linux-kernel - Re: [PATCH] fs/proc/task_mmu: add VM_SHADOW

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Message-ID: <20250607130838.76035-1-wangfushuai@baidu.com>
Date: Sat, 7 Jun 2025 21:08:38 +0800
From: wangfushuai <wangfushuai@...du.com>
To: <wangfushuai@...du.com>
CC: <Liam.Howlett@...cle.com>, <akpm@...ux-foundation.org>,
	<andrii@...nel.org>, <christophe.leroy@...roup.eu>, <david@...hat.com>,
	<linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<osalvador@...e.de>
Subject: Re: [PATCH] fs/proc/task_mmu: add VM_SHADOW_STACK for arm64 when support GCS

> The recent commit adding VM_SHADOW_STACK for arm64 GCS did not update
> the /proc/[pid]/smaps display logic to show the "ss" flag for GCS pages.
> This patch adds the necessary condition to display "ss" flag.
>  
> Fixes: ae80e1629aea ("mm: Define VM_SHADOW_STACK for arm64 when we support GCS")
> Signed-off-by: wangfushuai <wangfushuai@...du.com>
> ---
>  fs/proc/task_mmu.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index 27972c0749e7..c4c942cc6e72 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -991,7 +991,7 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
>  #ifdef CONFIG_HAVE_ARCH_USERFAULTFD_MINOR
>  		[ilog2(VM_UFFD_MINOR)]	= "ui",
>  #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */
> -#ifdef CONFIG_ARCH_HAS_USER_SHADOW_STACK
> +#ifdef CONFIG_ARCH_HAS_USER_SHADOW_STACK || defined(CONFIG_ARM64_GCS)
>  		[ilog2(VM_SHADOW_STACK)] = "ss",
>  #endif
>  #if defined(CONFIG_64BIT) || defined(CONFIG_PPC32)
> -- 
Hi Maintainers,

Please disregard this patch. I accidentally uploaded the wrong version of the code.
I will send the corrected patch shortly. Apologies for the confusion.

Thanks,