path: root/arch/s390/lib
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authorVasily Gorbik <gor@linux.ibm.com>2017-11-17 17:20:28 +0100
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2018-10-09 11:21:21 +0200
commitb6cbe3e8bdff6f21f1b58b08a55f479cdcf98282 (patch)
treecb4e8efaf03c4f7ca8a90f0a1435ac64cfe0d2ab /arch/s390/lib
parent7fef92ccadd744492526d7749eebfe24dd8dcc48 (diff)
s390/kasan: avoid user access code instrumentation
Kasan instrumentation adds "store" check for variables marked as modified by inline assembly. With user pointers containing addresses from another address space this produces false positives. static inline unsigned long clear_user_xc(void __user *to, ...) { asm volatile( ... : "+a" (to) ... User space access functions are wrapped by manually instrumented functions in kasan common code, which should be sufficient to catch errors. So, we just disable uaccess.o instrumentation altogether. Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/lib')
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/s390/lib/Makefile b/arch/s390/lib/Makefile
index 57ab40188d4b..5418d10dc2a8 100644
--- a/arch/s390/lib/Makefile
+++ b/arch/s390/lib/Makefile
@@ -9,5 +9,9 @@ lib-$(CONFIG_SMP) += spinlock.o
lib-$(CONFIG_KPROBES) += probes.o
lib-$(CONFIG_UPROBES) += probes.o
+# Instrumenting memory accesses to __user data (in different address space)
+# produce false positives
+KASAN_SANITIZE_uaccess.o := n
chkbss := mem.o
include $(srctree)/arch/s390/scripts/Makefile.chkbss

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