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btrfs-progs: sanity check global roots key.offset 

For !extent tree v2 we should validate the key.offset == 0, and for
extent tree v2 we should validate that key.offset < nr_global_roots.  If
this fails we need to fail to load the global root so that the
appropriate action is taken.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2022-02-08 14:30:05 -05:00 committed by David Sterba
parent 56760e8dca
commit 532bf58b5b
2 changed files with 10 additions and 0 deletions
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1
kernel-shared/ctree.h
View File

@ -1233,6 +1233,7 @@ struct btrfs_fs_info {
u64 super_bytenr;
u64 total_pinned;
u64 nr_global_roots;
struct list_head dirty_cowonly_roots;
struct list_head recow_ebs;

9
kernel-shared/disk-io.c
View File

@ -933,7 +933,9 @@ struct btrfs_fs_info *btrfs_new_fs_info(int writable, u64 sb_bytenr)
fs_info->data_alloc_profile = (u64)-1;
fs_info->metadata_alloc_profile = (u64)-1;
fs_info->system_alloc_profile = fs_info->metadata_alloc_profile;
fs_info->nr_global_roots = 1;
return fs_info;
free_all:
btrfs_free_fs_info(fs_info);
return NULL;
@ -1075,6 +1077,13 @@ static int load_global_roots_objectid(struct btrfs_fs_info *fs_info,
if (key.objectid != objectid)
break;
if (key.offset >= fs_info->nr_global_roots) {
warning("global root with too large of an offset [%llu %llu]",
key.objectid, key.offset);
ret = -EINVAL;
break;
}
root = calloc(1, sizeof(*root));
if (!root) {
ret = -ENOMEM;