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 --- drivers/crypto/ccree/cc_buffer_mgr.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'drivers/crypto/ccree/cc_buffer_mgr.c') diff --git a/drivers/crypto/ccree/cc_buffer_mgr.c b/drivers/crypto/ccree/cc_buffer_mgr.c index b2bd093e7013..a5e041d9d2cf 100644 --- a/drivers/crypto/ccree/cc_buffer_mgr.c +++ b/drivers/crypto/ccree/cc_buffer_mgr.c @@ -488,7 +488,7 @@ void cc_unmap_aead_request(struct device *dev, struct aead_request *req) if (areq_ctx->gen_ctx.iv_dma_addr) { dma_unmap_single(dev, areq_ctx->gen_ctx.iv_dma_addr, hw_iv_size, DMA_BIDIRECTIONAL); - kzfree(areq_ctx->gen_ctx.iv); + kfree_sensitive(areq_ctx->gen_ctx.iv); } /* Release pool */ @@ -559,7 +559,7 @@ static int cc_aead_chain_iv(struct cc_drvdata *drvdata, if (dma_mapping_error(dev, areq_ctx->gen_ctx.iv_dma_addr)) { dev_err(dev, "Mapping iv %u B at va=%pK for DMA failed\n", hw_iv_size, req->iv); - kzfree(areq_ctx->gen_ctx.iv); + kfree_sensitive(areq_ctx->gen_ctx.iv); areq_ctx->gen_ctx.iv = NULL; rc = -ENOMEM; goto chain_iv_exit; -- cgit v1.2.3