tjh.dev / kernel
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crash_dump: don't log dm-crypt key bytes in read_key_from_user_keying

When debug logging is enabled, read_key_from_user_keying() logs the first
8 bytes of the key payload and partially exposes the dm-crypt key. Stop
logging any key bytes.

Link: https://lkml.kernel.org/r/20260227230008.858641-2-thorsten.blum@linux.dev
Fixes: 479e58549b0f ("crash_dump: store dm crypt keys in kdump reserved memory")
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Cc: Baoquan He <bhe@redhat.com>
Cc: Coiby Xu <coxu@redhat.com>
Cc: Dave Young <dyoung@redhat.com>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

authored by

Thorsten Blum and committed by
Andrew Morton 36f46b0e b4f0dd31

+2 -2
+2 -2
kernel/crash_dump_dm_crypt.c
··· 168 168 169 169 memcpy(dm_key->data, ukp->data, ukp->datalen); 170 170 dm_key->key_size = ukp->datalen; 171 - kexec_dprintk("Get dm crypt key (size=%u) %s: %8ph\n", dm_key->key_size, 172 - dm_key->key_desc, dm_key->data); 171 + kexec_dprintk("Get dm crypt key (size=%u) %s\n", dm_key->key_size, 172 + dm_key->key_desc); 173 173 174 174 out: 175 175 up_read(&key->sem);