From: Tobias Klauser <[email protected]> commit f3d60f2a25e4417e1676161fe42115de3e3f98a2 upstream.
We use the generic C VDSO implementations of a handful of clock-related functions. When kasan is enabled this results in asan stub calls that are unlikely to be resolved by userspace, this just disables KASAN when building the VDSO. Verified the fix on a kernel with KASAN enabled using vDSO selftests. Link: https://lore.kernel.org/lkml/CACT4Y+ZNJBnkKHXUf=tm_yuowvZvHwN=0rmJ=7j+xfd+9r_...@mail.gmail.com/ Tested-by: Tobias Klauser <[email protected]> Signed-off-by: Tobias Klauser <[email protected]> Tested-by: Dmitry Vyukov <[email protected]> [Palmer: commit text] Fixes: ad5d1122b82f ("riscv: use vDSO common flow to reduce the latency of the time-related functions") Cc: [email protected] Signed-off-by: Palmer Dabbelt <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- arch/riscv/kernel/vdso/Makefile | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/arch/riscv/kernel/vdso/Makefile +++ b/arch/riscv/kernel/vdso/Makefile @@ -32,9 +32,10 @@ CPPFLAGS_vdso.lds += -P -C -U$(ARCH) # Disable -pg to prevent insert call site CFLAGS_REMOVE_vgettimeofday.o = $(CC_FLAGS_FTRACE) -Os -# Disable gcov profiling for VDSO code +# Disable profiling and instrumentation for VDSO code GCOV_PROFILE := n KCOV_INSTRUMENT := n +KASAN_SANITIZE := n # Force dependency $(obj)/vdso.o: $(obj)/vdso.so
