With the current implementation, __cvdso_getrandom_data() calls
memset(), which is unexpected in the VDSO.
Rewrite opaque data initialisation to avoid memset().
Signed-off-by: Christophe Leroy <christophe.leroy@xxxxxxxxxx>
---
lib/vdso/getrandom.c | 14 +++++++++-----
1 file changed, 9 insertions(+), 5 deletions(-)
diff --git a/lib/vdso/getrandom.c b/lib/vdso/getrandom.c
index b230f0b10832..425a422651de 100644
--- a/lib/vdso/getrandom.c
+++ b/lib/vdso/getrandom.c
@@ -73,11 +73,15 @@ __cvdso_getrandom_data(const struct vdso_rng_data *rng_info, void *buffer, size_
u32 counter[2] = { 0 };
if (unlikely(opaque_len == ~0UL && !buffer && !len && !flags)) {
- *(struct vgetrandom_opaque_params *)opaque_state = (struct vgetrandom_opaque_params) {
- .size_of_opaque_state = sizeof(*state),
- .mmap_prot = PROT_READ | PROT_WRITE,
- .mmap_flags = MAP_DROPPABLE | MAP_ANONYMOUS
- };
+ struct vgetrandom_opaque_params *params = opaque_state;
+ int i;
+
+ params->size_of_opaque_state = sizeof(*state);
+ params->mmap_prot = PROT_READ | PROT_WRITE;
+ params->mmap_flags = MAP_DROPPABLE | MAP_ANONYMOUS;
+ for (i = 0; i < ARRAY_SIZE(params->reserved); i++)
+ params->reserved[i] = 0;
+
return 0;
}
--
2.44.0
