selftests/bpf: Test packet range of pointers sharing an idgrafted

Add tests where two packet pointers share an id and tightening one
pointer's umax from its var_off would put it less than their constant
distance from the other's umax: with an index & 0x38 capped at 50, the
base pointer keeps umax 50, so the pointer 8 bytes further on must keep
umax 58, even though its known bits allow at most 56.

These refused a valid program or accepted an out-of-bounds access before
the fix:

- check the advanced copy, load through the base: valid, was refused;
- check the base, load the byte at base + 1 through a copy advanced by
  8: was accepted;
- check base + 4, load 4 bytes at base + 2 through base + 8: reads two
  bytes past the checked range, was accepted;
- the same as the second with data_meta pointers checked against data:
  was accepted.

These pass with and without the fix and cover nearby paths:

- subtract an unknown scalar from a checked pointer and load below it
  (the range is kept across a new id);
- reach a load through two paths whose checks cover 8 and 7 bytes after
  the loaded pointer; the second path must not be pruned by the first;
- spill a copy of a pointer, check the pointer, fill the copy and load
  one byte past the checked range: the load is refused, and the copy
  has the range of the check.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20261001145255.855630-2-alexei.starovoitov@gmail.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

1 files changed, 33 insertions, 0 deletions

diff --git a/include/acpi/acpi.h b/include/acpi/acpi.h
new file mode 100644
index 000000000..07e3d6e21
--- /dev/null
+++ b/include/acpi/acpi.h
@@ -0,0 +1,33 @@
+/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 */
+/******************************************************************************
+ *
+ * Name: acpi.h - Master public include file used to interface to ACPICA
+ *
+ * Copyright (C) 2000 - 2026, Intel Corp.
+ *
+ *****************************************************************************/
+
+#ifndef __ACPI_H__
+#define __ACPI_H__
+
+/*
+ * Public include files for use by code that will interface to ACPICA.
+ *
+ * Information includes the ACPICA data types, names, exceptions, and
+ * external interface prototypes. Also included are the definitions for
+ * all ACPI tables (FADT, MADT, etc.)
+ *
+ * Note: The order of these include files is important.
+ */
+#include <acpi/platform/acenv.h>	/* Environment-specific items */
+#include <acpi/acnames.h>		/* Common ACPI names and strings */
+#include <acpi/actypes.h>		/* ACPICA data types and structures */
+#include <acpi/acexcep.h>		/* ACPICA exceptions */
+#include <acpi/actbl.h>		/* ACPI table definitions */
+#include <acpi/acrestyp.h>		/* Resource Descriptor structs */
+#include <acpi/platform/acenvex.h>	/* Extra environment-specific items */
+#include <acpi/acoutput.h>		/* Error output and Debug macros */
+#include <acpi/acpiosxf.h>		/* OSL interfaces (ACPICA-to-OS) */
+#include <acpi/acpixf.h>		/* ACPI core subsystem external interfaces */
+
+#endif				/* __ACPI_H__ */