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From: jeffxu@chromium.org
To: akpm@linux-foundation.org,
	jannh@google.com,
	sroettger@google.com,
	rdunlap@infradead.org,
	david@redhat.com,
	adhemerval.zanella@linaro.org
Cc: linux-kernel@vger.kernel.org,
	linux-mm@kvack.org,
	jorgelo@chromium.org,
	keescook@chromium.org,
	Jeff Xu <jeffxu@chromium.org>
Subject: [PATCH v1 1/1] /proc/pid/smaps: add mseal info for vma
Date: Fri, 14 Jun 2024 18:23:27 +0000
Message-ID: <20240614182327.752156-2-jeffxu@google.com>
In-Reply-To: <20240614182327.752156-1-jeffxu@google.com>
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From: Jeff Xu <jeffxu@chromium.org>

Add sp in /proc/pid/smaps to indicate vma is sealed

Signed-off-by: Jeff Xu <jeffxu@chromium.org>
---
 Documentation/filesystems/proc.rst | 1 +
 fs/proc/task_mmu.c                 | 3 +++
 include/linux/mm.h                 | 5 +++++
 mm/internal.h                      | 5 -----
 4 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
index 7c3a565ffbef..400217a1589c 100644
--- a/Documentation/filesystems/proc.rst
+++ b/Documentation/filesystems/proc.rst
@@ -571,6 +571,7 @@ encoded manner. The codes are the following:
     um    userfaultfd missing tracking
     uw    userfaultfd wr-protect tracking
     ss    shadow stack page
+    sp    sealed page
     ==    =======================================
 
 Note that there is no guarantee that every flag and associated mnemonic will
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 6ed1f56b32b4..ba2db75ca22a 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -711,6 +711,9 @@ static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma)
 #endif /* CONFIG_HAVE_ARCH_USERFAULTFD_MINOR */
 #ifdef CONFIG_X86_USER_SHADOW_STACK
 		[ilog2(VM_SHADOW_STACK)] = "ss",
+#endif
+#ifdef CONFIG_64BIT
+		[ilog2(VM_SEALED)] = "sp",
 #endif
 	};
 	size_t i;
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 587d34879865..8600564898fa 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -314,6 +314,11 @@ extern unsigned int kobjsize(const void *objp);
 #define VM_NOHUGEPAGE	0x40000000	/* MADV_NOHUGEPAGE marked this vma */
 #define VM_MERGEABLE	0x80000000	/* KSM may merge identical pages */
 
+#ifdef CONFIG_64BIT
+/* VM is sealed, in vm_flags */
+#define VM_SEALED	_BITUL(63)
+#endif
+
 #ifdef CONFIG_ARCH_USES_HIGH_VMA_FLAGS
 #define VM_HIGH_ARCH_BIT_0	32	/* bit only usable on 64-bit architectures */
 #define VM_HIGH_ARCH_BIT_1	33	/* bit only usable on 64-bit architectures */
diff --git a/mm/internal.h b/mm/internal.h
index fd68c43664d5..72f7c110d563 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -1509,11 +1509,6 @@ void __meminit __init_single_page(struct page *page, unsigned long pfn,
 unsigned long shrink_slab(gfp_t gfp_mask, int nid, struct mem_cgroup *memcg,
 			  int priority);
 
-#ifdef CONFIG_64BIT
-/* VM is sealed, in vm_flags */
-#define VM_SEALED	_BITUL(63)
-#endif
-
 #ifdef CONFIG_64BIT
 static inline int can_do_mseal(unsigned long flags)
 {
-- 
2.45.2.627.g7a2c4fd464-goog