From 36f46b0e36892eba08978eef7502ff3c94ddba77 Mon Sep 17 00:00:00 2001 From: Thorsten Blum Date: Sat, 28 Feb 2026 00:00:09 +0100 Subject: [PATCH] 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 Cc: Baoquan He Cc: Coiby Xu Cc: Dave Young Cc: Vivek Goyal Cc: Signed-off-by: Andrew Morton --- kernel/crash_dump_dm_crypt.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/crash_dump_dm_crypt.c b/kernel/crash_dump_dm_crypt.c index 1f4067fbdb94..a20d4097744a 100644 --- a/kernel/crash_dump_dm_crypt.c +++ b/kernel/crash_dump_dm_crypt.c @@ -168,8 +168,8 @@ static int read_key_from_user_keying(struct dm_crypt_key *dm_key) memcpy(dm_key->data, ukp->data, ukp->datalen); dm_key->key_size = ukp->datalen; - kexec_dprintk("Get dm crypt key (size=%u) %s: %8ph\n", dm_key->key_size, - dm_key->key_desc, dm_key->data); + kexec_dprintk("Get dm crypt key (size=%u) %s\n", dm_key->key_size, + dm_key->key_desc); out: up_read(&key->sem);