archives/zig
1
0
Fork 0
mirror of https://codeberg.org/ziglang/zig.git synced 2026-03-08 02:24:33 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

std.Io.Threaded: don't assume dirents are aligned

Browse source 
Linux kernel seems to do it but qemu user mode seems not to.
This commit is contained in:
Andrew Kelley 2025-12-19 16:19:01 -08:00
parent 6cfd2df695
commit 52ba2a4c72
1 changed files with 4 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

5
lib/std/Io/Threaded.zig
View file

@ -3440,7 +3440,10 @@ fn dirReadLinux(userdata: ?*anyopaque, dr: *Dir.Reader, buffer: []Dir.Entry) Dir
// by looking at only the 8 bytes before the next record. However since
// file names are usually short it's better to keep the machine code
// simpler.
const linux_entry: *linux.dirent64 = @ptrCast(@alignCast(&dr.buffer[dr.index]));
//
// Furthermore, I observed qemu user mode to not align this struct, so
// this code makes the conservative choice to not assume alignment.
const linux_entry: *align(1) linux.dirent64 = @ptrCast(&dr.buffer[dr.index]);
const next_index = dr.index + linux_entry.reclen;
dr.index = next_index;
const name_ptr: [*]u8 = &linux_entry.name;