33385150ac
Hook up the generic vDSO implementation to the x86 vDSO data page. Since the existing vDSO infrastructure is heavily based on the timekeeping functionality, which works over arrays of bases, a new macro is introduced for vvars that are not arrays. The vDSO function requires a ChaCha20 implementation that does not write to the stack, yet can still do an entire ChaCha20 permutation, so provide this using SSE2, since this is userland code that must work on all x86-64 processors. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Samuel Neves <sneves@dei.uc.pt> # for vgetrandom-chacha.S Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
17 lines
620 B
C
17 lines
620 B
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2022-2024 Jason A. Donenfeld <Jason@zx2c4.com>. All Rights Reserved.
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*/
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#include <linux/types.h>
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#include "../../../../lib/vdso/getrandom.c"
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ssize_t __vdso_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state, size_t opaque_len);
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ssize_t __vdso_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state, size_t opaque_len)
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{
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return __cvdso_getrandom(buffer, len, flags, opaque_state, opaque_len);
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}
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ssize_t getrandom(void *, size_t, unsigned int, void *, size_t)
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__attribute__((weak, alias("__vdso_getrandom")));
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