linux-kernel - Re: [PATCH] objtool: Fix stack overflow in validate

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Message-ID: <aTCMR-7K34UNuxDe@gmail.com>
Date: Wed, 3 Dec 2025 20:15:19 +0100
From: Ingo Molnar <mingo@...nel.org>
To: Josh Poimboeuf <jpoimboe@...nel.org>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org,
	Nathan Chancellor <nathan@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Alexandre Chartre <alexandre.chartre@...cle.com>,
	David Laight <david.laight.linux@...il.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] objtool: Fix stack overflow in validate_branch()

* Josh Poimboeuf <jpoimboe@...nel.org> wrote:

> On Wed, Dec 03, 2025 at 10:54:19AM -0800, Josh Poimboeuf wrote:
> > Keep in mind this is a worst case function for objtool: KASAN with tons
> > of memory accesses.  The vast majority of functions won't come anywhere
> > near that level of recursion.
> 
> And BTW, supporting that further, the max recursion depth on vmlinux.o
> on a defconfig kernel is showing 162.

That's mostly immaterial - 'make allmodconfig' is not some esoteric
test, it's one of the most common testing methods by developers and CI
projects ... For example I use allmodconfig builds for every commit I
write or apply.

Thanks,

	Ingo