This adds support for kcov to UML.
There is a small problem where UML will randomly segfault during boot;
this is because current_thread_info() occasionally returns an invalid
(non-NULL) pointer and we try to dereference it in
__sanitizer_cov_trace_pc(). I consider this a bug in UML itself and this
patch merely exposes it.
Cc: Quentin Casasnovas <quentin.casasno...@oracle.com>
Cc: Richard Weinberger <rich...@nod.at>
Cc: Thomas Meyer <tho...@m3y3r.de>
Cc: user-mode-linux-devel <user-mode-linux-devel@lists.sourceforge.net>
Cc: Dmitry Vyukov <dvyu...@google.com>
Signed-off-by: Vegard Nossum <vegard.nos...@oracle.com>
---
arch/um/Kconfig.common | 1 +
arch/x86/um/vdso/Makefile | 3 +++
2 files changed, 4 insertions(+)
diff --git a/arch/um/Kconfig.common b/arch/um/Kconfig.common
index cc00134..64c1d46 100644
--- a/arch/um/Kconfig.common
+++ b/arch/um/Kconfig.common
@@ -1,6 +1,7 @@
config UML
bool
default y
+ select ARCH_HAS_KCOV
select HAVE_ARCH_AUDITSYSCALL
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_UID16
diff --git a/arch/x86/um/vdso/Makefile b/arch/x86/um/vdso/Makefile
index 6c803ca..d72dec4 100644
--- a/arch/x86/um/vdso/Makefile
+++ b/arch/x86/um/vdso/Makefile
@@ -2,6 +2,9 @@
# Building vDSO images for x86.
#
+# Prevents link failures: __sanitizer_cov_trace_pc() is not linked in.
+KCOV_INSTRUMENT := n
+
VDSO64-y := y
vdso-install-$(VDSO64-y) += vdso.so
--
1.9.1
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