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/* SPDX-License-Identifier: GPL-2.0 */ #ifndef __ASM_VDSO_GETRANDOM_H #define __ASM_VDSO_GETRANDOM_H #ifndef __ASSEMBLY__ #include <vdso/datapage.h> #include <asm/vdso/vsyscall.h> #include <asm/syscall.h> #include <asm/unistd.h> #include <asm/page.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) { return syscall3(__NR_getrandom, (long)buffer, (long)len, (long)flags); } static __always_inline const struct vdso_rng_data *__arch_get_vdso_rng_data(void) { /* * The RNG data is in the real VVAR data page, but if a task belongs to a time namespace * then VVAR_DATA_PAGE_OFFSET points to the namespace-specific VVAR page and VVAR_TIMENS_ * PAGE_OFFSET points to the real VVAR page. */ if (IS_ENABLED(CONFIG_TIME_NS) && _vdso_data->clock_mode == VDSO_CLOCKMODE_TIMENS) return (void *)&_vdso_rng_data + VVAR_TIMENS_PAGE_OFFSET * PAGE_SIZE; return &_vdso_rng_data; } #endif /* !__ASSEMBLY__ */ #endif /* __ASM_VDSO_GETRANDOM_H */