From 453431a54934d917153c65211b2dabf45562ca88 Mon Sep 17 00:00:00 2001 From: Waiman Long Date: Thu, 6 Aug 2020 23:18:13 -0700 Subject: 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 Signed-off-by: Waiman Long Signed-off-by: Andrew Morton Acked-by: David Howells Acked-by: Michal Hocko Acked-by: Johannes Weiner Cc: Jarkko Sakkinen Cc: James Morris Cc: "Serge E. Hallyn" Cc: Joe Perches Cc: Matthew Wilcox Cc: David Rientjes Cc: Dan Carpenter Cc: "Jason A . Donenfeld" Link: http://lkml.kernel.org/r/20200616154311.12314-3-longman@redhat.com Signed-off-by: Linus Torvalds --- fs/cifs/misc.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'fs/cifs/misc.c') diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c index e44d049142d0..3e3772446c71 100644 --- a/fs/cifs/misc.c +++ b/fs/cifs/misc.c @@ -103,12 +103,12 @@ sesInfoFree(struct cifs_ses *buf_to_free) kfree(buf_to_free->serverOS); kfree(buf_to_free->serverDomain); kfree(buf_to_free->serverNOS); - kzfree(buf_to_free->password); + kfree_sensitive(buf_to_free->password); kfree(buf_to_free->user_name); kfree(buf_to_free->domainName); - kzfree(buf_to_free->auth_key.response); + kfree_sensitive(buf_to_free->auth_key.response); kfree(buf_to_free->iface_list); - kzfree(buf_to_free); + kfree_sensitive(buf_to_free); } struct cifs_tcon * @@ -148,7 +148,7 @@ tconInfoFree(struct cifs_tcon *buf_to_free) } atomic_dec(&tconInfoAllocCount); kfree(buf_to_free->nativeFileSystem); - kzfree(buf_to_free->password); + kfree_sensitive(buf_to_free->password); kfree(buf_to_free->crfid.fid); #ifdef CONFIG_CIFS_DFS_UPCALL kfree(buf_to_free->dfs_path); -- cgit v1.2.3