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Message-Id: <20140428195913.E0A0143994596@oldenburg.str.redhat.com>
Date: Mon, 28 Apr 2014 21:52:11 +0200
From: Florian Weimer <fweimer@...hat.com>
To: "Theodore Ts'o" <tytso@....edu>, linux-kernel@...r.kernel.org
Subject: [PATCH] random: Add "initialized" variable to proc
Before this change, you had to check kernel log messages to see if the
non-blocking pool had been properly initialized. With this change, you
can consult the file /proc/sys/kernel/random/intialized instead.
Signed-off-by: Florian Weimer <fweimer@...hat.com>
---
drivers/char/random.c | 19 +++++++++++++++++++
1 file changed, 19 insertions(+)
diff --git a/drivers/char/random.c b/drivers/char/random.c
index 6b75713..81d83e2 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1592,6 +1592,19 @@ static int proc_do_entropy(ctl_table *table, int write,
return proc_dointvec(&fake_table, write, buffer, lenp, ppos);
}
+/*
+ * Return whether the urandom pool has been initialized.
+ */
+static int proc_do_initialized(ctl_table *table, int write,
+ void __user *buffer, size_t *lenp, loff_t *ppos)
+{
+ ctl_table fake_table;
+ char ch = '0' + nonblocking_pool.initialized;
+ fake_table.data = &ch;
+ fake_table.maxlen = 1;
+ return proc_dostring(&fake_table, write, buffer, lenp, ppos);
+}
+
static int sysctl_poolsize = INPUT_POOL_WORDS * 32;
extern struct ctl_table random_table[];
struct ctl_table random_table[] = {
@@ -1610,6 +1623,12 @@ struct ctl_table random_table[] = {
.data = &input_pool.entropy_count,
},
{
+ .procname = "initialized",
+ .maxlen = 1,
+ .mode = 0444,
+ .proc_handler = proc_do_initialized,
+ },
+ {
.procname = "read_wakeup_threshold",
.data = &random_read_wakeup_bits,
.maxlen = sizeof(int),
--
1.9.0
--
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