diff options
| author | Jason A. Donenfeld <Jason@zx2c4.com> | 2022-03-01 20:22:39 +0100 |
|---|---|---|
| committer | Jason A. Donenfeld <Jason@zx2c4.com> | 2022-03-12 18:00:56 -0700 |
| commit | f3c2682bad7bc6033c837e9c66e5af881fe8d465 (patch) | |
| tree | f0101c73dee541fd4cd6e599e26f5e5b1195190e /include/linux/random.h | |
| parent | 5acd35487dc911541672b3ffc322851769c32a56 (diff) | |
random: provide notifier for VM fork
Drivers such as WireGuard need to learn when VMs fork in order to clear
sessions. This commit provides a simple notifier_block for that, with a
register and unregister function. When no VM fork detection is compiled
in, this turns into a no-op, similar to how the power notifier works.
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
Diffstat (limited to 'include/linux/random.h')
| -rw-r--r-- | include/linux/random.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/random.h b/include/linux/random.h index fab1ab0563b4..c0baffe7afb1 100644 --- a/include/linux/random.h +++ b/include/linux/random.h @@ -32,6 +32,11 @@ extern void add_hwgenerator_randomness(const void *buffer, size_t count, size_t entropy); #if IS_ENABLED(CONFIG_VMGENID) extern void add_vmfork_randomness(const void *unique_vm_id, size_t size); +extern int register_random_vmfork_notifier(struct notifier_block *nb); +extern int unregister_random_vmfork_notifier(struct notifier_block *nb); +#else +static inline int register_random_vmfork_notifier(struct notifier_block *nb) { return 0; } +static inline int unregister_random_vmfork_notifier(struct notifier_block *nb) { return 0; } #endif extern void get_random_bytes(void *buf, size_t nbytes); |