From nobody Sun Feb 8 00:55:59 2026 Received: from fout-a1-smtp.messagingengine.com (fout-a1-smtp.messagingengine.com [103.168.172.144]) (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 325871F7569; Wed, 22 Jan 2025 08:48:08 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=103.168.172.144 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737535691; cv=none; b=iMMB3Sdhtr6LrgF20FlwiKCmfk534bsoOFRVEuJ/hm2BvO7u2QiZM+48y8mE5dym/SP6S9YySl92QVoQ9oh3zC9pDZd7C54OZERv/12Ez5D7B0jBLgMS/KpfdkCJ7qLWZKEUSZw0uRqqnLIDiUkNXZJyXEIWUIqRzteNUdYD/7E= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1737535691; c=relaxed/simple; bh=PBw+2l4k/U/8zjU5cemT5owgK8Rdjbs+7eB+L9/Ycbc=; h=Date:Message-ID:From:To:Cc:Subject; b=jy4IFLPXlmn548AxRa22tSlceOrCtOjWW16LCrR1t+hJ7U4598vIfbx3B0fskjH4IKKLRgDjLrmWym6Pu/EsDrNVVDTEzUUGRiW4zRE/O7EdAEdBri242iqzEGJ09uGS5HTvTcfzMAZuzwPTM4tZiRVTvOvFXC1yOE89lsndAQc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=linux-m68k.org; spf=none smtp.mailfrom=linux-m68k.org; dkim=pass (2048-bit key) header.d=messagingengine.com header.i=@messagingengine.com header.b=sVBWNlSK; arc=none smtp.client-ip=103.168.172.144 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=linux-m68k.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=linux-m68k.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=messagingengine.com header.i=@messagingengine.com header.b="sVBWNlSK" Received: from phl-compute-04.internal (phl-compute-04.phl.internal [10.202.2.44]) by mailfout.phl.internal (Postfix) with ESMTP id 3D6F3138019D; Wed, 22 Jan 2025 03:48:08 -0500 (EST) Received: from phl-mailfrontend-02 ([10.202.2.163]) by phl-compute-04.internal (MEProxy); Wed, 22 Jan 2025 03:48:08 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-type:date:date:feedback-id :feedback-id:from:from:in-reply-to:message-id:reply-to:subject :subject:to:to:x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s= fm3; t=1737535688; x=1737622088; bh=r29dMPQRv+Gn3SilhPT9HklbBYac hEKIULVz8FVwt98=; b=sVBWNlSKkTwm5W9vXSEs6umn0p8aMZm8VvntWbo/ugzW a413P9y3eao45N3+c2eWgRsg9weBYZZ0fuzwuRS7UfMg9QsLbm99pI2Z4SMB6X+p egTRIcrZyc73LV7jq+9c1oaZkAS0Zy8a+33Gmm2y7SYfNm10vubpttHVIO1+9lRr ajPhZgh0afVS+zmfyW9oMWmdwVrTb+89Gd66QzDAI+k+NAflevL5HD5Ze6luIx9q OLiUQULKyawVB1FVT+CirYOH3P6ZPzm/u6Q0HzQicN35qgi0WJGgqfTEDXBSMyF7 doPbuXVdSbHDHlEStVXQOsEe/Toc5sOzeHXCbHk7ug== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeefuddrudejfedguddvudcutefuodetggdotefrod ftvfcurfhrohhfihhlvgemucfhrghsthforghilhdpggftfghnshhusghstghrihgsvgdp uffrtefokffrpgfnqfghnecuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivg hnthhsucdlqddutddtmdenucfjughrpeffkffhvfevufestddtjhdttddttdenucfhrhho mhephfhinhhnucfvhhgrihhnuceofhhthhgrihhnsehlihhnuhigqdhmieekkhdrohhrgh eqnecuggftrfgrthhtvghrnhepheetuddufffgfeekkeejudeivdfgfedtleetkeduleek ueefhfevueekkeeftdeinecuffhomhgrihhnpehkvghrnhgvlhdrohhrghdpvghnthhrhi drshgsnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomhep fhhthhgrihhnsehlihhnuhigqdhmieekkhdrohhrghdpnhgspghrtghpthhtohephedpmh houggvpehsmhhtphhouhhtpdhrtghpthhtohepshhtrggslhgvsehvghgvrhdrkhgvrhhn vghlrdhorhhgpdhrtghpthhtohepghgvvghrtheslhhinhhugidqmheikehkrdhorhhgpd hrtghpthhtohepvhhirhhoseiivghnihhvrdhlihhnuhigrdhorhhgrdhukhdprhgtphht thhopehlihhnuhigqdhmieekkheslhhishhtshdrlhhinhhugidqmheikehkrdhorhhgpd hrtghpthhtoheplhhinhhugidqkhgvrhhnvghlsehvghgvrhdrkhgvrhhnvghlrdhorhhg X-ME-Proxy: Feedback-ID: i58a146ae:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Wed, 22 Jan 2025 03:48:05 -0500 (EST) Date: Wed, 22 Jan 2025 19:47:59 +1100 Message-ID: <590189176a007c7526f041dbf1ff0eea@linux-m68k.org> From: Finn Thain To: stable@vger.kernel.org Cc: Geert Uytterhoeven , Al Viro , linux-m68k@lists.linux-m68k.org, linux-kernel@vger.kernel.org Subject: [PATCH 5.4.y] m68k: Update ->thread.esp0 before calling syscall_trace() in ret_from_signal Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" From: Al Viro [ Upstream commit 50e43a57334400668952f8e551c9d87d3ed2dfef ] We get there when sigreturn has performed obscene acts on kernel stack; in particular, the location of pt_regs has shifted. We are about to call syscall_trace(), which might stop for tracer. If that happens, we'd better have task_pt_regs() returning correct result... Fucked-up-by: Al Viro Fixes: bd6f56a75bb2 ("m68k: Missing syscall_trace() on sigreturn") Signed-off-by: Al Viro Tested-by: Michael Schmitz Reviewed-by: Michael Schmitz Tested-by: Finn Thain Link: https://lore.kernel.org/r/YP2dMWeV1LkHiOpr@zeniv-ca.linux.org.uk Signed-off-by: Geert Uytterhoeven Signed-off-by: Finn Thain --- arch/m68k/kernel/entry.S | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S index 417d8f0e8962..0d03b4f2077b 100644 --- a/arch/m68k/kernel/entry.S +++ b/arch/m68k/kernel/entry.S @@ -182,6 +182,8 @@ ENTRY(ret_from_signal) movel %curptr@(TASK_STACK),%a1 tstb %a1@(TINFO_FLAGS+2) jge 1f + lea %sp@(SWITCH_STACK_SIZE),%a1 + movel %a1,%curptr@(TASK_THREAD+THREAD_ESP0) jbsr syscall_trace 1: RESTORE_SWITCH_STACK addql #4,%sp