Attachment 14713 Details for Bug 13688 – Patch for 4.9 backported from master

[patch] Patch for 4.9 backported from master

bug13688-v48,v49.patch (text/plain), 22.62 KB, created by Ralph Böhme on 2018-12-03 11:41:20 UTC

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Creator: Ralph Böhme

Created: 2018-12-03 11:41:20 UTC

Size: 22.62 KB

patch

obsolete

>From 9fd489ddf24ad0d99c57eeb674abbd320250567d Mon Sep 17 00:00:00 2001
>From: Ralph Boehme <slow@samba.org>
>Date: Fri, 23 Nov 2018 10:07:29 +0100
>Subject: [PATCH 1/7] vfs_error_inject: add pwrite
>
>Bug: https://bugzilla.samba.org/show_bug.cgi?id=13688
>
>Signed-off-by: Ralph Boehme <slow@samba.org>
>Reviewed-by: Jeremy Allison <jra@samba.org>
>(cherry picked from commit 55a82f907f6410ff478e82b0cf7f1caeacaf5ddd)
>---
> source3/modules/vfs_error_inject.c | 18 ++++++++++++++++++
> 1 file changed, 18 insertions(+)
>
>diff --git a/source3/modules/vfs_error_inject.c b/source3/modules/vfs_error_inject.c
>index bb5477a449f..9f0a25fb73f 100644
>--- a/source3/modules/vfs_error_inject.c
>+++ b/source3/modules/vfs_error_inject.c
>@@ -88,8 +88,26 @@ static int vfs_error_inject_chdir(vfs_handle_struct *handle,
> 	return SMB_VFS_NEXT_CHDIR(handle, smb_fname);
> }
> 
>+static ssize_t vfs_error_inject_pwrite(vfs_handle_struct *handle,
>+				       files_struct *fsp,
>+				       const void *data,
>+				       size_t n,
>+				       off_t offset)
>+{
>+	int error;
>+
>+	error = inject_unix_error("pwrite", handle);
>+	if (error != 0) {
>+		errno = error;
>+		return -1;
>+	}
>+
>+	return SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
>+}
>+
> static struct vfs_fn_pointers vfs_error_inject_fns = {
> 	.chdir_fn = vfs_error_inject_chdir,
>+	.pwrite_fn = vfs_error_inject_pwrite,
> };
> 
> static_decl_vfs;
>-- 
>2.17.2
>
>
>From 75c9af9542a62884c0419e7e456cb8b2ea430329 Mon Sep 17 00:00:00 2001
>From: Ralph Boehme <slow@samba.org>
>Date: Fri, 23 Nov 2018 10:18:10 +0100
>Subject: [PATCH 2/7] vfs_error_inject: add EBADF error
>
>Bug: https://bugzilla.samba.org/show_bug.cgi?id=13688
>
>Signed-off-by: Ralph Boehme <slow@samba.org>
>Reviewed-by: Jeremy Allison <jra@samba.org>
>(cherry picked from commit 523a9b312c9f09178a5afefb48343e684e41d817)
>---
> source3/modules/vfs_error_inject.c | 1 +
> 1 file changed, 1 insertion(+)
>
>diff --git a/source3/modules/vfs_error_inject.c b/source3/modules/vfs_error_inject.c
>index 9f0a25fb73f..c8c3ea4701f 100644
>--- a/source3/modules/vfs_error_inject.c
>+++ b/source3/modules/vfs_error_inject.c
>@@ -28,6 +28,7 @@ struct unix_error_map {
> 	int error;
> } unix_error_map_array[] = {
> 	{	"ESTALE",	ESTALE	},
>+	{	"EBADF",	EBADF	},
> };
> 
> static int find_unix_error_from_string(const char *err_str)
>-- 
>2.17.2
>
>
>From 8888f962a4ce3b4c3c113de8653a1bc1faae2eca Mon Sep 17 00:00:00 2001
>From: Ralph Boehme <slow@samba.org>
>Date: Wed, 14 Nov 2018 13:45:11 +0100
>Subject: [PATCH 3/7] s4:torture: add a test-suite for VSS
>
>This test will not be run from the main torture test runner in selftest,
>as there we don't pass the required arguments 'twrp_file' and
>'twrp_snapshot'.
