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, 249 insertions, 0 deletions

diff --git a/net/mac80211/debug.h b/net/mac80211/debug.h
new file mode 100644
index 000000000..ef7c1a68d
--- /dev/null
+++ b/net/mac80211/debug.h
@@ -0,0 +1,249 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Portions
+ * Copyright (C) 2022 - 2025 Intel Corporation
+ */
+#ifndef __MAC80211_DEBUG_H
+#define __MAC80211_DEBUG_H
+#include <linux/once_lite.h>
+#include <net/cfg80211.h>
+
+#ifdef CONFIG_MAC80211_OCB_DEBUG
+#define MAC80211_OCB_DEBUG 1
+#else
+#define MAC80211_OCB_DEBUG 0
+#endif
+
+#ifdef CONFIG_MAC80211_IBSS_DEBUG
+#define MAC80211_IBSS_DEBUG 1
+#else
+#define MAC80211_IBSS_DEBUG 0
+#endif
+
+#ifdef CONFIG_MAC80211_PS_DEBUG
+#define MAC80211_PS_DEBUG 1
+#else
+#define MAC80211_PS_DEBUG 0
+#endif
+
+#ifdef CONFIG_MAC80211_HT_DEBUG
+#define MAC80211_HT_DEBUG 1
+#else
+#define MAC80211_HT_DEBUG 0
+#endif
+
+#ifdef CONFIG_MAC80211_MPL_DEBUG
+#define MAC80211_MPL_DEBUG 1
+#else
+#define MAC80211_MPL_DEBUG 0
+#endif
+
+#ifdef CONFIG_MAC80211_MPATH_DEBUG
+#define MAC80211_MPATH_DEBUG 1
+#else
+#define MAC80211_MPATH_DEBUG 0
+#endif
+
+#ifdef CONFIG_MAC80211_MHWMP_DEBUG
+#define MAC80211_MHWMP_DEBUG 1
+#else
+#define MAC80211_MHWMP_DEBUG 0
+#endif
+
+#ifdef CONFIG_MAC80211_MESH_SYNC_DEBUG
+#define MAC80211_MESH_SYNC_DEBUG 1
+#else
+#define MAC80211_MESH_SYNC_DEBUG 0
+#endif
+
+#ifdef CONFIG_MAC80211_MESH_CSA_DEBUG
+#define MAC80211_MESH_CSA_DEBUG 1
+#else
+#define MAC80211_MESH_CSA_DEBUG 0
+#endif
+
+#ifdef CONFIG_MAC80211_MESH_PS_DEBUG
+#define MAC80211_MESH_PS_DEBUG 1
+#else
+#define MAC80211_MESH_PS_DEBUG 0
+#endif
+
+#ifdef CONFIG_MAC80211_TDLS_DEBUG
+#define MAC80211_TDLS_DEBUG 1
+#else
+#define MAC80211_TDLS_DEBUG 0
+#endif
+
+#ifdef CONFIG_MAC80211_STA_DEBUG
+#define MAC80211_STA_DEBUG 1
+#else
+#define MAC80211_STA_DEBUG 0
+#endif
+
+#ifdef CONFIG_MAC80211_MLME_DEBUG
+#define MAC80211_MLME_DEBUG 1
+#else
+#define MAC80211_MLME_DEBUG 0
+#endif
+
+#ifdef CONFIG_MAC80211_MESSAGE_TRACING
+void __sdata_info(const char *fmt, ...) __printf(1, 2);
+void __sdata_dbg(bool print, const char *fmt, ...) __printf(2, 3);
+void __sdata_err(const char *fmt, ...) __printf(1, 2);
+void __wiphy_dbg(struct wiphy *wiphy, bool print, const char *fmt, ...)
