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Remove all loaded objects if dlopen fails, ignoring NODELETE [BZ #20839]

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This introduces a “pending NODELETE” state in the link map, which is
flipped to the persistent NODELETE state late in dlopen, via
activate_nodelete.    During initial relocation, symbol binding
records pending NODELETE state only.  dlclose ignores pending NODELETE
state.  Taken together, this results that a partially completed dlopen
is rolled back completely because new NODELETE mappings are unloaded.

Tested on x86_64-linux-gnu and i386-linux-gnu.

Change-Id: Ib2a3d86af6f92d75baca65431d74783ee0dbc292
This commit is contained in:
Florian Weimer
2019-11-13 15:44:56 +01:00
parent a509eb117f
commit f63b73814f
10 changed files with 328 additions and 38 deletions
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2
elf/get-dynamic-info.h
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@ -163,6 +163,8 @@ elf_get_dynamic_info (struct link_map *l, ElfW(Dyn) *temp)
if (info[VERSYMIDX (DT_FLAGS_1)] != NULL)
{
l->l_flags_1 = info[VERSYMIDX (DT_FLAGS_1)]->d_un.d_val;
if (l->l_flags_1 & DF_1_NODELETE)
l->l_nodelete = link_map_nodelete_pending;
/* Only DT_1_SUPPORTED_MASK bits are supported, and we would like
to assert this, but we can't. Users have been setting