diff options
Diffstat (limited to 'include/vdso/getrandom.h')
| -rw-r--r-- | include/vdso/getrandom.h | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/include/vdso/getrandom.h b/include/vdso/getrandom.h index a8b7c14b0ae0..4cf02e678f5e 100644 --- a/include/vdso/getrandom.h +++ b/include/vdso/getrandom.h @@ -43,4 +43,17 @@ struct vgetrandom_state { bool in_use; }; +/** + * __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 /* _VDSO_GETRANDOM_H */ |