>
>The test needs a carefully prepared environment with provisioned
>snapshot data, so the test will be started from a blackbox test
>script. That comes next.
>
>Bug: https://bugzilla.samba.org/show_bug.cgi?id=13688
>
>Signed-off-by: Ralph Boehme <slow@samba.org>
>Reviewed-by: Jeremy Allison <jra@samba.org>
>(cherry picked from commit 48ddb87a32ca44c2fcc5aac0cc28c5527dc7eade)
>---
> source4/torture/smb2/create.c | 87 +++++++++++++++++++++++++++++++++++
> source4/torture/smb2/smb2.c   |  1 +
> 2 files changed, 88 insertions(+)
>
>diff --git a/source4/torture/smb2/create.c b/source4/torture/smb2/create.c
>index ead56eb5c40..68447935bd0 100644
>--- a/source4/torture/smb2/create.c
>+++ b/source4/torture/smb2/create.c
>@@ -1733,6 +1733,82 @@ static bool test_dir_alloc_size(struct torture_context *tctx,
> 	return ret;
> }
> 
>+static bool test_twrp_write(struct torture_context *tctx, struct smb2_tree *tree)
>+{
>+	struct smb2_create io;
>+	struct smb2_handle h1 = {{0}};
>+	NTSTATUS status;
>+	bool ret = true;
>+	char *p = NULL;
>+	struct tm tm;
>+	time_t t;
>+	uint64_t nttime;
>+	const char *file = NULL;
>+	const char *snapshot = NULL;
>+
>+	file = torture_setting_string(tctx, "twrp_file", NULL);
>+	if (file == NULL) {
>+		torture_skip(tctx, "missing 'twrp_file' option\n");
>+	}
>+
>+	snapshot = torture_setting_string(tctx, "twrp_snapshot", NULL);
>+	if (snapshot == NULL) {
>+		torture_skip(tctx, "missing 'twrp_snapshot' option\n");
>+	}
>+
>+	torture_comment(tctx, "Testing timewarp (%s) (%s)\n", file, snapshot);
>+
>+	setenv("TZ", "GMT", 1);
>+	p = strptime(snapshot, "@GMT-%Y.%m.%d-%H.%M.%S", &tm);
>+	torture_assert_goto(tctx, p != NULL, ret, done, "strptime\n");
>+	torture_assert_goto(tctx, *p == '\0', ret, done, "strptime\n");
>+
>+	t = mktime(&tm);
>+	unix_to_nt_time(&nttime, t);
>+
>+	io = (struct smb2_create) {
>+		.in.desired_access = SEC_FILE_READ_DATA,
>+		.in.file_attributes = FILE_ATTRIBUTE_NORMAL,
>+		.in.create_disposition = NTCREATEX_DISP_OPEN,
>+		.in.share_access = NTCREATEX_SHARE_ACCESS_MASK,
>+		.in.fname = file,
>+		.in.query_maximal_access = true,
>+		.in.timewarp = nttime,
>+	};
>+
>+	status = smb2_create(tree, tctx, &io);
>+	torture_assert_ntstatus_ok_goto(tctx, status, ret, done,
>+					"smb2_create\n");
>+	smb2_util_close(tree, io.out.file.handle);
>+
>+	ret = io.out.maximal_access & (SEC_FILE_READ_DATA | SEC_FILE_WRITE_DATA);
>+	torture_assert_goto(tctx, ret, ret, done, "Bad access\n");
>+
>+	io = (struct smb2_create) {
>+		.in.desired_access = SEC_FILE_READ_DATA|SEC_FILE_WRITE_DATA,
>+		.in.file_attributes = FILE_ATTRIBUTE_NORMAL,
>+		.in.create_disposition = NTCREATEX_DISP_OPEN,
>+		.in.share_access = NTCREATEX_SHARE_ACCESS_MASK,
>+		.in.fname = file,
>+		.in.timewarp = nttime,
>+	};
>+
>+	status = smb2_create(tree, tctx, &io);
>+	torture_assert_ntstatus_ok_goto(tctx, status, ret, done,
>+					"smb2_create\n");
>+	h1 = io.out.file.handle;
>+
>+	status = smb2_util_write(tree, h1, "123", 0, 3);
>+	torture_assert_ntstatus_equal_goto(tctx, status,
>+					   NT_STATUS_MEDIA_WRITE_PROTECTED,
>+					   ret, done, "smb2_create\n");
>+
>+	smb2_util_close(tree, h1);
>+
>+done:
>+	return ret;
>+}
>+
> /*
>    basic testing of SMB2 read
> */
