From: Adrian Hunter <adrian.hunter@intel.com>
Date: Mon, 25 Mar 2024 06:40:07 +0000 (+0200)
Subject: vdso: Add CONFIG_GENERIC_VDSO_OVERFLOW_PROTECT
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=0c68458b0a5878d735572b4f4d91219a1db7c784;p=linux.git

vdso: Add CONFIG_GENERIC_VDSO_OVERFLOW_PROTECT

Add CONFIG_GENERIC_VDSO_OVERFLOW_PROTECT in preparation to add
multiplication overflow protection to the VDSO time getter functions.

Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240325064023.2997-4-adrian.hunter@intel.com
---

diff --git a/lib/vdso/Kconfig b/lib/vdso/Kconfig
index d883ac2995089..c46c2300517c9 100644
--- a/lib/vdso/Kconfig
+++ b/lib/vdso/Kconfig
@@ -30,4 +30,11 @@ config GENERIC_VDSO_TIME_NS
 	  Selected by architectures which support time namespaces in the
 	  VDSO
 
+config GENERIC_VDSO_OVERFLOW_PROTECT
+	bool
+	help
+	  Select to add multiplication overflow protection to the VDSO
+	  time getter functions for the price of an extra conditional
+	  in the hotpath.
+
 endif