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, 138 insertions, 0 deletions

diff --git a/sound/hda/codecs/Kconfig b/sound/hda/codecs/Kconfig
new file mode 100644
index 000000000..dcf340e5a
--- /dev/null
+++ b/sound/hda/codecs/Kconfig
@@ -0,0 +1,138 @@
+# SPDX-License-Identifier: GPL-2.0-only
+if SND_HDA
+
+config SND_HDA_GENERIC_LEDS
+       bool
+
+config SND_HDA_CODEC_ANALOG
+	tristate "Build Analog Devices HD-audio codec support"
+	select SND_HDA_GENERIC
+	help
+	  Say Y or M here to include Analog Devices HD-audio codec support in
+	  snd-hda-intel driver, such as AD1986A.
+
+comment "Set to Y if you want auto-loading the codec driver"
+	depends on SND_HDA=y && SND_HDA_CODEC_ANALOG=m
+
+config SND_HDA_CODEC_SIGMATEL
+	tristate "Build IDT/Sigmatel HD-audio codec support"
+	select SND_HDA_GENERIC
+	select SND_HDA_GENERIC_LEDS
+	help
+	  Say Y or M here to include IDT (Sigmatel) HD-audio codec support in
+	  snd-hda-intel driver, such as STAC9200.
+
+comment "Set to Y if you want auto-loading the codec driver"
+	depends on SND_HDA=y && SND_HDA_CODEC_SIGMATEL=m
+
+config SND_HDA_CODEC_VIA
+	tristate "Build VIA HD-audio codec support"
+	select SND_HDA_GENERIC
+	help
+	  Say Y or M here to include VIA HD-audio codec support in
+	  snd-hda-intel driver, such as VT1708.
+
+comment "Set to Y if you want auto-loading the codec driver"
+	depends on SND_HDA=y && SND_HDA_CODEC_VIA=m
+
+config SND_HDA_CODEC_CONEXANT
+	tristate "Build Conexant HD-audio codec support"
+	select SND_HDA_GENERIC
+	select SND_HDA_GENERIC_LEDS
+	help
+	  Say Y or M here to include Conexant HD-audio codec support in
+	  snd-hda-intel driver, such as CX20549.
+
+comment "Set to Y if you want auto-loading the codec driver"
+	depends on SND_HDA=y && SND_HDA_CODEC_CONEXANT=m
+
+config SND_HDA_CODEC_SENARYTECH
+	tristate "Build Senarytech HD-audio codec support"
+	select SND_HDA_GENERIC
+	select SND_HDA_GENERIC_LEDS
+	help
+	  Say Y or M here to include Senarytech HD-audio codec support in
+	  snd-hda-intel driver, such as SN6186.
+
+comment "Set to Y if you want auto-loading the codec driver"
+	depends on SND_HDA=y && SND_HDA_CODEC_SENARYTECH=m
+
+config SND_HDA_CODEC_CA0110
+	tristate "Build Creative CA0110-IBG codec support"
+	select SND_HDA_GENERIC
+	help
+	  Say Y or M here to include Creative CA0110-IBG codec support in
+	  snd-hda-intel driver, found on some Creative X-Fi cards.
+
+comment "Set to Y if you want auto-loading the codec driver"
+	depends on SND_HDA=y && SND_HDA_CODEC_CA0110=m
+
+config SND_HDA_CODEC_CA0132
+	tristate "Build Creative CA0132 codec support"
+	select SND_HDA_GENERIC
+	help
+	  Say Y or M here to include Creative CA0132 codec support in
+	  snd-hda-intel driver.
+
+comment "Set to Y if you want auto-loading the codec driver"
+	depends on SND_HDA=y && SND_HDA_CODEC_CA0132=m
+
+config SND_HDA_CODEC_CA0132_DSP
+	bool "Support new DSP code for CA0132 codec"
+	depends on SND_HDA_CODEC_CA0132
+	default y
+	select SND_HDA_DSP_LOADER
+	select FW_LOADER
+	help
+	  Say Y here to enable the DSP for Creative CA0132 for extended
+	  features like equalizer or echo cancellation.
+
+	  Note that this option requires the external firmware file
+	  (ctefx.bin).
+
+config SND_HDA_CODEC_CMEDIA
+	tristate "Build C-Media HD-audio codec support"
+	select SND_HDA_GENERIC
+	help
+	  Say Y or M here to include C-Media HD-audio codec support in
+	  snd-hda-intel driver, such as CMI9880.
+
+comment "Set to Y if you want auto-loading the codec driver"
+	depends on SND_HDA=y && SND_HDA_CODEC_CMEDIA=m
+
+config SND_HDA_CODEC_CM9825
+	tristate "Build C-Media CM9825 HD-audio codec support"
+	select SND_HDA_GENERIC
+	help
+	  Say Y or M here to include C-Media CM9825 HD-audio codec support in
+	  snd-hda-intel driver
+
+comment "Set to Y if you want auto-loading the codec driver"
+	depends on SND_HDA=y && SND_HDA_CODEC_CM9825=m
+
+config SND_HDA_CODEC_SI3054
+	tristate "Build Silicon Labs 3054 HD-modem codec support"
+	help
+	  Say Y or M here to include Silicon Labs 3054 HD-modem codec
+	  (and compatibles) support in snd-hda-intel driver.
+
+comment "Set to Y if you want auto-loading the codec driver"
+	depends on SND_HDA=y && SND_HDA_CODEC_SI3054=m
+
+config SND_HDA_GENERIC
+	tristate "Enable generic HD-audio codec parser"
+	select SND_CTL_LED if SND_HDA_GENERIC_LEDS
+	select LEDS_CLASS if SND_HDA_GENERIC_LEDS
+	help
+	  Say Y or M here to enable the generic HD-audio codec parser
+	  in snd-hda-intel driver.
+
+comment "Set to Y if you want auto-loading the codec driver"
+	depends on SND_HDA=y && SND_HDA_GENERIC=m
+
+source "sound/hda/codecs/realtek/Kconfig"
+source "sound/hda/codecs/cirrus/Kconfig"
+source "sound/hda/codecs/hdmi/Kconfig"
+source "sound/hda/codecs/side-codecs/Kconfig"
+
+endif # SND_HDA