From patchwork Thu Jun 1 10:12:53 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mike Rapoport X-Patchwork-Id: 13263361 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 43C2EC7EE29 for ; Thu, 1 Jun 2023 10:15:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=soxEAnWf921WGEpBwb93R4Jax1uTNNcBC23qSorkam4=; b=0W1JM3zbgJPvxX XDA5AnetOXbiQ26ZYl7IJAvLLQmWjXE3E3kX6I2n4FpV2V79Uh+r09cb6wZflMSFtQG/vfP+7BsJV QbAXmtlV0P31HlyvQvK7N0EXPILZe/0Owpb7px5KhQM8TvIPdsMzMGrCFsQioMSuQXGOUWjo5t6QA uWjuc16dQN6HzQ7ktbFugdxnq5LetbGBHIjMdktNsPhUzOGt71zrkcKxNN8lftQxo42RaR3dS5uUQ 91qs/PHQiKqdoOILcCS3dXsGiivnZ3HUQnUCPZ+GYqfA6eDB1UjnOaaktpukeGQHss4C+nL2QclRm WtUz67fjEmWrBC8gg0VA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1q4fKM-002sq7-1W; Thu, 01 Jun 2023 10:14:42 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1q4fKI-002slm-2o; Thu, 01 Jun 2023 10:14:40 +0000 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 3A6B663EAA; Thu, 1 Jun 2023 10:14:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7C133C433EF; Thu, 1 Jun 2023 10:14:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1685614478; bh=RnI9kyc36R7EEC0EF5Knnbb7J1Oc8vlY/yhY3jroC/s=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=smB0mdPZDNWFwAFsCAwb5DAFagzvRAPK6rkjDKV0KuqusGMOYloR0np4kQBA5fOZE DuF2MiWRS01rW4nbJjsbx3Hc5ocUPSkCJxzaZHKrhr5hT4UiIFg6WhUEKnpjSiOB4C btfMce30g+4cPrkTqHJKVmXzpp6oSY2iG628dFMeRrr7N971OSdNECTmrkyl+GgPfz KJ+yOaQxeEWps9YCXFnSeYww1v2zotAZ/BwweTurhTFjcdSeiSzqPJvki3yRVxglei plYk2kbTT3J971PZwv8JAckptKMEPNNSnOhMyaOYkmZGqnNAusCuxyauY3sDufcq4C 3b1Acmo9lEOUA== From: Mike Rapoport To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Catalin Marinas , Christophe Leroy , "David S. Miller" , Dinh Nguyen , Heiko Carstens , Helge Deller , Huacai Chen , Kent Overstreet , Luis Chamberlain , Michael Ellerman , Mike Rapoport , "Naveen N. Rao" , Palmer Dabbelt , Russell King , Song Liu , Steven Rostedt , Thomas Bogendoerfer , Thomas Gleixner , Will Deacon , bpf@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org, linux-mm@kvack.org, linux-modules@vger.kernel.org, linux-parisc@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, loongarch@lists.linux.dev, netdev@vger.kernel.org, sparclinux@vger.kernel.org, x86@kernel.org Subject: [PATCH 09/13] kprobes: remove dependcy on CONFIG_MODULES Date: Thu, 1 Jun 2023 13:12:53 +0300 Message-Id: <20230601101257.530867-10-rppt@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20230601101257.530867-1-rppt@kernel.org> References: <20230601101257.530867-1-rppt@kernel.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230601_031439_012504_6DAA236E X-CRM114-Status: GOOD ( 18.99 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: "Mike Rapoport (IBM)" kprobes depended on CONFIG_MODULES because it has to allocate memory for code. Since code allocations are now implemented with jitalloc, kprobes can be enabled in non-modular kernels. Add #ifdef CONFIG_MODULE guars for the code dealing with kprobes inside modules, make CONFIG_KPROBES select CONFIG_JIT_ALLOC and drop the dependency of CONFIG_KPROBES on CONFIG_MODULES Signed-off-by: Mike Rapoport (IBM) --- arch/Kconfig | 2 +- kernel/kprobes.c | 43 +++++++++++++++++++++---------------- kernel/trace/trace_kprobe.c | 11 ++++++++++ 3 files changed, 37 insertions(+), 19 deletions(-) diff --git a/arch/Kconfig b/arch/Kconfig index 205fd23e0cad..479a7b8be191 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -39,9 +39,9 @@ config GENERIC_ENTRY config KPROBES bool "Kprobes" - depends on MODULES depends on HAVE_KPROBES select KALLSYMS + select JIT_ALLOC select TASKS_RCU if PREEMPTION help Kprobes allows you to trap at almost any kernel address and diff --git a/kernel/kprobes.c b/kernel/kprobes.c index 3caf3561c048..11c1cfbb11ae 