>@@ -1758,3 +1834,14 @@ struct torture_suite *torture_smb2_create_init(TALLOC_CTX *ctx)
> 
> 	return suite;
> }
>+
>+struct torture_suite *torture_smb2_twrp_init(TALLOC_CTX *ctx)
>+{
>+	struct torture_suite *suite = torture_suite_create(ctx, "twrp");
>+
>+	torture_suite_add_1smb2_test(suite, "write", test_twrp_write);
>+
>+	suite->description = talloc_strdup(suite, "SMB2-TWRP tests");
>+
>+	return suite;
>+}
>diff --git a/source4/torture/smb2/smb2.c b/source4/torture/smb2/smb2.c
>index 6f9884e3c27..a835dc7c050 100644
>--- a/source4/torture/smb2/smb2.c
>+++ b/source4/torture/smb2/smb2.c
>@@ -154,6 +154,7 @@ NTSTATUS torture_smb2_init(TALLOC_CTX *ctx)
> 	torture_suite_add_suite(suite, torture_smb2_read_init(suite));
> 	torture_suite_add_suite(suite, torture_smb2_aio_delay_init(suite));
> 	torture_suite_add_suite(suite, torture_smb2_create_init(suite));
>+	torture_suite_add_suite(suite, torture_smb2_twrp_init(suite));
> 	torture_suite_add_suite(suite, torture_smb2_acls_init(suite));
> 	torture_suite_add_suite(suite, torture_smb2_notify_init(suite));
> 	torture_suite_add_suite(suite, torture_smb2_notify_inotify_init(suite));
>-- 
>2.17.2
>
>
>From ab1a5c33670d8da4f1d50b8cf03de8c8ca9785d3 Mon Sep 17 00:00:00 2001
>From: Ralph Boehme <slow@samba.org>
>Date: Fri, 23 Nov 2018 10:18:44 +0100
>Subject: [PATCH 4/7] s3:script/tests: add a test for VSS write behaviour
>
>Bug: https://bugzilla.samba.org/show_bug.cgi?id=13688
>
>Signed-off-by: Ralph Boehme <slow@samba.org>
>Reviewed-by: Jeremy Allison <jra@samba.org>
>(backported from commit 12778f015988f7e8755016c72c26939998758dae)
>---
> selftest/knownfail.d/samba3.blackbox          |  1 +
> selftest/target/Samba3.pm                     |  9 +++
> .../script/tests/test_shadow_copy_torture.sh  | 76 +++++++++++++++++++
> source3/selftest/tests.py                     |  1 +
> 4 files changed, 87 insertions(+)
> create mode 100644 selftest/knownfail.d/samba3.blackbox
> create mode 100755 source3/script/tests/test_shadow_copy_torture.sh
>
>diff --git a/selftest/knownfail.d/samba3.blackbox b/selftest/knownfail.d/samba3.blackbox
>new file mode 100644
>index 00000000000..16537e58aeb
>--- /dev/null
>+++ b/selftest/knownfail.d/samba3.blackbox
>@@ -0,0 +1 @@
>+^samba3.blackbox.shadow_copy_torture.writing to shadow copy of a file$fileserver$
>diff --git a/selftest/target/Samba3.pm b/selftest/target/Samba3.pm
>index 438cb3409bb..9e85d229670 100755
>--- a/selftest/target/Samba3.pm
>+++ b/selftest/target/Samba3.pm
>@@ -2134,6 +2134,15 @@ sub provision($$$$$$$$$)
> 	vfs objects = shadow_copy2
> 	shadow:mountpoint = $shadow_mntdir
> 	wide links = yes
>+
>+[shadow_write]
>+	path = $shadow_tstdir
>+	comment = previous versions snapshots under mount point
>+	vfs objects = shadow_copy2 error_inject
>+	aio write size = 0
>+	error_inject:pwrite = EBADF
>+	shadow:mountpoint = $shadow_tstdir
>+
> [dfq]
> 	path = $shrdir/dfree
> 	vfs objects = acl_xattr fake_acls xattr_tdb fake_dfq
>diff --git a/source3/script/tests/test_shadow_copy_torture.sh b/source3/script/tests/test_shadow_copy_torture.sh
>new file mode 100755
>index 00000000000..d47cd512a20
>--- /dev/null
>+++ b/source3/script/tests/test_shadow_copy_torture.sh
>@@ -0,0 +1,76 @@
>+#!/bin/bash
>+#
>+# Blackbox test for shadow_copy2 VFS.
