Commit fd74e8d2 authored by Eric Biggers's avatar Eric Biggers Committed by Greg Kroah-Hartman

fscrypt: fix renaming and linking special files

commit 42d97eb0 upstream.

Attempting to link a device node, named pipe, or socket file into an
encrypted directory through rename(2) or link(2) always failed with
EPERM.  This happened because fscrypt_has_permitted_context() saw that
the file was unencrypted and forbid creating the link.  This behavior
was unexpected because such files are never encrypted; only regular
files, directories, and symlinks can be encrypted.

To fix this, make fscrypt_has_permitted_context() always return true on
special files.

This will be covered by a test in my encryption xfstests patchset.

Fixes: 9bd8212f ("ext4 crypto: add encryption policy and password salt support")
Signed-off-by: default avatarEric Biggers <ebiggers@google.com>
Reviewed-by: default avatarRichard Weinberger <richard@nod.at>
Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c10ffe98
...@@ -156,6 +156,12 @@ int ext4_is_child_context_consistent_with_parent(struct inode *parent, ...@@ -156,6 +156,12 @@ int ext4_is_child_context_consistent_with_parent(struct inode *parent,
WARN_ON(1); /* Should never happen */ WARN_ON(1); /* Should never happen */
return 0; return 0;
} }
/* No restrictions on file types which are never encrypted */
if (!S_ISREG(child->i_mode) && !S_ISDIR(child->i_mode) &&
!S_ISLNK(child->i_mode))
return 1;
/* no restrictions if the parent directory is not encrypted */ /* no restrictions if the parent directory is not encrypted */
if (!ext4_encrypted_inode(parent)) if (!ext4_encrypted_inode(parent))
return 1; return 1;
......
...@@ -149,6 +149,11 @@ int f2fs_is_child_context_consistent_with_parent(struct inode *parent, ...@@ -149,6 +149,11 @@ int f2fs_is_child_context_consistent_with_parent(struct inode *parent,
BUG_ON(1); BUG_ON(1);
} }
/* No restrictions on file types which are never encrypted */
if (!S_ISREG(child->i_mode) && !S_ISDIR(child->i_mode) &&
!S_ISLNK(child->i_mode))
return 1;
/* no restrictions if the parent directory is not encrypted */ /* no restrictions if the parent directory is not encrypted */
if (!f2fs_encrypted_inode(parent)) if (!f2fs_encrypted_inode(parent))
return 1; return 1;
......
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