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, 175 insertions, 0 deletions

diff --git a/lib/tests/shdi3_kunit.c b/lib/tests/shdi3_kunit.c
new file mode 100644
index 000000000..44f65e665
--- /dev/null
+++ b/lib/tests/shdi3_kunit.c
@@ -0,0 +1,175 @@
+// SPDX-License-Identifier: GPL-2.0-or-later OR Apache-2.0
+/*
+ * Test cases for __ashldi3(), __ashrdi3(), and __lshrdi3().
+ */
+
+#include <linux/array_size.h>
+#include <linux/module.h>
+#include <linux/libgcc.h>
+#include <kunit/test.h>
+
+struct shdi3_test_entry {
+	long long input;
+	int shift;
+	long long result;
+};
+
+static const struct shdi3_test_entry ashldi3_testdata[] = {
+	/* https://github.com/llvm/llvm-project/compiler-rt/test/builtins/Unit/ashldi3_test.c */
+	{ 0x0123456789ABCDEFLL, 0, 0x123456789ABCDEFLL },
+	{ 0x0123456789ABCDEFLL, 1, 0x2468ACF13579BDELL },
+	{ 0x0123456789ABCDEFLL, 2, 0x48D159E26AF37BCLL },
+	{ 0x0123456789ABCDEFLL, 3, 0x91A2B3C4D5E6F78LL },
+	{ 0x0123456789ABCDEFLL, 4, 0x123456789ABCDEF0LL },
+	{ 0x0123456789ABCDEFLL, 28, 0x789ABCDEF0000000LL },
+	{ 0x0123456789ABCDEFLL, 29, 0xF13579BDE0000000LL },
+	{ 0x0123456789ABCDEFLL, 30, 0xE26AF37BC0000000LL },
+	{ 0x0123456789ABCDEFLL, 31, 0xC4D5E6F780000000LL },
+	{ 0x0123456789ABCDEFLL, 32, 0x89ABCDEF00000000LL },
+	{ 0x0123456789ABCDEFLL, 33, 0x13579BDE00000000LL },
+	{ 0x0123456789ABCDEFLL, 34, 0x26AF37BC00000000LL },
+	{ 0x0123456789ABCDEFLL, 35, 0x4D5E6F7800000000LL },
+	{ 0x0123456789ABCDEFLL, 36, 0x9ABCDEF000000000LL },
+	{ 0x0123456789ABCDEFLL, 60, 0xF000000000000000LL },
+	{ 0x0123456789ABCDEFLL, 61, 0xE000000000000000LL },
+	{ 0x0123456789ABCDEFLL, 62, 0xC000000000000000LL },
+	{ 0x0123456789ABCDEFLL, 63, 0x8000000000000000LL },
+};
+
+static void shdi3_test_ashldi3(struct kunit *test)
+{
+	const struct shdi3_test_entry *e;
+	long long ret;
+
+	for (e = ashldi3_testdata;
+	     e < ashldi3_testdata + ARRAY_SIZE(ashldi3_testdata); e++) {
+		ret = __ashldi3(e->input, e->shift);
+		KUNIT_EXPECT_EQ_MSG(test, ret, e->result,
+				    "    when evaluating __ashldi3(%lld, %d)",
+				    e->input, e->shift);
+	}
+}
+
+static const struct shdi3_test_entry ashrdi3_testdata[] = {
+	/* https://github.com/llvm/llvm-project/compiler-rt/test/builtins/Unit/ashrdi3_test.c */
+	{ 0x0123456789ABCDEFLL, 0, 0x123456789ABCDEFLL },
+	{ 0x0123456789ABCDEFLL, 1, 0x91A2B3C4D5E6F7LL },