>+#
>+
>+if [ $# -lt 7 ]; then
>+cat <<EOF
>+Usage: test_shadow_copy SERVER SERVER_IP DOMAIN USERNAME PASSWORD WORKDIR SMBTORTURE
>+EOF
>+exit 1;
>+fi
>+
>+SERVER=${1}
>+SERVER_IP=${2}
>+DOMAIN=${3}
>+USERNAME=${4}
>+PASSWORD=${5}
>+WORKDIR=${6}
>+SMBTORTURE="$VALGRIND ${7}"
>+shift 7
>+
>+incdir=`dirname $0`/../../../testprogs/blackbox
>+. $incdir/subunit.sh
>+
>+SNAPSHOT="@GMT-2015.10.31-19.40.30"
>+
>+failed=0
>+
>+# build a hierarchy of files, symlinks, and directories
>+build_files()
>+{
>+    local destdir
>+    destdir=$1
>+
>+    echo "$content" > $destdir/foo
>+}
>+
>+# build a snapshots directory
>+build_snapshots()
>+{
>+    local snapdir
>+
>+    snapdir=$WORKDIR/.snapshots
>+
>+    mkdir -p $snapdir
>+    mkdir $snapdir/$SNAPSHOT
>+
>+    build_files $snapdir/$SNAPSHOT
>+}
>+
>+test_shadow_copy_write()
>+{
>+    local msg
>+
>+    msg=$1
>+
>+    #delete snapshots from previous tests
>+    find $WORKDIR -name ".snapshots" -exec rm -rf {} \; 1>/dev/null 2>&1
>+    build_snapshots
>+
>+    testit "writing to shadow copy of a file" \
>+	   $SMBTORTURE \
>+	   -U$USERNAME%$PASSWORD \
>+	   "//$SERVER/shadow_write" \
>+	   --option="torture:twrp_file=foo" \
>+	   --option="torture:twrp_snapshot=$SNAPSHOT" \
>+	   smb2.twrp.write || \
>+        failed=`expr $failed + 1`
>+}
>+
>+build_files $WORKDIR
>+
>+# test open for writing and write behaviour of snapshoted files
>+test_shadow_copy_write "write behaviour of snapshoted files"
>+
>+exit $failed
>diff --git a/source3/selftest/tests.py b/source3/selftest/tests.py
>index 09cd5159a0d..f91cb5a6cd9 100755
>--- a/source3/selftest/tests.py
>+++ b/source3/selftest/tests.py
>@@ -275,6 +275,7 @@ plantestsuite("samba3.blackbox.smbclient_ntlm.plain (%s)" % env, env, [os.path.j
>     plantestsuite("samba3.blackbox.offline (%s)" % env, env, [os.path.join(samba3srcdir, "script/tests/test_offline.sh"), '$SERVER', '$SERVER_IP', '$DOMAIN', '$USERNAME', '$PASSWORD', '$LOCAL_PATH/offline', smbclient3])
>     plantestsuite("samba3.blackbox.shadow_copy2 NT1 (%s)" % env, env, [os.path.join(samba3srcdir, "script/tests/test_shadow_copy.sh"), '$SERVER', '$SERVER_IP', '$DOMAIN', '$USERNAME', '$PASSWORD', '$LOCAL_PATH/shadow', smbclient3, '-m', 'NT1'])
>     plantestsuite("samba3.blackbox.shadow_copy2 SMB3 (%s)" % env, env, [os.path.join(samba3srcdir, "script/tests/test_shadow_copy.sh"), '$SERVER', '$SERVER_IP', '$DOMAIN', '$USERNAME', '$PASSWORD', '$LOCAL_PATH/shadow', smbclient3, '-m', 'SMB3'])
