From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B1E33339361 for ; Wed, 12 Aug 2026 12:09:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786536549; cv=none; b=ZSQnN/wZqWNn6GU8y4FBeOp3m4L8deOS9Aly9h1hEy1ePpULzEv1HQHarm02xU1oPv/O29VTyXjespbf9C4ZJDY4vKF7hpsh1PB0QJsg/NcwDPCSrjuyKXBTRpuETSeV2Z+z7+IAq03OX+jQlnGUkFAQGXMnXheIjU/h+RsLbVo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786536549; c=relaxed/simple; bh=X9oEhjmyOE5MegY24qZ3tmXETaWm5c6HNy7IfVFRxss=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=WDbX6VRqFAzabziEgvT7taigNM++GyUmZtj6lLVZk3r2uOpdXebOpMQZhBXjuyjd/tcQDtEEX/y7ypFDgg6QGI6UWKh0LucjDsocOTpVHiAj2Euh88mZb3e2PY7cVWoYFmYk4M7iB05jIGb7OVxho7IGtm0EFKlc56JGLwygrD0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FDAkffAB; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="FDAkffAB" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 174C01F000E9; Wed, 12 Aug 2026 12:09:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1786536548; bh=dXCVFy3Yiy0uZz31vPc+o0EnvztfwFk2wLhWfLPEQy0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=FDAkffAB+OU34vurLIkM7zx4W46P8zSgyFFcth1g+LOWUw2hurxz3+MdYFjFueu6A W4ky5lwI5mHIFP4YDBgQtWxrzymuszFwphsvDYbbjTvldRzeS5T4ZX51zGer93RBn9 4s7Dnj+/OZAd9LsVAmvoFc3h9PQNuaMSiFyjIyZg29eqOhyIq9OGTWdq3EJrkCnn27 6jRH2Z5iir4/Ddj0ySN6FNhTxspMp9HcGvlU9rywFB1h7UHN+5q30/q0ma+x8KdEgC FdP/Y3eraKM7ixvqEj3SG9K5fMK67hRG0hiBLDIe0neXeqfCly5Pjp6EWMgq0IZpGk 7Uxew/bKgJSHg== From: Will Deacon To: linux-arm-kernel@lists.infradead.org, Will Deacon Cc: catalin.marinas@arm.com, kernel-team@android.com, linux-kernel@vger.kernel.org, Ard Biesheuvel , Gus Bourg Subject: Re: [PATCH] arm64/efi: Avoid voluntary preemption with efi_mm installed Date: Wed, 12 Aug 2026 13:09:01 +0100 Message-ID: <178653008050.3619485.9655082628156363695.b4-ty@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260811140430.22832-1-will@kernel.org> References: <20260811140430.22832-1-will@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit On Tue, 11 Aug 2026 15:04:29 +0100, Will Deacon wrote: > Gus reports a bad kernel memory access when using software PAN > (CONFIG_ARM64_SW_TTBR0_PAN=y) on a machine with support for EFI runtime > services: > > Unable to handle kernel access to user memory outside uaccess routines > at virtual address 00000000f322ff30 > Mem abort info: > ESR = 0x0000000096000004 > FSC = 0x04: level 0 translation fault > Internal error: Oops: 0000000096000004 [#1] SMP > Workqueue: efi_rts_wq efi_call_rts > pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) > pc : efi_call_rts+0xd8/0x288 > Call trace: > efi_call_rts+0xd8/0x288 (P) > process_one_work+0x178/0x4f8 > worker_thread+0x194/0x328 > > [...] Applied to arm64 (for-next/mm), thanks! [1/1] arm64/efi: Avoid voluntary preemption with efi_mm installed https://git.kernel.org/arm64/c/e98a9d014637 Cheers, -- Will https://fixes.arm64.dev https://next.arm64.dev https://will.arm64.dev