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UPSTREAM: fs: add LSM-supporting anon-inode interface

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This change adds a new function, anon_inode_getfd_secure, that creates
anonymous-node file with individual non-S_PRIVATE inode to which security
modules can apply policy. Existing callers continue using the original
singleton-inode kind of anonymous-inode file. We can transition anonymous
inode users to the new kind of anonymous inode in individual patches for
the sake of bisection and review.

The new function accepts an optional context_inode parameter that callers
can use to provide additional contextual information to security modules.
For example, in case of userfaultfd, the created inode is a 'logical child'
of the context_inode (userfaultfd inode of the parent process) in the sense
that it provides the security context required during creation of the child
process' userfaultfd inode.

Signed-off-by: Daniel Colascione <[email protected]>
[LG: Delete obsolete comments to alloc_anon_inode()]
[LG: Add context_inode description in comments to anon_inode_getfd_secure()]
[LG: Remove definition of anon_inode_getfile_secure() as there are no callers]
[LG: Make __anon_inode_getfile() static]
[LG: Use correct error cast in __anon_inode_getfile()]
[LG: Fix error handling in __anon_inode_getfile()]
Signed-off-by: Lokesh Gidra <[email protected]>
Reviewed-by: Eric Biggers <[email protected]>
Signed-off-by: Paul Moore <[email protected]>
(cherry picked from commit e7e832ce6fa769f800cd7eaebdb0459ad31e0416)
Signed-off-by: Lokesh Gidra <[email protected]>
Bug: 160737021
Bug: 169683130
Change-Id: I88f1821243c58454ce445fd50fd804221e0bfc67
This commit is contained in:
Daniel Colascione 2021-01-08 14:22:21 -08:00 • committed by Michael Bestas
commit 8b618316b7
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3 changed files with 115 additions and 45 deletions
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5
fs/libfs.c
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@ -1160,11 +1160,6 @@ static int anon_set_page_dirty(struct page *page)
return 0;
};
/*
* A single inode exists for all anon_inode files. Contrary to pipes,
* anon_inode inodes have no associated per-instance data, so we need
* only allocate one of them.
*/
struct inode *alloc_anon_inode(struct super_block *s)
{
static const struct address_space_operations anon_aops = {