diff options
| author | Timo Teräs <timo.teras@iki.fi> | 2013-01-08 11:55:26 +0200 |
|---|---|---|
| committer | Bernhard Reutner-Fischer <rep.dot.nop@gmail.com> | 2013-01-09 10:10:09 +0100 |
| commit | df3a5fcc8d1c3402289375c92df705e978fab58d (patch) | |
| tree | d6ce9241c8d13c36c18fd7243612244d440991c6 /ldso/libdl | |
| parent | 0c3eb2da578bc7ba2e74d240e3249dce62ec725e (diff) | |
dl: fix dlsym lookups with RTLD_NEXT
The current code for dlsym() when invoked with RTLD_NEXT lookup
searches for the module where it's being called from, and executes the
_dl_find_hash only for the next module in the chain. However, if the
looked symbol is not there, the rest of the modules are not checked.
Generally this is not a problem as symbols are merged for the parent
modules; so this affects only RTLD_NEXT.
This patch adds a loop iterating through all the following modules.
Signed-off-by: Timo Teräs <timo.teras@iki.fi>
Reviewed-by: Filippo ARCIDIACONO <filippo.arcidiacono@st.com>
Tested-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Diffstat (limited to 'ldso/libdl')
| -rw-r--r-- | ldso/libdl/libdl.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/ldso/libdl/libdl.c b/ldso/libdl/libdl.c index 8bc3071da..233722382 100644 --- a/ldso/libdl/libdl.c +++ b/ldso/libdl/libdl.c @@ -671,7 +671,7 @@ static void *do_dlsym(void *vhandle, const char *name, void *caller_address) { struct elf_resolve *tpnt, *tfrom; struct dyn_elf *handle; - ElfW(Addr) from; + ElfW(Addr) from = 0; struct dyn_elf *rpnt; void *ret; struct symbol_ref sym_ref = { NULL, NULL }; @@ -729,7 +729,13 @@ static void *do_dlsym(void *vhandle, const char *name, void *caller_address) tpnt = NULL; if (handle == _dl_symbol_tables) tpnt = handle->dyn; /* Only search RTLD_GLOBAL objs if global object */ - ret = _dl_find_hash(name2, &handle->dyn->symbol_scope, tpnt, ELF_RTYPE_CLASS_DLSYM, &sym_ref); + + do { + ret = _dl_find_hash(name2, &handle->dyn->symbol_scope, tpnt, ELF_RTYPE_CLASS_DLSYM, &sym_ref); + if (ret != NULL) + break; + handle = handle->next; + } while (from && handle); #if defined(USE_TLS) && USE_TLS && defined SHARED if (sym_ref.sym && (ELF_ST_TYPE(sym_ref.sym->st_info) == STT_TLS) && (sym_ref.tpnt)) { |