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, 29 insertions, 0 deletions

diff --git a/rust/exports.c b/rust/exports.c
new file mode 100644
index 000000000..1b52460b0
--- /dev/null
+++ b/rust/exports.c
@@ -0,0 +1,29 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * A hack to export Rust symbols for loadable modules without having to redo
+ * the entire `include/linux/export.h` logic in Rust.
+ *
+ * This requires Rust's new/future `v0` mangling scheme because the default one
+ * ("legacy") uses invalid characters for C identifiers (thus we cannot use the
+ * `EXPORT_SYMBOL_*` macros).
+ *
+ * All symbols are exported as GPL-only to guarantee no GPL-only feature is
+ * accidentally exposed.
+ */
+
+#include <linux/export.h>
+
+#define EXPORT_SYMBOL_RUST_GPL(sym) extern int sym; EXPORT_SYMBOL_GPL(sym)
+
+#include "exports_core_generated.h"
+#include "exports_bindings_generated.h"
+#include "exports_kernel_generated.h"
+
+#ifndef CONFIG_RUST_INLINE_HELPERS
+#include "exports_helpers_generated.h"
+#endif
+
+// For modules using `rust/build_error.rs`.
+#ifdef CONFIG_RUST_BUILD_ASSERT_ALLOW
+EXPORT_SYMBOL_RUST_GPL(rust_build_error);
+#endif