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Avoid UB in the Windows filesystem code in... bootstrap? #101455

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Merged
merged 1 commit into from
Sep 8, 2022
Merged

Avoid UB in the Windows filesystem code in... bootstrap? #101455

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1 change: 1 addition & 0 deletions src/bootstrap/Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,7 @@ features = [
"psapi",
"impl-default",
"timezoneapi",
"winbase",
]

[dev-dependencies]
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10 changes: 6 additions & 4 deletions src/bootstrap/util.rs
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Expand Up @@ -197,9 +197,11 @@ pub fn symlink_dir(config: &Config, src: &Path, dest: &Path) -> io::Result<()> {
ptr::null_mut(),
);

let mut data = [0u8; MAXIMUM_REPARSE_DATA_BUFFER_SIZE as usize];
let db = data.as_mut_ptr() as *mut REPARSE_MOUNTPOINT_DATA_BUFFER;
let buf = &mut (*db).ReparseTarget as *mut u16;
#[repr(C, align(8))]
struct Align8<T>(T);
let mut data = Align8([0u8; MAXIMUM_REPARSE_DATA_BUFFER_SIZE as usize]);
let db = data.0.as_mut_ptr() as *mut REPARSE_MOUNTPOINT_DATA_BUFFER;
let buf = core::ptr::addr_of_mut!((*db).ReparseTarget) as *mut u16;
let mut i = 0;
// FIXME: this conversion is very hacky
let v = br"\??\";
Expand All @@ -219,7 +221,7 @@ pub fn symlink_dir(config: &Config, src: &Path, dest: &Path) -> io::Result<()> {
let res = DeviceIoControl(
h as *mut _,
FSCTL_SET_REPARSE_POINT,
data.as_ptr() as *mut _,
db.cast(),
(*db).ReparseDataLength + 8,
ptr::null_mut(),
0,
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