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Fix potential problem with skipping relocations
We never seem to have hit this problem but way relative relocations were skipped was wrong. There are relative relocations only in the DT_REL/DT_RELA section. The elf_dynamic_do_##reloc function skipped the entries in all calls, though.
This commit is contained in:
Ulrich Drepper
parent
79b195b55a
commit
e453f6cd0c
@ -1,3 +1,12 @@
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2011-10-16 Ulrich Drepper <drepper@gmail.com>
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* elf/do-rel.h: Add another parameter nrelative, replacing the
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local variable with the same name. Change name of the function
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to end in Rel or Rela (uppercase).
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* elf/dynamic-link.h (_ELF_DYNAMIC_DO_RELOC): Add new element
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nrelative to ranges. Only nonzero for DT_REL/DT_RELA. Pass to the
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elf_dynamic_do_##reloc function.
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2011-10-15 Ulrich Drepper <drepper@gmail.com>
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* sysdeps/i386/i686/fpu/e_log.S: No need for the fyl2xp1 use, fyl2x
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17
elf/do-rel.h
17
elf/do-rel.h
@ -21,13 +21,10 @@
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`elf_dynamic_do_rel' and `elf_dynamic_do_rela'. */
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#ifdef DO_RELA
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# define elf_dynamic_do_rel elf_dynamic_do_rela
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# define RELCOUNT_IDX VERSYMIDX (DT_RELACOUNT)
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# define elf_dynamic_do_Rel elf_dynamic_do_Rela
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# define Rel Rela
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# define elf_machine_rel elf_machine_rela
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# define elf_machine_rel_relative elf_machine_rela_relative
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#else
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# define RELCOUNT_IDX VERSYMIDX (DT_RELCOUNT)
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#endif
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#ifndef DO_ELF_MACHINE_REL_RELATIVE
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@ -50,9 +47,9 @@
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than fully resolved now. */
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auto inline void __attribute__ ((always_inline))
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elf_dynamic_do_rel (struct link_map *map,
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elf_dynamic_do_Rel (struct link_map *map,
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ElfW(Addr) reladdr, ElfW(Addr) relsize,
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int lazy, int skip_ifunc)
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ElfW(Word) nrelative, int lazy, int skip_ifunc)
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{
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const ElfW(Rel) *r = (const void *) reladdr;
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const ElfW(Rel) *end = (const void *) (reladdr + relsize);
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@ -73,10 +70,8 @@ elf_dynamic_do_rel (struct link_map *map,
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{
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const ElfW(Sym) *const symtab =
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(const void *) D_PTR (map, l_info[DT_SYMTAB]);
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ElfW(Word) nrelative = (map->l_info[RELCOUNT_IDX] == NULL
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? 0 : map->l_info[RELCOUNT_IDX]->d_un.d_val);
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const ElfW(Rel) *relative = r;
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r = r + MIN (nrelative, relsize / sizeof (ElfW(Rel)));
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r += nrelative;
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#ifndef RTLD_BOOTSTRAP
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/* This is defined in rtld.c, but nowhere in the static libc.a; make
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@ -131,9 +126,9 @@ elf_dynamic_do_rel (struct link_map *map,
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}
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}
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#undef elf_dynamic_do_rel
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#undef elf_dynamic_do_Rel
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#undef Rel
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#undef elf_machine_rel
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#undef elf_machine_rel_relative
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#undef DO_ELF_MACHINE_REL_RELATIVE
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#undef RELCOUNT_IDX
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#undef DO_RELA
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@ -258,17 +258,23 @@ elf_get_dynamic_info (struct link_map *l, ElfW(Dyn) *temp)
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# ifdef ELF_MACHINE_PLTREL_OVERLAP
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# define _ELF_DYNAMIC_DO_RELOC(RELOC, reloc, map, do_lazy, skip_ifunc, test_rel) \
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do { \
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struct { ElfW(Addr) start, size; int lazy; } ranges[3]; \
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struct { ElfW(Addr) start, size; ElfW(Word) nrelative; int lazy; } \
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ranges[3]; \
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int ranges_index; \
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\
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ranges[0].lazy = ranges[2].lazy = 0; \
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ranges[1].lazy = 1; \
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ranges[0].size = ranges[1].size = ranges[2].size = 0; \
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ranges[0].nrelative = ranges[1].nrelative = ranges[2].nrelative = 0; \
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\
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if ((map)->l_info[DT_##RELOC]) \
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{ \
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ranges[0].start = D_PTR ((map), l_info[DT_##RELOC]); \
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ranges[0].size = (map)->l_info[DT_##RELOC##SZ]->d_un.d_val; \
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if (map->l_info[VERSYMIDX (DT_##RELOC##COUNT)] != NULL) \
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ranges[0].nrelative \
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= MIN (map->l_info[VERSYMIDX (DT_##RELOC##COUNT)]->d_un.d_val, \
