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add rights checking fn for future-proofing reasons

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This commit is contained in:
Mark McCaskey 2019-04-02 15:51:49 -07:00
parent fe4195fff6
commit 697bdc7d46
1 changed files with 8 additions and 3 deletions
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11
lib/wasi/src/syscalls/mod.rs
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@ -26,6 +26,11 @@ fn get_wasi_state(ctx: &Ctx) -> &mut WasiState {
unsafe { &mut *(ctx.data as *mut WasiState) }
}
/// checks that `rights_check_set` is a subset of `rights_set`
fn has_rights(rights_set: __wasi_rights_t, rights_check_set: __wasi_rights_t) -> bool {
rights_set | rights_check_set == rights_set
}
#[must_use]
fn write_buffer_array(
memory: &Memory,
@ -306,7 +311,7 @@ pub fn fd_fdstat_set_flags(
let state = get_wasi_state(ctx);
let fd_entry = wasi_try!(state.fs.fd_map.get_mut(&fd).ok_or(__WASI_EBADF));
if fd_entry.rights & __WASI_RIGHT_FD_FDSTAT_SET_FLAGS == 0 {
if !has_rights(fd_entry.rights, __WASI_RIGHT_FD_FDSTAT_SET_FLAGS) {
return __WASI_EACCES;
}
@ -535,7 +540,7 @@ pub fn fd_read(
let state = get_wasi_state(ctx);
let fd_entry = wasi_try!(state.fs.fd_map.get_mut(&fd).ok_or(__WASI_EBADF));
if fd_entry.rights & __WASI_RIGHT_FD_READ == 0 {
if !has_rights(fd_entry.rights, __WASI_RIGHT_FD_READ) {
// TODO: figure out the error to return when lacking rights
return __WASI_EACCES;
}
@ -740,7 +745,7 @@ pub fn fd_write(
let state = get_wasi_state(ctx);
let fd_entry = wasi_try!(state.fs.fd_map.get_mut(&fd).ok_or(__WASI_EBADF));
if fd_entry.rights & __WASI_RIGHT_FD_WRITE == 0 {
if !has_rights(fd_entry.rights, __WASI_RIGHT_FD_WRITE) {
// TODO: figure out the error to return when lacking rights
return __WASI_EACCES;
}