diff --git a/MAINTAINERS b/MAINTAINERS
index 843dd6a49538..e0aa33f54c57 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -17287,6 +17287,7 @@ T:	git https://git.kernel.org/pub/scm/linux/kernel/git/crng/random.git
 S:	Maintained
 F:	drivers/char/random.c
 F:	drivers/virt/vmgenid.c
+F:	lib/vdso/getrandom.c
 F:	lib/vdso/getrandom.h
 
 RAPIDIO SUBSYSTEM
diff --git a/drivers/char/random.c b/drivers/char/random.c
index 9b64db52849f..5b51e1cb0fcf 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -61,6 +61,9 @@
 #include <asm/irq.h>
 #include <asm/irq_regs.h>
 #include <asm/io.h>
+#ifdef CONFIG_HAVE_VDSO_GETRANDOM
+#include <vdso/datapage.h>
+#endif
 #include "../../lib/vdso/getrandom.h"
 
 /*********************************************************************
@@ -307,6 +310,9 @@ static void crng_reseed(struct work_struct *work)
 	if (next_gen == ULONG_MAX)
 		++next_gen;
 	WRITE_ONCE(base_crng.generation, next_gen);
+#ifdef CONFIG_HAVE_VDSO_GETRANDOM
+	smp_store_release(&_vdso_rng_data.generation, next_gen + 1);
+#endif
 	if (!static_branch_likely(&crng_is_ready))
 		crng_init = CRNG_READY;
 	spin_unlock_irqrestore(&base_crng.lock, flags);
@@ -756,6 +762,9 @@ static void __cold _credit_init_bits(size_t bits)
 		crng_reseed(NULL); /* Sets crng_init to CRNG_READY under base_crng.lock. */
 		if (static_key_initialized)
 			execute_in_process_context(crng_set_ready, &set_ready);
+#ifdef CONFIG_HAVE_VDSO_GETRANDOM
+		smp_store_release(&_vdso_rng_data.is_ready, true);
+#endif
 		wake_up_interruptible(&crng_init_wait);
 		kill_fasync(&fasync, SIGIO, POLL_IN);
 		pr_notice("crng init done\n");
diff --git a/include/vdso/datapage.h b/include/vdso/datapage.h
index 73eb622e7663..cbacfd923a5c 100644
--- a/include/vdso/datapage.h
+++ b/include/vdso/datapage.h
@@ -109,6 +109,11 @@ struct vdso_data {
 	struct arch_vdso_data	arch_data;
 };
 
+struct vdso_rng_data {
+	unsigned long generation;
+	bool is_ready;
+};
+
 /*
  * We use the hidden visibility to prevent the compiler from generating a GOT
  * relocation. Not only is going through a GOT useless (the entry couldn't and
@@ -120,6 +125,7 @@ struct vdso_data {
  */
 extern struct vdso_data _vdso_data[CS_BASES] __attribute__((visibility("hidden")));
 extern struct vdso_data _timens_data[CS_BASES] __attribute__((visibility("hidden")));
+extern struct vdso_rng_data _vdso_rng_data __attribute__((visibility("hidden")));
 
 /*
  * The generic vDSO implementation requires that gettimeofday.h
diff --git a/lib/vdso/Kconfig b/lib/vdso/Kconfig
index d883ac299508..c35fac664574 100644
--- a/lib/vdso/Kconfig
+++ b/lib/vdso/Kconfig
@@ -30,4 +30,9 @@ config GENERIC_VDSO_TIME_NS
 	  Selected by architectures which support time namespaces in the
 	  VDSO
 
