From 1f6d3a8f5e397f5d31afbc58d84e1dc68318b874 Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu Date: Mon, 25 Oct 2021 20:41:52 +0900 Subject: kprobes: Add a test case for stacktrace from kretprobe handler Add a test case for stacktrace from kretprobe handler and nested kretprobe handlers. This test checks both of stack trace inside kretprobe handler and stack trace from pt_regs. Those stack trace must include actual function return address instead of kretprobe trampoline. The nested kretprobe stacktrace test checks whether the unwinder can correctly unwind the call frame on the stack which has been modified by the kretprobe. Since the stacktrace on kretprobe is correctly fixed only on x86, this introduces a meta kconfig ARCH_CORRECT_STACKTRACE_ON_KRETPROBE which tells user that the stacktrace on kretprobe is correct or not. The test results will be shown like below; TAP version 14 1..1 # Subtest: kprobes_test 1..6 ok 1 - test_kprobe ok 2 - test_kprobes ok 3 - test_kretprobe ok 4 - test_kretprobes ok 5 - test_stacktrace_on_kretprobe ok 6 - test_stacktrace_on_nested_kretprobe # kprobes_test: pass:6 fail:0 skip:0 total:6 # Totals: pass:6 fail:0 skip:0 total:6 ok 1 - kprobes_test Link: https://lkml.kernel.org/r/163516211244.604541.18350507860972214415.stgit@devnote2 Signed-off-by: Masami Hiramatsu Signed-off-by: Steven Rostedt (VMware) --- arch/Kconfig | 8 ++++++++ arch/x86/Kconfig | 1 + 2 files changed, 9 insertions(+) (limited to 'arch') diff --git a/arch/Kconfig b/arch/Kconfig index 8df1c7102643..8378f83b462c 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -191,6 +191,14 @@ config HAVE_OPTPROBES config HAVE_KPROBES_ON_FTRACE bool +config ARCH_CORRECT_STACKTRACE_ON_KRETPROBE + bool + help + Since kretprobes modifies return address on the stack, the + stacktrace may see the kretprobe trampoline address instead + of correct one. If the architecture stacktrace code and + unwinder can adjust such entries, select this configuration. + config HAVE_FUNCTION_ERROR_INJECTION bool diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index e39e2bd6acc5..cc9ba6798848 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -61,6 +61,7 @@ config X86 select ACPI_SYSTEM_POWER_STATES_SUPPORT if ACPI select ARCH_32BIT_OFF_T if X86_32 select ARCH_CLOCKSOURCE_INIT + select ARCH_CORRECT_STACKTRACE_ON_KRETPROBE select ARCH_ENABLE_HUGEPAGE_MIGRATION if X86_64 && HUGETLB_PAGE && MIGRATION select ARCH_ENABLE_MEMORY_HOTPLUG if X86_64 || (X86_32 && HIGHMEM) select ARCH_ENABLE_MEMORY_HOTREMOVE if MEMORY_HOTPLUG -- cgit v1.2.3