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-rw-r--r--pkg/sentry/fs/proc/uid_gid_map.go5
1 files changed, 4 insertions, 1 deletions
diff --git a/pkg/sentry/fs/proc/uid_gid_map.go b/pkg/sentry/fs/proc/uid_gid_map.go
index a52e0cb1f..0c68bbfc9 100644
--- a/pkg/sentry/fs/proc/uid_gid_map.go
+++ b/pkg/sentry/fs/proc/uid_gid_map.go
@@ -169,5 +169,8 @@ func (imfo *idMapFileOperations) Write(ctx context.Context, file *fs.File, src u
if err != nil {
return 0, err
}
- return int64(len(b)), nil
+
+ // On success, Linux's kernel/user_namespace.c:map_write() always returns
+ // count, even if fewer bytes were used.
+ return int64(srclen), nil
}