KEYS: Make the system trusted keyring depend on the asymmetric key type

Make the system trusted keyring depend on the asymmetric key type as
there's not a lot of point having it if you can't then load asymmetric keys
onto it.

This requires the ASYMMETRIC_KEY_TYPE to be made a bool, not a tristate, as
the Kconfig language doesn't then correctly force ASYMMETRIC_KEY_TYPE to
'y' rather than 'm' if SYSTEM_TRUSTED_KEYRING is 'y'.

Making SYSTEM_TRUSTED_KEYRING *select* ASYMMETRIC_KEY_TYPE instead doesn't
work as the Kconfig interpreter then wrongly complains about dependency
loops.

Signed-off-by: David Howells <dhowells@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/certs/Kconfig b/certs/Kconfig
index f0f8a4433685..743d480f5f6f 100644
--- a/certs/Kconfig
+++ b/certs/Kconfig
@@ -17,6 +17,7 @@ config MODULE_SIG_KEY
 config SYSTEM_TRUSTED_KEYRING
         bool "Provide system-wide ring of trusted keys"
         depends on KEYS
+        depends on ASYMMETRIC_KEY_TYPE
         help
           Provide a system keyring to which trusted keys can be added.  Keys in
           the keyring are considered to be trusted.  Keys may be added at will