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link.Elf: Ensure archive header fields are not left blank

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ld.lld fails with "truncated or malformed archive" errors when reading
archive header field values that are not valid numbers.
This commit is contained in:
Carl Åstholm 2025-11-05 16:34:07 +01:00 • committed by Ryan Liptak
parent 38d44404a5
commit 43eb9b52cc
1 changed files with 5 additions and 1 deletions
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6
src/link/Elf/Archive.zig
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@ -118,7 +118,6 @@ pub fn setArHdr(opts: struct {
.ar_fmag = undefined,
};
@memset(mem.asBytes(&hdr), 0x20);
@memcpy(&hdr.ar_fmag, elf.ARFMAG);
{
var writer: std.Io.Writer = .fixed(&hdr.ar_name);
@ -129,10 +128,15 @@ pub fn setArHdr(opts: struct {
.name_off => |x| writer.print("/{d}", .{x}) catch unreachable,
}
}
hdr.ar_date[0] = '0';
hdr.ar_uid[0] = '0';
hdr.ar_gid[0] = '0';
hdr.ar_mode[0] = '0';
{
var writer: std.Io.Writer = .fixed(&hdr.ar_size);
writer.print("{d}", .{opts.size}) catch unreachable;
}
hdr.ar_fmag = elf.ARFMAG.*;
return hdr;
}