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impl sys_set_tid_address. ignore invalid 'clear_child_tid' on exit

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This commit is contained in:
WangRunji 2019-05-04 00:19:35 +08:00
parent 98a99e33c6
commit 08d10522ff
4 changed files with 29 additions and 27 deletions
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25
kernel/src/arch/x86_64/paging.rs
View File

@ -47,23 +47,21 @@ impl PageTable for ActivePageTable {
fn map(&mut self, addr: usize, target: usize) -> &mut Entry {
let flags = EF::PRESENT | EF::WRITABLE | EF::NO_EXECUTE;
unsafe {
if let Ok(flush) = self.0.map_to(
Page::of_addr(addr),
Frame::of_addr(target),
flags,
&mut FrameAllocatorForX86,
) {
flush.flush();
}
self.0
.map_to(
Page::of_addr(addr),
Frame::of_addr(target),
flags,
&mut FrameAllocatorForX86,
)
.unwrap()
.flush();
}
unsafe { &mut *(get_entry_ptr(addr, 1)) }
}
fn unmap(&mut self, addr: usize) {
// unmap and flush if it is mapped
if let Ok((_, flush)) = self.0.unmap(Page::of_addr(addr)) {
flush.flush();
}
self.0.unmap(Page::of_addr(addr)).unwrap().1.flush();
}
fn get_entry(&mut self, addr: usize) -> Option<&mut Entry> {
@ -238,6 +236,9 @@ impl InactivePageTable for InactivePageTable0 {
fn edit<T>(&mut self, f: impl FnOnce(&mut Self::Active) -> T) -> T {
let target = Cr3::read().0.start_address().as_u64() as usize;
if self.p4_frame == Cr3::read().0 {
return f(&mut active_table());
}
active_table().with_temporary_map(target, |active_table, p4_table: &mut x86PageTable| {
let backup = p4_table[0o777].clone();

8
kernel/src/syscall/mem.rs
View File

@ -88,14 +88,6 @@ pub fn sys_mprotect(addr: usize, len: usize, prot: usize) -> SysResult {
if memory_area.is_none() {
return Err(SysError::ENOMEM);
}
proc.vm.edit(|pt| {
for page in Page::range_of(addr, addr + len) {
let entry = pt
.get_entry(page.start_address())
.expect("failed to get entry");
attr.apply(entry);
}
});
Ok(0)
}

2
kernel/src/syscall/mod.rs
View File

@ -187,7 +187,7 @@ pub fn syscall(id: usize, args: [usize; 6], tf: &mut TrapFrame) -> isize {
SYS_EXIT => sys_exit(args[0] as usize),
SYS_EXIT_GROUP => sys_exit_group(args[0]),
SYS_WAIT4 => sys_wait4(args[0] as isize, args[1] as *mut i32), // TODO: wait4
SYS_SET_TID_ADDRESS => unimplemented("set_tid_address", Ok(thread::current().id())),
SYS_SET_TID_ADDRESS => sys_set_tid_address(args[0] as *mut u32),
SYS_FUTEX => sys_futex(
args[0],
args[1] as u32,

21
kernel/src/syscall/proc.rs
View File

@ -281,14 +281,17 @@ pub fn sys_exit(exit_code: usize) -> ! {
// ref: http://man7.org/linux/man-pages/man2/set_tid_address.2.html
// FIXME: do it in all possible ways a thread can exit
// it has memory access so we can't move it to Thread::drop?
let clear_child_tid = current_thread().clear_child_tid;
if clear_child_tid != 0 {
unsafe {
(clear_child_tid as *mut u32).write(0);
let mut proc = process();
let clear_child_tid = current_thread().clear_child_tid as *mut u32;
if !clear_child_tid.is_null() {
info!("exit: futex {:#?} wake 1", clear_child_tid);
if let Ok(clear_child_tid_ref) = unsafe { proc.vm.check_write_ptr(clear_child_tid) } {
*clear_child_tid_ref = 0;
let queue = proc.get_futex(clear_child_tid as usize);
queue.notify_one();
}
let queue = process().get_futex(clear_child_tid);
queue.notify_one();
}
drop(proc);
processor().manager().exit(tid, exit_code as usize);
processor().yield_now();
@ -334,6 +337,12 @@ pub fn sys_set_priority(priority: usize) -> SysResult {
Ok(0)
}
pub fn sys_set_tid_address(tidptr: *mut u32) -> SysResult {
info!("set_tid_address: {:?}", tidptr);
current_thread().clear_child_tid = tidptr as usize;
Ok(thread::current().id())
}
bitflags! {
pub struct CloneFlags: usize {
const CSIGNAL = 0x000000ff;