lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Mon, 09 Dec 2013 10:47:53 +0000
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-arch@...r.kernel.org,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Sandeepa Prabhu <sandeepa.prabhu@...aro.org>, x86@...nel.org,
	lkml <linux-kernel@...r.kernel.org>,
	"Steven Rostedt (Red Hat)" <rostedt@...dmis.org>,
	systemtap@...rceware.org, "David S. Miller" <davem@...emloft.net>
Subject: [PATCH -tip v5 15/18] kprobes: Show blacklist entries via debugfs

Show blacklist entries (function names with the address
range) via /sys/kernel/debug/kprobes/blacklist.

Changes from previous version:
 - Use %ps for showing blacklist symbols.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>
Cc: "David S. Miller" <davem@...emloft.net>
---
 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);


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists