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x86/bugs: Correct RSB terminology in Kconfig

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RSB stands for "Return Stack Buffer" in industry literature[1]. Update
the kernel Kconfig to use this standard term instead of the current
"Return-Speculation-Buffer".

This change aligns kernel documentation with widely accepted terminology.

The line length reduction triggers text reformatting, but no functional
text is altered.

[1] https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/advisory-guidance/return-stack-buffer-underflow.html

Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Dave Hansen <dave.hansen@linux.intel.com>
Link: https://lore.kernel.org/all/20240913122754.249306-1-leitao%40debian.org
This commit is contained in:
Breno Leitao 2024-09-13 05:27:53 -07:00 committed by Dave Hansen
parent 9852d85ec9
commit 86e39b94cd
1 changed files with 8 additions and 9 deletions
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17
arch/x86/Kconfig
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@ -2551,15 +2551,14 @@ config MITIGATION_CALL_DEPTH_TRACKING
default y
help
Compile the kernel with call depth tracking to mitigate the Intel
SKL Return-Speculation-Buffer (RSB) underflow issue. The
mitigation is off by default and needs to be enabled on the
kernel command line via the retbleed=stuff option. For
non-affected systems the overhead of this option is marginal as
the call depth tracking is using run-time generated call thunks
in a compiler generated padding area and call patching. This
increases text size by ~5%. For non affected systems this space
is unused. On affected SKL systems this results in a significant
performance gain over the IBRS mitigation.
SKL Return-Stack-Buffer (RSB) underflow issue. The mitigation is off
by default and needs to be enabled on the kernel command line via the
retbleed=stuff option. For non-affected systems the overhead of this
option is marginal as the call depth tracking is using run-time
generated call thunks in a compiler generated padding area and call
patching. This increases text size by ~5%. For non affected systems
this space is unused. On affected SKL systems this results in a
significant performance gain over the IBRS mitigation.
config CALL_THUNKS_DEBUG
bool "Enable call thunks and call depth tracking debugging"