+	{ 0x0123456789ABCDEFLL, 2, 0x48D159E26AF37BLL },
+	{ 0x0123456789ABCDEFLL, 3, 0x2468ACF13579BDLL },
+	{ 0x0123456789ABCDEFLL, 4, 0x123456789ABCDELL },
+	{ 0x0123456789ABCDEFLL, 28, 0x12345678LL },
+	{ 0x0123456789ABCDEFLL, 29, 0x91A2B3CLL },
+	{ 0x0123456789ABCDEFLL, 30, 0x48D159ELL },
+	{ 0x0123456789ABCDEFLL, 31, 0x2468ACFLL },
+	{ 0x0123456789ABCDEFLL, 32, 0x1234567LL },
+	{ 0x0123456789ABCDEFLL, 33, 0x91A2B3LL },
+	{ 0x0123456789ABCDEFLL, 34, 0x48D159LL },
+	{ 0x0123456789ABCDEFLL, 35, 0x2468ACLL },
+	{ 0x0123456789ABCDEFLL, 36, 0x123456LL },
+	{ 0x0123456789ABCDEFLL, 60, 0 },
+	{ 0x0123456789ABCDEFLL, 61, 0 },
+	{ 0x0123456789ABCDEFLL, 62, 0 },
+	{ 0x0123456789ABCDEFLL, 63, 0 },
+	{ 0xFEDCBA9876543210LL, 0, 0xFEDCBA9876543210LL },
+	{ 0xFEDCBA9876543210LL, 1, 0xFF6E5D4C3B2A1908LL },
+	{ 0xFEDCBA9876543210LL, 2, 0xFFB72EA61D950C84LL },
+	{ 0xFEDCBA9876543210LL, 3, 0xFFDB97530ECA8642LL },
+	{ 0xFEDCBA9876543210LL, 4, 0xFFEDCBA987654321LL },
+	{ 0xFEDCBA9876543210LL, 28, 0xFFFFFFFFEDCBA987LL },
+	{ 0xFEDCBA9876543210LL, 29, 0xFFFFFFFFF6E5D4C3LL },
+	{ 0xFEDCBA9876543210LL, 30, 0xFFFFFFFFFB72EA61LL },
+	{ 0xFEDCBA9876543210LL, 31, 0xFFFFFFFFFDB97530LL },
+	{ 0xFEDCBA9876543210LL, 32, 0xFFFFFFFFFEDCBA98LL },
+	{ 0xFEDCBA9876543210LL, 33, 0xFFFFFFFFFF6E5D4CLL },
+	{ 0xFEDCBA9876543210LL, 34, 0xFFFFFFFFFFB72EA6LL },
+	{ 0xFEDCBA9876543210LL, 35, 0xFFFFFFFFFFDB9753LL },
+	{ 0xFEDCBA9876543210LL, 36, 0xFFFFFFFFFFEDCBA9LL },
+	{ 0xAEDCBA9876543210LL, 60, 0xFFFFFFFFFFFFFFFALL },
+	{ 0xAEDCBA9876543210LL, 61, 0xFFFFFFFFFFFFFFFDLL },
+	{ 0xAEDCBA9876543210LL, 62, 0xFFFFFFFFFFFFFFFELL },
+	{ 0xAEDCBA9876543210LL, 63, 0xFFFFFFFFFFFFFFFFLL },
+};
+
+static void shdi3_test_ashrdi3(struct kunit *test)
+{
+	const struct shdi3_test_entry *e;
+	long long ret;
+
+	for (e = ashrdi3_testdata;
+	     e < ashrdi3_testdata + ARRAY_SIZE(ashrdi3_testdata); e++) {
+		ret = __ashrdi3(e->input, e->shift);
+		KUNIT_EXPECT_EQ_MSG(test, ret, e->result,
+				    "    when evaluating __ashrdi3(%lld, %d)",
+				    e->input, e->shift);
+	}
+}
+
+static const struct shdi3_test_entry lshrdi3_testdata[] = {
+	/* https://github.com/llvm/llvm-project/compiler-rt/test/builtins/Unit/lshrdi3_test.c */
+	{ 0x0123456789ABCDEFLL, 0, 0x123456789ABCDEFLL },
+	{ 0x0123456789ABCDEFLL, 1, 0x91A2B3C4D5E6F7LL },
