diff options
| author | Enzo Matsumiya <ematsumiya@suse.de> | 2022-09-20 15:10:35 -0300 |
|---|---|---|
| committer | Steve French <stfrench@microsoft.com> | 2022-10-07 23:06:48 -0500 |
| commit | a4e430c8c8ba96be8c6ec4f2eb108bb8bcbee069 (patch) | |
| tree | ff8fb70c06b5dd58f6c8d89a0b5d4d19c5a4fc5d /fs/cifs/sess.c | |
| parent | f5823f5ee36040c2a8b8b36afe0783fe0bd7ad14 (diff) | |
cifs: replace kfree() with kfree_sensitive() for sensitive data
Replace kfree with kfree_sensitive, or prepend memzero_explicit() in
other cases, when freeing sensitive material that could still be left
in memory.
Signed-off-by: Enzo Matsumiya <ematsumiya@suse.de>
Reported-by: kernel test robot <oliver.sang@intel.com>
Link: https://lore.kernel.org/r/202209201529.ec633796-oliver.sang@intel.com
Reviewed-by: Paulo Alcantara (SUSE) <pc@cjr.nz>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs/cifs/sess.c')
| -rw-r--r-- | fs/cifs/sess.c | 24 |
1 files changed, 15 insertions, 9 deletions
diff --git a/fs/cifs/sess.c b/fs/cifs/sess.c index 3af3b05b6c74..f1c3c6d9146c 100644 --- a/fs/cifs/sess.c +++ b/fs/cifs/sess.c @@ -1213,6 +1213,12 @@ out_free_smb_buf: static void sess_free_buffer(struct sess_data *sess_data) { + int i; + + /* zero the session data before freeing, as it might contain sensitive info (keys, etc) */ + for (i = 0; i < 3; i++) + if (sess_data->iov[i].iov_base) + memzero_explicit(sess_data->iov[i].iov_base, sess_data->iov[i].iov_len); free_rsp_buf(sess_data->buf0_type, sess_data->iov[0].iov_base); sess_data->buf0_type = CIFS_NO_BUFFER; @@ -1374,7 +1380,7 @@ out: sess_data->result = rc; sess_data->func = NULL; sess_free_buffer(sess_data); - kfree(ses->auth_key.response); + kfree_sensitive(ses->auth_key.response); ses->auth_key.response = NULL; } @@ -1513,7 +1519,7 @@ out: sess_data->result = rc; sess_data->func = NULL; sess_free_buffer(sess_data); - kfree(ses->auth_key.response); + kfree_sensitive(ses->auth_key.response); ses->auth_key.response = NULL; } @@ -1648,7 +1654,7 @@ sess_auth_rawntlmssp_negotiate(struct sess_data *sess_data) rc = decode_ntlmssp_challenge(bcc_ptr, blob_len, ses); out_free_ntlmsspblob: - kfree(ntlmsspblob); + kfree_sensitive(ntlmsspblob); out: sess_free_buffer(sess_data); @@ -1658,9 +1664,9 @@ out: } /* Else error. Cleanup */ - kfree(ses->auth_key.response); + kfree_sensitive(ses->auth_key.response); ses->auth_key.response = NULL; - kfree(ses->ntlmssp); + kfree_sensitive(ses->ntlmssp); ses->ntlmssp = NULL; sess_data->func = NULL; @@ -1759,7 +1765,7 @@ sess_auth_rawntlmssp_authenticate(struct sess_data *sess_data) } out_free_ntlmsspblob: - kfree(ntlmsspblob); + kfree_sensitive(ntlmsspblob); out: sess_free_buffer(sess_data); @@ -1767,9 +1773,9 @@ out: rc = sess_establish_session(sess_data); /* Cleanup */ - kfree(ses->auth_key.response); + kfree_sensitive(ses->auth_key.response); ses->auth_key.response = NULL; - kfree(ses->ntlmssp); + kfree_sensitive(ses->ntlmssp); ses->ntlmssp = NULL; sess_data->func = NULL; @@ -1845,7 +1851,7 @@ int CIFS_SessSetup(const unsigned int xid, struct cifs_ses *ses, rc = sess_data->result; out: - kfree(sess_data); + kfree_sensitive(sess_data); return rc; } #endif /* CONFIG_CIFS_ALLOW_INSECURE_LEGACY */ |