linux-kernel - Re: [syzbot ci] Re: Compiler-Based Capability- and Locking-Analysis

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Message-ID: <aM0A0p4-3lwLeAWF@elver.google.com>
Date: Fri, 19 Sep 2025 09:05:54 +0200
From: Marco Elver <elver@...gle.com>
To: syzbot ci <syzbot+ciac51bb7578ba7c59@...kaller.appspotmail.com>
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Subject: Re: [syzbot ci] Re: Compiler-Based Capability- and Locking-Analysis

On Thu, Sep 18, 2025 at 12:41PM -0700, syzbot ci wrote:
> syzbot ci has tested the following series
> 
> [v3] Compiler-Based Capability- and Locking-Analysis
[...]
> and found the following issue:
> general protection fault in validate_page_before_insert
> 
> Full report is available here:
> https://ci.syzbot.org/series/81182522-74c0-4494-bcf8-976133df7dc7
> 
> ***
> 
> general protection fault in validate_page_before_insert

Thanks, syzbot ci!

I messed up the type when moving kcov->area access inside the critical
section. This is the fix:


    fixup! kcov: Enable capability analysis

diff --git a/kernel/kcov.c b/kernel/kcov.c
index 1897c8ca6209..e81e3c0d01c6 100644
--- a/kernel/kcov.c
+++ b/kernel/kcov.c
@@ -497,7 +497,7 @@ static int kcov_mmap(struct file *filep, struct vm_area_struct *vma)
 	unsigned long size, off;
 	struct page *page;
 	unsigned long flags;
-	unsigned long *area;
+	void *area;
 
 	spin_lock_irqsave(&kcov->lock, flags);
 	size = kcov->size * sizeof(unsigned long);