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Write time to user only if addr is not zero

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This commit is contained in:
Jianfeng Jiang
2023-12-13 07:36:28 +00:00
committed by Tate, Hongliang Tian
parent 8f51259a10
commit a18fc9eb25
1 changed files with 11 additions and 4 deletions
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15
kernel/aster-nix/src/syscall/time.rs
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@ -6,8 +6,15 @@ use crate::{log_syscall_entry, prelude::*, time::SystemTime, util::write_val_to_
pub fn sys_time(tloc: Vaddr) -> Result<SyscallReturn> { pub fn sys_time(tloc: Vaddr) -> Result<SyscallReturn> {
log_syscall_entry!(SYS_TIME); log_syscall_entry!(SYS_TIME);
debug!("tloc = 0x{tloc:x}"); debug!("tloc = 0x{tloc:x}");
let now = SystemTime::now();
let now_as_secs = now.duration_since(&SystemTime::UNIX_EPOCH)?.as_secs(); let now_as_secs = {
write_val_to_user(tloc, &now_as_secs)?; let now = SystemTime::now();
Ok(SyscallReturn::Return(0)) now.duration_since(&SystemTime::UNIX_EPOCH)?.as_secs()
};
if tloc != 0 {
write_val_to_user(tloc, &now_as_secs)?;
}
Ok(SyscallReturn::Return(now_as_secs as _))
} }