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random: vDSO: add a __vdso_getrandom prototype for all architectures

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Without a prototype, we'll have to add a prototype for each architecture
implementing vDSO getrandom. As most architectures will likely have the
vDSO getrandom implemented in a near future, and we'd like to keep the
declarations compatible everywhere (to ease the libc implementor work),
we should really just have one copy of the prototype.

This also is what's already done inside of include/vdso/gettime.h for
those vDSO functions, so this continues that convention.

Suggested-by: Huacai Chen <chenhuacai@kernel.org>
Signed-off-by: Xi Ruoyao <xry111@xry111.site>
Acked-by: Huacai Chen <chenhuacai@kernel.org>
[Jason: rewrite docbook comment for prototype.]
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Xi Ruoyao 2024-09-01 14:13:10 +08:00 committed by Jason A. Donenfeld
parent 67a121ac8f
commit 4d456f0c87
2 changed files with 15 additions and 2 deletions
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2
arch/x86/entry/vdso/vgetrandom.c
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@ -6,8 +6,6 @@
#include "../../../../lib/vdso/getrandom.c"
ssize_t __vdso_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state, size_t opaque_len);
ssize_t __vdso_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state, size_t opaque_len)
{
return __cvdso_getrandom(buffer, len, flags, opaque_state, opaque_len);

15
include/vdso/getrandom.h
View File

@ -56,4 +56,19 @@ struct vgetrandom_state {
*/
extern void __arch_chacha20_blocks_nostack(u8 *dst_bytes, const u32 *key, u32 *counter, size_t nblocks);
/**
* __vdso_getrandom - Architecture-specific vDSO implementation of getrandom() syscall.
* @buffer: Passed to __cvdso_getrandom().
* @len: Passed to __cvdso_getrandom().
* @flags: Passed to __cvdso_getrandom().
* @opaque_state: Passed to __cvdso_getrandom().
* @opaque_len: Passed to __cvdso_getrandom();
*
* This function is implemented by making a single call to to __cvdso_getrandom(), whose
* documentation may be consulted for more information.
*
* Returns: The return value of __cvdso_getrandom().
*/
extern ssize_t __vdso_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state, size_t opaque_len);
#endif /* _VDSO_GETRANDOM_H */