+config HAVE_VDSO_GETRANDOM
+	bool
+	help
+	  Selected by architectures that support vDSO getrandom().
+
 endif
diff --git a/lib/vdso/getrandom.c b/lib/vdso/getrandom.c
new file mode 100644
index 000000000000..da5ad9b193b2
--- /dev/null
+++ b/lib/vdso/getrandom.c
@@ -0,0 +1,113 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2022 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
+ */
+
+#include <linux/kernel.h>
+#include <linux/atomic.h>
+#include <linux/fs.h>
+#include <vdso/datapage.h>
+#include <asm/vdso/getrandom.h>
+#include <asm/vdso/vsyscall.h>
+#include "getrandom.h"
+
+static void memcpy_and_zero(void *dst, void *src, size_t len)
+{
+#define CASCADE(type) \
+	while (len >= sizeof(type)) { \
+		__put_unaligned_t(type, __get_unaligned_t(type, src), dst); \
+		__put_unaligned_t(type, 0, src); \
+		dst += sizeof(type); \
+		src += sizeof(type); \
+		len -= sizeof(type); \
+	}
+#if IS_ENABLED(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
+#if BITS_PER_LONG == 64
+	CASCADE(u64);
+#endif
+	CASCADE(u32);
+	CASCADE(u16);
+#endif
+	CASCADE(u8);
+#undef CASCADE
+}
+
+static __always_inline ssize_t
+__cvdso_getrandom_data(const struct vdso_rng_data *rng_info, void *buffer, size_t len,
+		       unsigned int flags, void *opaque_state)
+{
+	ssize_t ret = min_t(size_t, MAX_RW_COUNT, len);
+	struct vgetrandom_state *state = opaque_state;
+	unsigned long current_generation;
+	void *orig_buffer = buffer;
+	size_t orig_len = len;
+	u32 counter[2] = { 0 };
+	size_t batch_len, nblocks;
+
+	/*
+	 * If the kernel isn't yet initialized, then the various flags might have some effect
+	 * that we can't emulate in userspace, so use the syscall.  Otherwise, the flags have
+	 * no effect, and can continue.
+	 */
+	if (unlikely(!rng_info->is_ready))
+		return getrandom_syscall(orig_buffer, orig_len, flags);
+
+	if (unlikely(!len))
+		return 0;
+
+retry_generation:
+	current_generation = READ_ONCE(rng_info->generation);
+	if (unlikely(state->generation != current_generation)) {
+		/* Write the generation before filling the key, in case there's a fork before. */
+		WRITE_ONCE(state->generation, current_generation);
+		/* If the generation is wrong, the kernel has reseeded, so we should too. */
+		if (getrandom_syscall(state->key, sizeof(state->key), 0) != sizeof(state->key))
+			return getrandom_syscall(orig_buffer, orig_len, flags);
+		/* Set state->pos so that the batch is considered emptied. */
+		state->pos = sizeof(state->batch);
+	}
+
+	len = ret;
+more_batch:
+	/* First use whatever is left from the last call. */
+	batch_len = min_t(size_t, sizeof(state->batch) - state->pos, len);
+	if (batch_len) {
+		/* Zero out bytes as they're copied out, to preserve forward secrecy. */
+		memcpy_and_zero(buffer, state->batch + state->pos, batch_len);
+		state->pos += batch_len;
+		buffer += batch_len;
+		len -= batch_len;
+	}
+	if (!len) {
+		/*
+		 * Since rng_info->generation will never be 0, we re-read state->generation,
+		 * rather than using the local current_generation variable, to learn whether
+		 * we forked. Primarily, though, this indicates whether the rng itself has
+		 * reseeded, in which case we should generate a new key and start over.
+		 */
+		if (unlikely(READ_ONCE(state->generation) != READ_ONCE(rng_info->generation))) {
+			buffer = orig_buffer;
+			goto retry_generation;
+		}
+		return ret;
+	}
+
+	/* Generate blocks of rng output directly into the buffer while there's enough left. */
+	nblocks = len / CHACHA_BLOCK_SIZE;
+	if (nblocks) {
+		__arch_chacha20_blocks_nostack(buffer, state->key, counter, nblocks);
+		buffer += nblocks * CHACHA_BLOCK_SIZE;
+		len -= nblocks * CHACHA_BLOCK_SIZE;
+	}
+
+	/* Refill the batch and then overwrite the key, in order to preserve forward secrecy. */
+	__arch_chacha20_blocks_nostack(state->batch_key, state->key, counter, 2);
+	state->pos = 0;
+	goto more_batch;
+}
+
+static __always_inline ssize_t
+__cvdso_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state)
+{
+	return __cvdso_getrandom_data(__arch_get_vdso_rng_data(), buffer, len, flags, opaque_state);
+}
