linux-kernel - [PATCH v1 09/12] netoops: Add an interface to trigger various types of crashes.

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Date:	Tue, 02 Nov 2010 18:30:19 -0700
From:	Mike Waychison <mikew@...gle.com>
To:	simon.kagstrom@...insight.net, davem@...emloft.net
Cc:	adurbin@...gle.com, akpm@...ux-foundation.org, chavey@...gle.com,
	linux-kernel@...r.kernel.org, linux-api@...r.kernel.org
Subject: [PATCH v1 09/12] netoops: Add an interface to trigger various types
	of crashes.

It is very useful to be able to test the crash path, but in order to do so, we
need to expose various ways to crash the kernel in a deterministic fashion.

This commit adds a file, /proc/sys/kernel/net_dump_now that takes various
tokens that will crash the kernel in various ways.

Signed-off-by: Mike Waychison <mikew@...gle.com>
---

This trigger is probably better done using an ABI that is much more generic.
It could perhaps be an extension of /proc/sysrq-trigger, though it would be
nice to have the 'types' of crashes enumerated in a programmable manner somehow
to know if they are available or not.
---
 drivers/net/netoops.c |   31 +++++++++++++++++++++++++++++++
 1 files changed, 31 insertions(+), 0 deletions(-)

diff --git a/drivers/net/netoops.c b/drivers/net/netoops.c
index 01432d7..87b2122 100644
--- a/drivers/net/netoops.c
+++ b/drivers/net/netoops.c
@@ -578,6 +578,32 @@ static int proc_netoops_device(struct ctl_table *table, int write,
 	return 0;
 }
 
+static int proc_netoops_now(struct ctl_table *table, int write,
+			    void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+	if (write) {
+		char magic[20];
+		/* just crash in kernel mode. */
+		if (copy_from_user(magic, buffer, min(*lenp, sizeof(magic))))
+			return -EFAULT;
+		magic[min(*lenp, sizeof(magic))-1] = 0;
+		if (!strcmp(magic, "elgooG")) {
+			/* Test a simple crash */
+			*(unsigned long *)0 = 0;
+		} else if (!strcmp(magic, "guB")) {
+			/* Test the BUG() handler */
+			BUG();
+		} else if (!strcmp(magic, "cinaP")) {
+			panic("Testing panic");
+		} else if (!strcmp(magic, "pmuD")) {
+			kmsg_dump(KMSG_DUMP_SOFT, NULL);
+		}
+		return 0;
+	}
+	*lenp = 0;
+	return 0;
+}
+
 static struct ctl_table kern_table[] = {
 	{
 		.procname       = "net_dump_device",
@@ -585,6 +611,11 @@ static struct ctl_table kern_table[] = {
 		.proc_handler   = &proc_netoops_device,
 	},
 	{
+		.procname       = "net_dump_now",
+		.mode           = 0600,
+		.proc_handler   = &proc_netoops_now,
+	},
+	{
 		.procname       = "net_dump_one_shot",
 		.data           = &network_dumper_one_shot,
 		.maxlen         = sizeof(int),

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