On Fri, Nov 10, 2023 at 11:19:28PM +0800, Zizhi Wo wrote: > From: WoZ1zh1 <wozizhi@xxxxxxxxxx> > > In mem_lseek, file->f_pos may overflow. And it's not a problem that > mem_open set file mode with FMODE_UNSIGNED_OFFSET(memory_lseek). However, > another file use mem_lseek do lseek can have not FMODE_UNSIGNED_OFFSET > (kpageflags_proc_ops/proc_pagemap_operations...), so in order to prevent > file->f_pos updated to an abnormal number, fix it by checking overflow and > FMODE_UNSIGNED_OFFSET. 1) How is that different from the previous version? 2) Would FMODE_UNSIGNED_OFFSET be wrong for those files? If not, why not?
