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[PATCH v3 02/15] mm/memfd: Introduce MFD_INACCESSIBLE flag
From: |
Chao Peng |
Subject: |
[PATCH v3 02/15] mm/memfd: Introduce MFD_INACCESSIBLE flag |
Date: |
Tue, 21 Dec 2021 23:11:12 +0800 |
Introduce a new memfd_create() flag indicating the content of the
created memfd is inaccessible from userspace. It does this by force
setting F_SEAL_INACCESSIBLE seal when the file is created. It also set
F_SEAL_SEAL to prevent future sealing, which means, it can not coexist
with MFD_ALLOW_SEALING.
Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com>
---
include/uapi/linux/memfd.h | 1 +
mm/memfd.c | 12 +++++++++++-
2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/include/uapi/linux/memfd.h b/include/uapi/linux/memfd.h
index 7a8a26751c23..48750474b904 100644
--- a/include/uapi/linux/memfd.h
+++ b/include/uapi/linux/memfd.h
@@ -8,6 +8,7 @@
#define MFD_CLOEXEC 0x0001U
#define MFD_ALLOW_SEALING 0x0002U
#define MFD_HUGETLB 0x0004U
+#define MFD_INACCESSIBLE 0x0008U
/*
* Huge page size encoding when MFD_HUGETLB is specified, and a huge page
diff --git a/mm/memfd.c b/mm/memfd.c
index 9f80f162791a..c898a007fb76 100644
--- a/mm/memfd.c
+++ b/mm/memfd.c
@@ -245,7 +245,8 @@ long memfd_fcntl(struct file *file, unsigned int cmd,
unsigned long arg)
#define MFD_NAME_PREFIX_LEN (sizeof(MFD_NAME_PREFIX) - 1)
#define MFD_NAME_MAX_LEN (NAME_MAX - MFD_NAME_PREFIX_LEN)
-#define MFD_ALL_FLAGS (MFD_CLOEXEC | MFD_ALLOW_SEALING | MFD_HUGETLB)
+#define MFD_ALL_FLAGS (MFD_CLOEXEC | MFD_ALLOW_SEALING | MFD_HUGETLB | \
+ MFD_INACCESSIBLE)
SYSCALL_DEFINE2(memfd_create,
const char __user *, uname,
@@ -267,6 +268,10 @@ SYSCALL_DEFINE2(memfd_create,
return -EINVAL;
}
+ /* Disallow sealing when MFD_INACCESSIBLE is set. */
+ if (flags & MFD_INACCESSIBLE && flags & MFD_ALLOW_SEALING)
+ return -EINVAL;
+
/* length includes terminating zero */
len = strnlen_user(uname, MFD_NAME_MAX_LEN + 1);
if (len <= 0)
@@ -315,6 +320,11 @@ SYSCALL_DEFINE2(memfd_create,
*file_seals &= ~F_SEAL_SEAL;
}
+ if (flags & MFD_INACCESSIBLE) {
+ file_seals = memfd_file_seals_ptr(file);
+ *file_seals &= F_SEAL_SEAL | F_SEAL_INACCESSIBLE;
+ }
+
fd_install(fd, file);
kfree(name);
return fd;
--
2.17.1
- [PATCH v3 00/15] KVM: mm: fd-based approach for supporting KVM guest private memory, Chao Peng, 2021/12/21
- [PATCH v3 01/15] mm/shmem: Introduce F_SEAL_INACCESSIBLE, Chao Peng, 2021/12/21
- [PATCH v3 02/15] mm/memfd: Introduce MFD_INACCESSIBLE flag,
Chao Peng <=
- [PATCH v3 03/15] mm/memfd: Introduce MEMFD_OPS, Chao Peng, 2021/12/21
- [PATCH v3 04/15] KVM: Extend the memslot to support fd-based private memory, Chao Peng, 2021/12/21
- [PATCH v3 05/15] KVM: Implement fd-based memory using MEMFD_OPS interfaces, Chao Peng, 2021/12/21
- [PATCH v3 06/15] KVM: Refactor hva based memory invalidation code, Chao Peng, 2021/12/21
- [PATCH v3 07/15] KVM: Special handling for fd-based memory invalidation, Chao Peng, 2021/12/21
- [PATCH v3 08/15] KVM: Split out common memory invalidation code, Chao Peng, 2021/12/21
- [PATCH v3 09/15] KVM: Implement fd-based memory invalidation, Chao Peng, 2021/12/21
- [PATCH v3 12/15] KVM: Add KVM_EXIT_MEMORY_ERROR exit, Chao Peng, 2021/12/21
- [PATCH v3 13/15] KVM: Handle page fault for private memory, Chao Peng, 2021/12/21
- [PATCH v3 14/15] KVM: Use kvm_userspace_memory_region_ext, Chao Peng, 2021/12/21