>+    plantestsuite("samba3.blackbox.shadow_copy_torture", env, [os.path.join(samba3srcdir, "script/tests/test_shadow_copy_torture.sh"), '$SERVER', '$SERVER_IP', '$DOMAIN', '$USERNAME', '$PASSWORD', '$LOCAL_PATH/shadow', smbtorture4])
>     plantestsuite("samba3.blackbox.smbclient.forceuser_validusers (%s)" % env, env, [os.path.join(samba3srcdir, "script/tests/test_forceuser_validusers.sh"), '$SERVER', '$DOMAIN', '$USERNAME', '$PASSWORD', '$LOCAL_PATH', smbclient3])
>     plantestsuite("samba3.blackbox.smbget (%s)" % env, env, [os.path.join(samba3srcdir, "script/tests/test_smbget.sh"), '$SERVER', '$SERVER_IP', '$DOMAIN', 'smbget_user', '$PASSWORD', '$LOCAL_PATH/smbget', smbget])
>     plantestsuite("samba3.blackbox.netshareenum (%s)" % env, env, [os.path.join(samba3srcdir, "script/tests/test_shareenum.sh"), '$SERVER', '$USERNAME', '$PASSWORD', rpcclient])
>-- 
>2.17.2
>
>
>From 9834c64404b68646c693c84fae50611dfc3ceb01 Mon Sep 17 00:00:00 2001
>From: Ralph Boehme <slow@samba.org>
>Date: Thu, 22 Nov 2018 11:02:24 +0100
>Subject: [PATCH 5/7] vfs_shadow_copy2: add _already_converted arg to
> shadow_copy2_strip_snapshot_internal()
>
>Not used for now, all existing callers pass NULL.
>
>Bug: https://bugzilla.samba.org/show_bug.cgi?id=13688
>
>Signed-off-by: Ralph Boehme <slow@samba.org>
>Reviewed-by: Jeremy Allison <jra@samba.org>
>(cherry picked from commit 87bf06ed790dad8a4f650c0cd1b6781864666cbf)
>---
> source3/modules/vfs_shadow_copy2.c | 32 ++++++++++++++++++++++--------
> 1 file changed, 24 insertions(+), 8 deletions(-)
>
>diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
>index aa7cd9c61d0..c7fc5ee4550 100644
>--- a/source3/modules/vfs_shadow_copy2.c
>+++ b/source3/modules/vfs_shadow_copy2.c
>@@ -587,7 +587,8 @@ static bool shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
> 					const char *orig_name,
> 					time_t *ptimestamp,
> 					char **pstripped,
>-					char **psnappath)
>+					char **psnappath,
>+					bool *_already_converted)
> {
> 	struct tm tm;
> 	time_t timestamp = 0;
>@@ -608,6 +609,10 @@ static bool shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
> 
> 	DEBUG(10, (__location__ ": enter path '%s'\n", name));
> 
>+	if (_already_converted != NULL) {
>+		*_already_converted = false;
>+	}
>+
> 	abs_path = make_path_absolute(mem_ctx, priv, name);
> 	if (abs_path == NULL) {
> 		ret = false;
>@@ -630,6 +635,9 @@ static bool shadow_copy2_strip_snapshot_internal(TALLOC_CTX *mem_ctx,
> 	}
> 
> 	if (already_converted) {
>+		if (_already_converted != NULL) {
>+			*_already_converted = true;
>+		}
