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With krb5-1.20.1-5.el9, the following double free error occurs:
# /usr/sbin/kdb5_util create -s -P Secret123 -k arcfour-hmac
Initializing database '/var/kerberos/krb5kdc/principal' for realm 'TEST.COM',
master key name 'K/M'
double free or corruption (fasttop)
Aborted (core dumped)
Here is valgrind output:
# valgrind --track-origins=yes --keep-stacktraces=alloc-and-free -- /usr/sbin/kdb5_util create -s -P <password> -k arcfour-hmac
...
==3559== Invalid free() / delete / delete[] / realloc()
==3559== at 0x48470E4: free (vg_replace_malloc.c:872)
==3559== by 0x48826B9: krb5_dbe_free_key_data_contents (kdb5.c:127)
==3559== by 0x4883B06: krb5_db_free_principal (kdb5.c:844)
==3559== by 0x1183F5: add_principal.constprop.0 (kdb5_create.c:476)
==3559== by 0x118837: kdb5_create (kdb5_create.c:292)
==3559== by 0x10E869: main (kdb5_util.c:344)
==3559== Address 0x67a7260 is 0 bytes inside a block of size 42 free'd
==3559== at 0x48470E4: free (vg_replace_malloc.c:872)
==3559== by 0x48811C8: krb5_dbe_def_encrypt_key_data (encrypt_key.c:111)
==3559== by 0x1184B4: add_principal.constprop.0 (kdb5_create.c:427)
==3559== by 0x118837: kdb5_create (kdb5_create.c:292)
==3559== by 0x10E869: main (kdb5_util.c:344)
==3559== Block was alloc'd at
==3559== at 0x484486F: malloc (vg_replace_malloc.c:381)
==3559== by 0x4881105: krb5_dbe_def_encrypt_key_data (encrypt_key.c:92)
==3559== by 0x1184B4: add_principal.constprop.0 (kdb5_create.c:427)
==3559== by 0x118837: kdb5_create (kdb5_create.c:292)
==3559== by 0x10E869: main (kdb5_util.c:344)
...
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (Moderate: krb5 security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHSA-2023:2570