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Handle set-size rights correctly when truncating a file.

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If a path_open call is requesting __WASI_RIGHT_FD_FILESTAT_SET_SIZE,
interpret that as a request for write privleges. If it is requesting
O_TRUNC, require __WASI_RIGHT_PATH_FILESTAT_SET_SIZE, since this is
a path operation rather than a FD operation.
This commit is contained in:
Dan Gohman
2019-05-17 15:45:31 -07:00
committed by Jakub Konka
parent d20d787bb7
commit 32da43f600
1 changed files with 2 additions and 2 deletions
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4
src/hostcalls/fs.rs
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@@ -658,7 +658,7 @@ pub fn path_open(
& (host::__WASI_RIGHT_FD_DATASYNC
| host::__WASI_RIGHT_FD_WRITE
| host::__WASI_RIGHT_FD_ALLOCATE
| host::__WASI_RIGHT_PATH_FILESTAT_SET_SIZE)
| host::__WASI_RIGHT_FD_FILESTAT_SET_SIZE)
!= 0;
let mut nix_all_oflags = if read && write {
@@ -683,7 +683,7 @@ pub fn path_open(
needed_base |= host::__WASI_RIGHT_PATH_CREATE_FILE;
}
if nix_all_oflags.contains(OFlag::O_TRUNC) {
needed_inheriting |= host::__WASI_RIGHT_PATH_FILESTAT_SET_SIZE;
needed_base |= host::__WASI_RIGHT_PATH_FILESTAT_SET_SIZE;
}
// convert file descriptor flags