[autobackport: sssd-2-9] KCM: fix TGT renewal use-after-free and stabilize test - #9016
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alexey-tikhonov merged 3 commits intoJul 28, 2026
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July 28, 2026 19:01
auth_data->ccname pointed at cc->name on a short-lived tmp_ctx that is freed before the tevent immediate renewal callback runs. Copy the name onto auth_data so krb5_child renews the correct KCM ccache. Co-authored-by: Cursor <cursoragent@cursor.com> Model used: Cursor Sonnet 5 Reviewed-by: Alexey Tikhonov <atikhono@redhat.com> Reviewed-by: Justin Stephenson <jstephen@redhat.com> (cherry picked from commit 2373a46)
Avoid leaking the partially initialized auth_data when strdup or tevent_create_immediate fails in kcm_creds_check_times(). Co-authored-by: Cursor <cursoragent@cursor.com> Model used: Cursor Sonnet 5 Reviewed-by: Alexey Tikhonov <atikhono@redhat.com> Reviewed-by: Justin Stephenson <jstephen@redhat.com> (cherry picked from commit 854dcda)
Use a 10s lifetime and 30s renewable life so renew_till stays past endtime, and poll for half-life plus slack after the UAF fix. Co-authored-by: Cursor <cursoragent@cursor.com> Model used: Cursor Sonnet 5 Reviewed-by: Alexey Tikhonov <atikhono@redhat.com> Reviewed-by: Justin Stephenson <jstephen@redhat.com> (cherry picked from commit 3efe248)
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This is an automatic backport of PR#9005 KCM: fix TGT renewal use-after-free and stabilize test to branch sssd-2-9, created by @danlavu.
Please make sure this backport is correct.
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Original commits
2373a46 - KCM: fix use-after-free of ccache name during TGT renewal
854dcda - KCM: free auth_data on TGT renewal setup failure
3efe248 - tests: widen KCM TGT renewal poll window
Backported commits
Original Pull Request Body
auth_data->ccnamepointed at a short-livedtmp_ctxccache name freed before the tevent renewal callback (caused flaky renewals against bogus names likeKCM:p).auth_dataon strdup /tevent_create_immediatefailure paths.Replaces the exploratory work in #8857.
Co-authored-by: Cursor cursoragent@cursor.com
Model used: Cursor Sonnet 5