diff options
-rw-r--r-- | Makefile | 3 | ||||
-rw-r--r-- | lib/ubsan.c | 20 |
2 files changed, 3 insertions, 20 deletions
@@ -619,6 +619,9 @@ KBUILD_CFLAGS += $(call cc-disable-warning, trampolines) KBUILD_CFLAGS += $(call cc-option, -fno-delete-null-pointer-checks,) +# disable invalid "can't wrap" optimizations for signed / pointers +KBUILD_CFLAGS += $(call cc-option,-fno-strict-overflow) + KBUILD_CFLAGS += $(call cc-disable-warning, address-of-packed-member) # Align the bit size of userspace programs with the kernel diff --git a/lib/ubsan.c b/lib/ubsan.c index 085d470cf7..648c7cc48a 100644 --- a/lib/ubsan.c +++ b/lib/ubsan.c @@ -382,26 +382,6 @@ void __ubsan_handle_shift_out_of_bounds(struct shift_out_of_bounds_data *data, if (suppress_report(&data->location)) return; - /* This handler would be called for code shifting a one into the - * sign bit like (1 << 31), which is all too common in barebox. - * It's technically UB, but it's so prevalent that it's highly - * unlikely to be treated by a compiler as anything else than the - * standard-compliant (1U << 31). Thus check for this case here - * and ignore it selectively - */ - if (type_is_signed(lhs_type)) { - s_max lhs_int, rhs_int; - - lhs_int = get_signed_val(lhs_type, lhs); - rhs_int = get_signed_val(rhs_type, rhs); - - if (fls(lhs_int) + rhs_int == type_bit_width(lhs_type)) { - pr_debug("signed left shift of %lld by %lld ignored.\n", - (s64)lhs_int, (s64)rhs_int); - return; - } - } - ubsan_prologue(&data->location, &flags); val_to_string(rhs_str, sizeof(rhs_str), rhs_type, rhs); |