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authorDaniel Colascione <dancol@google.com>2021-01-08 14:22:21 -0800
committerPaul Moore <paul@paul-moore.com>2021-01-14 17:31:05 -0500
commite7e832ce6fa769f800cd7eaebdb0459ad31e0416 (patch)
tree975011372d5e154fe1fc921e930465c12c53ab72 /fs/libfs.c
parent215b674b84dd052098fe6389e32a5afaff8b4d56 (diff)
fs: add LSM-supporting anon-inode interface
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 <dancol@google.com> [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 <lokeshgidra@google.com> Reviewed-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Paul Moore <paul@paul-moore.com>
Diffstat (limited to 'fs/libfs.c')
-rw-r--r--fs/libfs.c5
1 files changed, 0 insertions, 5 deletions
diff --git a/fs/libfs.c b/fs/libfs.c
index d1c3bade9f30..e52818fb276a 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -1214,11 +1214,6 @@ 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 = {