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 B2716221DB6; Fri, 24 Apr 2026 13:42:20 +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=1777038140; cv=none; b=J6v1rfjf8L/PSZ3qzJ/6FAaBIbE6McRwTk9/1/eU4wfH4fHCeetMu68LBgdzMD8BSvlGjOfnTWDlhCYe90Fe4yDQ1PsQQua5KY6PyM2y2h1aKoBkwNtq/9ESHlieSE+JYJ+4n2H71+czbYbzUFD3dEwfPASI7TiFwkzK2S8NPJ0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777038140; c=relaxed/simple; bh=+GOXf6BDeMkYM6Y7AxK+V9UL091KfenP/FQCd05r4DA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=a2mXRZdbOs2fV3/NDtZbrjVPbVqA/jWGMdPQsbBvV9BBoML60fkB0gigYeiJ4bOaTj+zUbhVTH5UxeRO54foBgpqx6Tsi37w4UEnrod4vwZ9snNKOto9tH3Ym9//MHYUmeYRwnCbuVrgStScAPQY1I19S+OoL7v0DUGisVydrek= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=qxSNpGhi; 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="qxSNpGhi" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 46EBEC19425; Fri, 24 Apr 2026 13:42:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1777038140; bh=+GOXf6BDeMkYM6Y7AxK+V9UL091KfenP/FQCd05r4DA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qxSNpGhirTy+7KzDs8HbnB/Lp1DccgjqnfNhjVQBr4AKEV5259Vbm1vaQhdoGdJo7 7oQiGkkW0AE5bq1cyW9SqwUERqyuIFEwGXKjCx86d8g4poP7S4JmkAllzAoMV8qTWi 8e0hC+mKW83SY49SdyVlu/COlJSRUjoL5UKcGIms= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Michael Bommarito , Steve French Subject: [PATCH 6.18 40/55] smb: client: fix OOB read in smb2_ioctl_query_info QUERY_INFO path Date: Fri, 24 Apr 2026 15:31:19 +0200 Message-ID: <20260424132438.329903672@linuxfoundation.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260424132430.006424517@linuxfoundation.org> References: <20260424132430.006424517@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 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Michael Bommarito commit a58c5af19ff0d6f44f6e9fe31e33a2c92223f77e upstream. smb2_ioctl_query_info() has two response-copy branches: PASSTHRU_FSCTL and the default QUERY_INFO path. The QUERY_INFO branch clamps qi.input_buffer_length to the server-reported OutputBufferLength and then copies qi.input_buffer_length bytes from qi_rsp->Buffer to userspace, but it never verifies that the flexible-array payload actually fits within rsp_iov[1].iov_len. A malicious server can return OutputBufferLength larger than the actual QUERY_INFO response, causing copy_to_user() to walk past the response buffer and expose adjacent kernel heap to userspace. Guard the QUERY_INFO copy with a bounds check on the actual Buffer payload. Use struct_size(qi_rsp, Buffer, qi.input_buffer_length) rather than an open-coded addition so the guard cannot overflow on 32-bit builds. Fixes: f5778c398713 ("SMB3: Allow SMB3 FSCTL queries to be sent to server from tools") Cc: stable@vger.kernel.org Signed-off-by: Michael Bommarito Assisted-by: Claude:claude-opus-4-6 Assisted-by: Codex:gpt-5-4 Signed-off-by: Steve French Signed-off-by: Greg Kroah-Hartman --- fs/smb/client/smb2ops.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/fs/smb/client/smb2ops.c +++ b/fs/smb/client/smb2ops.c @@ -1775,6 +1775,12 @@ replay_again: qi_rsp = (struct smb2_query_info_rsp *)rsp_iov[1].iov_base; if (le32_to_cpu(qi_rsp->OutputBufferLength) < qi.input_buffer_length) qi.input_buffer_length = le32_to_cpu(qi_rsp->OutputBufferLength); + if (qi.input_buffer_length > 0 && + struct_size(qi_rsp, Buffer, qi.input_buffer_length) > + rsp_iov[1].iov_len) { + rc = -EFAULT; + goto out; + } if (copy_to_user(&pqi->input_buffer_length, &qi.input_buffer_length, sizeof(qi.input_buffer_length))) {