x86/kprobes: Fix crash when probing CS CALL instructionsgrafted

When using eBPF to probe CS CALL instructions within a function,
a crash can be triggered.

The eBPF tool probes offset 257 of the __hrtimer_run_queues()
function:

<__hrtimer_run_queues+249>:  nopl   0x0(%rax,%rax,1)
<__hrtimer_run_queues+254>:  mov    %r14,%rdi
<__hrtimer_run_queues+257>:  cs call <__x86_indirect_thunk_r12>
<__hrtimer_run_queues+263>:  mov    %eax,%r12d
<__hrtimer_run_queues+266>:  xchg   %ax,%ax
<__hrtimer_run_queues+268>:  mov    %r13,%rdi

Which triggers this crash:

  BUG: unable to handle page fault for address: 00000000000f41c9
  #PF: supervisor write access in kernel mode
  #PF: error_code(0x0002) - not-present page
  PGD 0 P4D 0
  Oops: 0002 [#1] SMP NOPTI
  CPU: 1 PID: 0 Comm: swapper/1 Kdump: loaded Tainted: P
  RIP: 0010:__hrtimer_run_queues+0x106/0x230

Note that __hrtimer_run_queues+0x106 is __hrtimer_run_queues+262, which is
at the 6th byte of the above CS CALL instruction. Since the CS CALL
instruction occupies 6 bytes, the exception occurred in the middle of that
call instruction.

The root cause is that when using eBPF tools to probe in the middle of a
function, a kprobe with INT3 is used as the underlying implementation.

During single-step emulation of the original CALL instruction,
int3_emulate_call() assumes that the probed CALL instruction is 5 bytes
long. However, the actual CS-prefixed CALL instruction occupies 6 bytes,
so it constructs an incorrect exception return address. When the CPU
returns from the kprobe handler, the next instruction to be executed is at
the address of the last byte of that CS CALL instruction. Coincidentally,
starting from that address, the CPU fetches and decodes a completely
different instruction, which ultimately triggers a kernel crash.

Fix the issue by using the actual instruction length obtained from
the instruction decoder when constructing the exception return
address, rather than relying on the hardcoded CALL_INSN_SIZE macro.

[ mingo: Refined the changelog ]

Fixes: 6256e668b7af ("x86/kprobes: Use int3 instead of debug trap for single-step")
Suggested-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Signed-off-by: Jinke Han <jinkehan@didiglobal.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>
Acked-by: Yafang Shao <laoar.shao@gmail.com>
Acked-by: Borislav Petkov <bp@alien8.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://patch.msgid.link/20260908073742.GA10517@didi-ThinkCentre-M920t-N000

1 files changed, 66 insertions, 0 deletions

diff --git a/drivers/gpu/Makefile b/drivers/gpu/Makefile
new file mode 100644
index 000000000..e372fc021
--- /dev/null
+++ b/drivers/gpu/Makefile
@@ -0,0 +1,66 @@
+# SPDX-License-Identifier: GPL-2.0-only
+# drm/tegra depends on host1x, so if both drivers are built-in care must be
+# taken to initialize them in the correct order. Link order is the only way
+# to ensure this currently.
+# Similarly, buddy must come first since it is used by other drivers.
+obj-$(CONFIG_GPU_BUDDY)	+= buddy.o
+obj-y			+= host1x/ drm/ vga/ tests/
+obj-$(CONFIG_IMX_IPUV3_CORE)	+= ipu-v3/
+obj-$(CONFIG_TRACE_GPU_MEM)		+= trace/
+
+# nova-core and nova-drm are built from this Makefile so nova-drm's dependency
+# on nova-core can be expressed as a plain Make prerequisite rather than a
+# recursive sub-make. This is a temporary workaround until the Rust build
+# system supports cross-crate dependencies natively.
+
+obj-$(CONFIG_NOVA_CORE) += nova-core.o
+nova-core-y := nova-core/nova_core.o nova-core/nova_core_exports.o
+
+obj-$(CONFIG_DRM_NOVA) += nova-drm.o
+nova-drm-y := drm/nova/nova.o
+
+# Export Rust symbols from nova-core only if nova-drm actually references them.
+nova-core-export-deps := $(if $(CONFIG_DRM_NOVA),$(obj)/drm/nova/nova.o)
+
+rust_needed_exports = \
+	{ $(if $(strip $(2)),$(NM) -u $(2);,) echo "__DEFINED_RUST_SYMBOLS__"; \
+	  $(NM) -p --defined-only $(1); } | \
+	awk -v fmt='$(3)' ' \
+		/^__DEFINED_RUST_SYMBOLS__$$/ { defs = 1; next } \
+		!defs { if ($$NF ~ /^_R/) needed[$$NF] = 1; next } \
+		defs && $$2 ~ /(T|R|D|B)/ && $$3 ~ /^_R/ && \
+			$$3 !~ /_(init|cleanup)_module$$/ && \
+			$$3 !~ /__(pfx|cfi|odr_asan)/ && \
+			$$3 in needed { printf fmt, $$3 } \
+	'
+
+quiet_cmd_exports = EXPORTS $@
+      cmd_exports = \
+	$(call rust_needed_exports,$<,$(nova-core-export-deps),EXPORT_SYMBOL_RUST_GPL(%s);\n) > $@
+
+$(obj)/nova-core/exports_nova_core_generated.h: $(obj)/nova-core/nova_core.o $(nova-core-export-deps) FORCE
+	$(call if_changed,exports)
+
+targets += nova-core/exports_nova_core_generated.h
+
+$(obj)/nova-core/nova_core_exports.o: $(obj)/nova-core/exports_nova_core_generated.h
+CFLAGS_nova-core/nova_core_exports.o := -I $(objtree)/$(obj)/nova-core
+
+ifdef CONFIG_MODVERSIONS
+# The C export shim declares Rust symbols as `extern int`, so reuse its export
+# list but generate symbol CRCs from the Rust object instead of the shim's DWARF.
+$(obj)/nova-core/nova_core_exports.o: private cmd_gensymtypes_c = \
+	$(call getexportsymbols,\1) | \
+	$(objtree)/scripts/gendwarfksyms/gendwarfksyms \
+		$(if $(KBUILD_GENDWARFKSYMS_STABLE), --stable) \
+		$(if $(KBUILD_SYMTYPES), --symtypes $(@:.o=.symtypes),) \
+		$(obj)/nova-core/nova_core.o
+endif
+
+# Output nova-core's crate metadata for use by nova-drm at compile time.
+RUSTFLAGS_nova-core/nova_core.o += \
+	--emit=metadata=$(objtree)/$(obj)/nova-core/libnova_core.rmeta
+
+# Allow nova-drm to import nova-core's types.
+$(obj)/drm/nova/nova.o: $(obj)/nova-core/nova_core.o
+RUSTFLAGS_drm/nova/nova.o := -L $(objtree)/$(obj)/nova-core --extern nova_core