Re: use of ccache 4.14 can result in a defect in the FreeBSD kernel

Reply: Alexander Leidinger : "Re: use of ccache 4.14 can result in a defect in the FreeBSD kernel"
In reply to: Alexander Leidinger : "use of ccache 4.14 can result in a defect in the FreeBSD kernel"
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From: Enji Cooper (yaneurabeya) <yaneurabeya_at_gmail.com>
Date: Mon, 02 Nov 2026 04:04:03 UTC

> On Nov 1, 2026, at 7:08 AM, Alexander Leidinger <Alexander@Leidinger.net> wrote:
> 
> Hi,
> 
> The defect: from 4.14 on, ccache in its default direct mode looks for .incbin only in the raw source text, and only before a literal quote. vdso_wrap.S names the file through a macro (VDSO_FILE), so the check misses it. In direct mode the preprocessed text, where the name would be visible, is no longer scanned.
> 
> When it hits: when the vDSO changes.
> 
> The workaround: use CCACHE_NODIRECT=1

Hi Alexander,
	What’s the net-effect of this issue? Is it a functional problem? Is it a security problem? Etc. Is there a bug tracking this issue on Bugzilla?
Thank you,
-Enji