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if (version->hash == 0)
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version = NULL;
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}
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/* We need to keep the scope around so do some locking. This is
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not necessary for objects which cannot be unloaded or when
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we are not using any threads (yet). */
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int flags = DL_LOOKUP_ADD_DEPENDENCY;
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if (!RTLD_SINGLE_THREAD_P)
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{
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THREAD_GSCOPE_SET_FLAG ();
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flags |= DL_LOOKUP_GSCOPE_LOCK;
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}
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result = _dl_lookup_symbol_x (strtab + refsym->st_name, l,
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&defsym, l->l_scope, version,
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ELF_RTYPE_CLASS_PLT, flags, NULL);
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/* We are done with the global scope. */
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if (!RTLD_SINGLE_THREAD_P)
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THREAD_GSCOPE_RESET_FLAG ();
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/* Currently result contains the base load address (or link map)
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of the object that defines sym. Now add in the symbol
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offset. */
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value = DL_FIXUP_MAKE_VALUE (result,
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SYMBOL_ADDRESS (result, defsym, false));
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if (defsym != NULL
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&& __builtin_expect (ELFW(ST_TYPE) (defsym->st_info)
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== STT_GNU_IFUNC, 0))
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value = elf_ifunc_invoke (DL_FIXUP_VALUE_ADDR (value));
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}
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else
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{
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/* We already found the symbol. The module (and therefore its load
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address) is also known. */
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value = DL_FIXUP_MAKE_VALUE (l, SYMBOL_ADDRESS (l, refsym, true));
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if (__builtin_expect (ELFW(ST_TYPE) (refsym->st_info)
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== STT_GNU_IFUNC, 0))
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value = elf_ifunc_invoke (DL_FIXUP_VALUE_ADDR (value));
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result = l;
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}
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/* And now perhaps the relocation addend. */
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value = elf_machine_plt_value (l, reloc, value);
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#ifdef SHARED
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/* Auditing checkpoint: we have a new binding. Provide the
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auditing libraries the possibility to change the value and
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tell us whether further auditing is wanted. */
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if (defsym != NULL && GLRO(dl_naudit) > 0)
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{
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reloc_result->bound = result;
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/* Compute index of the symbol entry in the symbol table of
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the DSO with the definition. */
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reloc_result->boundndx = (defsym
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- (ElfW(Sym) *) D_PTR (result,
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l_info[DT_SYMTAB]));
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/* Determine whether any of the two participating DSOs is
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interested in auditing. */
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if ((l->l_audit_any_plt | result->l_audit_any_plt) != 0)
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{
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unsigned int flags = 0;
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struct audit_ifaces *afct = GLRO(dl_audit);
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/* Synthesize a symbol record where the st_value field is
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the result. */
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ElfW(Sym) sym = *defsym;
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sym.st_value = DL_FIXUP_VALUE_ADDR (value);
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/* Keep track whether there is any interest in tracing
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the call in the lower two bits. */
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assert (DL_NNS * 2 <= sizeof (reloc_result->flags) * 8);
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assert ((LA_SYMB_NOPLTENTER | LA_SYMB_NOPLTEXIT) == 3);
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reloc_result->enterexit = LA_SYMB_NOPLTENTER | LA_SYMB_NOPLTEXIT;
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const char *strtab2 = (const void *) D_PTR (result,
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l_info[DT_STRTAB]);
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for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
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{
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/* XXX Check whether both DSOs must request action or
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only one */
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struct auditstate *l_state = link_map_audit_state (l, cnt);
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struct auditstate *result_state
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= link_map_audit_state (result, cnt);
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if ((l_state->bindflags & LA_FLG_BINDFROM) != 0
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&& (result_state->bindflags & LA_FLG_BINDTO) != 0)
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{
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if (afct->symbind != NULL)
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{
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uintptr_t new_value
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= afct->symbind (&sym, reloc_result->boundndx,
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&l_state->cookie,
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&result_state->cookie,
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&flags,
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strtab2 + defsym->st_name);
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if (new_value != (uintptr_t) sym.st_value)
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{
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flags |= LA_SYMB_ALTVALUE;
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sym.st_value = new_value;
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}
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}
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/* Remember the results for every audit library and
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store a summary in the first two bits. */
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reloc_result->enterexit
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&= flags & (LA_SYMB_NOPLTENTER | LA_SYMB_NOPLTEXIT);
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reloc_result->enterexit
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|= ((flags & (LA_SYMB_NOPLTENTER | LA_SYMB_NOPLTEXIT))
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<< ((cnt + 1) * 2));
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}
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else
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/* If the bind flags say this auditor is not interested,
