Re: mprotect outbound check.
From: Jeff Xu
Date: Mon May 15 2023 - 21:41:52 EST
+ Peter, Lian, Lorenzo
Is this related to this hotfix ?
mm/mprotect: fix do_mprotect_pkey() return on error
On Mon, May 15, 2023 at 11:00 AM Jeff Xu <jeffxu@xxxxxxxxxxxx> wrote:
> Noticed there is a slight change for mprotect between 6.1 and 6.4 RC1
> For example:
> Consider the case below:
> 1 mmap(0x5000000, PAGE_SIZE, ...)
> 2 mprotect(0x5000000, PAGE_SIZE*4, ...)
> in 6.1 and before, 2 will fail, and in 6.4 RC1, it will pass.
> I know that munmap will accept out-of-bound cases like this (because
> memory is freed anyway).
> Is this change intentional ?
> Best regards,