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SubjectRe: [PATCH -tip v8 03/26] kprobes: Prohibit probing on .entry.text code
On Mon, 24 Mar 2014 10:48:02 +0900
Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> wrote:

> (2014/03/22 7:04), Steven Rostedt wrote:
> > On Wed, 05 Mar 2014 20:59:04 +0900
> > Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> wrote:
> >
> >
> >> struct kprobe_insn_cache {
> >> struct mutex mutex;
> >> diff --git a/kernel/kprobes.c b/kernel/kprobes.c
> >> index ceeadfc..5b5ac76 100644
> >> --- a/kernel/kprobes.c
> >> +++ b/kernel/kprobes.c
> >> @@ -96,9 +96,6 @@ static raw_spinlock_t *kretprobe_table_lock_ptr(unsigned long hash)
> >> static struct kprobe_blackpoint kprobe_blacklist[] = {
> >> {"preempt_schedule",},
> >> {"native_get_debugreg",},
> >> - {"irq_entries_start",},
> >> - {"common_interrupt",},
> >> - {"mcount",}, /* mcount can be called from everywhere */
> >
> > Is mcount in the entry.text section? Also, what about ftrace_caller and
> > friends.
>
> I saw mcount(and ftrace_caller) in arch/x86/kernel/entry_*.S, and
> almost all code in it are in ".entry.text" section as far as I can see,
> or do I miss something?
>

Ah, checking the System.map I guess we are OK.

-- Steve


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