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ranges[0].size / sizeof (ElfW(reloc))); \
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} \
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\
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if ((do_lazy) \
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@ -286,21 +292,24 @@ elf_get_dynamic_info (struct link_map *l, ElfW(Dyn) *temp)
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elf_dynamic_do_##reloc ((map), \
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ranges[ranges_index].start, \
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ranges[ranges_index].size, \
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ranges[ranges_index].nrelative, \
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ranges[ranges_index].lazy, \
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skip_ifunc); \
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} while (0)
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# else
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# define _ELF_DYNAMIC_DO_RELOC(RELOC, reloc, map, do_lazy, skip_ifunc, test_rel) \
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do { \
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struct { ElfW(Addr) start, size; int lazy; } ranges[2]; \
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ranges[0].lazy = 0; \
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ranges[0].size = ranges[1].size = 0; \
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ranges[0].start = 0; \
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struct { ElfW(Addr) start, size; ElfW(Word) nrelative; int lazy; } \
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ranges[2] = { { 0, 0, 0, 0 }, { 0, 0, 0, 0 } }; \
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\
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if ((map)->l_info[DT_##RELOC]) \
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{ \
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ranges[0].start = D_PTR ((map), l_info[DT_##RELOC]); \
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ranges[0].size = (map)->l_info[DT_##RELOC##SZ]->d_un.d_val; \
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if (map->l_info[VERSYMIDX (DT_##RELOC##COUNT)] != NULL) \
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ranges[0].nrelative \
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= MIN (map->l_info[VERSYMIDX (DT_##RELOC##COUNT)]->d_un.d_val, \
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ranges[0].size / sizeof (ElfW(reloc))); \
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} \
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if ((map)->l_info[DT_PLTREL] \
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&& (!test_rel || (map)->l_info[DT_PLTREL]->d_un.d_val == DT_##RELOC)) \
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@ -312,7 +321,8 @@ elf_get_dynamic_info (struct link_map *l, ElfW(Dyn) *temp)
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/* This test does not only detect whether the relocation \
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sections are in the right order, it also checks whether \
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there is a DT_REL/DT_RELA section. */ \
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|| ranges[0].start + ranges[0].size != start)) \
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|| __builtin_expect (ranges[0].start + ranges[0].size \
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!= start, 0))) \
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{ \
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ranges[1].start = start; \
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ranges[1].size = (map)->l_info[DT_PLTRELSZ]->d_un.d_val; \
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@ -327,8 +337,8 @@ elf_get_dynamic_info (struct link_map *l, ElfW(Dyn) *temp)
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} \
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\
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if (ELF_DURING_STARTUP) \
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elf_dynamic_do_##reloc ((map), ranges[0].start, ranges[0].size, 0, \
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skip_ifunc); \
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elf_dynamic_do_##reloc ((map), ranges[0].start, ranges[0].size, \
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ranges[0].nrelative, 0, skip_ifunc); \
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else \
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{ \
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int ranges_index; \
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@ -336,6 +346,7 @@ elf_get_dynamic_info (struct link_map *l, ElfW(Dyn) *temp)
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elf_dynamic_do_##reloc ((map), \
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ranges[ranges_index].start, \
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ranges[ranges_index].size, \
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ranges[ranges_index].nrelative, \
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ranges[ranges_index].lazy, \
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skip_ifunc); \
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} \
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@ -351,7 +362,7 @@ elf_get_dynamic_info (struct link_map *l, ElfW(Dyn) *temp)
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# if ! ELF_MACHINE_NO_REL
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# include "do-rel.h"
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# define ELF_DYNAMIC_DO_REL(map, lazy, skip_ifunc) \
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_ELF_DYNAMIC_DO_RELOC (REL, rel, map, lazy, skip_ifunc, _ELF_CHECK_REL)
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_ELF_DYNAMIC_DO_RELOC (REL, Rel, map, lazy, skip_ifunc, _ELF_CHECK_REL)
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# else
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# define ELF_DYNAMIC_DO_REL(map, lazy, skip_ifunc) /* Nothing to do. */
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# endif
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@ -360,7 +371,7 @@ elf_get_dynamic_info (struct link_map *l, ElfW(Dyn) *temp)
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# define DO_RELA
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# include "do-rel.h"
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# define ELF_DYNAMIC_DO_RELA(map, lazy, skip_ifunc) \
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_ELF_DYNAMIC_DO_RELOC (RELA, rela, map, lazy, skip_ifunc, _ELF_CHECK_REL)
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_ELF_DYNAMIC_DO_RELOC (RELA, Rela, map, lazy, skip_ifunc, _ELF_CHECK_REL)
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# else
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# define ELF_DYNAMIC_DO_RELA(map, lazy, skip_ifunc) /* Nothing to do. */
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# endif
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