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authorDavid S. Miller <davem@davemloft.net>2019-03-05 00:26:15 +0300
committerDavid S. Miller <davem@davemloft.net>2019-03-05 00:26:15 +0300
commit18a4d8bf250a33c015955f0dec27259780ef6448 (patch)
tree3e380812ac047fef70c0da52ba74705ee62b7130 /lib
parent096461de96a94c856190ba892ebf62dfba5a38f1 (diff)
parent822e44b45eb991c63487c5e2ce7d636411870a8d (diff)
downloadlinux-18a4d8bf250a33c015955f0dec27259780ef6448.tar.xz
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.kasan22
1 files changed, 22 insertions, 0 deletions
diff --git a/lib/Kconfig.kasan b/lib/Kconfig.kasan
index d8c474b6691e..9737059ec58b 100644
--- a/lib/Kconfig.kasan
+++ b/lib/Kconfig.kasan
@@ -113,6 +113,28 @@ config KASAN_INLINE
endchoice
+config KASAN_STACK_ENABLE
+ bool "Enable stack instrumentation (unsafe)" if CC_IS_CLANG && !COMPILE_TEST
+ default !(CLANG_VERSION < 90000)
+ depends on KASAN
+ help
+ The LLVM stack address sanitizer has a know problem that
+ causes excessive stack usage in a lot of functions, see
+ https://bugs.llvm.org/show_bug.cgi?id=38809
+ Disabling asan-stack makes it safe to run kernels build
+ with clang-8 with KASAN enabled, though it loses some of
+ the functionality.
+ This feature is always disabled when compile-testing with clang-8
+ or earlier to avoid cluttering the output in stack overflow
+ warnings, but clang-8 users can still enable it for builds without
+ CONFIG_COMPILE_TEST. On gcc and later clang versions it is
+ assumed to always be safe to use and enabled by default.
+
+config KASAN_STACK
+ int
+ default 1 if KASAN_STACK_ENABLE || CC_IS_GCC
+ default 0
+
config KASAN_S390_4_LEVEL_PAGING
bool "KASan: use 4-level paging"
depends on KASAN && S390