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Don't create a slice to potential uninit data on h1 encoder (#2364)

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Co-authored-by: Rob Ede <robjtede@icloud.com>
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Thales 2021-08-13 14:41:19 -03:00 committed by GitHub
parent 384164cc14
commit a0c0bff944
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3 changed files with 22 additions and 7 deletions
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4
actix-http/CHANGES.md
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@ -2,6 +2,10 @@
## Unreleased - 2021-xx-xx
### Fixed
* Remove slice creation pointing to potential uninitialized data on h1 encoder. [#2364]
[#2364]: https://github.com/actix/actix-web/pull/2364
## 3.0.0-beta.8 - 2021-08-09
### Fixed

10
actix-http/benches/write-camel-case.rs
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@ -18,7 +18,8 @@ fn bench_write_camel_case(c: &mut Criterion) {
group.bench_with_input(BenchmarkId::new("New", i), bts, |b, bts| {
b.iter(|| {
let mut buf = black_box([0; 24]);
_new::write_camel_case(black_box(bts), &mut buf)
let len = black_box(bts.len());
_new::write_camel_case(black_box(bts), buf.as_mut_ptr(), len)
});
});
}
@ -30,9 +31,12 @@ criterion_group!(benches, bench_write_camel_case);
criterion_main!(benches);
mod _new {
pub fn write_camel_case(value: &[u8], buffer: &mut [u8]) {
pub fn write_camel_case(value: &[u8], buf: *mut u8, len: usize) {
// first copy entire (potentially wrong) slice to output
buffer[..value.len()].copy_from_slice(value);
let buffer = unsafe {
std::ptr::copy_nonoverlapping(value.as_ptr(), buf, len);
std::slice::from_raw_parts_mut(buf, len)
};
let mut iter = value.iter();

15
actix-http/src/h1/encoder.rs
View file

@ -175,7 +175,7 @@ pub(crate) trait MessageType: Sized {
unsafe {
if camel_case {
// use Camel-Case headers
write_camel_case(k, from_raw_parts_mut(buf, k_len));
write_camel_case(k, buf, k_len);
} else {
write_data(k, buf, k_len);
}
@ -473,15 +473,22 @@ impl TransferEncoding {
}
/// # Safety
/// Callers must ensure that the given length matches given value length.
/// Callers must ensure that the given `len` matches the given `value` length and that `buf` is
/// valid for writes of at least `len` bytes.
unsafe fn write_data(value: &[u8], buf: *mut u8, len: usize) {
debug_assert_eq!(value.len(), len);
copy_nonoverlapping(value.as_ptr(), buf, len);
}
fn write_camel_case(value: &[u8], buffer: &mut [u8]) {
/// # Safety
/// Callers must ensure that the given `len` matches the given `value` length and that `buf` is
/// valid for writes of at least `len` bytes.
unsafe fn write_camel_case(value: &[u8], buf: *mut u8, len: usize) {
// first copy entire (potentially wrong) slice to output
buffer[..value.len()].copy_from_slice(value);
write_data(value, buf, len);
// SAFETY: We just initialized the buffer with `value`
let buffer = from_raw_parts_mut(buf, len);
let mut iter = value.iter();