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, 32 insertions, 0 deletions

diff --git a/include/dt-bindings/phy/phy.h b/include/dt-bindings/phy/phy.h
new file mode 100644
index 000000000..979b5dfd8
--- /dev/null
+++ b/include/dt-bindings/phy/phy.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ *
+ * This header provides constants for the phy framework
+ *
+ * Copyright (C) 2014 STMicroelectronics
+ * Author: Gabriel Fernandez <gabriel.fernandez@st.com>
+ */
+
+#ifndef _DT_BINDINGS_PHY
+#define _DT_BINDINGS_PHY
+
+#define PHY_NONE		0
+#define PHY_TYPE_SATA		1
+#define PHY_TYPE_PCIE		2
+#define PHY_TYPE_USB2		3
+#define PHY_TYPE_USB3		4
+#define PHY_TYPE_UFS		5
+#define PHY_TYPE_DP		6
+#define PHY_TYPE_XPCS		7
+#define PHY_TYPE_SGMII		8
+#define PHY_TYPE_QSGMII		9
+#define PHY_TYPE_DPHY		10
+#define PHY_TYPE_CPHY		11
+#define PHY_TYPE_USXGMII	12
+#define PHY_TYPE_XAUI		13
+
+#define PHY_POL_NORMAL		0
+#define PHY_POL_INVERT		1
+#define PHY_POL_AUTO		2
+
+#endif /* _DT_BINDINGS_PHY */