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authorJason A. Donenfeld <Jason@zx2c4.com>2022-03-01 20:03:49 +0100
committerJason A. Donenfeld <Jason@zx2c4.com>2022-03-13 02:00:56 +0100
commit5acd35487dc911541672b3ffc322851769c32a56 (patch)
treeea7d9e993383b44e483fcd44fc85df78222f8af8 /lib
parentrandom: do not export add_vmfork_randomness() unless needed (diff)
downloadlinux-5acd35487dc911541672b3ffc322851769c32a56.tar.xz
linux-5acd35487dc911541672b3ffc322851769c32a56.zip
random: replace custom notifier chain with standard one
We previously rolled our own randomness readiness notifier, which only has two users in the whole kernel. Replace this with a more standard atomic notifier block that serves the same purpose with less code. Also unexport the symbols, because no modules use it, only unconditional builtins. The only drawback is that it's possible for a notification handler returning the "stop" code to prevent further processing, but given that there are only two users, and that we're unexporting this anyway, that doesn't seem like a significant drawback for the simplification we receive here. Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Dominik Brodowski <linux@dominikbrodowski.net> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Diffstat (limited to 'lib')
-rw-r--r--lib/random32.c12
-rw-r--r--lib/vsprintf.c10
2 files changed, 13 insertions, 9 deletions
diff --git a/lib/random32.c b/lib/random32.c
index 3c19820796d0..976632003ec6 100644
--- a/lib/random32.c
+++ b/lib/random32.c
@@ -551,9 +551,11 @@ static void prandom_reseed(struct timer_list *unused)
* To avoid worrying about whether it's safe to delay that interrupt
* long enough to seed all CPUs, just schedule an immediate timer event.
*/
-static void prandom_timer_start(struct random_ready_callback *unused)
+static int prandom_timer_start(struct notifier_block *nb,
+ unsigned long action, void *data)
{
mod_timer(&seed_timer, jiffies);
+ return 0;
}
#ifdef CONFIG_RANDOM32_SELFTEST
@@ -617,13 +619,13 @@ core_initcall(prandom32_state_selftest);
*/
static int __init prandom_init_late(void)
{
- static struct random_ready_callback random_ready = {
- .func = prandom_timer_start
+ static struct notifier_block random_ready = {
+ .notifier_call = prandom_timer_start
};
- int ret = add_random_ready_callback(&random_ready);
+ int ret = register_random_ready_notifier(&random_ready);
if (ret == -EALREADY) {
- prandom_timer_start(&random_ready);
+ prandom_timer_start(&random_ready, 0, NULL);
ret = 0;
}
return ret;
diff --git a/lib/vsprintf.c b/lib/vsprintf.c
index 3b8129dd374c..36574a806a81 100644
--- a/lib/vsprintf.c
+++ b/lib/vsprintf.c
@@ -757,14 +757,16 @@ static void enable_ptr_key_workfn(struct work_struct *work)
static DECLARE_WORK(enable_ptr_key_work, enable_ptr_key_workfn);
-static void fill_random_ptr_key(struct random_ready_callback *unused)
+static int fill_random_ptr_key(struct notifier_block *nb,
+ unsigned long action, void *data)
{
/* This may be in an interrupt handler. */
queue_work(system_unbound_wq, &enable_ptr_key_work);
+ return 0;
}
-static struct random_ready_callback random_ready = {
- .func = fill_random_ptr_key
+static struct notifier_block random_ready = {
+ .notifier_call = fill_random_ptr_key
};
static int __init initialize_ptr_random(void)
@@ -778,7 +780,7 @@ static int __init initialize_ptr_random(void)
return 0;
}
- ret = add_random_ready_callback(&random_ready);
+ ret = register_random_ready_notifier(&random_ready);
if (!ret) {
return 0;
} else if (ret == -EALREADY) {