On Mon, Aug 31, 2020 at 05:23:25PM -0700, Nick Desaulniers wrote: > From: Marco Elver <el...@google.com> > > Since the kernel now requires at least Clang 10.0.1, remove any mention > of old Clang versions and simplify the documentation. > > Reviewed-by: Andrey Konovalov <andreyk...@google.com> > Signed-off-by: Marco Elver <el...@google.com> > Signed-off-by: Nick Desaulniers <ndesaulni...@google.com>
Reviewed-by: Nathan Chancellor <natechancel...@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 >
