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ldso: correct condition for local symbol handling in do_relocs

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commit 7a9669e977 added use of the
symbol reference as the definition, in place of performing a lookup,
for STT_SECTION symbol references that were first found used in FDPIC.
such references may happen in certain other cases, such as
local-dynamic TLS and with relocation types that require a symbol but
that are being used for non-symbolic purposes, like the powerpc
unaligned address relocations.

in all such cases I'm aware of, the symbol referenced is a section
symbol (STT_SECTION); however, the important semantic property is not
its being a section, but rather its binding local (STB_LOCAL). check
the latter instead of the former for greater generality and semantic
correctness.
This commit is contained in:
Rich Felker 2019-08-12 18:19:38 -04:00
parent 08869deb7e
commit 1f060ed2fb
1 changed files with 1 additions and 1 deletions
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2
ldso/dynlink.c
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@ -363,7 +363,7 @@ static void do_relocs(struct dso *dso, size_t *rel, size_t rel_size, size_t stri
sym = syms + sym_index;
name = strings + sym->st_name;
ctx = type==REL_COPY ? head->syms_next : head;
def = (sym->st_info&0xf) == STT_SECTION
def = (sym->st_info>>4) == STB_LOCAL
? (struct symdef){ .dso = dso, .sym = sym }
: find_sym(ctx, name, type==REL_PLT);
if (!def.sym && (sym->st_shndx != SHN_UNDEF