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syscalls: sys_getrand: implement

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Implement sys_getrand
This commit is contained in:
Matthew Leach
2025-11-28 20:47:09 +00:00
committed by Matthew Leach
parent 5f2c2491b8
commit 8038a6c4e2
6 changed files with 45 additions and 1 deletions
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1
Cargo.lock generated
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@@ -250,6 +250,7 @@ dependencies = [
"num-traits",
"object",
"paste",
"rand",
"ringbuf",
"static_cell",
"thiserror",

1
Cargo.toml
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@@ -26,6 +26,7 @@ num-traits = { version = "0.2", default-features = false }
ringbuf = { version = "0.4.8", default-features = false, features = ["alloc"] }
bitflags = "2.9.1"
futures = { version = "0.3.31", default-features = false, features = ["alloc"] }
rand = { version = "0.9.2", default-features = false, features = ["small_rng"] }
[profile.release]
strip = true

2
etc/syscalls_linux_aarch64.md
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@@ -262,7 +262,7 @@
| 0x113 (275) | sched_getattr | (pid_t pid, struct sched_attr *uattr, unsigned int usize, unsigned int flags) | __arm64_sys_sched_getattr | false |
| 0x114 (276) | renameat2 | (int olddfd, const char *oldname, int newdfd, const char *newname, unsigned int flags) | __arm64_sys_renameat2 | false |
| 0x115 (277) | seccomp | (unsigned int op, unsigned int flags, void *uargs) | __arm64_sys_seccomp | false |
| 0x116 (278) | getrandom | (char *ubuf, size_t len, unsigned int flags) | __arm64_sys_getrandom | false |
| 0x116 (278) | getrandom | (char *ubuf, size_t len, unsigned int flags) | __arm64_sys_getrandom | true |
| 0x117 (279) | memfd_create | (const char *uname, unsigned int flags) | __arm64_sys_memfd_create | false |
| 0x118 (280) | bpf | (int cmd, union bpf_attr *uattr, unsigned int size) | __arm64_sys_bpf | false |
| 0x119 (281) | execveat | (int fd, const char *filename, const char *const *argv, const char *const *envp, int flags) | __arm64_sys_execveat | false |

2
src/arch/arm64/exceptions/syscall.rs
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@@ -1,4 +1,5 @@
use crate::kernel::power::sys_reboot;
use crate::kernel::rand::sys_getrandom;
use crate::{
arch::{Arch, ArchImpl},
clock::{gettime::sys_clock_gettime, timeofday::sys_gettimeofday},
@@ -265,6 +266,7 @@ pub async fn handle_syscall() {
)
.await
}
0x116 => sys_getrandom(TUA::from_value(arg1 as _), arg2 as _, arg3 as _).await,
0x125 => Err(KernelError::NotSupported),
0x1b7 => {
sys_faccessat2(

1
src/kernel/mod.rs
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@@ -1,3 +1,4 @@
pub mod kpipe;
pub mod power;
pub mod rand;
pub mod uname;

39
src/kernel/rand.rs Normal file
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@@ -0,0 +1,39 @@
// TODO: generate a pool of entropy.
use crate::{
drivers::timer::uptime,
memory::uaccess::copy_to_user_slice,
sync::{OnceLock, SpinLock},
};
use alloc::vec::Vec;
use libkernel::error::Result;
use libkernel::memory::address::TUA;
use rand::{RngCore, SeedableRng, rngs::SmallRng};
pub async fn sys_getrandom(ubuf: TUA<u8>, size: isize, _flags: u32) -> Result<usize> {
let buf = {
let mut rng = ENTROPY_POOL
.get_or_init(|| {
let now = uptime();
SpinLock::new(SmallRng::seed_from_u64(
(now.as_micros() & 0xffffffff_ffffffff) as u64,
))
})
.lock_save_irq();
let mut buf = Vec::with_capacity(size as usize);
for _ in 0..size {
buf.push((rng.next_u32() & 0xff) as u8);
}
buf
};
copy_to_user_slice(&buf, ubuf.to_untyped()).await?;
Ok(size as _)
}
static ENTROPY_POOL: OnceLock<SpinLock<SmallRng>> = OnceLock::new();