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 2B9113AAF49; Thu, 17 Sep 2026 17:56:33 +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=1789667794; cv=none; b=ScYrMabsg6ItxDK/Cxnua6VMeXYeQT89AC5j30eYzHYusBEYuDMwRPLXsIUogHoMEG+BKXnxSyfaipUDbhoMTMiMfjnhL24bU91zENFWMu3ezQ1h7pFC1NV0dUA4IRntgcwfYu206QBGa0v+zanpk7LO7aH5vxTe0kwZ/UUEejk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789667794; c=relaxed/simple; bh=p/yQ8A8JzCbN8lFUVx94PAXzUV90X7rjjfcqJmZo9CM=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CtDi1WLLuSwPGCZbPO+ud7KZHrRq/OZ1sJO8s8MYWSn88A1r7MEbUg2njv3w2bL0u964zjXjvcO9yXkF9mONIUd1AL1o2LNMj6/oT+w0fzgMAPI6niRlJcd2bHiAwn9rnA/qKTMC5FpX8lP4H9E9Az26oPKO/XGdka2M++msk8k= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=iVQqztpu; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="iVQqztpu" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7EBA11F000FF; Thu, 17 Sep 2026 17:56:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789667793; bh=cMuUDMPi3o7l0tsPmxhJ8lKI2sS8zdmHPj836qzbzX0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=iVQqztpuS8K1VUJkwqEAVVAfDdG4AoobdoEbh/WEWuDnAm/7df6YUdVNSyfSjpf71 cc7xOsH2dlJ981u8y76DnAi50cBb8TSd3CfHkU66D3IG9GLXGcDh4hL3MyMGZmXiWF wGQRGFkLsEhuMqsHauGl68dfVZf8COHqamj1SWQ8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, ikaros , "Rafael J. Wysocki" , Sasha Levin Subject: [PATCH 6.12 0173/1102] ACPICA: Enhance buffer validation in acpi_ut_walk_aml_resources() Date: Thu, 17 Sep 2026 16:01:56 +0100 Message-ID: <20260917151543.886041719@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260917151539.408551884@linuxfoundation.org> References: <20260917151539.408551884@linuxfoundation.org> User-Agent: quilt/0.69 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-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: ikaros [ Upstream commit b2e21fe8c3361c3d0d57ee56d359bea9b51fda3d ] Enhance buffer validation in acpi_ut_walk_aml_resources() to prevent buffer overflows. Link: https://github.com/acpica/acpica/commit/975cb20c7992 Signed-off-by: ikaros Signed-off-by: Rafael J. Wysocki Link: https://patch.msgid.link/2481429.NG923GbCHz@rafael.j.wysocki Signed-off-by: Sasha Levin --- drivers/acpi/acpica/utresrc.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/drivers/acpi/acpica/utresrc.c b/drivers/acpi/acpica/utresrc.c index e1cc3d3487508..86ebd9fb869af 100644 --- a/drivers/acpi/acpica/utresrc.c +++ b/drivers/acpi/acpica/utresrc.c @@ -165,6 +165,28 @@ acpi_ut_walk_aml_resources(struct acpi_walk_state *walk_state, /* Walk the byte list, abort on any invalid descriptor type or length */ while (aml < end_aml) { + /* + * Validate that the remaining buffer space can hold enough + * bytes to safely access fields during validation. + * For large resource descriptors (bit 7 set), we need enough + * bytes to access the Type field in serial_bus resources. + * Small resource descriptors only need sizeof(struct aml_resource_end_tag). + */ + if ((acpi_size)(end_aml - aml) < + sizeof(struct aml_resource_end_tag)) { + return_ACPI_STATUS(AE_AML_BUFFER_LENGTH); + } + + /* + * For large resource descriptors, ensure enough space for + * the header plus serial_bus Type field access. + */ + if ((ACPI_GET8(aml) & ACPI_RESOURCE_NAME_LARGE) && + ((acpi_size)(end_aml - aml) < + ACPI_OFFSET(struct aml_resource_common_serialbus, + type) + 1)) { + return_ACPI_STATUS(AE_AML_BUFFER_LENGTH); + } /* Validate the Resource Type and Resource Length */ @@ -182,6 +204,14 @@ acpi_ut_walk_aml_resources(struct acpi_walk_state *walk_state, length = acpi_ut_get_descriptor_length(aml); + /* + * Validate that the descriptor length doesn't exceed the + * remaining buffer size to prevent reading beyond the end. + */ + if (length > (acpi_size)(end_aml - aml)) { + return_ACPI_STATUS(AE_AML_BUFFER_LENGTH); + } + /* Invoke the user function */ if (user_function) { -- 2.53.0