Commit 55442958 authored by Mimi Zohar's avatar Mimi Zohar Committed by Ben Hutchings

KEYS: special dot prefixed keyring name bug fix

commit a4e3b8d7 upstream.

Dot prefixed keyring names are supposed to be reserved for the
kernel, but add_key() calls key_get_type_from_user(), which
incorrectly verifies the 'type' field, not the 'description' field.
This patch verifies the 'description' field isn't dot prefixed,
when creating a new keyring, and removes the dot prefix test in
key_get_type_from_user().

Changelog v6:
- whitespace and other cleanup

Changelog v5:
- Only prevent userspace from creating a dot prefixed keyring, not
  regular keys  - Dmitry
Reported-by: default avatarDmitry Kasatkin <d.kasatkin@samsung.com>
Signed-off-by: default avatarMimi Zohar <zohar@linux.vnet.ibm.com>
Acked-by: default avatarDavid Howells <dhowells@redhat.com>
Signed-off-by: default avatarBen Hutchings <ben@decadent.org.uk>
parent d2d603cf
......@@ -37,8 +37,6 @@ static int key_get_type_from_user(char *type,
return ret;
if (ret == 0 || ret >= len)
return -EINVAL;
if (type[0] == '.')
return -EPERM;
type[len - 1] = '\0';
return 0;
}
......@@ -86,6 +84,10 @@ SYSCALL_DEFINE5(add_key, const char __user *, _type,
if (!*description) {
kfree(description);
description = NULL;
} else if ((description[0] == '.') &&
(strncmp(type, "keyring", 7) == 0)) {
ret = -EPERM;
goto error2;
}
}
......
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