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, 237 insertions, 0 deletions

diff --git a/include/soc/tegra/bpmp.h b/include/soc/tegra/bpmp.h
new file mode 100644
index 000000000..a33582590
--- /dev/null
+++ b/include/soc/tegra/bpmp.h
@@ -0,0 +1,237 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.
+ */
+
+#ifndef __SOC_TEGRA_BPMP_H
+#define __SOC_TEGRA_BPMP_H
+
+#include <linux/iosys-map.h>
+#include <linux/mailbox_client.h>
+#include <linux/pm_domain.h>
+#include <linux/reset-controller.h>
+#include <linux/semaphore.h>
+#include <linux/types.h>
+
+#include <soc/tegra/bpmp-abi.h>
+
+struct tegra_bpmp_clk;
+struct tegra_bpmp_ops;
+
+struct tegra_bpmp_soc {
+	struct {
+		struct {
+			unsigned int offset;
+			unsigned int count;
+			unsigned int timeout;
+		} cpu_tx, thread, cpu_rx;
+	} channels;
+
+	const struct tegra_bpmp_ops *ops;
+	unsigned int num_resets;
+};
+
+struct tegra_bpmp_mb_data {
+	u32 code;
+	u32 flags;
+	u8 data[MSG_DATA_MIN_SZ];
+} __packed;
+
+#define tegra_bpmp_mb_read(dst, mb, size) \
+	iosys_map_memcpy_from(dst, mb, offsetof(struct tegra_bpmp_mb_data, data), size)
+
+#define tegra_bpmp_mb_write(mb, src, size) \
+	iosys_map_memcpy_to(mb, offsetof(struct tegra_bpmp_mb_data, data), src, size)
+
+#define tegra_bpmp_mb_read_field(mb, field) \
+	iosys_map_rd_field(mb, 0, struct tegra_bpmp_mb_data, field)
+
+#define tegra_bpmp_mb_write_field(mb, field, value) \
+	iosys_map_wr_field(mb, 0, struct tegra_bpmp_mb_data, field, value)
+
+struct tegra_bpmp_channel {
+	struct tegra_bpmp *bpmp;
+	struct iosys_map ib;
+	struct iosys_map ob;
+	struct completion completion;
+	struct tegra_ivc *ivc;
+	unsigned int index;
+};
+
+typedef void (*tegra_bpmp_mrq_handler_t)(unsigned int mrq,
+					 struct tegra_bpmp_channel *channel,
+					 void *data);
+
+struct tegra_bpmp_mrq {
+	struct list_head list;
+	unsigned int mrq;
+	tegra_bpmp_mrq_handler_t handler;
+	void *data;
+};
+
+struct tegra_bpmp {
+	const struct tegra_bpmp_soc *soc;
+	struct device *dev;
+	void *priv;
+
+	struct {
+		struct mbox_client client;
+		struct mbox_chan *channel;
+	} mbox;
+
+	spinlock_t atomic_tx_lock;
+	struct tegra_bpmp_channel *tx_channel, *rx_channel, *threaded_channels;
+
+	struct {
+		unsigned long *allocated;
+		unsigned long *busy;
+		unsigned int count;
+		struct semaphore lock;
+	} threaded;
+
+	struct list_head mrqs;
+	spinlock_t lock;
+
+	struct tegra_bpmp_clk **clocks;
+	unsigned int num_clocks;
+
+	struct reset_controller_dev rstc;
+
+	struct genpd_onecell_data genpd;
+
+#ifdef CONFIG_DEBUG_FS
+	struct dentry *debugfs_mirror;
+#endif
+
+	bool suspended;
+};
+
+#define TEGRA_BPMP_MESSAGE_RESET BIT(0)
+
+struct tegra_bpmp_message {
+	unsigned int mrq;
+
+	struct {
+		const void *data;
+		size_t size;
+	} tx;
+
+	struct {
+		void *data;
+		size_t size;
+		int ret;
+	} rx;
+
+	unsigned long flags;
+};
+
