From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261803AbVAMX3i (ORCPT ); Thu, 13 Jan 2005 18:29:38 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261779AbVAMX1h (ORCPT ); Thu, 13 Jan 2005 18:27:37 -0500 Received: from smtp1.libero.it ([193.70.192.51]:61341 "EHLO smtp1.libero.it") by vger.kernel.org with ESMTP id S261778AbVAMXWZ (ORCPT ); Thu, 13 Jan 2005 18:22:25 -0500 Message-ID: <41E70234.50900@gmail.com> Date: Fri, 14 Jan 2005 00:20:20 +0100 From: Luca Falavigna User-Agent: Mozilla Thunderbird 1.0 (X11/20041206) X-Accept-Language: it, it-it, en-us, en MIME-Version: 1.0 To: vamsi_krishna@in.ibm.com, prasanna@in.ibm.com CC: Greg KH , Nathan Lynch , suparna@in.ibm.com, lkml Subject: Re: [PATCH] Kprobes /proc entry References: <41E2AC82.8020909@gmail.com> <20050110181445.GA31209@kroah.com> <1105479077.17592.8.camel@pants.austin.ibm.com> <20050111213400.GB18422@kroah.com> In-Reply-To: <20050111213400.GB18422@kroah.com> X-Enigmail-Version: 0.89.5.0 X-Enigmail-Supports: pgp-inline, pgp-mime Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Voilà! Here is kprobes debug patch via debugfs. - --- ./kernel/kprobes.c 2005-01-13 20:41:11.000000000 +0100 +++ ./kernel/kprobes.c 2005-01-13 20:39:27.000000000 +0100 @@ -33,6 +33,9 @@ #include #include #include +#include +#include +#include #include #include #include @@ -131,6 +134,96 @@ unregister_kprobe(&jp->kp); } +#ifdef CONFIG_DEBUG_FS +int kprobes_open(struct inode *inode, struct file *file) +{ + try_module_get(THIS_MODULE); + return 0; +} + +int kprobes_release(struct inode *inode, struct file *file) +{ + module_put(THIS_MODULE); + return 0; +} + +void kprobes_list_info(struct kprobe *k, char *p) +{ + ssize_t len = 0; + char *module, namebuf[KSYM_NAME_LEN+1]; + const char *hook, *func; + unsigned long off, size, handler, addr = (unsigned long)k->addr; + + if(k->pre_handler) { + handler = (unsigned long)k->pre_handler; + func = kallsyms_lookup(addr, &size, &off, &module, namebuf); + len += sprintf(p + len, "PRE\t0x%lx(%s+%#lx)\t", + addr, func, off); + hook = kallsyms_lookup(handler, &size, &off, &module, namebuf); + len += sprintf(p + len, "0x%lx(%s)\t%s\n", handler, hook, + strlen(module) ? module : "[built-in]"); + } + if(k->post_handler) { + handler = (unsigned long)k->post_handler; + func = kallsyms_lookup(addr, &size, &off, &module, namebuf); + len += sprintf(p + len, "POST\t0x%lx(%s+%#lx)\t", + addr, func, off); + hook = kallsyms_lookup(handler, &size, &off, &module, namebuf); + len += sprintf(p + len, "0x%lx(%s)\t%s\n", handler, hook, + strlen(module) ? module : "[built-in]"); + } + if(k->fault_handler) { + handler = (unsigned long)k->fault_handler; + func = kallsyms_lookup(addr, &size, &off, &module, namebuf); + len += sprintf(p + len, "FAULT\t0x%lx(%s+%#lx)\t", + addr, func, off); + hook = kallsyms_lookup(handler, &size, &off, &module, namebuf); + len += sprintf(p + len, "0x%lx(%s)\t%s\n", handler, hook, + strlen(module) ? module : "[built-in]"); + } + if(k->break_handler) { + handler = (unsigned long)k->break_handler; + func = kallsyms_lookup(addr, &size, &off, &module, namebuf); + len += sprintf(p + len, "BREAK\t0x%lx(%s+%#lx)\t", + addr, func, off); + hook = kallsyms_lookup(handler, &size, &off, &module, namebuf); + len += sprintf(p + len, "0x%lx(%s)\t%s\n", handler, hook, + strlen(module) ? module : "[built-in]"); + } +} + +ssize_t kprobes_read(struct file *file, char __user *buf, + size_t size, loff_t *off) +{ + int i; + char *data = ""; + ssize_t len = 0; + struct hlist_head *head; + struct hlist_node *node; + struct kprobe *k; + + spin_lock(&kprobe_lock); + for(i = 0; i < KPROBE_TABLE_SIZE; i++) { + head = &kprobe_table[i]; + hlist_for_each(node, head) { + if((k = hlist_entry(node, struct kprobe, hlist))) { + kprobes_list_info(k, data + len); + len = strlen(data); + } + } + } + spin_unlock(&kprobe_lock); + return simple_read_from_buffer(buf, size, off, data, len); +} + +struct dentry *kprobes_dir, *kprobes_list; +struct file_operations kprobes_fops = { + .open = kprobes_open, + .read = kprobes_read, + .release = kprobes_release + }; +#endif + static int __init init_kprobes(void) { int i, err = 0; @@ -140,6 +233,16 @@ for (i = 0; i < KPROBE_TABLE_SIZE; i++) INIT_HLIST_HEAD(&kprobe_table[i]); +#ifdef CONFIG_DEBUG_FS + if(!(kprobes_dir = debugfs_create_dir("kprobes", NULL))) + return -ENODEV; + if(!(kprobes_list = debugfs_create_file("list", S_IRUGO, kprobes_dir, + NULL, &kprobes_fops))) { + debugfs_remove(kprobes_dir); + return -ENODEV; + } +#endif + err = register_die_notifier(&kprobe_exceptions_nb); return err; Signed-off-by: Luca Falavigna Regards, Luca -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.4 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org iQEVAwUBQecCMxZrwl7j21nOAQKEawf/csjjWfFF/UlsN5qZQ3QyYJ1lTSSvuKnh 5ttGdB0hI3Qra+CIR6A/2qhUVomNTV4fcf80R6pMqOmUY61FmYFx2Mv6cRs4fqK3 BoLlOYYAKv3x5dgePdmI3n5ENss3UUYfTG5zd5ng3Qo2IqjwI/L2CR/CM1peXRV1 EXjhTmwU78c+0PLYHPwglDxawfkDO62AyMGqcytg0wFnDDfhjbIHrt48ynl6EIwL oPvxQteQYSp15hRxAQbMRDz/1mzlhNMXZX6dKE15XrE31mk5P/iEaNadInv5r4DU 1ZFEpV0nKuJkmxSA4nVJHtLO7R+lqzkmFBmTBn9HT6Mh0U76aryixA== =zQ7Z -----END PGP SIGNATURE-----