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https://github.com/frida/tinycc
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Do not add symbol if it is already there
Do not create a new symbol in add_elf_sym if a symbol with same properties (value, size, info, etc.) already exists. This prevents symbols from being exported twice in the dynamic symbol table.
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parent
bf692af31b
commit
e9769a7249
13
tccelf.c
13
tccelf.c
@ -394,12 +394,17 @@ ST_FUNC int add_elf_sym(Section *s, addr_t value, unsigned long size,
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sym_type = ELFW(ST_TYPE)(info);
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sym_vis = ELFW(ST_VISIBILITY)(other);
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sym_index = find_elf_sym(s, name);
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esym = &((ElfW(Sym) *)s->data)[sym_index];
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if (sym_index && esym->st_value == value && esym->st_size == size
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&& esym->st_info == info && esym->st_other == other
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&& esym->st_shndx == sh_num)
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return sym_index;
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if (sym_bind != STB_LOCAL) {
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/* we search global or weak symbols */
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sym_index = find_elf_sym(s, name);
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if (!sym_index)
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goto do_def;
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esym = &((ElfW(Sym) *)s->data)[sym_index];
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if (esym->st_shndx != SHN_UNDEF) {
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esym_bind = ELFW(ST_BIND)(esym->st_info);
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/* propagate the most constraining visibility */
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@ -2058,7 +2063,7 @@ static void bind_exe_dynsyms(TCCState *s1)
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} else if (s1->rdynamic && ELFW(ST_BIND)(sym->st_info) != STB_LOCAL) {
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/* if -rdynamic option, then export all non local symbols */
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name = (char *) symtab_section->link->data + sym->st_name;
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put_elf_sym(s1->dynsym, sym->st_value, sym->st_size, sym->st_info,
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add_elf_sym(s1->dynsym, sym->st_value, sym->st_size, sym->st_info,
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0, sym->st_shndx, name);
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}
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}
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@ -2081,7 +2086,7 @@ static void bind_libs_dynsyms(TCCState *s1)
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-rdynamic ? */
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sym = &((ElfW(Sym) *)symtab_section->data)[sym_index];
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if (sym_index && sym->st_shndx != SHN_UNDEF)
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put_elf_sym(s1->dynsym, sym->st_value, sym->st_size, sym->st_info,
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add_elf_sym(s1->dynsym, sym->st_value, sym->st_size, sym->st_info,
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0, sym->st_shndx, name);
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else if (esym->st_shndx == SHN_UNDEF) {
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/* weak symbols can stay undefined */
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