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When for some reasons, c-ares is using tcp for DNS queries, SSSD will crash. This is caused by the fact that c-ares calls our fd_event() callback when it is in the middle of processing of a query. The fd_event() function will then call ares_process_fd() which will again call the fd_event() callback. This recursion will then lead into a crash.
Fields changed
milestone: NEEDS_TRIAGE => SSSD 1.0.2 priority: critical => blocker tests: 0 => 1
Fixed by 995d269
fixedin: => 1.0.2 resolution: => fixed status: new => closed
Please add steps to reproduce this segfault. Thx.
Steps to reproduce: 1) Set up a DNS server with a hostname with many (100+) IP addresses. For example, I set up lotsaips.example.com pointing at 172.16.0.[1-255] 2) Edit the /etc/resolv.conf on the system so that this DNS server is the primary 3) Use this hostname for the ldap_uri.
This is because DNS responses over a certain size will return the TRUNCATED flags, and c-ares will then attempt to use TCP to complete the transaction.
tests: 1 => 0 testsupdated: 0 => 1
rhbz: => 0
Metadata Update from @mnagy: - Issue assigned to mnagy - Issue set to the milestone: SSSD 1.0.2
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This issue has been cloned to Github and is available here: - https://github.com/SSSD/sssd/issues/1426
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