جزئیات آسیب‌پذیری

In the Linux kernel, the following vulnerability has been resolved: cifs: use cifs_invalidate_cache() in cifs_do_truncate() for O_TRUNC cifs_do_truncate() is invoked from cifs_open() without i_rwsem, so it cannot use cifs_resize_file_locked() to perform a proper fscache cookie resize. Instead, add cifs_invalidate_cache() after cifs_setsize(). cifs_invalidate_cache() calls fscache_invalidate(), which works without holding i_rwsem: it unconditionally increments inval_counter and sets FSCACHE_COOKIE_NO_DATA_TO_READ, ensuring that stale cached data is not served once the cookie is later activated by fscache_use_cookie(). Truncation to zero leaves no valid cached data, making invalidation the correct semantic here.

• https://git.kernel.org/stable/c/8b9b10fe5b8b492b27b9f4546742ea541a650213
• https://git.kernel.org/stable/c/81fc3868a7f726980ff845c1d0d271051e5f0f45
• https://git.kernel.org/stable/c/364b183230586a62660a7280c1eb20138338eeb5