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qemu-kvm/SOURCES/kvm-block-introduce-bdrv_open_file_child-helper.patch

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Import from CS git
2024-07-10 08:10:04 +00:00
From 996680dd6d5afd51918e600126dbfed4dfe89e05 Mon Sep 17 00:00:00 2001
From: Jon Maloy <jmaloy@redhat.com>
Date: Sun, 9 Jun 2024 23:08:39 -0400
Subject: [PATCH 4/5] block: introduce bdrv_open_file_child() helper
RH-Author: Jon Maloy <jmaloy@redhat.com>
RH-MergeRequest: 5: EMBARGOED CVE-2024-4467 for rhel-8.10.z (PRDSC)
RH-Jira: RHEL-35616
RH-CVE: CVE-2024-4467
RH-Acked-by: Kevin Wolf <kwolf@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Commit: [4/5] 9f582a9aff740eb9ec6f64bfec94854038d8545f
Conflicts: - copy-before-write.c::cbw_copy() is an older version than
upstream, but introduction of the new function is
straight-forward.
- include/block/block-global-state.h doesn't exist in this
code version. Adding the prototype to
include/block/block.h instead.
- struct BlockDriver has no field 'filtered_child_is_backing'
We remove the corresponding assert() in the new function.
commit 83930780325b144a5908c45b3957b9b6457b3831
Author: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Date: Tue Jul 26 23:11:21 2022 +0300
block: introduce bdrv_open_file_child() helper
Almost all drivers call bdrv_open_child() similarly. Let's create a
helper for this.
The only not updated drivers that call bdrv_open_child() to set
bs->file are raw-format and snapshot-access:
raw-format sometimes want to have filtered child but
don't set drv->is_filter to true.
snapshot-access wants only DATA | PRIMARY
Possibly we should implement drv->is_filter_func() handler, to consider
raw-format as filter when it works as filter.. But it's another story.
Note also, that we decrease assignments to bs->file in code: it helps
us restrict modifying this field in further commit.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Hanna Reitz <hreitz@redhat.com>
Message-Id: <20220726201134.924743-3-vsementsov@yandex-team.ru>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Jon Maloy <jmaloy@redhat.com>
---
block.c | 18 ++++++++++++++++++
block/blkdebug.c | 9 +++------
block/blklogwrites.c | 7 ++-----
block/blkreplay.c | 7 ++-----
block/blkverify.c | 9 +++------
block/bochs.c | 7 +++----
block/cloop.c | 7 +++----
block/copy-before-write.c | 9 ++++-----
block/copy-on-read.c | 9 ++++-----
block/crypto.c | 11 ++++++-----
block/dmg.c | 7 +++----
block/filter-compress.c | 8 +++-----
block/parallels.c | 7 +++----
block/preallocate.c | 9 ++++-----
block/qcow.c | 6 ++----
block/qcow2.c | 8 ++++----
block/qed.c | 8 ++++----
block/replication.c | 8 +++-----
block/throttle.c | 8 +++-----
block/vdi.c | 7 +++----
block/vhdx.c | 7 +++----
block/vmdk.c | 7 +++----
block/vpc.c | 7 +++----
include/block/block.h | 3 +++
24 files changed, 92 insertions(+), 101 deletions(-)
diff --git a/block.c b/block.c
index 0ac5b163d2..889f878565 100644
--- a/block.c
+++ b/block.c
@@ -3546,6 +3546,24 @@ BdrvChild *bdrv_open_child(const char *filename,
errp);
}
+/*
+ * Wrapper on bdrv_open_child() for most popular case: open primary child of bs.
+ */
+int bdrv_open_file_child(const char *filename,
+ QDict *options, const char *bdref_key,
+ BlockDriverState *parent, Error **errp)
+{
+ BdrvChildRole role;
+
+ role = parent->drv->is_filter ?
+ (BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY) : BDRV_CHILD_IMAGE;
+
+ parent->file = bdrv_open_child(filename, options, bdref_key, parent,
+ &child_of_bds, role, false, errp);
+
+ return parent->file ? 0 : -EINVAL;
+}
+
/*
* TODO Future callers may need to specify parent/child_class in order for
* option inheritance to work. Existing callers use it for the root node.
