selftests/bpf: Reject graph kptr use after RCU unlockgrafted

Add a sleepable verifier test that loads a graph-node local kptr in an
explicit RCU read-side critical section, then passes its node to
bpf_rbtree_remove() after the section ends.

Before the verifier fix, the stale NON_OWN_REF flag makes the node look like
a live borrowed reference and the program is accepted. After the fix, the
pointer is demoted without NON_OWN_REF and the graph kfunc argument is
rejected.

Also exercise a graph kptr loaded while a spin lock provides implicit RCU
protection. The pointer must be invalidated when the lock is released, which
guards the required ordering between non-owning-reference invalidation and
RCU demotion.

Update the existing fault-protected load test state description. The
post-unlock pointer no longer carries NON_OWN_REF, but remains readable
because the load is rewritten to use BPF_PROBE_MEM.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 49 insertions, 0 deletions

diff --git a/drivers/char/tpm/Makefile b/drivers/char/tpm/Makefile
new file mode 100644
index 000000000..5b5cdc0d3
--- /dev/null
+++ b/drivers/char/tpm/Makefile
@@ -0,0 +1,49 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Makefile for the kernel tpm device drivers.
+#
+obj-$(CONFIG_TCG_TPM) += tpm.o
+tpm-y := tpm-chip.o
+tpm-y += tpm-dev-common.o
+tpm-y += tpm-dev.o
+tpm-y += tpm-interface.o
+tpm-y += tpm1-cmd.o
+tpm-y += tpm2-cmd.o
+tpm-y += tpmrm-dev.o
+tpm-y += tpm2-space.o
+tpm-y += tpm-sysfs.o
+tpm-y += eventlog/common.o
+tpm-y += eventlog/tpm1.o
+tpm-y += eventlog/tpm2.o
+tpm-y += tpm-buf.o
+tpm-y += tpm2-sessions.o
+
+tpm-$(CONFIG_ACPI) += tpm_ppi.o eventlog/acpi.o
+tpm-$(CONFIG_EFI) += eventlog/efi.o
+tpm-$(CONFIG_OF) += eventlog/of.o
+obj-$(CONFIG_TCG_TIS_CORE) += tpm_tis_core.o
+obj-$(CONFIG_TCG_TIS) += tpm_tis.o
+obj-$(CONFIG_TCG_TIS_SYNQUACER) += tpm_tis_synquacer.o
+
+obj-$(CONFIG_TCG_TIS_SPI) += tpm_tis_spi.o
+tpm_tis_spi-y := tpm_tis_spi_main.o
+tpm_tis_spi-$(CONFIG_TCG_TIS_SPI_CR50) += tpm_tis_spi_cr50.o
+
+obj-$(CONFIG_TCG_TIS_I2C_CR50) += tpm_tis_i2c_cr50.o
+
+obj-$(CONFIG_TCG_TIS_I2C) += tpm_tis_i2c.o
+obj-$(CONFIG_TCG_TIS_I2C_ATMEL) += tpm_i2c_atmel.o
+obj-$(CONFIG_TCG_TIS_I2C_INFINEON) += tpm_i2c_infineon.o
+obj-$(CONFIG_TCG_TIS_I2C_NUVOTON) += tpm_i2c_nuvoton.o
+obj-$(CONFIG_TCG_NSC) += tpm_nsc.o
+obj-$(CONFIG_TCG_ATMEL) += tpm_atmel.o
+obj-$(CONFIG_TCG_INFINEON) += tpm_infineon.o
+obj-$(CONFIG_TCG_IBMVTPM) += tpm_ibmvtpm.o
+obj-$(CONFIG_TCG_TIS_ST33ZP24) += st33zp24/
+obj-$(CONFIG_TCG_XEN) += xen-tpmfront.o
+obj-$(CONFIG_TCG_CRB) += tpm_crb.o
+obj-$(CONFIG_TCG_ARM_CRB_FFA) += tpm_crb_ffa.o
+obj-$(CONFIG_TCG_VTPM_PROXY) += tpm_vtpm_proxy.o
+obj-$(CONFIG_TCG_FTPM_TEE) += tpm_ftpm_tee.o
+obj-$(CONFIG_TCG_SVSM) += tpm_svsm.o
+obj-$(CONFIG_TCG_LOONGSON) += tpm_loongson.o