From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161132AbaDQITB (ORCPT ); Thu, 17 Apr 2014 04:19:01 -0400 Received: from mail9.hitachi.co.jp ([133.145.228.44]:37160 "EHLO mail9.hitachi.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755740AbaDQIS5 (ORCPT ); Thu, 17 Apr 2014 04:18:57 -0400 Subject: [PATCH -tip v9 19/26] kprobes: Show blacklist entries via debugfs From: Masami Hiramatsu To: linux-kernel@vger.kernel.org, Ingo Molnar Cc: Andi Kleen , Ananth N Mavinakayanahalli , Sandeepa Prabhu , Frederic Weisbecker , x86@kernel.org, Steven Rostedt , fche@redhat.com, mingo@redhat.com, systemtap@sourceware.org, "H. Peter Anvin" , Thomas Gleixner , "David S. Miller" Date: Thu, 17 Apr 2014 17:18:49 +0900 Message-ID: <20140417081849.26341.11609.stgit@ltc230.yrl.intra.hitachi.co.jp> In-Reply-To: <20140417081636.26341.87858.stgit@ltc230.yrl.intra.hitachi.co.jp> References: <20140417081636.26341.87858.stgit@ltc230.yrl.intra.hitachi.co.jp> User-Agent: StGit/0.17-dirty MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Show blacklist entries (function names with the address range) via /sys/kernel/debug/kprobes/blacklist. Note that at this point the blacklist supports only in vmlinux, not module. So the list is fixed and not updated. Signed-off-by: Masami Hiramatsu Cc: Ananth N Mavinakayanahalli Cc: "David S. Miller" --- kernel/kprobes.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 53 insertions(+), 8 deletions(-) diff --git a/kernel/kprobes.c b/kernel/kprobes.c index a21b4e6..3214289 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -2249,6 +2249,46 @@ static const struct file_operations debugfs_kprobes_operations = { .release = seq_release, }; +/* kprobes/blacklist -- shows which functions can not be probed */ +static void *kprobe_blacklist_seq_start(struct seq_file *m, loff_t *pos) +{ + return seq_list_start(&kprobe_blacklist, *pos); +} + +static void *kprobe_blacklist_seq_next(struct seq_file *m, void *v, loff_t *pos) +{ + return seq_list_next(v, &kprobe_blacklist, pos); +} + +static int kprobe_blacklist_seq_show(struct seq_file *m, void *v) +{ + struct kprobe_blacklist_entry *ent = + list_entry(v, struct kprobe_blacklist_entry, list); + + seq_printf(m, "0x%p-0x%p\t%ps\n", (void *)ent->start_addr, + (void *)ent->end_addr, (void *)ent->start_addr); + return 0; +} + +static const struct seq_operations kprobe_blacklist_seq_ops = { + .start = kprobe_blacklist_seq_start, + .next = kprobe_blacklist_seq_next, + .stop = kprobe_seq_stop, /* Reuse void function */ + .show = kprobe_blacklist_seq_show, +}; + +static int kprobe_blacklist_open(struct inode *inode, struct file *filp) +{ + return seq_open(filp, &kprobe_blacklist_seq_ops); +} + +static const struct file_operations debugfs_kprobe_blacklist_ops = { + .open = kprobe_blacklist_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release, +}; + static void arm_all_kprobes(void) { struct hlist_head *head; @@ -2372,19 +2412,24 @@ static int __init debugfs_kprobe_init(void) file = debugfs_create_file("list", 0444, dir, NULL, &debugfs_kprobes_operations); - if (!file) { - debugfs_remove(dir); - return -ENOMEM; - } + if (!file) + goto error; file = debugfs_create_file("enabled", 0600, dir, &value, &fops_kp); - if (!file) { - debugfs_remove(dir); - return -ENOMEM; - } + if (!file) + goto error; + + file = debugfs_create_file("blacklist", 0444, dir, NULL, + &debugfs_kprobe_blacklist_ops); + if (!file) + goto error; return 0; + +error: + debugfs_remove(dir); + return -ENOMEM; } late_initcall(debugfs_kprobe_init);