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 E5A5F2AE8D; Tue, 11 Nov 2025 00:51:20 +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=1762822281; cv=none; b=FHBIOcrJpxr4SE7Vtjf8OseajlH4DAhY92FHVMOtPf00LsmUlz6hFv4GsmmF+L/sX/fuALur0XV6g2JhctxQrPgYQGw7T0hUN5DS/HC6ONV2K8vlyt5bhanCf2Fy+s7KBG80jOmn4ieiiDiegpnEKunDtOwzGZxE7LYrWclklUE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762822281; c=relaxed/simple; bh=i2Nx3nqJDnBrgRUCsNFk6F6e08Pavyxwiql55jpyk0g=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=mgO7u4VEzmftT99zqEyRL+NsmrQ1UyDmjs/qKFaLMaeRiwCUzrjVJfxdlMhKf6+Q6A3hBpzYof3A4LjFEMMnp1DsJnnru5cNLTuMEdWGiefYZ1HNx9u9VtZZ/E0+L8/wC0k7lOJm04BwyP1ziZNmrSVWTFDWHFVbvx5R71ibefk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=RaqAAkpR; 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="RaqAAkpR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6CE1EC19421; Tue, 11 Nov 2025 00:51:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1762822280; bh=i2Nx3nqJDnBrgRUCsNFk6F6e08Pavyxwiql55jpyk0g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=RaqAAkpRCjFUcoVHET1y4dIa2pxIDv51drU9+/XsJ2RnO9WwVUnJ6pbLSzvMtdjXT z0TPKSWGX1tTNODRGi2ex1LDOb8UIQf85kdaelGa1LXBMrjaLDX+dKP6PKYhXhDI30 9l4fMgFW4B2P3wuzpt79MMxwXd5eoEIVIZS8XZY4= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Petr Oros , Ivan Vecera , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.17 072/849] tools: ynl: fix string attribute length to include null terminator Date: Tue, 11 Nov 2025 09:34:02 +0900 Message-ID: <20251111004538.165431249@linuxfoundation.org> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20251111004536.460310036@linuxfoundation.org> References: <20251111004536.460310036@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 6.17-stable review patch. If anyone has any objections, please let me know. ------------------ From: Petr Oros [ Upstream commit 65f9c4c5888913c2cf5d2fc9454c83f9930d537d ] The ynl_attr_put_str() function was not including the null terminator in the attribute length calculation. This caused kernel to reject CTRL_CMD_GETFAMILY requests with EINVAL: "Attribute failed policy validation". For a 4-character family name like "dpll": - Sent: nla_len=8 (4 byte header + 4 byte string without null) - Expected: nla_len=9 (4 byte header + 5 byte string with null) The bug was introduced in commit 15d2540e0d62 ("tools: ynl: check for overflow of constructed messages") when refactoring from stpcpy() to strlen(). The original code correctly included the null terminator: end = stpcpy(ynl_attr_data(attr), str); attr->nla_len = NLA_HDRLEN + NLA_ALIGN(end - (char *)ynl_attr_data(attr)); Since stpcpy() returns a pointer past the null terminator, the length included it. The refactored version using strlen() omitted the +1. The fix also removes NLA_ALIGN() from nla_len calculation, since nla_len should contain actual attribute length, not aligned length. Alignment is only for calculating next attribute position. This makes the code consistent with ynl_attr_put(). CTRL_ATTR_FAMILY_NAME uses NLA_NUL_STRING policy which requires null terminator. Kernel validates with memchr() and rejects if not found. Fixes: 15d2540e0d62 ("tools: ynl: check for overflow of constructed messages") Signed-off-by: Petr Oros Tested-by: Ivan Vecera Reviewed-by: Ivan Vecera Link: https://lore.kernel.org/20251018151737.365485-3-zahari.doychev@linux.com Link: https://patch.msgid.link/20251024132438.351290-1-poros@redhat.com Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- tools/net/ynl/lib/ynl-priv.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/net/ynl/lib/ynl-priv.h b/tools/net/ynl/lib/ynl-priv.h index 824777d7e05ea..fca519d7ec9a7 100644 --- a/tools/net/ynl/lib/ynl-priv.h +++ b/tools/net/ynl/lib/ynl-priv.h @@ -314,7 +314,7 @@ ynl_attr_put_str(struct nlmsghdr *nlh, unsigned int attr_type, const char *str) struct nlattr *attr; size_t len; - len = strlen(str); + len = strlen(str) + 1; if (__ynl_attr_put_overflow(nlh, len)) return; @@ -322,7 +322,7 @@ ynl_attr_put_str(struct nlmsghdr *nlh, unsigned int attr_type, const char *str) attr->nla_type = attr_type; strcpy((char *)ynl_attr_data(attr), str); - attr->nla_len = NLA_HDRLEN + NLA_ALIGN(len); + attr->nla_len = NLA_HDRLEN + len; nlh->nlmsg_len += NLMSG_ALIGN(attr->nla_len); } -- 2.51.0