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elf: Properly handle zero DT_RELA/DT_REL values
With DT_RELR, there may be no relocations in DT_RELA/DT_REL and their entry values are zero. Don't relocate DT_RELA/DT_REL and update the combined relocation start address if their entry values are zero.
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@ -84,7 +84,9 @@ elf_machine_lazy_rel (struct link_map *map, struct r_scope_elem *scope[],
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__typeof (((ElfW(Dyn) *) 0)->d_un.d_val) 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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/* With DT_RELR, DT_RELA/DT_REL can have zero value. */ \
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if ((map)->l_info[DT_##RELOC] != NULL \
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&& (map)->l_info[DT_##RELOC]->d_un.d_ptr != 0) \
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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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@ -98,6 +100,8 @@ elf_machine_lazy_rel (struct link_map *map, struct r_scope_elem *scope[],
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ElfW(Addr) start = D_PTR ((map), l_info[DT_JMPREL]); \
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ElfW(Addr) size = (map)->l_info[DT_PLTRELSZ]->d_un.d_val; \
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\
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if (ranges[0].start == 0) \
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ranges[0].start = start; \
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if (ranges[0].start + ranges[0].size == (start + size)) \
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ranges[0].size -= size; \
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if (!(do_lazy) \
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@ -75,24 +75,36 @@ elf_get_dynamic_info (struct link_map *l, bool bootstrap,
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# define ADJUST_DYN_INFO(tag) \
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do \
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if (info[tag] != NULL) \
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info[tag]->d_un.d_ptr += l_addr; \
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{ \
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if (info[tag] != NULL) \
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info[tag]->d_un.d_ptr += l_addr; \
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} \
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while (0)
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ADJUST_DYN_INFO (DT_HASH);
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ADJUST_DYN_INFO (DT_PLTGOT);
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ADJUST_DYN_INFO (DT_STRTAB);
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ADJUST_DYN_INFO (DT_SYMTAB);
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ADJUST_DYN_INFO (DT_RELR);
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ADJUST_DYN_INFO (DT_JMPREL);
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ADJUST_DYN_INFO (VERSYMIDX (DT_VERSYM));
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ADJUST_DYN_INFO (ADDRIDX (DT_GNU_HASH));
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# undef ADJUST_DYN_INFO
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/* DT_RELA/DT_REL are mandatory. But they may have zero value if
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there is DT_RELR. Don't relocate them if they are zero. */
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# define ADJUST_DYN_INFO(tag) \
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do \
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if (info[tag] != NULL && info[tag]->d_un.d_ptr != 0) \
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info[tag]->d_un.d_ptr += l_addr; \
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while (0)
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# if ! ELF_MACHINE_NO_RELA
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ADJUST_DYN_INFO (DT_RELA);
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# endif
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# if ! ELF_MACHINE_NO_REL
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ADJUST_DYN_INFO (DT_REL);
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# endif
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ADJUST_DYN_INFO (DT_RELR);
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ADJUST_DYN_INFO (DT_JMPREL);
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ADJUST_DYN_INFO (VERSYMIDX (DT_VERSYM));
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ADJUST_DYN_INFO (ADDRIDX (DT_GNU_HASH));
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# undef ADJUST_DYN_INFO
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}
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if (info[DT_PLTREL] != NULL)
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