Re: [PATCH -next V2] proc: support file->f_pos checking in mem_lseek

[Al Viro]

On Thu, Nov 09, 2023 at 06:26:58PM +0800, WoZ1zh1 wrote:
> 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.

Umm...  Is there any reasons why all of those shouldn't get FMODE_UNSIGNED_OFFSET
as well?