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, 106 insertions, 0 deletions

diff --git a/drivers/reset/amlogic/reset-meson.c b/drivers/reset/amlogic/reset-meson.c
new file mode 100644
index 000000000..c303e8590
--- /dev/null
+++ b/drivers/reset/amlogic/reset-meson.c
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
+/*
+ * Amlogic Meson Reset Controller driver
+ *
+ * Copyright (c) 2016-2024 BayLibre, SAS.
+ * Authors: Neil Armstrong <narmstrong@baylibre.com>
+ *          Jerome Brunet <jbrunet@baylibre.com>
+ */
+
+#include <linux/err.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/reset-controller.h>
+
+#include "reset-meson.h"
+
+static const struct meson_reset_param meson8b_param = {
+	.reset_ops	= &meson_reset_ops,
+	.reset_num	= 256,
+	.reset_offset	= 0x0,
+	.level_offset	= 0x7c,
+	.level_low_reset = true,
+};
+
+static const struct meson_reset_param meson_a1_param = {
+	.reset_ops	= &meson_reset_ops,
+	.reset_num	= 96,
+	.reset_offset	= 0x0,
+	.level_offset	= 0x40,
+	.level_low_reset = true,
+};
+
+static const struct meson_reset_param meson_s4_param = {
+	.reset_ops	= &meson_reset_ops,
+	.reset_num	= 192,
+	.reset_offset	= 0x0,
+	.level_offset	= 0x40,
+	.level_low_reset = true,
+};
+
+static const struct meson_reset_param t7_param = {
+	.reset_ops	= &meson_reset_ops,
+	.reset_num      = 224,
+	.reset_offset	= 0x0,
+	.level_offset   = 0x40,
+	.level_low_reset = true,
+};
+
+static const struct of_device_id meson_reset_dt_ids[] = {
+	 { .compatible = "amlogic,meson8b-reset",    .data = &meson8b_param},
+	 { .compatible = "amlogic,meson-gxbb-reset", .data = &meson8b_param},
+	 { .compatible = "amlogic,meson-axg-reset",  .data = &meson8b_param},
+	 { .compatible = "amlogic,meson-a1-reset",   .data = &meson_a1_param},
+	 { .compatible = "amlogic,meson-s4-reset",   .data = &meson_s4_param},
+	 { .compatible = "amlogic,c3-reset",   .data = &meson_s4_param},
+	 { .compatible = "amlogic,t7-reset",   .data = &t7_param},
+	 { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, meson_reset_dt_ids);
+
+static const struct regmap_config regmap_config = {
+	.reg_bits   = 32,
+	.val_bits   = 32,
+	.reg_stride = 4,
+};
+
+static int meson_reset_probe(struct platform_device *pdev)
+{
+	const struct meson_reset_param *param;
+	struct device *dev = &pdev->dev;
+	struct regmap *map;
+	void __iomem *base;
+
+	base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(base))
+		return PTR_ERR(base);
+
+	param = device_get_match_data(dev);
+	if (!param)
+		return -ENODEV;
+
+	map = devm_regmap_init_mmio(dev, base, &regmap_config);
+	if (IS_ERR(map))
+		return dev_err_probe(dev, PTR_ERR(map),
+				     "can't init regmap mmio region\n");
+
+	return meson_reset_controller_register(dev, map, param);
+}
+
+static struct platform_driver meson_reset_driver = {
+	.probe	= meson_reset_probe,
+	.driver = {
+		.name		= "meson_reset",
+		.of_match_table	= meson_reset_dt_ids,
+	},
+};
+module_platform_driver(meson_reset_driver);
+
+MODULE_DESCRIPTION("Amlogic Meson Reset Controller driver");
+MODULE_AUTHOR("Neil Armstrong <narmstrong@baylibre.com>");
+MODULE_AUTHOR("Jerome Brunet <jbrunet@baylibre.com>");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_IMPORT_NS("MESON_RESET");