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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/misc
parent57c720d4144a9c2b88105c3e8f7b0e97e4b5cc93 (diff)
downloadlwn-453431a54934d917153c65211b2dabf45562ca88.tar.gz
lwn-453431a54934d917153c65211b2dabf45562ca88.zip
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/misc')
-rw-r--r--drivers/misc/ibmvmc.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/misc/ibmvmc.c b/drivers/misc/ibmvmc.c
index c0d139c26505..2d778d0f011e 100644
--- a/drivers/misc/ibmvmc.c
+++ b/drivers/misc/ibmvmc.c
@@ -286,7 +286,7 @@ static void *alloc_dma_buffer(struct vio_dev *vdev, size_t size,
if (dma_mapping_error(&vdev->dev, *dma_handle)) {
*dma_handle = 0;
- kzfree(buffer);
+ kfree_sensitive(buffer);
return NULL;
}
@@ -310,7 +310,7 @@ static void free_dma_buffer(struct vio_dev *vdev, size_t size, void *vaddr,
dma_unmap_single(&vdev->dev, dma_handle, size, DMA_BIDIRECTIONAL);
/* deallocate memory */
- kzfree(vaddr);
+ kfree_sensitive(vaddr);
}
/**
@@ -883,7 +883,7 @@ static int ibmvmc_close(struct inode *inode, struct file *file)
spin_unlock_irqrestore(&hmc->lock, flags);
}
- kzfree(session);
+ kfree_sensitive(session);
return rc;
}