bcachefs: Annotate struct bch_xattr with __counted_by()

Add the __counted_by compiler attribute to the flexible array member
x_name to improve access bounds-checking via CONFIG_UBSAN_BOUNDS and
CONFIG_FORTIFY_SOURCE.

Signed-off-by: Thorsten Blum <thorsten.blum@toblux.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

diff --git a/fs/bcachefs/xattr_format.h b/fs/bcachefs/xattr_format.h
index e9f810539552ef6d47024d6a8c21967417ebf6a4..c7916011ef34d3b51c3925a5f6524e4f28f2638f 100644 (file)
--- a/fs/bcachefs/xattr_format.h
+++ b/fs/bcachefs/xattr_format.h
@@ -13,7 +13,7 @@ struct bch_xattr {
        __u8                    x_type;
        __u8                    x_name_len;
        __le16                  x_val_len;
-       __u8                    x_name[];
+       __u8                    x_name[] __counted_by(x_name_len);
 } __packed __aligned(8);
 
 #endif /* _BCACHEFS_XATTR_FORMAT_H */