WSL2-Linux-Kernel/fs/crypto
Waiman Long 453431a549 mm, treewide: rename kzfree() to kfree_sensitive()
As said by Linus:

  A symmetric naming is only helpful if it implies symmetries in use.
  Otherwise it's actively misleading.

  In "kzalloc()", the z is meaningful and an important part of what the
  caller wants.

  In "kzfree()", the z is actively detrimental, because maybe in the
  future we really _might_ want to use that "memfill(0xdeadbeef)" or
  something. The "zero" part of the interface isn't even _relevant_.

The main reason that kzfree() exists is to clear sensitive information
that should not be leaked to other future users of the same memory
objects.

Rename kzfree() to kfree_sensitive() to follow the example of the recently
added kvfree_sensitive() and make the intention of the API more explicit.
In addition, memzero_explicit() is used to clear the memory to make sure
that it won't get optimized away by the compiler.

The renaming is done by using the command sequence:

  git grep -w --name-only kzfree |\
  xargs sed -i 's/kzfree/kfree_sensitive/'

followed by some editing of the kfree_sensitive() kerneldoc and adding
a kzfree backward compatibility macro in slab.h.

[akpm@linux-foundation.org: fs/crypto/inline_crypt.c needs linux/slab.h]
[akpm@linux-foundation.org: fix fs/crypto/inline_crypt.c some more]

Suggested-by: Joe Perches <joe@perches.com>
Signed-off-by: Waiman Long <longman@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: David Howells <dhowells@redhat.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Cc: James Morris <jmorris@namei.org>
Cc: "Serge E. Hallyn" <serge@hallyn.com>
Cc: Joe Perches <joe@perches.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: "Jason A . Donenfeld" <Jason@zx2c4.com>
Link: http://lkml.kernel.org/r/20200616154311.12314-3-longman@redhat.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-08-07 11:33:22 -07:00
..
Kconfig fscrypt: switch fscrypt_do_sha256() to use the SHA-256 library 2020-07-21 16:02:13 -07:00
Makefile fscrypt: add inline encryption support 2020-07-08 10:29:30 -07:00
bio.c fscrypt: add inline encryption support 2020-07-08 10:29:30 -07:00
crypto.c fscrypt: rename FS_KEY_DERIVATION_NONCE_SIZE 2020-07-20 17:26:33 -07:00
fname.c fscrypt: switch fscrypt_do_sha256() to use the SHA-256 library 2020-07-21 16:02:13 -07:00
fscrypt_private.h fscrypt: use smp_load_acquire() for fscrypt_prepared_key 2020-07-21 16:02:13 -07:00
hkdf.c fscrypt: use crypto_shash_tfm_digest() 2020-05-08 15:32:14 +10:00
hooks.c fscrypt: fix all kerneldoc warnings 2020-05-12 16:37:17 -07:00
inline_crypt.c mm, treewide: rename kzfree() to kfree_sensitive() 2020-08-07 11:33:22 -07:00
keyring.c mm, treewide: rename kzfree() to kfree_sensitive() 2020-08-07 11:33:22 -07:00
keysetup.c fscrypt: use smp_load_acquire() for ->i_crypt_info 2020-07-21 16:02:13 -07:00
keysetup_v1.c mm, treewide: rename kzfree() to kfree_sensitive() 2020-08-07 11:33:22 -07:00
policy.c fscrypt: use smp_load_acquire() for ->i_crypt_info 2020-07-21 16:02:13 -07:00