From dbb7caf110c4a7b9afb7cdc195ac6967d3a30adf Mon Sep 17 00:00:00 2001 From: Nishanth Menon Date: Tue, 12 Jun 2018 15:24:10 -0500 Subject: [PATCH] ARM: mach-omap2: omap5/dra7: Enable ACTLR[0] (Enable invalidates of BTB) to facilitate CVE_2017-5715 WA in OS Enable CVE_2017_5715 and since we have our own v7_arch_cp15_set_acr function to setup the bits, we are able to override the settings. Without this enabled, Linux kernel reports: CPU0: Spectre v2: firmware did not set auxiliary control register IBE bit, system vulnerable With this enabled, Linux kernel reports: CPU0: Spectre v2: using ICIALLU workaround NOTE: This by itself does not enable the workaround for CPU1 (on OMAP5 and DRA72/AM572 SoCs) and may require additional kernel patches. Signed-off-by: Nishanth Menon --- arch/arm/mach-omap2/Kconfig | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/arm/mach-omap2/Kconfig b/arch/arm/mach-omap2/Kconfig index 3bb1ecb58d..77820cc8d1 100644 --- a/arch/arm/mach-omap2/Kconfig +++ b/arch/arm/mach-omap2/Kconfig @@ -53,6 +53,7 @@ config OMAP54XX bool "OMAP54XX SoC" select ARM_ERRATA_798870 select SYS_THUMB_BUILD + select ARM_CORTEX_A15_CVE_2017_5715 imply NAND_OMAP_ELM imply NAND_OMAP_GPMC imply SPL_DISPLAY_PRINT -- 2.39.2