[RFC PATCH] audit: make ADUITSYSCALL optional again

[Frederick Lawler <fred@cloudflare.com>]

Since the introduction of commit cb74ed278f80 ("audit: always enable
syscall auditing when supported and audit is enabled"), eBPF
technologies are being adopted to track syscalls for auditing purposes.
Those technologies add an additional overhead ontop of AUDITSYSCALL.
Additionally, AUDIT infrastructure has expanded to include INTEGRITY which
offers some advantages over eBPF technologies, such as early-init/boot
integrity logs with. Therefore, make ADUITSYSCALL optional
again, but keep it default y.

Signed-off-by: Frederick Lawler <fred@cloudflare.com>
---
 init/Kconfig | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/init/Kconfig b/init/Kconfig
index af4c2f085455..2552918deb45 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -487,16 +487,21 @@ config AUDIT
 	help
 	  Enable auditing infrastructure that can be used with another
 	  kernel subsystem, such as SELinux (which requires this for
-	  logging of avc messages output).  System call auditing is included
-	  on architectures which support it.
+	  logging of avc messages output). Does not do system-call
+	  auditing without CONFIG_AUDITSYSCALL.
 
 config HAVE_ARCH_AUDITSYSCALL
 	bool
 
 config AUDITSYSCALL
-	def_bool y
+	bool "Enable system-call auditing support"
 	depends on AUDIT && HAVE_ARCH_AUDITSYSCALL
+	default y
 	select FSNOTIFY
+	help
+	  Enable low-overhead system-call auditing infrastructure that
+	  can be used indepdently or with another kernel subsystem,
+	  such as SELiux.
 
 source "kernel/irq/Kconfig"
 source "kernel/time/Kconfig"
-- 
2.43.0