+#if IS_ENABLED(CONFIG_TEGRA_BPMP)
+struct tegra_bpmp *tegra_bpmp_get(struct device *dev);
+struct tegra_bpmp *tegra_bpmp_get_with_id(struct device *dev, unsigned int *id);
+void tegra_bpmp_put(struct tegra_bpmp *bpmp);
+int tegra_bpmp_transfer_atomic(struct tegra_bpmp *bpmp,
+			       struct tegra_bpmp_message *msg);
+int tegra_bpmp_transfer(struct tegra_bpmp *bpmp,
+			struct tegra_bpmp_message *msg);
+void tegra_bpmp_mrq_return(struct tegra_bpmp_channel *channel, int code,
+			   const void *data, size_t size);
+
+int tegra_bpmp_request_mrq(struct tegra_bpmp *bpmp, unsigned int mrq,
+			   tegra_bpmp_mrq_handler_t handler, void *data);
+void tegra_bpmp_free_mrq(struct tegra_bpmp *bpmp, unsigned int mrq,
+			 void *data);
+bool tegra_bpmp_mrq_is_supported(struct tegra_bpmp *bpmp, unsigned int mrq);
+#else
+static inline struct tegra_bpmp *tegra_bpmp_get(struct device *dev)
+{
+	return ERR_PTR(-ENODEV);
+}
+
+static inline struct tegra_bpmp *tegra_bpmp_get_with_id(struct device *dev,
+							unsigned int *id)
+{
+	return ERR_PTR(-ENODEV);
+}
+
+static inline void tegra_bpmp_put(struct tegra_bpmp *bpmp)
+{
+}
+
+static inline int tegra_bpmp_transfer_atomic(struct tegra_bpmp *bpmp,
+					     struct tegra_bpmp_message *msg)
+{
+	return -ENODEV;
+}
+
+static inline int tegra_bpmp_transfer(struct tegra_bpmp *bpmp,
+				      struct tegra_bpmp_message *msg)
+{
+	return -ENODEV;
+}
+
+static inline void tegra_bpmp_mrq_return(struct tegra_bpmp_channel *channel,
+					 int code, const void *data,
+					 size_t size)
+{
+}
+
+static inline int tegra_bpmp_request_mrq(struct tegra_bpmp *bpmp,
+					 unsigned int mrq,
+					 tegra_bpmp_mrq_handler_t handler,
+					 void *data)
+{
+	return -ENODEV;
+}
+
+static inline void tegra_bpmp_free_mrq(struct tegra_bpmp *bpmp,
+				       unsigned int mrq, void *data)
+{
+}
+
+static inline bool tegra_bpmp_mrq_is_supported(struct tegra_bpmp *bpmp,
+					      unsigned int mrq)
+{
+	return false;
+}
+#endif
+
+void tegra_bpmp_handle_rx(struct tegra_bpmp *bpmp);
+
+#if IS_ENABLED(CONFIG_CLK_TEGRA_BPMP)
+int tegra_bpmp_init_clocks(struct tegra_bpmp *bpmp);
+#else
+static inline int tegra_bpmp_init_clocks(struct tegra_bpmp *bpmp)
+{
+	return 0;
+}
+#endif
+
+#if IS_ENABLED(CONFIG_RESET_TEGRA_BPMP)
+int tegra_bpmp_init_resets(struct tegra_bpmp *bpmp);
+#else
+static inline int tegra_bpmp_init_resets(struct tegra_bpmp *bpmp)
+{
+	return 0;
+}
+#endif
+
+#if IS_ENABLED(CONFIG_SOC_TEGRA_POWERGATE_BPMP)
+int tegra_bpmp_init_powergates(struct tegra_bpmp *bpmp);
+#else
+static inline int tegra_bpmp_init_powergates(struct tegra_bpmp *bpmp)
+{
+	return 0;
+}
+#endif
+
+#if IS_ENABLED(CONFIG_DEBUG_FS)
+int tegra_bpmp_init_debugfs(struct tegra_bpmp *bpmp);
+#else
+static inline int tegra_bpmp_init_debugfs(struct tegra_bpmp *bpmp)
+{
+	return 0;
+}
+#endif
+
+
+#endif /* __SOC_TEGRA_BPMP_H */