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 4FCF5349CD7; Sat, 12 Sep 2026 07:48:18 +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=1789199299; cv=none; b=kXClqd6YDQ4ZqbV9ksr9xiEmnYeM6fZSrVIRCkhj9NBvsLkGox9gNQDa3bmQnDbVy151W22yog6B8bgefIWmgAdqSyL3Q6YSsWVaRb7Ush4cvbqK7D6BkDe8Ey6UGAyF8SSLbtvxyo6Y2cq3G4sYpUXFguVAY3vJrqZenVM6MJ0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789199299; c=relaxed/simple; bh=KKdOkTLQNomVFyKWMdL3cF5MJ2hgQa1L9TaeQRiWp14=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=W2pcGYt8Q6C1hG1zsPxMGT6pb23N4c5ikn9Y96+HcaoyqI33z6QyqLYkq08TxktxHMpkPxFMliLI57lXamarQbudrXibAjsy4ngsqUhUSMyF1oUYV4DEzBfY2Y3i/Uh+O81G3ow1U/vkpy5B8I5yqEscsbSB7tXQ2mZOxgkF2lQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=eDfb9/mk; 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="eDfb9/mk" Received: by smtp.kernel.org (Postfix) with ESMTPSA id DB76D1F000FF; Sat, 12 Sep 2026 07:48:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789199298; bh=msMldZve0DqepgFltWiklgyBv8B/Uft80UZHkgPTBvI=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=eDfb9/mkdxiXL5UCUwwfzgoWpT4t6QYubZN6vy3a6hRBfPuN2oD1aB8jzQ1pTrNq6 6vZh7WsG4irDsS3r/0Zyxt9tCVkapRRZ3eVVjRj1zakCouaIL7jO6o0n0aceSeKrLC A9ONhpITXmcELe8mRiB0RzmG7XvnMyFwV54LIhTo= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Pengpeng Hou , "Rafael J. Wysocki" , Sasha Levin Subject: [PATCH 7.2 0557/1815] ACPI: processor: validate MADT IOAPIC entry bounds Date: Sat, 12 Sep 2026 08:38:27 +0200 Message-ID: <20260912065701.958787434@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065648.999753832@linuxfoundation.org> References: <20260912065648.999753832@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 7.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Pengpeng Hou [ Upstream commit 2c50ffdc73f3a70d745d249f509fc290754121e6 ] The IOAPIC hotplug lookup parses both MADT and _MAT records directly. The MADT walk previously used a subtable's declared length to advance the cursor after only locating a generic header. The _MAT path likewise passed a generic header to the IOAPIC helper. Validate that a current record has a complete generic header, that its declared length is contained in the available record range, and that a typed IOAPIC record contains the full fixed IOAPIC body before reading its fields. Use the same relation for both MADT and _MAT provider paths. Fixes: ecf5636dcd59 ("ACPI: Add interfaces to parse IOAPIC ID for IOAPIC hotplug") Signed-off-by: Pengpeng Hou Link: https://patch.msgid.link/20260715083253.22831-1-pengpeng@iscas.ac.cn Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin --- drivers/acpi/processor_core.c | 31 +++++++++++++++++++++++++------ 1 file changed, 25 insertions(+), 6 deletions(-) diff --git a/drivers/acpi/processor_core.c b/drivers/acpi/processor_core.c index a4498357bd165..3bf076c150fa1 100644 --- a/drivers/acpi/processor_core.c +++ b/drivers/acpi/processor_core.c @@ -336,11 +336,26 @@ int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id) EXPORT_SYMBOL_GPL(acpi_get_cpuid); #ifdef CONFIG_ACPI_HOTPLUG_IOAPIC -static int get_ioapic_id(struct acpi_subtable_header *entry, u32 gsi_base, +static bool madt_entry_is_valid(struct acpi_subtable_header *entry, + unsigned long end) +{ + unsigned long start = (unsigned long)entry; + + if (start >= end || end - start < sizeof(*entry)) + return false; + + return entry->length >= sizeof(*entry) && entry->length <= end - start; +} + +static int get_ioapic_id(struct acpi_subtable_header *entry, + const unsigned long end, u32 gsi_base, u64 *phys_addr, int *ioapic_id) { struct acpi_madt_io_apic *ioapic = (struct acpi_madt_io_apic *)entry; + if (!madt_entry_is_valid(entry, end) || BAD_MADT_ENTRY(ioapic, end)) + return 0; + if (ioapic->global_irq_base != gsi_base) return 0; @@ -361,17 +376,19 @@ static int parse_madt_ioapic_entry(u32 gsi_base, u64 *phys_addr) return apic_id; entry = (unsigned long)madt; + if (madt->header.length < sizeof(*madt)) + return apic_id; madt_end = entry + madt->header.length; /* Parse all entries looking for a match. */ entry += sizeof(struct acpi_table_madt); - while (entry + sizeof(struct acpi_subtable_header) < madt_end) { + while (madt_entry_is_valid((struct acpi_subtable_header *)entry, + madt_end)) { hdr = (struct acpi_subtable_header *)entry; if (hdr->type == ACPI_MADT_TYPE_IO_APIC && - get_ioapic_id(hdr, gsi_base, phys_addr, &apic_id)) + get_ioapic_id(hdr, madt_end, gsi_base, phys_addr, &apic_id)) break; - else - entry += hdr->length; + entry += hdr->length; } return apic_id; @@ -398,7 +415,9 @@ static int parse_mat_ioapic_entry(acpi_handle handle, u32 gsi_base, header = (struct acpi_subtable_header *)obj->buffer.pointer; if (header->type == ACPI_MADT_TYPE_IO_APIC) - get_ioapic_id(header, gsi_base, phys_addr, &apic_id); + get_ioapic_id(header, + (unsigned long)header + obj->buffer.length, + gsi_base, phys_addr, &apic_id); exit: kfree(buffer.pointer); -- 2.53.0