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SubjectRe: [PATCH v2 4/4] arm64: kprobes: Use arch_populate_kprobe_blacklist()
On Fri, 8 Feb 2019 09:15:19 +0000
Will Deacon <will.deacon@arm.com> wrote:

> Hi Masami,
>
> On Mon, Jan 21, 2019 at 10:25:58PM +0900, Masami Hiramatsu wrote:
> > On Mon, 21 Jan 2019 12:20:07 +0000
> > James Morse <james.morse@arm.com> wrote:
> > > On 15/01/2019 06:25, Masami Hiramatsu wrote:
> > > > Use arch_populate_kprobe_blacklist() instead of
> > > > arch_within_kprobe_blacklist() so that we can see the full
> > > > blacklisted symbols under the debugfs.
> > > > diff --git a/arch/arm64/kernel/probes/kprobes.c b/arch/arm64/kernel/probes/kprobes.c
> > > > index b9e9758b6534..6c066c34c8a4 100644
> > > > --- a/arch/arm64/kernel/probes/kprobes.c
> > > > +++ b/arch/arm64/kernel/probes/kprobes.c
> > > > @@ -465,26 +465,30 @@ kprobe_breakpoint_handler(struct pt_regs *regs, unsigned int esr)
> > > > return DBG_HOOK_HANDLED;
> > > > }
> > > >
> > > > -bool arch_within_kprobe_blacklist(unsigned long addr)
> > > > +int __init arch_populate_kprobe_blacklist(void)
> > > > {
> > > > - if ((addr >= (unsigned long)__kprobes_text_start &&
> > > > - addr < (unsigned long)__kprobes_text_end) ||
> > > > - (addr >= (unsigned long)__entry_text_start &&
> > > > - addr < (unsigned long)__entry_text_end) ||
> > > > - (addr >= (unsigned long)__idmap_text_start &&
> > > > - addr < (unsigned long)__idmap_text_end) ||
> > >
> > > > - in_exception_text(addr))
> > >
> > > You added this one in the previous patch, but it disappears here.
> >
> > Yes, it is easy to explain how we transcribe from
> > arch_within_kprobe_blacklist() to arch_populate_kprobe_blacklist().
> >
> > >
> > >
> > > > - return true;
> > > > -
> > > > - if (!is_kernel_in_hyp_mode()) {
> > > > - if ((addr >= (unsigned long)__hyp_text_start &&
> > > > - addr < (unsigned long)__hyp_text_end) ||
> > > > - (addr >= (unsigned long)__hyp_idmap_text_start &&
> > > > - addr < (unsigned long)__hyp_idmap_text_end))
> > > > - return true;
> > > > - }
> > > > -
> > > > - return false;
> > > > + int ret;
> > >
> > >
> > > > + ret = kprobe_add_area_blacklist((unsigned long)__kprobes_text_start,
> > > > + (unsigned long)__kprobes_text_end);
> > > > + if (ret)
> > > > + return ret;
> > >
> > > Now that we have arch_populate_kprobe_blacklist(), does the arch-code need to
> > > blacklist the kprobes section itself?
> >
> > Ah, good catch! No, we don't need it here. Sorry I worked on older patch.
> > I'll update it.
>
> Did you send a new version of this series? I can't seem to spot it in my
> inbox.

Ah, OK. I just waited for James' patch series,

https://patchwork.kernel.org/cover/10779489/

Are those merged? I'd like to move this series on that.

Thank you for ping! :)


--
Masami Hiramatsu <mhiramat@kernel.org>

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