[PATCH v6 8/8] memfd_create.2: Describe MFD_INACCESSIBLE flag
From: Chao Peng <hidden>
Date: 2022-05-19 15:44:08
Also in:
kvm, linux-doc, linux-fsdevel, linux-mm, lkml, qemu-devel
Subsystem:
the rest · Maintainer:
Linus Torvalds
Signed-off-by: Chao Peng <redacted> --- man2/memfd_create.2 | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/man2/memfd_create.2 b/man2/memfd_create.2
index 89e9c4136..2698222ae 100644
--- a/man2/memfd_create.2
+++ b/man2/memfd_create.2@@ -101,6 +101,19 @@ meaning that no other seals can be set on the file. .\" FIXME Why is the MFD_ALLOW_SEALING behavior not simply the default? .\" Is it worth adding some text explaining this? .TP +.BR MFD_INACCESSIBLE +Disallow userspace access through ordinary MMU accesses via +.BR read (2), +.BR write (2) +and +.BR mmap (2). +The file size cannot be changed once initialized. +This flag cannot coexist with +.B MFD_ALLOW_SEALING +and when this flag is set, the initial set of seals will be +.B F_SEAL_SEAL, +meaning that no other seals can be set on the file. +.TP .BR MFD_HUGETLB " (since Linux 4.14)" .\" commit 749df87bd7bee5a79cef073f5d032ddb2b211de8 The anonymous file will be created in the hugetlbfs filesystem using
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2.17.1