binutils-gdb

Tree: 986e9e3aa0

History

Nick Alcock 986e9e3aa0 libctf: do not corrupt strings across ctf_serialize The preceding change revealed a new bug: the string table is sorted for better compression, so repeated serialization with type (or member) additions in the middle can move strings around. But every serialization flushes the set of refs (the memory locations that are automatically updated with a final string offset when the strtab is updated), so if we are not to have string offsets go stale, we must do all ref additions within the serialization code (which walks the complete set of types and symbols anyway). Unfortunately, we were adding one ref in another place: the type name in the dynamic type definitions, which has a ref added to it by ctf_add_generic. So adding a type, serializing (via, say, one of the ctf_write functions), adding another type with a name that sorts earlier, and serializing again will corrupt the name of the first type because it no longer had a ref pointing to its dtd entry's name when its string offset was shifted later in the strtab to mae way for the other type. To ensure that we don't miss strings, we also maintain a set of pending refs that will be added later (during serialization), and remove entries from that set when the ref is finally added. We always use ctf_str_add_pending outside ctf-serialize.c, ensure that ctf_serialize adds all strtab offsets as refs (even those in the dtds) on every serialization, and mandate that no refs are live on entry to ctf_serialize and that all pending refs are gone before strtab finalization. (Of necessity ctf_serialize has to traverse all strtab offsets in the dtds in order to serialize them, so adding them as refs at the same time is easy.) (Note that we still can't erase unused atoms when we roll back, though we can erase unused refs: members and enums are still not removed by rollbacks and might reference strings added after the snapshot.) libctf/ChangeLog 2021-03-18 Nick Alcock <nick.alcock@oracle.com> * ctf-hash.c (ctf_dynset_elements): New. * ctf-impl.h (ctf_dynset_elements): Declare it. (ctf_str_add_pending): Likewise. (ctf_dict_t) <ctf_str_pending_ref>: New, set of refs that must be added during serialization. * ctf-string.c (ctf_str_create_atoms): Initialize it. (CTF_STR_ADD_REF): New flag. (CTF_STR_MAKE_PROVISIONAL): Likewise. (CTF_STR_PENDING_REF): Likewise. (ctf_str_add_ref_internal): Take a flags word rather than int params. Populate, and clear out, ctf_str_pending_ref. (ctf_str_add): Adjust accordingly. (ctf_str_add_external): Likewise. (ctf_str_add_pending): New. (ctf_str_remove_ref): Also remove the potential ref if it is a pending ref. * ctf-serialize.c (ctf_serialize): Prohibit addition of strings with ctf_str_add_ref before serialization. Ensure that the ctf_str_pending_ref set is empty before strtab finalization. (ctf_emit_type_sect): Add a ref to the ctt_name. * ctf-create.c (ctf_add_generic): Add the ctt_name as a pending ref. * testsuite/libctf-writable/reserialize-strtab-corruption.*: New test.		5 years ago
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config	Include ld-lib.exp from ctf-lib.exp	5 years ago
lib	Include ld-lib.exp from ctf-lib.exp	5 years ago
libctf-lookup	libctf: fix some tabdamage and move some code around	5 years ago
libctf-regression	libctf: fix some tabdamage and move some code around	5 years ago
libctf-writable	libctf: do not corrupt strings across ctf_serialize	5 years ago