linux-kernel - Re: [PATCH 4/5] selinux: use vma_is_stack() and vma_is

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Message-ID: <CAHC9VhSU=T5FEP=sZyNukykE-xRzWsqyddS2-+sEsy2bmfGHKQ@mail.gmail.com>
Date:   Mon, 17 Jul 2023 12:12:58 -0400
From:   Paul Moore <paul@...l-moore.com>
To:     Kefeng Wang <wangkefeng.wang@...wei.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-perf-users@...r.kernel.org,
        selinux@...r.kernel.org
Subject: Re: [PATCH 4/5] selinux: use vma_is_stack() and vma_is_heap()

On Wed, Jul 12, 2023 at 10:25 AM Kefeng Wang <wangkefeng.wang@...wei.com> wrote:
>
> Use the helpers to simplify code.
>
> Signed-off-by: Kefeng Wang <wangkefeng.wang@...wei.com>
> ---
>  security/selinux/hooks.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
>
> diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
> index 4e46cf3d67b6..289ef2d6a427 100644
> --- a/security/selinux/hooks.c
> +++ b/security/selinux/hooks.c
> @@ -3775,13 +3775,10 @@ static int selinux_file_mprotect(struct vm_area_struct *vma,
>         if (default_noexec &&
>             (prot & PROT_EXEC) && !(vma->vm_flags & VM_EXEC)) {
>                 int rc = 0;
> -               if (vma->vm_start >= vma->vm_mm->start_brk &&
> -                   vma->vm_end <= vma->vm_mm->brk) {
> +               if (vma_is_heap(vma)) {
>                         rc = avc_has_perm(sid, sid, SECCLASS_PROCESS,
>                                           PROCESS__EXECHEAP, NULL);
> -               } else if (!vma->vm_file &&
> -                          ((vma->vm_start <= vma->vm_mm->start_stack &&
> -                            vma->vm_end >= vma->vm_mm->start_stack) ||
> +               } else if (!vma->vm_file && vma_is_stack(vma) ||
>                             vma_is_stack_for_current(vma))) {

With the parens fix that Andrew already provided.

Acked-by: Paul Moore <paul@...l-moore.com>

>                         rc = avc_has_perm(sid, sid, SECCLASS_PROCESS,
>                                           PROCESS__EXECSTACK, NULL);
> --
> 2.41.0

-- 
paul-moore.com