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* [Bug network/31026] New: Reachable assertion in resolv_conf.c:570: update_from_conf: Assertion `resolv_conf_matches (resp, conf)' failed.
@ 2023-11-02 10:56 joshua at joshua dot hu
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From: joshua at joshua dot hu @ 2023-11-02 10:56 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=31026
Bug ID: 31026
Summary: Reachable assertion in resolv_conf.c:570:
update_from_conf: Assertion `resolv_conf_matches
(resp, conf)' failed.
Product: glibc
Version: 2.40
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: network
Assignee: unassigned at sourceware dot org
Reporter: joshua at joshua dot hu
Target Milestone: ---
Flags: security?
Hi there,
There is a reachable assert in resolv/resolv_conf.c:update_from_conf:
/* The overlapping parts of both configurations should agree after
initialization. */
assert (resolv_conf_matches (resp, conf));
resolv_conf_matches returns negative in the case of:
/* resp->dnsrch is truncated if the number of elements
exceeds MAXDNSRCH, or if the combined storage space for
the search list exceeds what can be stored in
resp->defdname. */
if (i == MAXDNSRCH || search_list_size > sizeof (resp->dnsrch))
break;
/* Otherwise, a mismatch indicates a match failure. */
return false;
}
Specifically, if the combined storage space for the search line is in excess,
it is already truncated update_from_conf:
for (i = 0; i < size && i < MAXDNSRCH; ++i)
{
resp->dnsrch[i] = alloc_buffer_copy_string
(&buffer, conf->search_list[i]);
if (resp->dnsrch[i] == NULL)
/* No more space in resp->defdname. Truncate. */
break;
}
resp->dnsrch[i] = NULL;
}
An example:
echo "search example.org example.com example.net
corp.corp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.examcorp.exam"
>> /etc/resolv.conf
# ping example.com
ping: resolv_conf.c:570: update_from_conf: Assertion `resolv_conf_matches
(resp, conf)' failed.
Aborted
Cheers,
Josh
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