The patch titled
Subject: kasan: remove mentions of unsupported Clang versions
has been added to the -mm tree. Its filename is
kasan-remove-mentions-of-unsupported-clang-versions.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/kasan-remove-mentions-of-unsupported-clang-versions.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/kasan-remove-mentions-of-unsupported-clang-versions.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
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------------------------------------------------------
From: Marco Elver <elver@xxxxxxxxxx>
Subject: kasan: remove mentions of unsupported Clang versions
Since the kernel now requires at least Clang 10.0.1, remove any mention of
old Clang versions and simplify the documentation.
Link: https://lkml.kernel.org/r/20200902225911.209899-7-ndesaulniers@xxxxxxxxxx
Signed-off-by: Marco Elver <elver@xxxxxxxxxx>
Signed-off-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
Reviewed-by: Andrey Konovalov <andreyknvl@xxxxxxxxxx>
Reviewed-by: Kees Cook <keescook@xxxxxxxxxxxx>
Reviewed-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
Cc: Fangrui Song <maskray@xxxxxxxxxx>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@xxxxxxxxx>
Cc: Sedat Dilek <sedat.dilek@xxxxxxxxx>
Cc: Alexei Starovoitov <ast@xxxxxxxxxx>
Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
Cc: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Cc: Vincenzo Frascino <vincenzo.frascino@xxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/dev-tools/kasan.rst | 4 ++--
lib/Kconfig.kasan | 9 ++++-----
2 files changed, 6 insertions(+), 7 deletions(-)
--- a/Documentation/dev-tools/kasan.rst~kasan-remove-mentions-of-unsupported-clang-versions
+++ a/Documentation/dev-tools/kasan.rst
@@ -13,10 +13,10 @@ KASAN uses compile-time instrumentation
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.
--- a/lib/Kconfig.kasan~kasan-remove-mentions-of-unsupported-clang-versions
+++ a/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.
_
Patches currently in -mm which might be from elver@xxxxxxxxxx are
kasan-remove-mentions-of-unsupported-clang-versions.patch