diff --git a/block/blkdebug.c b/block/blkdebug.c
index bbf2948703..5fcfc8ac6f 100644
--- a/block/blkdebug.c
+++ b/block/blkdebug.c
@@ -503,12 +503,9 @@ static int blkdebug_open(BlockDriverState *bs, QDict *options, int flags,
}
/* Open the image file */
- bs->file = bdrv_open_child(qemu_opt_get(opts, "x-image"), options, "image",
- bs, &child_of_bds,
- BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
- false, errp);
- if (!bs->file) {
- ret = -EINVAL;
+ ret = bdrv_open_file_child(qemu_opt_get(opts, "x-image"), options, "image",
+ bs, errp);
+ if (ret < 0) {
goto out;
}
diff --git a/block/blklogwrites.c b/block/blklogwrites.c
index f7a251e91f..f66a617eb3 100644
--- a/block/blklogwrites.c
+++ b/block/blklogwrites.c
@@ -155,11 +155,8 @@ static int blk_log_writes_open(BlockDriverState *bs, QDict *options, int flags,
}
/* Open the file */
- bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
- BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY, false,
- errp);
- if (!bs->file) {
- ret = -EINVAL;
+ ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
+ if (ret < 0) {
goto fail;
}
diff --git a/block/blkreplay.c b/block/blkreplay.c
index dcbe780ddb..76a0b8d12a 100644
--- a/block/blkreplay.c
+++ b/block/blkreplay.c
@@ -26,11 +26,8 @@ static int blkreplay_open(BlockDriverState *bs, QDict *options, int flags,
int ret;
/* Open the image file */
- bs->file = bdrv_open_child(NULL, options, "image", bs, &child_of_bds,
- BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
- false, errp);
- if (!bs->file) {
- ret = -EINVAL;
+ ret = bdrv_open_file_child(NULL, options, "image", bs, errp);
+ if (ret < 0) {
goto fail;
}
diff --git a/block/blkverify.c b/block/blkverify.c
index d1facf5ba9..920e891684 100644
--- a/block/blkverify.c
+++ b/block/blkverify.c
@@ -121,12 +121,9 @@ static int blkverify_open(BlockDriverState *bs, QDict *options, int flags,
}
/* Open the raw file */
- bs->file = bdrv_open_child(qemu_opt_get(opts, "x-raw"), options, "raw",
- bs, &child_of_bds,
- BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
- false, errp);
- if (!bs->file) {
- ret = -EINVAL;
+ ret = bdrv_open_file_child(qemu_opt_get(opts, "x-raw"), options, "raw",
+ bs, errp);
+ if (ret < 0) {
goto fail;
}
diff --git a/block/bochs.c b/block/bochs.c
index 4d68658087..b2dc06bbfd 100644
--- a/block/bochs.c
+++ b/block/bochs.c
@@ -110,10 +110,9 @@ static int bochs_open(BlockDriverState *bs, QDict *options, int flags,
return ret;
}
- bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
- BDRV_CHILD_IMAGE, false, errp);
- if (!bs->file) {
- return -EINVAL;
+ ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
+ if (ret < 0) {
+ return ret;
}
ret = bdrv_pread(bs->file, 0, &bochs, sizeof(bochs));
diff --git a/block/cloop.c b/block/cloop.c
index b8c6d0eccd..bee87da173 100644
--- a/block/cloop.c
+++ b/block/cloop.c
@@ -71,10 +71,9 @@ static int cloop_open(BlockDriverState *bs, QDict *options, int flags,
return ret;
}
- bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
- BDRV_CHILD_IMAGE, false, errp);
- if (!bs->file) {
- return -EINVAL;
+ ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
+ if (ret < 0) {
+ return ret;
}
/* read header */
diff --git a/block/copy-before-write.c b/block/copy-before-write.c
index c30a5ff8de..8aa2cb6a85 100644
--- a/block/copy-before-write.c
+++ b/block/copy-before-write.c
@@ -150,12 +150,11 @@ static int cbw_open(BlockDriverState *bs, QDict *options, int flags,
{
BDRVCopyBeforeWriteState *s = bs->opaque;
BdrvDirtyBitmap *copy_bitmap;
+ int ret;
- bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
- BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
- false, errp);
- if (!bs->file) {
- return -EINVAL;
+ ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
+ if (ret < 0) {
+ return ret;
}
s->target = bdrv_open_child(NULL, options, "target", bs, &child_of_bds,
diff --git a/block/copy-on-read.c b/block/copy-on-read.c
index 1fc7fb3333..815ac1d835 100644
--- a/block/copy-on-read.c
+++ b/block/copy-on-read.c
@@ -41,12 +41,11 @@ static int cor_open(BlockDriverState *bs, QDict *options, int flags,
BDRVStateCOR *state = bs->opaque;
/* Find a bottom node name, if any */
const char *bottom_node = qdict_get_try_str(options, "bottom");
+ int ret;
- bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
- BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
- false, errp);
- if (!bs->file) {
- return -EINVAL;
+ ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
