Currently, the block driver whitelists are only applied for the system
emulator. All other binaries still give unrestricted access to all block
drivers. There are use cases where this made sense because the main
concern was avoiding customers running VMs on less optimised block
drivers and getting bad performance. Allowing the same image format e.g.
as a target for 'qemu-img convert' is not a problem then.
However, if the concern is the supportability of the driver in general,
either in full or when used read-write, not applying the list driver
whitelist in tools doesn't help - especially since qemu-nbd and
qemu-storage-daemon now give access to more or less the same operations
in block drivers as running a system emulator.
In order to address this, introduce a new configure option that enforces
the driver whitelist in all binaries.
Signed-off-by: Kevin Wolf <kw...@redhat.com>
---
configure | 14 ++++++++++++--
block.c | 3 +++
meson.build | 1 +
3 files changed, 16 insertions(+), 2 deletions(-)
diff --git a/configure b/configure
index 650d9c0735..d3f2a362d5 100755
--- a/configure
+++ b/configure
@@ -243,6 +243,7 @@ cross_prefix=""
audio_drv_list=""
block_drv_rw_whitelist=""
block_drv_ro_whitelist=""
+block_drv_whitelist_tools="no"
host_cc="cc"
audio_win_int=""
libs_qga=""
@@ -1003,6 +1004,10 @@ for opt do
;;
--block-drv-ro-whitelist=*) block_drv_ro_whitelist=$(echo "$optarg" | sed -e
's/,/ /g')
;;
+ --enable-block-drv-whitelist-in-tools) block_drv_whitelist_tools="yes"
+ ;;
+ --disable-block-drv-whitelist-in-tools) block_drv_whitelist_tools="no"
+ ;;
--enable-debug-tcg) debug_tcg="yes"
;;
--disable-debug-tcg) debug_tcg="no"
@@ -1776,10 +1781,12 @@ Advanced options (experts only):
--block-drv-whitelist=L Same as --block-drv-rw-whitelist=L
--block-drv-rw-whitelist=L
set block driver read-write whitelist
- (affects only QEMU, not qemu-img)
+ (by default affects only QEMU, not tools like
qemu-img)
--block-drv-ro-whitelist=L
set block driver read-only whitelist
- (affects only QEMU, not qemu-img)
+ (by default affects only QEMU, not tools like
qemu-img)
+ --enable-block-drv-whitelist-in-tools
+ use block whitelist also in tools instead of only
QEMU
--enable-trace-backends=B Set trace backend
Available backends: $trace_backend_list
--with-trace-file=NAME Full PATH,NAME of file to store traces
@@ -4556,6 +4563,9 @@ if test "$audio_win_int" = "yes" ; then
fi
echo "CONFIG_BDRV_RW_WHITELIST=$block_drv_rw_whitelist" >> $config_host_mak
echo "CONFIG_BDRV_RO_WHITELIST=$block_drv_ro_whitelist" >> $config_host_mak
+if test "$block_drv_whitelist_tools" = "yes" ; then
+ echo "CONFIG_BDRV_WHITELIST_TOOLS=y" >> $config_host_mak
+fi
if test "$xfs" = "yes" ; then
echo "CONFIG_XFS=y" >> $config_host_mak
fi
diff --git a/block.c b/block.c
index be083f389e..e97ce0b1c8 100644
--- a/block.c
+++ b/block.c
@@ -6162,6 +6162,9 @@ BlockDriverState
*bdrv_find_backing_image(BlockDriverState *bs,
void bdrv_init(void)
{
+#ifdef CONFIG_BDRV_WHITELIST_TOOLS
+ use_bdrv_whitelist = 1;
+#endif
module_call_init(MODULE_INIT_BLOCK);
}
diff --git a/meson.build b/meson.build
index eb362ee5eb..9b41b9e6d5 100644
--- a/meson.build
+++ b/meson.build
@@ -2859,6 +2859,7 @@ summary_info += {'coroutine pool':
config_host['CONFIG_COROUTINE_POOL'] == '1
if have_block
summary_info += {'Block whitelist (rw)':
config_host['CONFIG_BDRV_RW_WHITELIST']}
summary_info += {'Block whitelist (ro)':
config_host['CONFIG_BDRV_RO_WHITELIST']}
+ summary_info += {'Use block whitelist in tools':
config_host.has_key('CONFIG_BDRV_WHITELIST_TOOLS')}
summary_info += {'VirtFS support': have_virtfs}
summary_info += {'build virtiofs daemon': have_virtiofsd}
summary_info += {'Live block migration':
config_host.has_key('CONFIG_LIVE_BLOCK_MIGRATION')}
--
2.31.1