> 		goto out;
> 	}
> 
>@@ -759,6 +767,7 @@ static bool shadow_copy2_strip_snapshot(TALLOC_CTX *mem_ctx,
> 					orig_name,
> 					ptimestamp,
> 					pstripped,
>+					NULL,
> 					NULL);
> }
> 
>@@ -1119,12 +1128,14 @@ static int shadow_copy2_rename(vfs_handle_struct *handle,
> 
> 	if (!shadow_copy2_strip_snapshot_internal(talloc_tos(), handle,
> 					 smb_fname_src->base_name,
>-					 &timestamp_src, NULL, &snappath_src)) {
>+					 &timestamp_src, NULL, &snappath_src,
>+					 NULL)) {
> 		return -1;
> 	}
> 	if (!shadow_copy2_strip_snapshot_internal(talloc_tos(), handle,
> 					 smb_fname_dst->base_name,
>-					 &timestamp_dst, NULL, &snappath_dst)) {
>+					 &timestamp_dst, NULL, &snappath_dst,
>+					 NULL)) {
> 		return -1;
> 	}
> 	if (timestamp_src != 0) {
>@@ -1163,7 +1174,8 @@ static int shadow_copy2_symlink(vfs_handle_struct *handle,
> 				link_contents,
> 				&timestamp_old,
> 				NULL,
>-				&snappath_old)) {
>+				&snappath_old,
>+				NULL)) {
> 		return -1;
> 	}
> 	if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
>@@ -1171,7 +1183,8 @@ static int shadow_copy2_symlink(vfs_handle_struct *handle,
> 				new_smb_fname->base_name,
> 				&timestamp_new,
> 				NULL,
>-				&snappath_new)) {
>+				&snappath_new,
>+				NULL)) {
> 		return -1;
> 	}
> 	if ((timestamp_old != 0) || (timestamp_new != 0)) {
>@@ -1202,7 +1215,8 @@ static int shadow_copy2_link(vfs_handle_struct *handle,
> 				old_smb_fname->base_name,
> 				&timestamp_old,
> 				NULL,
>-				&snappath_old)) {
>+				&snappath_old,
>+				NULL)) {
> 		return -1;
> 	}
> 	if (!shadow_copy2_strip_snapshot_internal(talloc_tos(),
>@@ -1210,7 +1224,8 @@ static int shadow_copy2_link(vfs_handle_struct *handle,
> 				new_smb_fname->base_name,
> 				&timestamp_new,
> 				NULL,
>-				&snappath_new)) {
>+				&snappath_new,
>+				NULL)) {
> 		return -1;
> 	}
> 	if ((timestamp_old != 0) || (timestamp_new != 0)) {
>@@ -1566,7 +1581,8 @@ static int shadow_copy2_chdir(vfs_handle_struct *handle,
> 					smb_fname->base_name,
> 					&timestamp,
> 					&stripped,
>-					&snappath)) {
>+					&snappath,
>+					NULL)) {
> 		return -1;
> 	}
> 	if (stripped != NULL) {
>-- 
>2.17.2
>
>
>From f072056b544def6e26dea9326d5dd2ecf066ca71 Mon Sep 17 00:00:00 2001
>From: Ralph Boehme <slow@samba.org>
>Date: Thu, 22 Nov 2018 11:04:54 +0100
>Subject: [PATCH 6/7] vfs_shadow_copy2: add
> shadow_copy2_strip_snapshot_converted
>
>Can be used by callers to determine if a path is in fact pointing at a
>file in a snapshot. Will be used in the next commit.