+ if (ret < 0) {
+ return ret;
}
bs->supported_read_flags = BDRV_REQ_PREFETCH;
diff --git a/block/crypto.c b/block/crypto.c
index c8ba4681e2..abfce39230 100644
--- a/block/crypto.c
+++ b/block/crypto.c
@@ -260,15 +260,14 @@ static int block_crypto_open_generic(QCryptoBlockFormat format,
{
BlockCrypto *crypto = bs->opaque;
QemuOpts *opts = NULL;
- int ret = -EINVAL;
+ int ret;
QCryptoBlockOpenOptions *open_opts = NULL;
unsigned int cflags = 0;
QDict *cryptoopts = NULL;
- bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
- BDRV_CHILD_IMAGE, false, errp);
- if (!bs->file) {
- return -EINVAL;
+ ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
+ if (ret < 0) {
+ return ret;
}
bs->supported_write_flags = BDRV_REQ_FUA &
@@ -276,6 +275,7 @@ static int block_crypto_open_generic(QCryptoBlockFormat format,
opts = qemu_opts_create(opts_spec, NULL, 0, &error_abort);
if (!qemu_opts_absorb_qdict(opts, options, errp)) {
+ ret = -EINVAL;
goto cleanup;
}
@@ -284,6 +284,7 @@ static int block_crypto_open_generic(QCryptoBlockFormat format,
open_opts = block_crypto_open_opts_init(cryptoopts, errp);
if (!open_opts) {
+ ret = -EINVAL;
goto cleanup;
}
diff --git a/block/dmg.c b/block/dmg.c
index 447901fbb8..38c363dd39 100644
--- a/block/dmg.c
+++ b/block/dmg.c
@@ -439,10 +439,9 @@ static int dmg_open(BlockDriverState *bs, QDict *options, int flags,
return ret;
}
- bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
- BDRV_CHILD_IMAGE, false, errp);
- if (!bs->file) {
- return -EINVAL;
+ ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
+ if (ret < 0) {
+ return ret;
}
block_module_load_one("dmg-bz2");
diff --git a/block/filter-compress.c b/block/filter-compress.c
index d5be538619..305716c86c 100644
--- a/block/filter-compress.c
+++ b/block/filter-compress.c
@@ -30,11 +30,9 @@
static int compress_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
- bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
- BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
- false, errp);
- if (!bs->file) {
- return -EINVAL;
+ int ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
+ if (ret < 0) {
+ return ret;
}
if (!bs->file->bs->drv || !block_driver_can_compress(bs->file->bs->drv)) {
diff --git a/block/parallels.c b/block/parallels.c
index 6ebad2a2bb..ed4debd899 100644
--- a/block/parallels.c
+++ b/block/parallels.c
@@ -735,10 +735,9 @@ static int parallels_open(BlockDriverState *bs, QDict *options, int flags,
Error *local_err = NULL;
char *buf;
- bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
- BDRV_CHILD_IMAGE, false, errp);
- if (!bs->file) {
- return -EINVAL;
+ ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
+ if (ret < 0) {
+ return ret;
}
ret = bdrv_pread(bs->file, 0, &ph, sizeof(ph));
diff --git a/block/preallocate.c b/block/preallocate.c
index 1d4233f730..332408bdc9 100644
--- a/block/preallocate.c
+++ b/block/preallocate.c
@@ -134,6 +134,7 @@ static int preallocate_open(BlockDriverState *bs, QDict *options, int flags,
Error **errp)
{
BDRVPreallocateState *s = bs->opaque;
+ int ret;
/*
* s->data_end and friends should be initialized on permission update.
@@ -141,11 +142,9 @@ static int preallocate_open(BlockDriverState *bs, QDict *options, int flags,
*/
s->file_end = s->zero_start = s->data_end = -EINVAL;
- bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
- BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
- false, errp);
- if (!bs->file) {
- return -EINVAL;
+ ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
+ if (ret < 0) {
+ return ret;
}
if (!preallocate_absorb_opts(&s->opts, options, bs->file->bs, errp)) {
diff --git a/block/qcow.c b/block/qcow.c
index c39940f33e..544a17261f 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -120,10 +120,8 @@ static int qcow_open(BlockDriverState *bs, QDict *options, int flags,
qdict_extract_subqdict(options, &encryptopts, "encrypt.");
encryptfmt = qdict_get_try_str(encryptopts, "format");
- bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
- BDRV_CHILD_IMAGE, false, errp);
- if (!bs->file) {
- ret = -EINVAL;
+ ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
+ if (ret < 0) {
goto fail;
}
diff --git a/block/qcow2.c b/block/qcow2.c
index 6ee1919612..29ea157e6b 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1907,11 +1907,11 @@ static int qcow2_open(BlockDriverState *bs, QDict *options, int flags,
.errp = errp,
.ret = -EINPROGRESS
};
+ int ret;
- bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
