Re: [PATCH 6/6] exec: use force_uaccess_begin during exec and exit

From: Christoph Hellwig
Date: Wed Jul 15 2020 - 02:06:25 EST


On Tue, Jul 14, 2020 at 10:33:05PM -0500, Eric W. Biederman wrote:
> Christoph Hellwig <hch@xxxxxx> writes:
>
> > Both exec and exit want to ensure that the uaccess routines actually do
> > access user pointers. Use the newly added force_uaccess_begin helper
> > instead of an open coded set_fs for that to prepare for kernel builds
> > where set_fs() does not exist.
>
> Acked-by: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>
>
> Have you played with a tree with all of your patches
> and placing force_uaccess_begin in init/main.c:start_kernel?

No, I have converted the early boot code to not require KERNEL_DS
and except for a pending network item remove set_fs entirely. Older
series here, will need some rework:

http://git.infradead.org/users/hch/misc.git/shortlog/refs/heads/set_fs-removal