linux-kernel - [PATCH v4 08/17] kprobes: fix compilation without CONFIG

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Date:   Fri,  1 Nov 2019 15:11:41 -0700
From:   Sami Tolvanen <samitolvanen@...gle.com>
To:     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>
Cc:     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,
        Sami Tolvanen <samitolvanen@...gle.com>
Subject: [PATCH v4 08/17] kprobes: fix compilation without CONFIG_KRETPROBES

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>
---
 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.rc1.363.gb1bccd3e3d-goog