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vdso: Add generic random data storage

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Extend the generic vDSO data storage with a page for the random state data.
The random state data is stored in a dedicated page, as the existing
storage page is only meant for time-related, time-namespace-aware data.
This simplifies to access logic to not need to handle time namespaces
anymore and also frees up more space in the time-related page.

In case further generic vDSO data store is required it can be added to
the random state page.

Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/all/20250204-vdso-store-rng-v3-6-13a4669dfc8c@linutronix.de
This commit is contained in:
Thomas Weißschuh
2025-02-04 13:05:38 +01:00
committed by Thomas Gleixner
parent df7fcbefa7
commit 51d6ca373f
5 changed files with 45 additions and 5 deletions
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8
lib/vdso/getrandom.c
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@@ -12,6 +12,9 @@
#include <uapi/linux/mman.h>
#include <uapi/linux/random.h>
/* Bring in default accessors */
#include <vdso/vsyscall.h>
#undef PAGE_SIZE
#undef PAGE_MASK
#define PAGE_SIZE (1UL << CONFIG_PAGE_SHIFT)
@@ -152,7 +155,7 @@ retry_generation:
/*
* Prevent the syscall from being reordered wrt current_generation. Pairs with the
* smp_store_release(&_vdso_rng_data.generation) in random.c.
* smp_store_release(&vdso_k_rng_data->generation) in random.c.
*/
smp_rmb();
@@ -256,5 +259,6 @@ fallback_syscall:
static __always_inline ssize_t
__cvdso_getrandom(void *buffer, size_t len, unsigned int flags, void *opaque_state, size_t opaque_len)
{
return __cvdso_getrandom_data(__arch_get_vdso_rng_data(), buffer, len, flags, opaque_state, opaque_len);
return __cvdso_getrandom_data(__arch_get_vdso_u_rng_data(), buffer, len, flags,
opaque_state, opaque_len);
}