Update Linux to v5.4.2
Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/security/keys/Kconfig b/security/keys/Kconfig
index 6462e66..dd31343 100644
--- a/security/keys/Kconfig
+++ b/security/keys/Kconfig
@@ -1,3 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0-only
#
# Key management configuration
#
@@ -24,6 +25,24 @@
def_bool y
depends on COMPAT && KEYS
+config KEYS_REQUEST_CACHE
+ bool "Enable temporary caching of the last request_key() result"
+ depends on KEYS
+ help
+ This option causes the result of the last successful request_key()
+ call that didn't upcall to the kernel to be cached temporarily in the
+ task_struct. The cache is cleared by exit and just prior to the
+ resumption of userspace.
+
+ This allows the key used for multiple step processes where each step
+ wants to request a key that is likely the same as the one requested
+ by the last step to save on the searching.
+
+ An example of such a process is a pathwalk through a network
+ filesystem in which each method needs to request an authentication
+ key. Pathwalk will call multiple methods for each dentry traversed
+ (permission, d_revalidate, lookup, getxattr, getacl, ...).
+
config PERSISTENT_KEYRINGS
bool "Enable register of persistent per-UID keyrings"
depends on KEYS