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, 53 insertions, 0 deletions

diff --git a/drivers/s390/char/Makefile b/drivers/s390/char/Makefile
new file mode 100644
index 000000000..0ad960d00
--- /dev/null
+++ b/drivers/s390/char/Makefile
@@ -0,0 +1,53 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# S/390 character devices
+#
+
+CONTEXT_ANALYSIS := y
+
+ifdef CONFIG_FUNCTION_TRACER
+# Do not trace early setup code
+CFLAGS_REMOVE_sclp_early_core.o	= $(CC_FLAGS_FTRACE)
+endif
+
+GCOV_PROFILE_sclp_early_core.o		:= n
+KCOV_INSTRUMENT_sclp_early_core.o	:= n
+UBSAN_SANITIZE_sclp_early_core.o	:= n
+KASAN_SANITIZE_sclp_early_core.o	:= n
+
+CFLAGS_sclp_early_core.o		+= -D__NO_FORTIFY
+
+CFLAGS_REMOVE_sclp_early_core.o	+= $(CC_FLAGS_EXPOLINE)
+
+obj-y += ctrlchar.o keyboard.o defkeymap.o sclp.o sclp_rw.o sclp_quiesce.o \
+	 sclp_cmd.o sclp_config.o sclp_cpi_sys.o sclp_ocf.o sclp_ctl.o \
+	 sclp_early.o sclp_early_core.o sclp_sd.o
+
+obj-$(CONFIG_MEMORY_HOTPLUG) += sclp_mem.o
+obj-$(CONFIG_TN3270) += raw3270.o con3270.o
+obj-$(CONFIG_TN3270_FS) += fs3270.o
+
+obj-$(CONFIG_TN3215) += con3215.o
+
+obj-$(CONFIG_SCLP_TTY) += sclp_tty.o
+obj-$(CONFIG_SCLP_CONSOLE) += sclp_con.o
+obj-$(CONFIG_SCLP_VT220_TTY) += sclp_vt220.o
+
+obj-$(CONFIG_PCI) += sclp_pci.o
+
+obj-$(subst m,y,$(CONFIG_AP)) += sclp_ap.o
+
+obj-$(CONFIG_VMLOGRDR) += vmlogrdr.o
+obj-$(CONFIG_VMCP) += vmcp.o
+
+tape-$(CONFIG_PROC_FS) += tape_proc.o
+tape_s390-objs := tape_3490.o tape_char.o tape_class.o tape_core.o tape_std.o $(tape-y)
+obj-$(CONFIG_S390_TAPE) += tape_s390.o
+obj-$(CONFIG_MONREADER) += monreader.o
+obj-$(CONFIG_MONWRITER) += monwriter.o
+obj-$(CONFIG_S390_VMUR) += vmur.o
+obj-$(CONFIG_CRASH_DUMP) += sclp_sdias.o zcore.o
+obj-$(CONFIG_S390_UV_UAPI) += uvdevice.o
+
+hmcdrv-objs := hmcdrv_mod.o hmcdrv_dev.o hmcdrv_ftp.o hmcdrv_cache.o diag_ftp.o sclp_ftp.o
+obj-$(CONFIG_HMC_DRV) += hmcdrv.o