Re: [PATCH v13 bpf-next 0/1] fprobe: Introduce fprobe function entry/exit probe

Masami Hiramatsu
2022-03-23T05:43:07Z

Hi,

The title is not updated. It should be;

rethook: x86: Add rethook x86 porting (drived from "fprobe: Introduce fprobe function entry/exit probe" series)

Thank you,

On Wed, 23 Mar 2022 11:34:46 +0900
Masami Hiramatsu <mhiramat@kernel.org> wrote:

> Hi,
>
> Here is the 13th version of rethook x86 port. This is developed for a part
> of fprobe series [1] for hooking function return. But since I forgot to send
> it to arch maintainers, that caused conflict with IBT and SLS mitigation series.
> Now I picked the x86 rethook part and send it to x86 maintainers to be
> reviewed.
>
> [1] https://lore.kernel.org/all/164735281449.1084943.12438881786173547153.stgit@devnote2/T/#u
>
> Note that this patch is still for the bpf-next since the rethook itself
> is on the bpf-next tree. But since this also uses the ANNOTATE_NOENDBR
> macro which has been introduced by IBT/ENDBR patch, to build this series
> you need to merge the tip/master branch with the bpf-next.
> (hopefully, it is rebased soon)
>
> The fprobe itself is for providing the function entry/exit probe
> with multiple probe point. The rethook is a sub-feature to hook the
> function return as same as kretprobe does. Eventually, I would like
> to replace the kretprobe's trampoline with this rethook.
>
> Thank you,
>
> ---
>
> Masami Hiramatsu (1):
> rethook: x86: Add rethook x86 implementation
>
>
> arch/x86/Kconfig | 1
> arch/x86/include/asm/unwind.h | 8 ++-
> arch/x86/kernel/Makefile | 1
> arch/x86/kernel/kprobes/common.h | 1
> arch/x86/kernel/rethook.c | 121 ++++++++++++++++++++++++++++++++++++++
> 5 files changed, 131 insertions(+), 1 deletion(-)
> create mode 100644 arch/x86/kernel/rethook.c
>
> --
> Masami Hiramatsu (Linaro) <mhiramat@kernel.org>

--
Masami Hiramatsu <mhiramat@kernel.org>