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, 95 insertions, 0 deletions

diff --git a/drivers/remoteproc/qcom_common.h b/drivers/remoteproc/qcom_common.h
new file mode 100644
index 000000000..b0e7e336d
--- /dev/null
+++ b/drivers/remoteproc/qcom_common.h
@@ -0,0 +1,95 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __RPROC_QCOM_COMMON_H__
+#define __RPROC_QCOM_COMMON_H__
+
+#include <linux/remoteproc.h>
+#include "remoteproc_internal.h"
+#include <linux/soc/qcom/qmi.h>
+
+struct qcom_glink_smem;
+struct qcom_sysmon;
+
+struct qcom_rproc_glink {
+	struct rproc_subdev subdev;
+
+	const char *ssr_name;
+
+	struct device *dev;
+	struct device_node *node;
+	struct qcom_glink_smem *edge;
+};
+
+struct qcom_rproc_subdev {
+	struct rproc_subdev subdev;
+
+	struct device *dev;
+	struct device_node *node;
+	struct qcom_smd_edge *edge;
+};
+
+struct qcom_ssr_subsystem;
+
+struct qcom_rproc_ssr {
+	struct rproc_subdev subdev;
+	struct qcom_ssr_subsystem *info;
+};
+
+struct qcom_rproc_pdm {
+	struct rproc_subdev subdev;
+	struct device *dev;
+	int index;
+	struct auxiliary_device *adev;
+};
+
+void qcom_minidump(struct rproc *rproc, unsigned int minidump_id,
+			void (*rproc_dumpfn_t)(struct rproc *rproc,
+				struct rproc_dump_segment *segment, void *dest, size_t offset,
+				size_t size));
+
+void qcom_add_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink,
+			   const char *ssr_name);
+void qcom_remove_glink_subdev(struct rproc *rproc, struct qcom_rproc_glink *glink);
+
+int qcom_register_dump_segments(struct rproc *rproc, const struct firmware *fw);
+
+void qcom_add_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd);
+void qcom_remove_smd_subdev(struct rproc *rproc, struct qcom_rproc_subdev *smd);
+
+void qcom_add_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr,
+			 const char *ssr_name);
+void qcom_remove_ssr_subdev(struct rproc *rproc, struct qcom_rproc_ssr *ssr);
+
+void qcom_add_pdm_subdev(struct rproc *rproc, struct qcom_rproc_pdm *pdm);
+void qcom_remove_pdm_subdev(struct rproc *rproc, struct qcom_rproc_pdm *pdm);
+
+#if IS_ENABLED(CONFIG_QCOM_SYSMON)
+struct qcom_sysmon *qcom_add_sysmon_subdev(struct rproc *rproc,
+					   const char *name,
+					   int ssctl_instance);
+void qcom_remove_sysmon_subdev(struct qcom_sysmon *sysmon);
+bool qcom_sysmon_shutdown_acked(struct qcom_sysmon *sysmon);
+bool qcom_sysmon_shutdown_irq_state(struct qcom_sysmon *sysmon);
+#else
+static inline struct qcom_sysmon *qcom_add_sysmon_subdev(struct rproc *rproc,
+							 const char *name,
+							 int ssctl_instance)
+{
+	return NULL;
+}
+
+static inline void qcom_remove_sysmon_subdev(struct qcom_sysmon *sysmon)
+{
+}
+
+static inline bool qcom_sysmon_shutdown_acked(struct qcom_sysmon *sysmon)
+{
+	return false;
+}
+
+static inline bool qcom_sysmon_shutdown_irq_state(struct qcom_sysmon *sysmon)
+{
+	return false;
+}
+#endif
+
+#endif