lkml.org 
[lkml]   [2020]   [Sep]   [2]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
Subject[PATCH v3 6/7] kasan: Remove mentions of unsupported Clang versions
From
From: Marco Elver <elver@google.com>

Since the kernel now requires at least Clang 10.0.1, remove any mention
of old Clang versions and simplify the documentation.

Signed-off-by: Marco Elver <elver@google.com>
Signed-off-by: Nick Desaulniers <ndesaulniers@google.com>
Reviewed-by: Andrey Konovalov <andreyknvl@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
---
Documentation/dev-tools/kasan.rst | 4 ++--
lib/Kconfig.kasan | 9 ++++-----
2 files changed, 6 insertions(+), 7 deletions(-)

diff --git a/Documentation/dev-tools/kasan.rst b/Documentation/dev-tools/kasan.rst
index 38fd5681fade..4abc84b1798c 100644
--- a/Documentation/dev-tools/kasan.rst
+++ b/Documentation/dev-tools/kasan.rst
@@ -13,10 +13,10 @@ KASAN uses compile-time instrumentation to insert validity checks before every
memory access, and therefore requires a compiler version that supports that.

Generic KASAN is supported in both GCC and Clang. With GCC it requires version
-8.3.0 or later. With Clang it requires version 7.0.0 or later, but detection of
+8.3.0 or later. Any supported Clang version is compatible, but detection of
out-of-bounds accesses for global variables is only supported since Clang 11.

-Tag-based KASAN is only supported in Clang and requires version 7.0.0 or later.
+Tag-based KASAN is only supported in Clang.

Currently generic KASAN is supported for the x86_64, arm64, xtensa, s390 and
riscv architectures, and tag-based KASAN is supported only for arm64.
diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
index 047b53dbfd58..033a5bc67ac4 100644
--- a/lib/Kconfig.kasan
+++ b/lib/Kconfig.kasan
@@ -54,9 +54,9 @@ config KASAN_GENERIC
Enables generic KASAN mode.

This mode is supported in both GCC and Clang. With GCC it requires
- version 8.3.0 or later. With Clang it requires version 7.0.0 or
- later, but detection of out-of-bounds accesses for global variables
- is supported only since Clang 11.
+ version 8.3.0 or later. Any supported Clang version is compatible,
+ but detection of out-of-bounds accesses for global variables is
+ supported only since Clang 11.

This mode consumes about 1/8th of available memory at kernel start
and introduces an overhead of ~x1.5 for the rest of the allocations.
@@ -78,8 +78,7 @@ config KASAN_SW_TAGS
Enables software tag-based KASAN mode.

This mode requires Top Byte Ignore support by the CPU and therefore
- is only supported for arm64. This mode requires Clang version 7.0.0
- or later.
+ is only supported for arm64. This mode requires Clang.

This mode consumes about 1/16th of available memory at kernel start
and introduces an overhead of ~20% for the rest of the allocations.
--
2.28.0.402.g5ffc5be6b7-goog
\
 
 \ /
  Last update: 2020-09-03 01:00    [W:0.061 / U:0.856 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site