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 4B80B3FB05C; Wed, 20 May 2026 18:25:49 +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=1779301550; cv=none; b=pO/eVmk2L7bD++ZnUWPb1FGkUUcZa60YpLXAhjOrwXQgQg5OAPgApI3iohckUFmrSvnnT8Eamc/qd+N1Pj4zKSd9nNHzWtEi6MKXlnliChn5DsWCD3qt5gsaebGSuW5x/SoCKyqpeZ6CokDQV6LA43vpVCT4iu49ySf82RHnnT0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1779301550; c=relaxed/simple; bh=9DlASsqkdyjSGE94UdQxqhHOp0msXDnwW+HQCr0OEE0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YtL+E/b8uYAdqgEAKcERsfuY4xrvaUgmPAVDSl6kvHDZjbJHqTI0jZrMCBPm6nFwjxzRq277XOxEOizAx0/9V5eIHSqmV6OLrwlrTiHCBEO3SViQlEoPUnTCgLnqNJ3ub8ifycverqhQQvcw+t31dXsbqWs0697zjmyq5E6Dd7E= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=sDWHgyA2; 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="sDWHgyA2" Received: by smtp.kernel.org (Postfix) with ESMTPSA id AEB801F000E9; Wed, 20 May 2026 18:25:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1779301549; bh=6eMVNHlOFSONiUOKGkWEz4JeIptxIqp71zYlm7Vhrew=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=sDWHgyA2241kAJwBbcn7EttHHNE59pg94NmktFrXQlUGdexc+KwLKuqBMTBAFcg7G 8lpVuZ50CqBw8fsH0htvSMdqRbHdXY8sYAgebpoTPyAPJVSI/LZqSZQ40i4Tw4gg5B uZ0dz1vgo1kZll/EazJR/hITTOT7qHofkl/vkt/g= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ronnie Sahlberg , Shyam Prasad N , Tom Talpey , Bharath SM , linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, stable , "Paulo Alcantara (Red Hat)" , Steve French , Alva Lan , Sasha Levin Subject: [PATCH 6.12 596/666] smb: client: fix OOB reads parsing symlink error response Date: Wed, 20 May 2026 18:23:27 +0200 Message-ID: <20260520162124.183837571@linuxfoundation.org> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260520162111.222830634@linuxfoundation.org> References: <20260520162111.222830634@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 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Greg Kroah-Hartman [ Upstream commit 3df690bba28edec865cf7190be10708ad0ddd67e ] When a CREATE returns STATUS_STOPPED_ON_SYMLINK, smb2_check_message() returns success without any length validation, leaving the symlink parsers as the only defense against an untrusted server. symlink_data() walks SMB 3.1.1 error contexts with the loop test "p < end", but reads p->ErrorId at offset 4 and p->ErrorDataLength at offset 0. When the server-controlled ErrorDataLength advances p to within 1-7 bytes of end, the next iteration will read past it. When the matching context is found, sym->SymLinkErrorTag is read at offset 4 from p->ErrorContextData with no check that the symlink header itself fits. smb2_parse_symlink_response() then bounds-checks the substitute name using SMB2_SYMLINK_STRUCT_SIZE as the offset of PathBuffer from iov_base. That value is computed as sizeof(smb2_err_rsp) + sizeof(smb2_symlink_err_rsp), which is correct only when ErrorContextCount == 0. With at least one error context the symlink data sits 8 bytes deeper, and each skipped non-matching context shifts it further by 8 + ALIGN(ErrorDataLength, 8). The check is too short, allowing the substitute name read to run past iov_len. The out-of-bound heap bytes are