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -1568,6 +1568,7 @@ static int check_kprobe_address_safe(struct kprobe *p, goto out; } +#ifdef CONFIG_MODULES /* Check if 'p' is probing a module. */ *probed_mod = __module_text_address((unsigned long) p->addr); if (*probed_mod) { @@ -1591,6 +1592,8 @@ static int check_kprobe_address_safe(struct kprobe *p, ret = -ENOENT; } } +#endif + out: preempt_enable(); jump_label_unlock(); @@ -2484,24 +2487,6 @@ int kprobe_add_area_blacklist(unsigned long start, unsigned long end) return 0; } -/* Remove all symbols in given area from kprobe blacklist */ -static void kprobe_remove_area_blacklist(unsigned long start, unsigned long end) -{ - struct kprobe_blacklist_entry *ent, *n; - - list_for_each_entry_safe(ent, n, &kprobe_blacklist, list) { - if (ent->start_addr < start || ent->start_addr >= end) - continue; - list_del(&ent->list); - kfree(ent); - } -} - -static void kprobe_remove_ksym_blacklist(unsigned long entry) -{ - kprobe_remove_area_blacklist(entry, entry + 1); -} - int __weak arch_kprobe_get_kallsym(unsigned int *symnum, unsigned long *value, char *type, char *sym) { @@ -2566,6 +2551,25 @@ static int __init populate_kprobe_blacklist(unsigned long *start, return ret ? : arch_populate_kprobe_blacklist(); } +#ifdef CONFIG_MODULES +/* Remove all symbols in given area from kprobe blacklist */ +static void kprobe_remove_area_blacklist(unsigned long start, unsigned long end) +{ + struct kprobe_blacklist_entry *ent, *n; + + list_for_each_entry_safe(ent, n, &kprobe_blacklist, list) { + if (ent->start_addr < start || ent->start_addr >= end) + continue; + list_del(&ent->list); + kfree(ent); + } +} + +static void kprobe_remove_ksym_blacklist(unsigned long entry) +{ + kprobe_remove_area_blacklist(entry, entry + 1); +} + static void add_module_kprobe_blacklist(struct module *mod) { unsigned long start, end; @@ -2667,6 +2671,7 @@ static struct notifier_block kprobe_module_nb = { .notifier_call = kprobes_module_callback, .priority = 0 }; +#endif void kprobe_free_init_mem(void) { @@ -2726,8 +2731,10 @@ static int __init init_kprobes(void) err = arch_init_kprobes(); if (!err) err = register_die_notifier(&kprobe_exceptions_nb); +#ifdef CONFIG_MODULES if (!err) err = register_module_notifier(&kprobe_module_nb); +#endif kprobes_initialized = (err == 0); kprobe_sysctls_init(); diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c index 59cda19a9033..cf804e372554 100644 --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -111,6 +111,7 @@ static nokprobe_inline bool trace_kprobe_within_module(struct trace_kprobe *tk, return strncmp(module_name(mod), name, len) == 0 && name[len] == ':'; } +#ifdef CONFIG_MODULES static nokprobe_inline bool trace_kprobe_module_exist(struct trace_kprobe *tk) { char *p; @@ -129,6 +130,12 @@ static nokprobe_inline bool trace_kprobe_module_exist(struct trace_kprobe *tk) return ret; } +#else +static inline bool trace_kprobe_module_exist(struct trace_kprobe *tk) +{ + return false; +} +#endif static bool trace_kprobe_is_busy(struct dyn_event *ev) { @@ -670,6 +677,7 @@ static int register_trace_kprobe(struct trace_kprobe *tk) return ret; } +#ifdef CONFIG_MODULES /* Module notifier call back, checking event on the module */ static int trace_kprobe_module_callback(struct notifier_block *nb, unsigned long val, void *data) @@ -704,6 +712,7 @@ static struct notifier_block trace_kprobe_module_nb = { .notifier_call = trace_kprobe_module_callback, .priority = 1 /* Invoked after kprobe module callback */ }; +#endif static int __trace_kprobe_create(int argc, const char *argv[]) { @@ -1797,8 +1806,10 @@ static __init int init_kprobe_trace_early(void) if (ret) return ret; +#ifdef CONFIG_MODULES if (register_module_notifier(&trace_kprobe_module_nb)) return -EINVAL; +#endif return 0; }