From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 EBD34B641; Tue, 16 Jul 2024 15:38:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721144331; cv=none; b=BrGBDdEmI3ZHNPcFbOotB7y+78f0RZk1VWqD3EveZ3UPn1efEcQtBjZmLHAo7cyL+F//WDnXlzcCTUTAe6Gv4pHIGKceX7qeRZ+432nXSpDg2F7gUi6j8XmsbdplqzkDTH5OsonUIMieuvna19k6wSc9hmq1kxtPFZy2cp5vMXo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1721144331; c=relaxed/simple; bh=lfM+6k/rouzS4RL0B95zjf0hPFXBuMa922+uqAO7ye0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=I5MTbif4MZ6qbUcCQFTvScqz6U1/gbyyWd9w55kkq5qRix9CydSGlj9V033jZTLIWaPzJv66ANXOWvyOCUULVJfELm0q0mjurzsc0jvAFlFqgtWl2w+/EfPNjVbMv7D5LoRor5QqT7IwisT7Om+tHB6UO3M7rGW6I62mfvtnuZM= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=UTKZ2+Mt; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="UTKZ2+Mt" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 760E5C116B1; Tue, 16 Jul 2024 15:38:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1721144330; bh=lfM+6k/rouzS4RL0B95zjf0hPFXBuMa922+uqAO7ye0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UTKZ2+MtwiyUAS94/8UmsOcHos0wRSWQv9zreeZa7iVkcKw5HKUn60IDbEBmsatLu ihRE5U8pAw0fu0GqioLH0pyzdBlaqX1zt7O98J6cZVFOd+iWnP2J2nwmiJeFVBJ9jF 82pIQX/hOv4CyAkcsw1NqGVfdcSIi+0kXGUcYHp4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Greg Kurz , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , Michael Ellerman , Sasha Levin Subject: [PATCH 5.4 19/78] powerpc/xmon: Check cpu id in commands "c#", "dp#" and "dx#" Date: Tue, 16 Jul 2024 17:30:51 +0200 Message-ID: <20240716152741.372730135@linuxfoundation.org> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20240716152740.626160410@linuxfoundation.org> References: <20240716152740.626160410@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 5.4-stable review patch. If anyone has any objections, please let me know. ------------------ From: Greg Kurz [ Upstream commit 8873aab8646194a4446117bb617cc71bddda2dee ] All these commands end up peeking into the PACA using the user originated cpu id as an index. Check the cpu id is valid in order to prevent xmon to crash. Instead of printing an error, this follows the same behavior as the "lp s #" command : ignore the buggy cpu id parameter and fall back to the #-less version of the command. Signed-off-by: Greg Kurz Reviewed-by: Cédric Le Goater Signed-off-by: Michael Ellerman Link: https://msgid.link/161531347060.252863.10490063933688958044.stgit@bahia.lan Signed-off-by: Sasha Levin --- arch/powerpc/xmon/xmon.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c index 6d130c89fbd85..5991fd06b6525 100644 --- a/arch/powerpc/xmon/xmon.c +++ b/arch/powerpc/xmon/xmon.c @@ -1214,7 +1214,7 @@ static int cpu_cmd(void) unsigned long cpu, first_cpu, last_cpu; int timeout; - if (!scanhex(&cpu)) { + if (!scanhex(&cpu) || cpu >= num_possible_cpus()) { /* print cpus waiting or in xmon */ printf("cpus stopped:"); last_cpu = first_cpu = NR_CPUS; @@ -2571,7 +2571,7 @@ static void dump_pacas(void) termch = c; /* Put c back, it wasn't 'a' */ - if (scanhex(&num)) + if (scanhex(&num) && num < num_possible_cpus()) dump_one_paca(num); else dump_one_paca(xmon_owner); @@ -2668,7 +2668,7 @@ static void dump_xives(void) termch = c; /* Put c back, it wasn't 'a' */ - if (scanhex(&num)) + if (scanhex(&num) && num < num_possible_cpus()) dump_one_xive(num); else dump_one_xive(xmon_owner); -- 2.43.0