+	{ 0x0123456789ABCDEFLL, 2, 0x48D159E26AF37BLL },
+	{ 0x0123456789ABCDEFLL, 3, 0x2468ACF13579BDLL },
+	{ 0x0123456789ABCDEFLL, 4, 0x123456789ABCDELL },
+	{ 0x0123456789ABCDEFLL, 28, 0x12345678LL },
+	{ 0x0123456789ABCDEFLL, 29, 0x91A2B3CLL },
+	{ 0x0123456789ABCDEFLL, 30, 0x48D159ELL },
+	{ 0x0123456789ABCDEFLL, 31, 0x2468ACFLL },
+	{ 0x0123456789ABCDEFLL, 32, 0x1234567LL },
+	{ 0x0123456789ABCDEFLL, 33, 0x91A2B3LL },
+	{ 0x0123456789ABCDEFLL, 34, 0x48D159LL },
+	{ 0x0123456789ABCDEFLL, 35, 0x2468ACLL },
+	{ 0x0123456789ABCDEFLL, 36, 0x123456LL },
+	{ 0x0123456789ABCDEFLL, 60, 0 },
+	{ 0x0123456789ABCDEFLL, 61, 0 },
+	{ 0x0123456789ABCDEFLL, 62, 0 },
+	{ 0x0123456789ABCDEFLL, 63, 0 },
+	{ 0xFEDCBA9876543210LL, 0, 0xFEDCBA9876543210LL },
+	{ 0xFEDCBA9876543210LL, 1, 0x7F6E5D4C3B2A1908LL },
+	{ 0xFEDCBA9876543210LL, 2, 0x3FB72EA61D950C84LL },
+	{ 0xFEDCBA9876543210LL, 3, 0x1FDB97530ECA8642LL },
+	{ 0xFEDCBA9876543210LL, 4, 0xFEDCBA987654321LL },
+	{ 0xFEDCBA9876543210LL, 28, 0xFEDCBA987LL },
+	{ 0xFEDCBA9876543210LL, 29, 0x7F6E5D4C3LL },
+	{ 0xFEDCBA9876543210LL, 30, 0x3FB72EA61LL },
+	{ 0xFEDCBA9876543210LL, 31, 0x1FDB97530LL },
+	{ 0xFEDCBA9876543210LL, 32, 0xFEDCBA98LL },
+	{ 0xFEDCBA9876543210LL, 33, 0x7F6E5D4CLL },
+	{ 0xFEDCBA9876543210LL, 34, 0x3FB72EA6LL },
+	{ 0xFEDCBA9876543210LL, 35, 0x1FDB9753LL },
+	{ 0xFEDCBA9876543210LL, 36, 0xFEDCBA9LL },
+	{ 0xAEDCBA9876543210LL, 60, 0xALL },
+	{ 0xAEDCBA9876543210LL, 61, 0x5LL },
+	{ 0xAEDCBA9876543210LL, 62, 0x2LL },
+	{ 0xAEDCBA9876543210LL, 63, 0x1LL },
+};
+
+static void shdi3_test_lshrdi3(struct kunit *test)
+{
+	const struct shdi3_test_entry *e;
+	long long ret;
+
+	for (e = lshrdi3_testdata;
+	     e < lshrdi3_testdata + ARRAY_SIZE(lshrdi3_testdata); e++) {
+		ret = __lshrdi3(e->input, e->shift);
+		KUNIT_EXPECT_EQ_MSG(test, ret, e->result,
+				    "    when evaluating __lshrdi3(%lld, %d)",
+				    e->input, e->shift);
+	}
+}
+
+static struct kunit_case shdi3_test_cases[] = {
+	KUNIT_CASE(shdi3_test_ashldi3),
+	KUNIT_CASE(shdi3_test_ashrdi3),
+	KUNIT_CASE(shdi3_test_lshrdi3),
+	{}
+};
+
+static struct kunit_suite shdi3_test_suite = {
+	.name = "shdi3",
+	.test_cases = shdi3_test_cases,
+};
+kunit_test_suite(shdi3_test_suite);
+
+MODULE_DESCRIPTION("Test cases for __ashldi3(), __ashrdi3(), and __lshrdi3()");
+MODULE_LICENSE("GPL");