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KEYS: sanitize add_key() and keyctl() key payloads

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Before returning from add_key() or one of the keyctl() commands that
takes in a key payload, zero the temporary buffer that was allocated to
hold the key payload copied from userspace.  This may contain sensitive
key material that should not be kept around in the slab caches.

Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>
This commit is contained in:
Eric Biggers 2017-06-08 14:48:57 +01:00 committed by James Morris
parent 63a0b0509e
commit 57070c850a
1 changed files with 9 additions and 3 deletions
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12
security/keys/keyctl.c
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@ -132,7 +132,10 @@ SYSCALL_DEFINE5(add_key, const char __user *, _type,
key_ref_put(keyring_ref);
error3:
kvfree(payload);
if (payload) {
memzero_explicit(payload, plen);
kvfree(payload);
}
error2:
kfree(description);
error:
@ -347,7 +350,7 @@ long keyctl_update_key(key_serial_t id,
key_ref_put(key_ref);
error2:
kfree(payload);
kzfree(payload);
error:
return ret;
}
@ -1093,7 +1096,10 @@ long keyctl_instantiate_key_common(key_serial_t id,
keyctl_change_reqkey_auth(NULL);
error2:
kvfree(payload);
if (payload) {
memzero_explicit(payload, plen);
kvfree(payload);
}
error:
return ret;
}