bpf: mark a NULL kfunc argument precisegrafted

check_kfunc_arg() allows bpf_register_is_null() for nullable arguments
w/o marking the underlying scalar register precise. Hence a checkpoint
created on such a path would prune against arbitrary scalar value.

Fixes: 3bda08b63670 ("bpf: Allow NULL buffers in bpf_dynptr_slice(_rw)")
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20260904-register-is-null-precise-fixes-v1-5-0f5a360ff15d@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

1 files changed, 48 insertions, 0 deletions

diff --git a/drivers/pnp/Kconfig b/drivers/pnp/Kconfig
new file mode 100644
index 000000000..a72141dff
--- /dev/null
+++ b/drivers/pnp/Kconfig
@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Plug and Play configuration
+#
+
+menuconfig PNP
+	bool "Plug and Play support"
+	depends on HAS_IOMEM
+	depends on ISA || ACPI
+	help
+	  Plug and Play (PnP) is a standard for peripherals which allows those
+	  peripherals to be configured by software, e.g. assign IRQ's or other
+	  parameters. No jumpers on the cards are needed, instead the values
+	  are provided to the cards from the BIOS, from the operating system,
+	  or using a user-space utility.
+
+	  Say Y here if you would like Linux to configure your Plug and Play
+	  devices. You should then also say Y to all of the protocols below.
+	  Alternatively, you can say N here and configure your PnP devices
+	  using user space utilities such as the isapnptools package.
+
+	  If unsure, say Y.
+
+config PNP_DEBUG_MESSAGES
+	default y
+	bool "PNP debugging messages"
+	depends on PNP
+	help
+	  Say Y here if you want the PNP layer to be able to produce debugging
+	  messages if needed.  The messages can be enabled at boot-time with
+	  the pnp.debug kernel parameter.
+
+	  This option allows you to save a bit of space if you do not want
+	  the messages to even be built into the kernel.
+
+	  If you have any doubts about this, say Y here.
+
+if PNP
+
+comment "Protocols"
+
+source "drivers/pnp/isapnp/Kconfig"
+
+source "drivers/pnp/pnpbios/Kconfig"
+
+source "drivers/pnp/pnpacpi/Kconfig"
+
+endif # PNP