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authorWaiman Long <longman@redhat.com>2020-08-06 23:18:13 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-08-07 11:33:22 -0700
commit453431a54934d917153c65211b2dabf45562ca88 (patch)
treee9672e7fb28f59331ff00fe6197360d703cbd9c3 /drivers/crypto/nx
parent57c720d4144a9c2b88105c3e8f7b0e97e4b5cc93 (diff)
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>
Diffstat (limited to 'drivers/crypto/nx')
-rw-r--r--drivers/crypto/nx/nx.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/crypto/nx/nx.c b/drivers/crypto/nx/nx.c
index f03c238f5a31..40882d6d52c1 100644
--- a/drivers/crypto/nx/nx.c
+++ b/drivers/crypto/nx/nx.c
@@ -746,7 +746,7 @@ void nx_crypto_ctx_exit(struct crypto_tfm *tfm)
{
struct nx_crypto_ctx *nx_ctx = crypto_tfm_ctx(tfm);
- kzfree(nx_ctx->kmem);
+ kfree_sensitive(nx_ctx->kmem);
nx_ctx->csbcpb = NULL;
nx_ctx->csbcpb_aead = NULL;
nx_ctx->in_sg = NULL;
@@ -762,7 +762,7 @@ void nx_crypto_ctx_aead_exit(struct crypto_aead *tfm)
{
struct nx_crypto_ctx *nx_ctx = crypto_aead_ctx(tfm);
- kzfree(nx_ctx->kmem);
+ kfree_sensitive(nx_ctx->kmem);
}
static int nx_probe(struct vio_dev *viodev, const struct vio_device_id *id)