[pve-devel] [PATCH qemu-server 1/1] disk import: add additional safeguards for imported image files

[Fabian Grünbichler]

creating non-raw disk images with arbitrary content is only possible with raw
access to the storage, but checking for references to external files doesn't
hurt.

Signed-off-by: Fabian Grünbichler <f.gruenbichler at proxmox.com>
---

Notes:
    requires pve-storage change to actually have an effect

 PVE/API2/Qemu.pm | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/PVE/API2/Qemu.pm b/PVE/API2/Qemu.pm
index d25a79fe..30839745 100644
--- a/PVE/API2/Qemu.pm
+++ b/PVE/API2/Qemu.pm
@@ -412,12 +412,14 @@ my sub create_disks : prototype($$$$$$$$$$) {
 
 		$needs_creation = $live_import;
 
-		if (PVE::Storage::parse_volume_id($source, 1)) { # PVE-managed volume
+		if (my ($source_storage, $source_volid) = PVE::Storage::parse_volume_id($source, 1)) { # PVE-managed volume
 		    if ($live_import && $ds ne 'efidisk0') {
 			my $path = PVE::Storage::path($storecfg, $source)
 			    or die "failed to get a path for '$source'\n";
 			$source = $path;
-			($size, my $source_format) = PVE::Storage::file_size_info($source);
+			# check potentially untrusted image file!
+			($size, my $source_format) = PVE::Storage::file_size_info($source, undef, 1);
+
 			die "could not get file size of $source\n" if !$size;
 			$live_import_mapping->{$ds} = {
 			    path => $source,
@@ -431,6 +433,12 @@ my sub create_disks : prototype($$$$$$$$$$) {
 			    format => $disk->{format},
 			};
 
+			my $scfg = PVE::Storage::storage_config($storecfg, $source_storage);
+			# check potentially untrusted image file!
+			if ($scfg->{path}) {
+			    PVE::Storage::file_size_info(PVE::Storage::path($storecfg, $source), undef, 1);
+			}
+
 			$dest_info->{efisize} = PVE::QemuServer::get_efivars_size($conf, $disk)
 			    if $ds eq 'efidisk0';
 
@@ -441,7 +449,8 @@ my sub create_disks : prototype($$$$$$$$$$) {
 		    }
 		} else {
 		    $source = PVE::Storage::abs_filesystem_path($storecfg, $source, 1);
-		    ($size, my $source_format) = PVE::Storage::file_size_info($source);
+		    # check potentially untrusted image file!
+		    ($size, my $source_format) = PVE::Storage::file_size_info($source, undef, 1);
 		    die "could not get file size of $source\n" if !$size;
 
 		    if ($live_import && $ds ne 'efidisk0') {
-- 
2.39.2