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Date: Thu, 31 Oct 2019 20:55:25 -0700
From: Kees Cook <keescook@...omium.org>
To: samitolvanen@...gle.com
Cc: Will Deacon <will@...nel.org>,
Catalin Marinas <catalin.marinas@....com>,
Steven Rostedt <rostedt@...dmis.org>,
Masami Hiramatsu <mhiramat@...nel.org>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Dave Martin <Dave.Martin@....com>,
Laura Abbott <labbott@...hat.com>,
Mark Rutland <mark.rutland@....com>,
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 v3 08/17] kprobes: fix compilation without
CONFIG_KRETPROBES
On Thu, Oct 31, 2019 at 09:46:28AM -0700, 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>
FWIW:
Reviewed-by: Kees Cook <keescook@...omium.org>
-Kees
> Acked-by: Masami Hiramatsu <mhiramat@...nel.org>
> ---
> 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;
> --
> 2.24.0.rc0.303.g954a862665-goog
>
--
Kees Cook
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