>
>Bug: https://bugzilla.samba.org/show_bug.cgi?id=13688
>
>Signed-off-by: Ralph Boehme <slow@samba.org>
>Reviewed-by: Jeremy Allison <jra@samba.org>
>(cherry picked from commit 14d6488d355e960ab02e72c414cbbc316f1db718)
>---
> source3/modules/vfs_shadow_copy2.c | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
>diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
>index c7fc5ee4550..30a202cc9cc 100644
>--- a/source3/modules/vfs_shadow_copy2.c
>+++ b/source3/modules/vfs_shadow_copy2.c
>@@ -771,6 +771,22 @@ static bool shadow_copy2_strip_snapshot(TALLOC_CTX *mem_ctx,
> 					NULL);
> }
> 
>+static bool shadow_copy2_strip_snapshot_converted(TALLOC_CTX *mem_ctx,
>+					struct vfs_handle_struct *handle,
>+					const char *orig_name,
>+					time_t *ptimestamp,
>+					char **pstripped,
>+					bool *is_converted)
>+{
>+	return shadow_copy2_strip_snapshot_internal(mem_ctx,
>+					handle,
>+					orig_name,
>+					ptimestamp,
>+					pstripped,
>+					NULL,
>+					is_converted);
>+}
>+
> static char *shadow_copy2_find_mount_point(TALLOC_CTX *mem_ctx,
> 					   vfs_handle_struct *handle)
> {
>-- 
>2.17.2
>
>
>From c77ad18bdc1dd0a451029bf43abe85df4e4486d2 Mon Sep 17 00:00:00 2001
>From: Ralph Boehme <slow@samba.org>
>Date: Fri, 23 Nov 2018 14:08:15 +0100
>Subject: [PATCH 7/7] vfs_shadow_copy2: nicely deal with attempts to open
> previous version for writing
>
>Bug: https://bugzilla.samba.org/show_bug.cgi?id=13688
>
>Signed-off-by: Ralph Boehme <slow@samba.org>
>Reviewed-by: Jeremy Allison <jra@samba.org>
>(cherry picked from commit cf95756235f718478e556ce1fbf7c032f9c9acfb)
>---
> selftest/knownfail.d/samba3.blackbox |   1 -
> source3/modules/vfs_shadow_copy2.c   | 124 ++++++++++++++++++++++++++-
> 2 files changed, 122 insertions(+), 3 deletions(-)
> delete mode 100644 selftest/knownfail.d/samba3.blackbox
>
>diff --git a/selftest/knownfail.d/samba3.blackbox b/selftest/knownfail.d/samba3.blackbox
>deleted file mode 100644
>index 16537e58aeb..00000000000
>--- a/selftest/knownfail.d/samba3.blackbox
>+++ /dev/null
>@@ -1 +0,0 @@
>-^samba3.blackbox.shadow_copy_torture.writing to shadow copy of a file$fileserver$
>diff --git a/source3/modules/vfs_shadow_copy2.c b/source3/modules/vfs_shadow_copy2.c
>index 30a202cc9cc..746fbd470a9 100644
>--- a/source3/modules/vfs_shadow_copy2.c
>+++ b/source3/modules/vfs_shadow_copy2.c
>@@ -36,6 +36,8 @@
> #include "include/ntioctl.h"
> #include "util_tdb.h"
> #include "lib/util_path.h"
>+#include "libcli/security/security.h"
>+#include "lib/util/tevent_unix.h"
> 
> struct shadow_copy2_config {
> 	char *gmt_format;
>@@ -1376,15 +1378,27 @@ static int shadow_copy2_open(vfs_handle_struct *handle,
> 	time_t timestamp = 0;
> 	char *stripped = NULL;
> 	char *tmp;
>+	bool is_converted = false;
> 	int saved_errno = 0;
> 	int ret;
> 
>-	if (!shadow_copy2_strip_snapshot(talloc_tos(), handle,
>+	if (!shadow_copy2_strip_snapshot_converted(talloc_tos(), handle,
> 					 smb_fname->base_name,
>-					 &timestamp, &stripped)) {
>+					 &timestamp, &stripped,
>+					 &is_converted)) {
> 		return -1;
> 	}
> 	if (timestamp == 0) {
>+		if (is_converted) {
>+			/*
>+			 * Just pave over the user requested mode and use
>+			 * O_RDONLY. Later attempts by the client to write on
>+			 * the handle will fail in the pwrite() syscall with
>+			 * EINVAL which we carefully map to EROFS. In sum, this
>+			 * matches Windows behaviour.
>+			 */
>+			flags = O_RDONLY;
>+		}
> 		return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
> 	}
> 
>@@ -1398,6 +1412,14 @@ static int shadow_copy2_open(vfs_handle_struct *handle,
> 		return -1;
> 	}
> 
>+	/*
>+	 * Just pave over the user requested mode and use O_RDONLY. Later
>+	 * attempts by the client to write on the handle will fail in the
>+	 * pwrite() syscall with EINVAL which we carefully map to EROFS. In sum,
>+	 * this matches Windows behaviour.