+	__printf(3, 4);
+
+#define _sdata_info(sdata, fmt, ...)					\
+	__sdata_info("%s: " fmt, (sdata)->name, ##__VA_ARGS__)
+#define _sdata_dbg(print, sdata, fmt, ...)				\
+	__sdata_dbg(print, "%s: " fmt, (sdata)->name, ##__VA_ARGS__)
+#define _sdata_err(sdata, fmt, ...)					\
+	__sdata_err("%s: " fmt, (sdata)->name, ##__VA_ARGS__)
+#define _wiphy_dbg(print, wiphy, fmt, ...)				\
+	__wiphy_dbg(wiphy, print, fmt, ##__VA_ARGS__)
+#else
+#define _sdata_info(sdata, fmt, ...)					\
+do {									\
+	pr_info("%s: " fmt,						\
+		(sdata)->name, ##__VA_ARGS__);				\
+} while (0)
+
+#define _sdata_dbg(print, sdata, fmt, ...)				\
+do {									\
+	if (print)							\
+		pr_debug("%s: " fmt,					\
+			 (sdata)->name, ##__VA_ARGS__);			\
+} while (0)
+
+#define _sdata_err(sdata, fmt, ...)					\
+do {									\
+	pr_err("%s: " fmt,						\
+	       (sdata)->name, ##__VA_ARGS__);				\
+} while (0)
+
+#define _wiphy_dbg(print, wiphy, fmt, ...)				\
+do {									\
+	if (print)							\
+		wiphy_dbg((wiphy), fmt, ##__VA_ARGS__);			\
+} while (0)
+#endif
+
+#define sdata_info(sdata, fmt, ...)					\
+	_sdata_info(sdata, fmt, ##__VA_ARGS__)
+#define sdata_err(sdata, fmt, ...)					\
+	_sdata_err(sdata, fmt, ##__VA_ARGS__)
+#define sdata_dbg(sdata, fmt, ...)					\
+	_sdata_dbg(1, sdata, fmt, ##__VA_ARGS__)
+
+#define link_info(link, fmt, ...)					\
+	do {								\
+		if (ieee80211_vif_is_mld(&(link)->sdata->vif))          \
+			_sdata_info((link)->sdata, "[link %d] " fmt,	\
+				    (link)->link_id,			\
+				    ##__VA_ARGS__);			\
+		else							\
+			_sdata_info((link)->sdata, fmt, ##__VA_ARGS__);	\
+	} while (0)
+#define link_err(link, fmt, ...)					\
+	do {								\
+		if (ieee80211_vif_is_mld(&(link)->sdata->vif))          \
+			_sdata_err((link)->sdata, "[link %d] " fmt,	\
+				   (link)->link_id,			\
+				   ##__VA_ARGS__);			\
+		else							\
+			_sdata_err((link)->sdata, fmt, ##__VA_ARGS__);	\
+	} while (0)
+#define link_err_once(link, fmt, ...)					\
+	DO_ONCE_LITE(link_err, link, fmt, ##__VA_ARGS__)
+#define link_id_info(sdata, link_id, fmt, ...)				\
+	do {								\
+		if (ieee80211_vif_is_mld(&sdata->vif))			\
+			_sdata_info(sdata, "[link %d] " fmt, link_id,	\
+				    ##__VA_ARGS__);			\
+		else							\
+			_sdata_info(sdata, fmt, ##__VA_ARGS__);		\
+	} while (0)
+#define _link_id_dbg(print, sdata, link_id, fmt, ...)			\
+	do {								\
+		if (ieee80211_vif_is_mld(&(sdata)->vif))		\
+			_sdata_dbg(print, sdata, "[link %d] " fmt,	\
