41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_VDSO_GETRANDOM_H
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#define __ASM_VDSO_GETRANDOM_H
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#ifndef __ASSEMBLY__
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#include <vdso/datapage.h>
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#include <asm/vdso/vsyscall.h>
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#include <asm/syscall.h>
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#include <asm/unistd.h>
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#include <asm/page.h>
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/**
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* getrandom_syscall - Invoke the getrandom() syscall.
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* @buffer: Destination buffer to fill with random bytes.
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* @len: Size of @buffer in bytes.
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* @flags: Zero or more GRND_* flags.
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* Returns: The number of random bytes written to @buffer, or a negative value indicating an error.
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*/
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static __always_inline ssize_t getrandom_syscall(void *buffer, size_t len, unsigned int flags)
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{
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return syscall3(__NR_getrandom, (long)buffer, (long)len, (long)flags);
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}
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static __always_inline const struct vdso_rng_data *__arch_get_vdso_rng_data(void)
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{
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/*
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* The RNG data is in the real VVAR data page, but if a task belongs to a time namespace
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* then VVAR_DATA_PAGE_OFFSET points to the namespace-specific VVAR page and VVAR_TIMENS_
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* PAGE_OFFSET points to the real VVAR page.
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*/
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if (IS_ENABLED(CONFIG_TIME_NS) && _vdso_data->clock_mode == VDSO_CLOCKMODE_TIMENS)
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return (void *)&_vdso_rng_data + VVAR_TIMENS_PAGE_OFFSET * PAGE_SIZE;
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return &_vdso_rng_data;
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}
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#endif /* !__ASSEMBLY__ */
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#endif /* __ASM_VDSO_GETRANDOM_H */
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