linux-kernel - Re: [PATCH] arm64: prohibit probing on arch_kunwind_consume

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Message-Id: <170955720098.2136218.47711104039103934.b4-ty@kernel.org>
Date: Mon,  4 Mar 2024 13:41:16 +0000
From: Will Deacon <will@...nel.org>
To: catalin.marinas@....com,
	nathan@...nel.org,
	mark.rutland@....com,
	broonie@...nel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev,
	Puranjay Mohan <puranjay12@...il.com>
Cc: kernel-team@...roid.com,
	Will Deacon <will@...nel.org>
Subject: Re: [PATCH] arm64: prohibit probing on arch_kunwind_consume_entry()

On Thu, 29 Feb 2024 23:16:20 +0000, Puranjay Mohan wrote:
> Make arch_kunwind_consume_entry() as __always_inline otherwise the
> compiler might not inline it and allow attaching probes to it.
> 
> Without this, just probing arch_kunwind_consume_entry() via
> <tracefs>/kprobe_events will crash the kernel on arm64.
> 
> The crash can be reproduced using the following compiler and kernel
> combination:
> clang version 19.0.0git (https://github.com/llvm/llvm-project.git d68d29516102252f6bf6dc23fb22cef144ca1cb3)
> commit 87adedeba51a ("Merge tag 'net-6.8-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net")
> 
> [...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] arm64: prohibit probing on arch_kunwind_consume_entry()
      https://git.kernel.org/arm64/c/2c79bd34af13

Cheers,
-- 
Will

https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev