ARM: 9485/1: mm: acquire mmap write lock around show_pte() for user faultsgrafted

When CONFIG_DEBUG_USER=y, and cmdline "user_debug=31" is set,
a user fault may trigger show_pte() without any lock.
If another thread in the same process concurrently calls munmap(),
the page table pages may be freed while show_pte() is still traversing
them, causing a use-after-free in show_pte().

If CONFIG_ARM_LPAE=y, this may cause a kernel panic if the pages table
of PMD are freed when show_pte() is running.

Acquire mmap_write_lock() around show_pte() for user faults to fix the
contention.

For user faults, additionally restrict that show_pte() is called only
when the addr is a user-space address (addr < TASK_SIZE). This is because
the lock of tsk->mm only protects the virtual memory of user address space,
furthermore, dumping the page tables of a kernel-space address for user
faults is unnecessary and may have security implications.

Keep everything unchanged for kernel faults, because the kernel is
already in the "oops" state, acquiring a lock may risk a deadlock.

Co-developed-by: Qi Xi <xiqi2@huawei.com>

Fixes: 6d021b724481 ("ARM: dump pgd, pmd and pte states on unhandled data abort faults")
Link: https://lore.kernel.org/20260716014022.2823-1-xieyuanbin1@huawei.com
Acked-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Reviewed-by: Linus Walleij <linusw@kernel.org>
Signed-off-by: Qi Xi <xiqi2@huawei.com>
Signed-off-by: Xie Yuanbin <xieyuanbin1@huawei.com>
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>

1 files changed, 61 insertions, 0 deletions

diff --git a/sound/soc/sof/Makefile b/sound/soc/sof/Makefile
new file mode 100644
index 000000000..b0b22e6eb
--- /dev/null
+++ b/sound/soc/sof/Makefile
@@ -0,0 +1,61 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
+
+snd-sof-y := core.o ops.o loader.o ipc.o pcm.o pm.o debug.o topology.o\
+		control.o trace.o iomem-utils.o sof-audio.o stream-ipc.o\
+		fw-file-profile.o
+
+# IPC implementations
+ifneq ($(CONFIG_SND_SOC_SOF_IPC3),)
+snd-sof-y +=	ipc3.o ipc3-loader.o ipc3-topology.o ipc3-control.o ipc3-pcm.o\
+		ipc3-dtrace.o
+endif
+ifneq ($(CONFIG_SND_SOC_SOF_IPC4),)
+snd-sof-y += ipc4.o ipc4-loader.o ipc4-topology.o ipc4-control.o ipc4-pcm.o\
+		ipc4-mtrace.o ipc4-telemetry.o
+endif
+
+# SOF client support
+ifneq ($(CONFIG_SND_SOC_SOF_CLIENT),)
+snd-sof-y += sof-client.o
+endif
+
+snd-sof-$(CONFIG_SND_SOC_SOF_COMPRESS) += compress.o
+
+snd-sof-pci-y := sof-pci-dev.o
+snd-sof-acpi-y := sof-acpi-dev.o
+snd-sof-of-y := sof-of-dev.o
+
+snd-sof-ipc-flood-test-y := sof-client-ipc-flood-test.o
+snd-sof-ipc-msg-injector-y := sof-client-ipc-msg-injector.o
+snd-sof-ipc-kernel-injector-y := sof-client-ipc-kernel-injector.o
+snd-sof-probes-y := sof-client-probes.o
+ifneq ($(CONFIG_SND_SOC_SOF_IPC3),)
+snd-sof-probes-y += sof-client-probes-ipc3.o
+endif
+ifneq ($(CONFIG_SND_SOC_SOF_IPC4),)
+snd-sof-probes-y += sof-client-probes-ipc4.o
+endif
+
+snd-sof-nocodec-y := nocodec.o
+
+snd-sof-utils-y := sof-utils.o
+
+obj-$(CONFIG_SND_SOC_SOF) += snd-sof.o
+obj-$(CONFIG_SND_SOC_SOF_NOCODEC) += snd-sof-nocodec.o
+
+obj-$(CONFIG_SND_SOC_SOF) += snd-sof-utils.o
+
+obj-$(CONFIG_SND_SOC_SOF_ACPI_DEV) += snd-sof-acpi.o
+obj-$(CONFIG_SND_SOC_SOF_OF_DEV) += snd-sof-of.o
+obj-$(CONFIG_SND_SOC_SOF_PCI_DEV) += snd-sof-pci.o
+
+obj-$(CONFIG_SND_SOC_SOF_DEBUG_IPC_FLOOD_TEST) += snd-sof-ipc-flood-test.o
+obj-$(CONFIG_SND_SOC_SOF_DEBUG_IPC_MSG_INJECTOR) += snd-sof-ipc-msg-injector.o
+obj-$(CONFIG_SND_SOC_SOF_DEBUG_IPC_KERNEL_INJECTOR) += snd-sof-ipc-kernel-injector.o
+obj-$(CONFIG_SND_SOC_SOF_DEBUG_PROBES) += snd-sof-probes.o
+
+obj-$(CONFIG_SND_SOC_SOF_INTEL_TOPLEVEL) += intel/
+obj-$(CONFIG_SND_SOC_SOF_IMX_TOPLEVEL) += imx/
+obj-$(CONFIG_SND_SOC_SOF_AMD_TOPLEVEL) += amd/
+obj-$(CONFIG_SND_SOC_SOF_XTENSA) += xtensa/
+obj-$(CONFIG_SND_SOC_SOF_MTK_TOPLEVEL) += mediatek/