>+	 */
>+	flags = O_RDONLY;
>+
> 	ret = SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
> 	if (ret == -1) {
> 		saved_errno = errno;
>@@ -2887,6 +2909,101 @@ static int shadow_copy2_get_quota(vfs_handle_struct *handle,
> 	return ret;
> }
> 
>+static ssize_t shadow_copy2_pwrite(vfs_handle_struct *handle,
>+				   files_struct *fsp,
>+				   const void *data,
>+				   size_t n,
>+				   off_t offset)
>+{
>+	ssize_t nwritten;
>+
>+	nwritten = SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
>+	if (nwritten == -1) {
>+		if (errno == EBADF && fsp->can_write) {
>+			errno = EROFS;
>+		}
>+	}
>+
>+	return nwritten;
>+}
>+
>+struct shadow_copy2_pwrite_state {
>+	vfs_handle_struct *handle;
>+	files_struct *fsp;
>+	ssize_t ret;
>+	struct vfs_aio_state vfs_aio_state;
>+};
>+
>+static void shadow_copy2_pwrite_done(struct tevent_req *subreq);
>+
>+static struct tevent_req *shadow_copy2_pwrite_send(
>+	struct vfs_handle_struct *handle, TALLOC_CTX *mem_ctx,
>+	struct tevent_context *ev, struct files_struct *fsp,
>+	const void *data, size_t n, off_t offset)
>+{
>+	struct tevent_req *req = NULL, *subreq = NULL;
>+	struct shadow_copy2_pwrite_state *state = NULL;
>+
>+	req = tevent_req_create(mem_ctx, &state,
>+				struct shadow_copy2_pwrite_state);
>+	if (req == NULL) {
>+		return NULL;
>+	}
>+	state->handle = handle;
>+	state->fsp = fsp;
>+
>+	subreq = SMB_VFS_NEXT_PWRITE_SEND(state,
>+					  ev,
>+					  handle,
>+					  fsp,
>+					  data,
>+					  n,
>+					  offset);
>+	if (tevent_req_nomem(subreq, req)) {
>+		return tevent_req_post(req, ev);
>+	}
>+	tevent_req_set_callback(subreq, shadow_copy2_pwrite_done, req);
>+
>+	return req;
>+}
>+
>+static void shadow_copy2_pwrite_done(struct tevent_req *subreq)
>+{
>+	struct tevent_req *req = tevent_req_callback_data(
>+		subreq, struct tevent_req);
>+	struct shadow_copy2_pwrite_state *state = tevent_req_data(
>+		req, struct shadow_copy2_pwrite_state);
>+
>+	state->ret = SMB_VFS_PWRITE_RECV(subreq, &state->vfs_aio_state);
>+	TALLOC_FREE(subreq);
>+	if (state->ret == -1) {
>+		tevent_req_error(req, state->vfs_aio_state.error);
>+		return;
>+	}
>+
>+	tevent_req_done(req);
>+}
>+
>+static ssize_t shadow_copy2_pwrite_recv(struct tevent_req *req,
>+					  struct vfs_aio_state *vfs_aio_state)
>+{
>+	struct shadow_copy2_pwrite_state *state = tevent_req_data(
>+		req, struct shadow_copy2_pwrite_state);
>+
>+	if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
>+		if ((vfs_aio_state->error == EBADF) &&
>+		    state->fsp->can_write)
>+		{
>+			vfs_aio_state->error = EROFS;
>+			errno = EROFS;
>+		}
>+		return -1;
>+	}
>+
>+	*vfs_aio_state = state->vfs_aio_state;
>+	return state->ret;
>+}
>+
> static int shadow_copy2_connect(struct vfs_handle_struct *handle,
> 				const char *service, const char *user)
> {
>@@ -3249,6 +3366,9 @@ static struct vfs_fn_pointers vfs_shadow_copy2_fns = {
> 	.setxattr_fn = shadow_copy2_setxattr,
> 	.chflags_fn = shadow_copy2_chflags,
> 	.get_real_filename_fn = shadow_copy2_get_real_filename,
>+	.pwrite_fn = shadow_copy2_pwrite,
>+	.pwrite_send_fn = shadow_copy2_pwrite_send,
>+	.pwrite_recv_fn = shadow_copy2_pwrite_recv,
> 	.connectpath_fn = shadow_copy2_connectpath,
> };
> 
>-- 
>2.17.2
>

Flags:

jra: review+

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Attachments on bug 13688: 14671 | 14713 | 14722 | 18222 | 18223