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Date: Wed, 13 Nov 2019 15:27:02 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Sami Tolvanen <samitolvanen@...gle.com>
Cc: Will Deacon <will@...nel.org>, Catalin Marinas
<catalin.marinas@....com>, Masami Hiramatsu <mhiramat@...nel.org>, Ard
Biesheuvel <ard.biesheuvel@...aro.org>, Dave Martin <Dave.Martin@....com>,
Kees Cook <keescook@...omium.org>, Laura Abbott <labbott@...hat.com>, Mark
Rutland <mark.rutland@....com>, Marc Zyngier <maz@...nel.org>, Nick
Desaulniers <ndesaulniers@...gle.com>, Jann Horn <jannh@...gle.com>, Miguel
Ojeda <miguel.ojeda.sandonis@...il.com>, Masahiro Yamada
<yamada.masahiro@...ionext.com>, clang-built-linux@...glegroups.com,
kernel-hardening@...ts.openwall.com, linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 08/17] kprobes: fix compilation without
CONFIG_KRETPROBES
On Fri, 1 Nov 2019 15:11:41 -0700
Sami Tolvanen <samitolvanen@...gle.com> wrote:
> kprobe_on_func_entry and arch_kprobe_on_func_entry need to be available
> even if CONFIG_KRETPROBES is not selected.
>
> Signed-off-by: Sami Tolvanen <samitolvanen@...gle.com>
> Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
> Reviewed-by: Kees Cook <keescook@...omium.org>
Acked-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
-- Steve
> ---
> kernel/kprobes.c | 38 +++++++++++++++++++-------------------
> 1 file changed, 19 insertions(+), 19 deletions(-)
>
> diff --git a/kernel/kprobes.c b/kernel/kprobes.c
> index 53534aa258a6..b5e20a4669b8 100644
> --- a/kernel/kprobes.c
> +++ b/kernel/kprobes.c
> @@ -1829,6 +1829,25 @@ unsigned long __weak arch_deref_entry_point(void *entry)
> return (unsigned long)entry;
> }
>
> +bool __weak arch_kprobe_on_func_entry(unsigned long offset)
> +{
> + return !offset;
> +}
> +
> +bool kprobe_on_func_entry(kprobe_opcode_t *addr, const char *sym, unsigned long offset)
> +{
> + kprobe_opcode_t *kp_addr = _kprobe_addr(addr, sym, offset);
> +
> + if (IS_ERR(kp_addr))
> + return false;
> +
> + if (!kallsyms_lookup_size_offset((unsigned long)kp_addr, NULL, &offset) ||
> + !arch_kprobe_on_func_entry(offset))
> + return false;
> +
> + return true;
> +}
> +
> #ifdef CONFIG_KRETPROBES
> /*
> * This kprobe pre_handler is registered with every kretprobe. When probe
> @@ -1885,25 +1904,6 @@ static int pre_handler_kretprobe(struct kprobe *p, struct pt_regs *regs)
> }
> NOKPROBE_SYMBOL(pre_handler_kretprobe);
>
> -bool __weak arch_kprobe_on_func_entry(unsigned long offset)
> -{
> - return !offset;
> -}
> -
> -bool kprobe_on_func_entry(kprobe_opcode_t *addr, const char *sym, unsigned long offset)
> -{
> - kprobe_opcode_t *kp_addr = _kprobe_addr(addr, sym, offset);
> -
> - if (IS_ERR(kp_addr))
> - return false;
> -
> - if (!kallsyms_lookup_size_offset((unsigned long)kp_addr, NULL, &offset) ||
> - !arch_kprobe_on_func_entry(offset))
> - return false;
> -
> - return true;
> -}
> -
> int register_kretprobe(struct kretprobe *rp)
> {
> int ret = 0;
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