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, 28 insertions, 0 deletions

diff --git a/rust/helpers/xarray.c b/rust/helpers/xarray.c
new file mode 100644
index 000000000..08979b304
--- /dev/null
+++ b/rust/helpers/xarray.c
@@ -0,0 +1,28 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/xarray.h>
+
+__rust_helper int rust_helper_xa_err(void *entry)
+{
+	return xa_err(entry);
+}
+
+__rust_helper void rust_helper_xa_init_flags(struct xarray *xa, gfp_t flags)
+{
+	return xa_init_flags(xa, flags);
+}
+
+__rust_helper int rust_helper_xa_trylock(struct xarray *xa)
+{
+	return xa_trylock(xa);
+}
+
+__rust_helper void rust_helper_xa_lock(struct xarray *xa)
+{
+	return xa_lock(xa);
+}
+
+__rust_helper void rust_helper_xa_unlock(struct xarray *xa)
+{
+	return xa_unlock(xa);
+}