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 C0760BA49 for ; Tue, 7 Mar 2023 18:41:32 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3E992C4339B; Tue, 7 Mar 2023 18:41:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1678214492; bh=ptUXAPSvKVdNzlGHldFCM5Ift2vs69raehMY7ZpgmEA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=GBZePL9lrIIm0xdQet9XqWBKIlawAqrUOvk574qGK9hP3eIWNS+0DLaO5HH4zfBtx M6uquRCwS6i5YE1JclBWQNGn+ees0QcTyAKdsl5s41cLYbvNNKmSNvkxzdKlcE6faV 68u5k51HRmVPYH60WiTgMd3+4jvsD4fTtO9JJwWA= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, "Ilia.Gavrilov" , Kim Phillips , Joerg Roedel Subject: [PATCH 6.1 841/885] iommu/amd: Add a length limitation for the ivrs_acpihid command-line parameter Date: Tue, 7 Mar 2023 18:02:55 +0100 Message-Id: <20230307170038.377534820@linuxfoundation.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230307170001.594919529@linuxfoundation.org> References: <20230307170001.594919529@linuxfoundation.org> User-Agent: quilt/0.67 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 From: Gavrilov Ilia commit b6b26d86c61c441144c72f842f7469bb686e1211 upstream. The 'acpiid' buffer in the parse_ivrs_acpihid function may overflow, because the string specifier in the format string sscanf() has no width limitation. Found by InfoTeCS on behalf of Linux Verification Center (linuxtesting.org) with SVACE. Fixes: ca3bf5d47cec ("iommu/amd: Introduces ivrs_acpihid kernel parameter") Cc: stable@vger.kernel.org Signed-off-by: Ilia.Gavrilov Reviewed-by: Kim Phillips Link: https://lore.kernel.org/r/20230202082719.1513849-1-Ilia.Gavrilov@infotecs.ru Signed-off-by: Joerg Roedel Signed-off-by: Greg Kroah-Hartman --- drivers/iommu/amd/init.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) --- a/drivers/iommu/amd/init.c +++ b/drivers/iommu/amd/init.c @@ -3475,15 +3475,26 @@ found: return 1; } +#define ACPIID_LEN (ACPIHID_UID_LEN + ACPIHID_HID_LEN) + static int __init parse_ivrs_acpihid(char *str) { u32 seg = 0, bus, dev, fn; char *hid, *uid, *p, *addr; - char acpiid[ACPIHID_UID_LEN + ACPIHID_HID_LEN] = {0}; + char acpiid[ACPIID_LEN] = {0}; int i; addr = strchr(str, '@'); if (!addr) { + addr = strchr(str, '='); + if (!addr) + goto not_found; + + ++addr; + + if (strlen(addr) > ACPIID_LEN) + goto not_found; + if (sscanf(str, "[%x:%x.%x]=%s", &bus, &dev, &fn, acpiid) == 4 || sscanf(str, "[%x:%x:%x.%x]=%s", &seg, &bus, &dev, &fn, acpiid) == 5) { pr_warn("ivrs_acpihid%s option format deprecated; use ivrs_acpihid=%s@%04x:%02x:%02x.%d instead\n", @@ -3496,6 +3507,9 @@ static int __init parse_ivrs_acpihid(cha /* We have the '@', make it the terminator to get just the acpiid */ *addr++ = 0; + if (strlen(str) > ACPIID_LEN + 1) + goto not_found; + if (sscanf(str, "=%s", acpiid) != 1) goto not_found;