Attachment 18420 Details for Bug 15699 – cherry-picked fix for 4.20-test

[patch] cherry-picked fix for 4.20-test

smb2_ioctl-fix-truncated-FSCTL_QUERY_ALLOCATED_RANGE_420t.patch (text/plain), 5.77 KB, created by David Disseldorp on 2024-08-29 00:20:50 UTC

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Creator: David Disseldorp

Created: 2024-08-29 00:20:50 UTC

Size: 5.77 KB

patch

obsolete

>From a5e7b56de4428e6d286bd5f4cd00777fd8be4212 Mon Sep 17 00:00:00 2001
>From: David Disseldorp <ddiss@samba.org>
>Date: Fri, 23 Aug 2024 12:55:58 +0000
>Subject: [PATCH] smb2_ioctl: fix truncated FSCTL_QUERY_ALLOCATED_RANGES
> responses
>
>As per MS-FSA 2.1.5.10.22 FSCTL_QUERY_ALLOCATED_RANGES, if response
>range entries exceed in_max_output, then we should respond with
>STATUS_BUFFER_OVERFLOW and a truncated output buffer.
>
>Bug: https://bugzilla.samba.org/show_bug.cgi?id=15699
>
>Reported-by: David Howells <dhowells@redhat.com>
>Signed-off-by: David Disseldorp <ddiss@samba.org>
>Reviewed-by: Noel Power <npower@samba.org>
>
>Autobuild-User(master): David Disseldorp <ddiss@samba.org>
>Autobuild-Date(master): Wed Aug 28 08:54:11 UTC 2024 on atb-devel-224
>
>(cherry picked from commit 5e278a52646a48e3671270e5b57ec5b852f9fb4b)
>---
> source3/smbd/smb2_ioctl.c         |  4 ++-
> source3/smbd/smb2_ioctl_filesys.c | 54 +++++++++++++++++++------------
> source4/libcli/smb2/ioctl.c       |  3 +-
> 3 files changed, 38 insertions(+), 23 deletions(-)
>
>diff --git a/source3/smbd/smb2_ioctl.c b/source3/smbd/smb2_ioctl.c
>index 7d0f11df1ad..e31627126f4 100644
>--- a/source3/smbd/smb2_ioctl.c
>+++ b/source3/smbd/smb2_ioctl.c
>@@ -268,7 +268,8 @@ static bool smbd_smb2_ioctl_is_failure(uint32_t ctl_code, NTSTATUS status,
> 	if (NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)
> 	 && ((ctl_code == FSCTL_PIPE_TRANSCEIVE)
> 	  || (ctl_code == FSCTL_PIPE_PEEK)
>-	  || (ctl_code == FSCTL_DFS_GET_REFERRALS))) {
>+	  || (ctl_code == FSCTL_DFS_GET_REFERRALS)
>+	  || (ctl_code == FSCTL_QUERY_ALLOCATED_RANGES))) {
> 		return false;
> 	}
> 
>@@ -344,6 +345,7 @@ static void smbd_smb2_request_ioctl_done(struct tevent_req *subreq)
> 		 * in:
> 		 * - fsctl_dfs_get_refers()
> 		 * - smbd_smb2_ioctl_pipe_read_done()
>+		 * - fsctl_qar()
> 		 */
> 		status = NT_STATUS_BUFFER_TOO_SMALL;
> 	}
>diff --git a/source3/smbd/smb2_ioctl_filesys.c b/source3/smbd/smb2_ioctl_filesys.c
>index 6cc53d4828e..1a8d1c2affa 100644
>--- a/source3/smbd/smb2_ioctl_filesys.c
>+++ b/source3/smbd/smb2_ioctl_filesys.c
>@@ -3,7 +3,7 @@
>    Core SMB2 server
> 
>    Copyright (C) Stefan Metzmacher 2009
>-   Copyright (C) David Disseldorp 2013-2015
>+   Copyright (C) David Disseldorp 2013-2024
> 
>    This program is free software; you can redistribute it and/or modify
>    it under the terms of the GNU General Public License as published by
>@@ -538,6 +538,7 @@ static NTSTATUS fsctl_qar_seek_fill(TALLOC_CTX *mem_ctx,
> 				    struct files_struct *fsp,
> 				    off_t curr_off,
> 				    off_t max_off,
>+				    size_t in_max_output,
> 				    DATA_BLOB *qar_array_blob)
> {
> 	NTSTATUS status = NT_STATUS_NOT_SUPPORTED;
>@@ -578,6 +579,17 @@ static NTSTATUS fsctl_qar_seek_fill(TALLOC_CTX *mem_ctx,
> 			return NT_STATUS_INTERNAL_ERROR;
> 		}
> 
>+		if (qar_array_blob->length + sizeof(qar_buf) > in_max_output) {