+				   link_id, ##__VA_ARGS__);		\
+		else							\
+			_sdata_dbg(print, sdata, fmt, ##__VA_ARGS__);	\
+	} while (0)
+#define link_dbg(link, fmt, ...)					\
+	_link_id_dbg(1, (link)->sdata, (link)->link_id,			\
+		     fmt, ##__VA_ARGS__)
+
+#define ht_dbg(sdata, fmt, ...)						\
+	_sdata_dbg(MAC80211_HT_DEBUG,					\
+		   sdata, fmt, ##__VA_ARGS__)
+
+#define ht_dbg_ratelimited(sdata, fmt, ...)				\
+	_sdata_dbg(MAC80211_HT_DEBUG && net_ratelimit(),		\
+		   sdata, fmt, ##__VA_ARGS__)
+
+#define ocb_dbg(sdata, fmt, ...)					\
+	_sdata_dbg(MAC80211_OCB_DEBUG,					\
+		   sdata, fmt, ##__VA_ARGS__)
+
+#define ibss_dbg(sdata, fmt, ...)					\
+	_sdata_dbg(MAC80211_IBSS_DEBUG,					\
+		   sdata, fmt, ##__VA_ARGS__)
+
+#define ps_dbg(sdata, fmt, ...)						\
+	_sdata_dbg(MAC80211_PS_DEBUG,					\
+		   sdata, fmt, ##__VA_ARGS__)
+
+#define ps_dbg_hw(hw, fmt, ...)						\
+	_wiphy_dbg(MAC80211_PS_DEBUG,					\
+		   (hw)->wiphy, fmt, ##__VA_ARGS__)
+
+#define ps_dbg_ratelimited(sdata, fmt, ...)				\
+	_sdata_dbg(MAC80211_PS_DEBUG && net_ratelimit(),		\
+		   sdata, fmt, ##__VA_ARGS__)
+
+#define mpl_dbg(sdata, fmt, ...)					\
+	_sdata_dbg(MAC80211_MPL_DEBUG,					\
+		   sdata, fmt, ##__VA_ARGS__)
+
+#define mpath_dbg(sdata, fmt, ...)					\
+	_sdata_dbg(MAC80211_MPATH_DEBUG,				\
+		   sdata, fmt, ##__VA_ARGS__)
+
+#define mhwmp_dbg(sdata, fmt, ...)					\
+	_sdata_dbg(MAC80211_MHWMP_DEBUG,				\
+		   sdata, fmt, ##__VA_ARGS__)
+
+#define msync_dbg(sdata, fmt, ...)					\
+	_sdata_dbg(MAC80211_MESH_SYNC_DEBUG,				\
+		   sdata, fmt, ##__VA_ARGS__)
+
+#define mcsa_dbg(sdata, fmt, ...)					\
+	_sdata_dbg(MAC80211_MESH_CSA_DEBUG,				\
+		   sdata, fmt, ##__VA_ARGS__)
+
+#define mps_dbg(sdata, fmt, ...)					\
+	_sdata_dbg(MAC80211_MESH_PS_DEBUG,				\
+		   sdata, fmt, ##__VA_ARGS__)
+
+#define tdls_dbg(sdata, fmt, ...)					\
+	_sdata_dbg(MAC80211_TDLS_DEBUG,					\
+		   sdata, fmt, ##__VA_ARGS__)
+
+#define sta_dbg(sdata, fmt, ...)					\
+	_sdata_dbg(MAC80211_STA_DEBUG,					\
+		   sdata, fmt, ##__VA_ARGS__)
+
+#define mlme_dbg(sdata, fmt, ...)					\
+	_sdata_dbg(MAC80211_MLME_DEBUG,					\
+		   sdata, fmt, ##__VA_ARGS__)
+#define mlme_link_id_dbg(sdata, link_id, fmt, ...)			\
+	_link_id_dbg(MAC80211_MLME_DEBUG, sdata, link_id,		\
+		     fmt, ##__VA_ARGS__)
+
+#define mlme_dbg_ratelimited(sdata, fmt, ...)				\
+	_sdata_dbg(MAC80211_MLME_DEBUG && net_ratelimit(),		\
+		   sdata, fmt, ##__VA_ARGS__)
+
+#endif /* __MAC80211_DEBUG_H */