linux-kernel - Re: [PATCH v2] arm64: ftrace: fix unreachable PLT for ftrace_caller in init_module with CONFIG_DYNAMIC

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Message-ID: <175708881849.3546185.8607701618216308416.b4-ty@arm.com>
Date: Fri,  5 Sep 2025 17:13:50 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: will@...nel.org,
	rostedt@...dmis.org,
	mhiramat@...nel.org,
	mark.rutland@....com,
	samitolvanen@...gle.com,
	song@...nel.org,
	ardb@...nel.org,
	dylanbhatch@...gle.com,
	panfan <panfan@....qualcomm.com>
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	kdong@....qualcomm.com,
	haijianc@....qualcomm.com
Subject: Re: [PATCH v2] arm64: ftrace: fix unreachable PLT for ftrace_caller in init_module with CONFIG_DYNAMIC_FTRACE

On Thu, 04 Sep 2025 20:22:36 -0700, panfan wrote:
> On arm64, it has been possible for a module's sections to be placed more
> than 128M away from each other since commit:
> 
>   commit 3e35d303ab7d ("arm64: module: rework module VA range selection")
> 
> Due to this, an ftrace callsite in a module's .init.text section can be
> out of branch range for the module's ftrace PLT entry (in the module's
> .text section). Any attempt to enable tracing of that callsite will
> result in a BRK being patched into the callsite, resulting in a fatal
> exception when the callsite is later executed.
> 
> [...]

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

[1/1] arm64: ftrace: fix unreachable PLT for ftrace_caller in init_module with CONFIG_DYNAMIC_FTRACE
      https://git.kernel.org/arm64/c/a7ed7b9d0ebb

-- 
Catalin