selftests/bpf: Check that JMP32 pointer vs zero jumps are not predictedgrafted

Add jmp32_ptr_vs_zero_jne: the fall-through of the 32-bit compare, which
the verifier used to skip, contains an out of bounds map value access,
hence w/o the previous patch the program is accepted. See previous patch
for detailed description.

Reported-by: Nicholas Carlini <npc@anthropic.com>
Suggested-by: Nicholas Carlini <npc@anthropic.com>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/bpf/20260904083325.2083493-6-eddyz87@gmail.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

1 files changed, 31 insertions, 0 deletions

diff --git a/tools/include/nolibc/math.h b/tools/include/nolibc/math.h
new file mode 100644
index 000000000..9df823ddd
--- /dev/null
+++ b/tools/include/nolibc/math.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: LGPL-2.1 OR MIT */
+/*
+ * math definitions for NOLIBC
+ * Copyright (C) 2025 Thomas Weißschuh <thomas.weissschuh@linutronix.de>
+ */
+
+/* make sure to include all global symbols */
+#include "nolibc.h"
+
+#ifndef _NOLIBC_SYS_MATH_H
+#define _NOLIBC_SYS_MATH_H
+
+static __inline__
+double fabs(double x)
+{
+	return x >= 0 ? x : -x;
+}
+
+static __inline__
+float fabsf(float x)
+{
+	return x >= 0 ? x : -x;
+}
+
+static __inline__
+long double fabsl(long double x)
+{
+	return x >= 0 ? x : -x;
+}
+
+#endif /* _NOLIBC_SYS_MATH_H */