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set the bits manually. */
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reloc_result->enterexit
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|= ((LA_SYMB_NOPLTENTER | LA_SYMB_NOPLTEXIT)
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<< ((cnt + 1) * 2));
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afct = afct->next;
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}
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reloc_result->flags = flags;
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value = DL_FIXUP_ADDR_VALUE (sym.st_value);
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}
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else
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/* Set all bits since this symbol binding is not interesting. */
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reloc_result->enterexit = (1u << DL_NNS) - 1;
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}
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#endif
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/* Store the result for later runs. */
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if (__glibc_likely (! GLRO(dl_bind_not)))
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{
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reloc_result->addr = value;
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/* Guarantee all previous writes complete before
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init is updated. See CONCURRENCY NOTES earlier */
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atomic_store_release (&reloc_result->init, 1);
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}
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init = 1;
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}
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else
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value = reloc_result->addr;
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/* By default we do not call the pltexit function. */
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long int framesize = -1;
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#ifdef SHARED
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/* Auditing checkpoint: report the PLT entering and allow the
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auditors to change the value. */
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if (GLRO(dl_naudit) > 0
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/* Don't do anything if no auditor wants to intercept this call. */
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&& (reloc_result->enterexit & LA_SYMB_NOPLTENTER) == 0)
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{
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/* Sanity check: DL_FIXUP_VALUE_CODE_ADDR (value) should have been
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initialized earlier in this function or in another thread. */
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assert (DL_FIXUP_VALUE_CODE_ADDR (value) != 0);
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ElfW(Sym) *defsym = ((ElfW(Sym) *) D_PTR (reloc_result->bound,
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l_info[DT_SYMTAB])
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+ reloc_result->boundndx);
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/* Set up the sym parameter. */
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ElfW(Sym) sym = *defsym;
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sym.st_value = DL_FIXUP_VALUE_ADDR (value);
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/* Get the symbol name. */
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const char *strtab = (const void *) D_PTR (reloc_result->bound,
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l_info[DT_STRTAB]);
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const char *symname = strtab + sym.st_name;
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/* Keep track of overwritten addresses. */
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unsigned int flags = reloc_result->flags;
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struct audit_ifaces *afct = GLRO(dl_audit);
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for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
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{
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if (afct->ARCH_LA_PLTENTER != NULL
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&& (reloc_result->enterexit
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& (LA_SYMB_NOPLTENTER << (2 * (cnt + 1)))) == 0)
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{
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long int new_framesize = -1;
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struct auditstate *l_state = link_map_audit_state (l, cnt);
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struct auditstate *bound_state
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= link_map_audit_state (reloc_result->bound, cnt);
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uintptr_t new_value
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= afct->ARCH_LA_PLTENTER (&sym, reloc_result->boundndx,
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&l_state->cookie,
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&bound_state->cookie,
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regs, &flags, symname,
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&new_framesize);
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if (new_value != (uintptr_t) sym.st_value)
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{
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flags |= LA_SYMB_ALTVALUE;
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sym.st_value = new_value;
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}
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/* Remember the results for every audit library and
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store a summary in the first two bits. */
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reloc_result->enterexit
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|= ((flags & (LA_SYMB_NOPLTENTER | LA_SYMB_NOPLTEXIT))
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<< (2 * (cnt + 1)));
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if ((reloc_result->enterexit & (LA_SYMB_NOPLTEXIT
|
|
<< (2 * (cnt + 1))))
|
|
== 0 && new_framesize != -1 && framesize != -2)
|
|
{
|
|
/* If this is the first call providing information,
|
|
use it. */
|
|
if (framesize == -1)
|
|
framesize = new_framesize;
|
|
/* If two pltenter calls provide conflicting information,
|
|
use the larger value. */
|
|
else if (new_framesize != framesize)
|
|
framesize = MAX (new_framesize, framesize);
|
|
}
|
|
}
|
|
|
|
afct = afct->next;
|
|
}
|
|
|
|
value = DL_FIXUP_ADDR_VALUE (sym.st_value);
|
|
}
|
|
#endif
|
|
|
|
/* Store the frame size information. */
|
|
*framesizep = framesize;
|
|
|
|
(*mcount_fct) (retaddr, DL_FIXUP_VALUE_CODE_ADDR (value));
|
|
|
|
return value;
|
|
}
|
|
|
|
#endif /* PROF */
|
|
|
|
|
|
#include <stdio.h>
|
|
void
|
|
ARCH_FIXUP_ATTRIBUTE
|
|
_dl_call_pltexit (struct link_map *l, ElfW(Word) reloc_arg,
|
|
const void *inregs, void *outregs)
|
|
{
|
|
#ifdef SHARED
|
|
/* This is the address in the array where we store the result of previous
|
|
relocations. */
|
|
// XXX Maybe the bound information must be stored on the stack since
|
|
// XXX with bind_not a new value could have been stored in the meantime.
|
|
struct reloc_result *reloc_result = &l->l_reloc_result[reloc_index];
|
|
ElfW(Sym) *defsym = ((ElfW(Sym) *) D_PTR (reloc_result->bound,
|
|
l_info[DT_SYMTAB])
|
|
+ reloc_result->boundndx);
|
|
|
|
/* Set up the sym parameter. */
|
|
ElfW(Sym) sym = *defsym;
|
|
sym.st_value = DL_FIXUP_VALUE_ADDR (reloc_result->addr);
|
|
|
|
/* Get the symbol name. */
|
|
const char *strtab = (const void *) D_PTR (reloc_result->bound,
|
|
l_info[DT_STRTAB]);
|
|
const char *symname = strtab + sym.st_name;
|
|
|
|
struct audit_ifaces *afct = GLRO(dl_audit);
|
|
for (unsigned int cnt = 0; cnt < GLRO(dl_naudit); ++cnt)
|
|
{
|
|
if (afct->ARCH_LA_PLTEXIT != NULL
|
|
&& (reloc_result->enterexit
|
|
& (LA_SYMB_NOPLTEXIT >> (2 * cnt))) == 0)
|
|
{
|
|
struct auditstate *l_state = link_map_audit_state (l, cnt);
|
|
struct auditstate *bound_state
|
|
= link_map_audit_state (reloc_result->bound, cnt);
|
|
afct->ARCH_LA_PLTEXIT (&sym, reloc_result->boundndx,
|
|
&l_state->cookie, &bound_state->cookie,
|
|
inregs, outregs, symname);
|
|
}
|
|
|
|
afct = afct->next;
|
|
}
|
|
#endif
|
|
}
|