>+			/*
>+			 * Earlier check ensures space for one range or more.
>+			 * Subsequent overflow results in a truncated response.
>+			 */
>+			DBG_NOTICE("truncated QAR output: need > %zu, max %zu\n",
>+				qar_array_blob->length + sizeof(qar_buf),
>+				in_max_output);
>+			return STATUS_BUFFER_OVERFLOW;
>+		}
>+
> 		qar_buf.file_off = data_off;
> 		/* + 1 to convert maximum offset to length */
> 		qar_buf.len = MIN(hole_off, max_off + 1) - data_off;
>@@ -652,6 +664,13 @@ static NTSTATUS fsctl_qar(TALLOC_CTX *mem_ctx,
> 		return NT_STATUS_INVALID_PARAMETER;
> 	}
> 
>+	/* must have enough space for at least one range */
>+	if (in_max_output < sizeof(struct file_alloced_range_buf)) {
>+		DEBUG(2, ("QAR max %lu insufficient for one range\n",
>+			  (unsigned long)in_max_output));
>+		return NT_STATUS_BUFFER_TOO_SMALL;
>+	}
>+
> 	/*
> 	 * Maximum offset is either the last valid offset _before_ EOF, or the
> 	 * last byte offset within the requested range. -1 converts length to
>@@ -687,31 +706,24 @@ static NTSTATUS fsctl_qar(TALLOC_CTX *mem_ctx,
> 		status = fsctl_qar_buf_push(mem_ctx, &qar_buf, &qar_array_blob);
> 	} else {
> 		status = fsctl_qar_seek_fill(mem_ctx, fsp, qar_req.buf.file_off,
>-					     max_off, &qar_array_blob);
>-	}
>-	if (!NT_STATUS_IS_OK(status)) {
>-		return status;
>+					     max_off, in_max_output,
>+					     &qar_array_blob);
> 	}
> 
>-	/* marshall response buffer. */
>-	qar_rsp.far_buf_array = qar_array_blob;
>+	if (NT_STATUS_IS_OK(status)
>+	 || NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)) {
>+		/* marshall response. STATUS_BUFFER_OVERFLOW=truncated */
>+		qar_rsp.far_buf_array = qar_array_blob;
> 
>-	ndr_ret = ndr_push_struct_blob(out_output, mem_ctx, &qar_rsp,
>-		(ndr_push_flags_fn_t)ndr_push_fsctl_query_alloced_ranges_rsp);
>-	if (ndr_ret != NDR_ERR_SUCCESS) {
>-		DEBUG(0, ("failed to marshall QAR rsp\n"));
>-		return NT_STATUS_INVALID_PARAMETER;
>-	}
>-
>-	if (out_output->length > in_max_output) {
>-		DEBUG(2, ("QAR output len %lu exceeds max %lu\n",
>-			  (unsigned long)out_output->length,
>-			  (unsigned long)in_max_output));
>-		data_blob_free(out_output);
>-		return NT_STATUS_BUFFER_TOO_SMALL;
>+		ndr_ret = ndr_push_struct_blob(out_output, mem_ctx, &qar_rsp,
>+		 (ndr_push_flags_fn_t)ndr_push_fsctl_query_alloced_ranges_rsp);
>+		if (ndr_ret != NDR_ERR_SUCCESS) {
>+			DEBUG(0, ("failed to marshall QAR rsp\n"));
>+			return NT_STATUS_INVALID_PARAMETER;
>+		}
> 	}
> 
>-	return NT_STATUS_OK;
>+	return status;
> }
> 
> static void smb2_ioctl_filesys_dup_extents_done(struct tevent_req *subreq);
>diff --git a/source4/libcli/smb2/ioctl.c b/source4/libcli/smb2/ioctl.c
>index fe74dfecd8e..94962691810 100644
>--- a/source4/libcli/smb2/ioctl.c
>+++ b/source4/libcli/smb2/ioctl.c
>@@ -86,7 +86,8 @@ static bool smb2_ioctl_is_failure(uint32_t ctl_code, NTSTATUS status,
> 	if (NT_STATUS_EQUAL(status, STATUS_BUFFER_OVERFLOW)
> 	 && ((ctl_code == FSCTL_PIPE_TRANSCEIVE)
> 	  || (ctl_code == FSCTL_PIPE_PEEK)
>-	  || (ctl_code == FSCTL_DFS_GET_REFERRALS))) {
>+	  || (ctl_code == FSCTL_DFS_GET_REFERRALS)
>+	  || (ctl_code == FSCTL_QUERY_ALLOCATED_RANGES))) {
> 		return false;
> 	}
> 
>-- 
>2.43.0
>

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Attachments on bug 15699: 18419 | 18420 | 18421 | 18423 | 18424