linux-kernel - [PATCH v2] fs/proc/task_mmu: add VM_SHADOW

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Message-ID: <20250607131525.76746-1-wangfushuai@baidu.com>
Date: Sat, 7 Jun 2025 21:15:25 +0800
From: wangfushuai <wangfushuai@...du.com>
To: <akpm@...ux-foundation.org>, <david@...hat.com>, <andrii@...nel.org>,
	<osalvador@...e.de>, <Liam.Howlett@...cle.com>, <christophe.leroy@...roup.eu>
CC: <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>,
	wangfushuai <wangfushuai@...du.com>
Subject: [PATCH v2] 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 | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 27972c0749e7..2c2ee893a797 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -994,6 +994,9 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
 #ifdef CONFIG_ARCH_HAS_USER_SHADOW_STACK
 		[ilog2(VM_SHADOW_STACK)] = "ss",
 #endif
+#if defined(CONFIG_ARM64_GCS)
+		[ilog2(VM_SHADOW_STACK)] = "ss",
+#endif
 #if defined(CONFIG_64BIT) || defined(CONFIG_PPC32)
 		[ilog2(VM_DROPPABLE)] = "dp",
 #endif
-- 
2.36.1