/* SPDX-License-Identifier: GPL-2.0 */ /* * Copyright (C) 2022-2024 Jason A. Donenfeld <[email protected]>. All Rights Reserved. */ #ifndef __ASM_VDSO_GETRANDOM_H #define __ASM_VDSO_GETRANDOM_H #ifndef __ASSEMBLY__ #include <asm/unistd.h> #include <asm/vvar.h> /** * getrandom_syscall - Invoke the getrandom() syscall. * @buffer: Destination buffer to fill with random bytes. * @len: Size of @buffer in bytes. * @flags: Zero or more GRND_* flags. * Returns: The number of random bytes written to @buffer, or a negative value indicating an error. */ static __always_inline ssize_t getrandom_syscall(void *buffer, size_t len, unsigned int flags) { … } #define __vdso_rng_data … static __always_inline const struct vdso_rng_data *__arch_get_vdso_rng_data(void) { … } /** * __arch_chacha20_blocks_nostack - Generate ChaCha20 stream without using the stack. * @dst_bytes: Destination buffer to hold @nblocks * 64 bytes of output. * @key: 32-byte input key. * @counter: 8-byte counter, read on input and updated on return. * @nblocks: Number of blocks to generate. * * Generates a given positive number of blocks of ChaCha20 output with nonce=0, and does not write * to any stack or memory outside of the parameters passed to it, in order to mitigate stack data * leaking into forked child processes. */ extern void __arch_chacha20_blocks_nostack(u8 *dst_bytes, const u32 *key, u32 *counter, size_t nblocks); #endif /* !__ASSEMBLY__ */ #endif /* __ASM_VDSO_GETRANDOM_H */
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