UTF-16-decoded into the symlink target and returned to userspace via readlink(2). Fix this all up by making the loops test require the full context header to fit, rejecting sym if its header runs past end, and bound the substitute name against the actual position of sym->PathBuffer rather than a fixed offset. Because sub_offs and sub_len are 16bits, the pointer math will not overflow here with the new greater-than. Cc: Ronnie Sahlberg Cc: Shyam Prasad N Cc: Tom Talpey Cc: Bharath SM Cc: linux-cifs@vger.kernel.org Cc: samba-technical@lists.samba.org Cc: stable Reviewed-by: Paulo Alcantara (Red Hat) Assisted-by: gregkh_clanker_t1000 Signed-off-by: Greg Kroah-Hartman Signed-off-by: Steve French Signed-off-by: Alva Lan Signed-off-by: Sasha Levin --- fs/smb/client/smb2file.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) diff --git a/fs/smb/client/smb2file.c b/fs/smb/client/smb2file.c index 35d2933982d31..fd331a9f2f4d2 100644 --- a/fs/smb/client/smb2file.c +++ b/fs/smb/client/smb2file.c @@ -27,10 +27,11 @@ static struct smb2_symlink_err_rsp *symlink_data(const struct kvec *iov) { struct smb2_err_rsp *err = iov->iov_base; struct smb2_symlink_err_rsp *sym = ERR_PTR(-EINVAL); + u8 *end = (u8 *)err + iov->iov_len; u32 len; if (err->ErrorContextCount) { - struct smb2_error_context_rsp *p, *end; + struct smb2_error_context_rsp *p; len = (u32)err->ErrorContextCount * (offsetof(struct smb2_error_context_rsp, ErrorContextData) + @@ -39,8 +40,7 @@ static struct smb2_symlink_err_rsp *symlink_data(const struct kvec *iov) return ERR_PTR(-EINVAL); p = (struct smb2_error_context_rsp *)err->ErrorData; - end = (struct smb2_error_context_rsp *)((u8 *)err + iov->iov_len); - do { + while ((u8 *)p + sizeof(*p) <= end) { if (le32_to_cpu(p->ErrorId) == SMB2_ERROR_ID_DEFAULT) { sym = (struct smb2_symlink_err_rsp *)p->ErrorContextData; break; @@ -50,14 +50,16 @@ static struct smb2_symlink_err_rsp *symlink_data(const struct kvec *iov) len = ALIGN(le32_to_cpu(p->ErrorDataLength), 8); p = (struct smb2_error_context_rsp *)(p->ErrorContextData + len); - } while (p < end); + } } else if (le32_to_cpu(err->ByteCount) >= sizeof(*sym) && iov->iov_len >= SMB2_SYMLINK_STRUCT_SIZE) { sym = (struct smb2_symlink_err_rsp *)err->ErrorData; } - if (!IS_ERR(sym) && (le32_to_cpu(sym->SymLinkErrorTag) != SYMLINK_ERROR_TAG || - le32_to_cpu(sym->ReparseTag) != IO_REPARSE_TAG_SYMLINK)) + if (!IS_ERR(sym) && + ((u8 *)sym + sizeof(*sym) > end || + le32_to_cpu(sym->SymLinkErrorTag) != SYMLINK_ERROR_TAG || + le32_to_cpu(sym->ReparseTag) != IO_REPARSE_TAG_SYMLINK)) sym = ERR_PTR(-EINVAL); return sym; @@ -82,8 +84,10 @@ int smb2_parse_symlink_response(struct cifs_sb_info *cifs_sb, const struct kvec print_len = le16_to_cpu(sym->PrintNameLength); print_offs = le16_to_cpu(sym->PrintNameOffset); - if (iov->iov_len < SMB2_SYMLINK_STRUCT_SIZE + sub_offs + sub_len || - iov->iov_len < SMB2_SYMLINK_STRUCT_SIZE + print_offs + print_len) + if ((char *)sym->PathBuffer + sub_offs + sub_len > + (char *)iov->iov_base + iov->iov_len || + (char *)sym->PathBuffer + print_offs + print_len > + (char *)iov->iov_base + iov->iov_len) return -EINVAL; return smb2_parse_native_symlink(path, -- 2.53.0