Masami Hiramatsu 0eae81dc9f x86/kprobes: Prohibit probing on IRQ handlers directly ... Prohibit probing on IRQ handlers in irqentry_text because if it interrupts user mode, at that point we haven't changed to kernel space yet and which eventually leads a double fault. E.g. # echo p apic_timer_interrupt > kprobe_events # echo 1 > events/kprobes/enable PANIC: double fault, error_code: 0x0 CPU: 1 PID: 814 Comm: less Not tainted 4.20.0-rc3+ #30 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) RIP: 0010:error_entry+0x12/0xf0 [snip] Call Trace: <ENTRY_TRAMPOLINE> ? native_iret+0x7/0x7 ? async_page_fault+0x8/0x30 ? trace_hardirqs_on_thunk+0x1c/0x1c ? error_entry+0x7c/0xf0 ? async_page_fault+0x8/0x30 ? native_iret+0x7/0x7 ? int3+0xa/0x20 ? trace_hardirqs_on_thunk+0x1c/0x1c ? error_entry+0x7c/0xf0 ? int3+0xa/0x20 ? apic_timer_interrupt+0x1/0x20 </ENTRY_TRAMPOLINE> Kernel panic - not syncing: Machine halted. Kernel Offset: disabled ---[ end Kernel panic - not syncing: Machine halted. ]--- Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Andrea Righi <righi.andrea@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/154998796400.31052.8406236614820687840.stgit@devbox Signed-off-by: Ingo Molnar <mingo@kernel.org>		2019-02-13 08:16:39 +01:00
..
common.h	kprobes/x86: Don't call the ->break_handler() in x86 kprobes	2018-06-21 12:33:13 +02:00
core.c	x86/kprobes: Prohibit probing on IRQ handlers directly	2019-02-13 08:16:39 +01:00
ftrace.c	bpf/error-inject/kprobes: Clear current_kprobe and enable preempt in kprobe	2018-06-21 12:33:19 +02:00
Makefile
opt.c	x86/kprobes: Move trampoline code into RODATA	2019-02-13 08:16:39 +01:00