- BDRV_CHILD_IMAGE, false, errp);
- if (!bs->file) {
- return -EINVAL;
+ ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
+ if (ret < 0) {
+ return ret;
}
/* Initialise locks */
diff --git a/block/qed.c b/block/qed.c
index 558d3646c4..e3b06a3d00 100644
--- a/block/qed.c
+++ b/block/qed.c
@@ -558,11 +558,11 @@ static int bdrv_qed_open(BlockDriverState *bs, QDict *options, int flags,
.errp = errp,
.ret = -EINPROGRESS
};
+ int ret;
- bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
- BDRV_CHILD_IMAGE, false, errp);
- if (!bs->file) {
- return -EINVAL;
+ ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
+ if (ret < 0) {
+ return ret;
}
bdrv_qed_init_state(bs);
diff --git a/block/replication.c b/block/replication.c
index 55c8f894aa..2f17397764 100644
--- a/block/replication.c
+++ b/block/replication.c
@@ -88,11 +88,9 @@ static int replication_open(BlockDriverState *bs, QDict *options,
const char *mode;
const char *top_id;
- bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
- BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
- false, errp);
- if (!bs->file) {
- return -EINVAL;
+ ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
+ if (ret < 0) {
+ return ret;
}
ret = -EINVAL;
diff --git a/block/throttle.c b/block/throttle.c
index 6e8d52fa24..4fb5798c27 100644
--- a/block/throttle.c
+++ b/block/throttle.c
@@ -78,11 +78,9 @@ static int throttle_open(BlockDriverState *bs, QDict *options,
char *group;
int ret;
- bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
- BDRV_CHILD_FILTERED | BDRV_CHILD_PRIMARY,
- false, errp);
- if (!bs->file) {
- return -EINVAL;
+ ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
+ if (ret < 0) {
+ return ret;
}
bs->supported_write_flags = bs->file->bs->supported_write_flags |
BDRV_REQ_WRITE_UNCHANGED;
diff --git a/block/vdi.c b/block/vdi.c
index bdc58d726e..c50c0ed61f 100644
--- a/block/vdi.c
+++ b/block/vdi.c
@@ -376,10 +376,9 @@ static int vdi_open(BlockDriverState *bs, QDict *options, int flags,
int ret;
QemuUUID uuid_link, uuid_parent;
- bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
- BDRV_CHILD_IMAGE, false, errp);
- if (!bs->file) {
- return -EINVAL;
+ ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
+ if (ret < 0) {
+ return ret;
}
logout("\n");
diff --git a/block/vhdx.c b/block/vhdx.c
index 356ec4c455..e7d6d7509a 100644
--- a/block/vhdx.c
+++ b/block/vhdx.c
@@ -996,10 +996,9 @@ static int vhdx_open(BlockDriverState *bs, QDict *options, int flags,
uint64_t signature;
Error *local_err = NULL;
- bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
- BDRV_CHILD_IMAGE, false, errp);
- if (!bs->file) {
- return -EINVAL;
+ ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
+ if (ret < 0) {
+ return ret;
}
s->bat = NULL;
diff --git a/block/vmdk.c b/block/vmdk.c
index 0dfab6e941..7d7e56b36c 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -1262,10 +1262,9 @@ static int vmdk_open(BlockDriverState *bs, QDict *options, int flags,
BDRVVmdkState *s = bs->opaque;
uint32_t magic;
- bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
- BDRV_CHILD_IMAGE, false, errp);
- if (!bs->file) {
- return -EINVAL;
+ ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
+ if (ret < 0) {
+ return ret;
}
buf = vmdk_read_desc(bs->file, 0, errp);
diff --git a/block/vpc.c b/block/vpc.c
index 297a26262a..430cab1cbb 100644
--- a/block/vpc.c
+++ b/block/vpc.c
@@ -232,10 +232,9 @@ static int vpc_open(BlockDriverState *bs, QDict *options, int flags,
int ret;
int64_t bs_size;
- bs->file = bdrv_open_child(NULL, options, "file", bs, &child_of_bds,
- BDRV_CHILD_IMAGE, false, errp);
- if (!bs->file) {
- return -EINVAL;
+ ret = bdrv_open_file_child(NULL, options, "file", bs, errp);
+ if (ret < 0) {
+ return ret;
}
opts = qemu_opts_create(&vpc_runtime_opts, NULL, 0, &error_abort);
diff --git a/include/block/block.h b/include/block/block.h
index e5dd22b034..f885f113ef 100644
--- a/include/block/block.h
+++ b/include/block/block.h
@@ -376,6 +376,9 @@ BdrvChild *bdrv_open_child(const char *filename,
const BdrvChildClass *child_class,
BdrvChildRole child_role,
bool allow_none, Error **errp);
+int bdrv_open_file_child(const char *filename,
+ QDict *options, const char *bdref_key,
+ BlockDriverState *parent, Error **errp);
BlockDriverState *bdrv_open_blockdev_ref(BlockdevRef *ref, Error **errp);
int bdrv_set_backing_hd(BlockDriverState *bs, BlockDriverState *backing_hd,
Error **errp);
--
2.39.3
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