kevin/linux
1
Fork 0
Code

x86/bugs: Add a separate config for TAA

Browse Source 
Currently, the CONFIG_SPECULATION_MITIGATIONS is halfway populated,
where some mitigations have entries in Kconfig, and they could be
modified, while others mitigations do not have Kconfig entries, and
could not be controlled at build time.

Create an entry for the TAA CPU mitigation under
CONFIG_SPECULATION_MITIGATIONS. This allow users to enable or disable
it at compilation time.

Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Acked-by: Josh Poimboeuf <jpoimboe@kernel.org>
Link: https://lore.kernel.org/r/20240729164105.554296-3-leitao@debian.org
This commit is contained in:
Breno Leitao 2024-07-29 09:40:50 -07:00 committed by Borislav Petkov (AMD)
parent 940455681d
commit b8da0b33d3
2 changed files with 13 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
arch/x86/Kconfig
View File

@ -2659,6 +2659,17 @@ config MITIGATION_MDS
a hardware vulnerability which allows unprivileged speculative access a hardware vulnerability which allows unprivileged speculative access
to data which is available in various CPU internal buffers. to data which is available in various CPU internal buffers.
See also <file:Documentation/admin-guide/hw-vuln/mds.rst> See also <file:Documentation/admin-guide/hw-vuln/mds.rst>
config MITIGATION_TAA
bool "Mitigate TSX Asynchronous Abort (TAA) hardware bug"
depends on CPU_SUP_INTEL
default y
help
Enable mitigation for TSX Asynchronous Abort (TAA). TAA is a hardware
vulnerability that allows unprivileged speculative access to data
which is available in various CPU internal buffers by using
asynchronous aborts within an Intel TSX transactional region.
See also <file:Documentation/admin-guide/hw-vuln/tsx_async_abort.rst>
endif endif
config ARCH_HAS_ADD_PAGES config ARCH_HAS_ADD_PAGES

3
arch/x86/kernel/cpu/bugs.c
View File

@ -294,7 +294,8 @@ enum taa_mitigations {
}; };
/* Default mitigation for TAA-affected CPUs */ /* Default mitigation for TAA-affected CPUs */
static enum taa_mitigations taa_mitigation __ro_after_init = TAA_MITIGATION_VERW; static enum taa_mitigations taa_mitigation __ro_after_init =
IS_ENABLED(CONFIG_MITIGATION_TAA) ? TAA_MITIGATION_VERW : TAA_MITIGATION_OFF;
static bool taa_nosmt __ro_after_init; static bool taa_nosmt __ro_after_init;
static const char * const taa_strings[] = { static const char * const taa_strings[] = {