Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 520 insertions, 0 deletions

diff --git a/net/ceph/crypto.c b/net/ceph/crypto.c
new file mode 100644
index 000000000..de7496791
--- /dev/null
+++ b/net/ceph/crypto.c
@@ -0,0 +1,520 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/ceph/ceph_debug.h>
+
+#include <linux/err.h>
+#include <linux/scatterlist.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <crypto/aes.h>
+#include <crypto/krb5.h>
+#include <crypto/skcipher.h>
+#include <linux/key-type.h>
+#include <linux/sched/mm.h>
+
+#include <keys/ceph-type.h>
+#include <keys/user-type.h>
+#include <linux/ceph/decode.h>
+#include "crypto.h"
+
+static int set_aes_tfm(struct ceph_crypto_key *key)
+{
+	unsigned int noio_flag;
+	int ret;
+
+	noio_flag = memalloc_noio_save();
+	key->aes_tfm = crypto_alloc_sync_skcipher("cbc(aes)", 0, 0);
+	memalloc_noio_restore(noio_flag);
+	if (IS_ERR(key->aes_tfm)) {
+		ret = PTR_ERR(key->aes_tfm);
+		key->aes_tfm = NULL;
+		return ret;
+	}
+
+	ret = crypto_sync_skcipher_setkey(key->aes_tfm, key->key, key->len);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
+static int set_krb5_tfms(struct ceph_crypto_key *key, const u32 *key_usages,
+			 int key_usage_cnt)
+{
+	struct krb5_buffer TK = { .len = key->len, .data = key->key };
+	unsigned int noio_flag;
+	int ret = 0;
+	int i;
+
+	if (WARN_ON_ONCE(key_usage_cnt > ARRAY_SIZE(key->krb5_tfms)))
+		return -EINVAL;
+
+	key->krb5_type = crypto_krb5_find_enctype(
+			     KRB5_ENCTYPE_AES256_CTS_HMAC_SHA384_192);
+	if (!key->krb5_type)
+		return -ENOPKG;
+
+	/*
+	 * Despite crypto_krb5_prepare_encryption() taking a gfp mask,
+	 * crypto_alloc_aead() inside of it allocates with GFP_KERNEL.
+	 */
+	noio_flag = memalloc_noio_save();
+	for (i = 0; i < key_usage_cnt; i++) {
+		key->krb5_tfms[i] = crypto_krb5_prepare_encryption(
+					key->krb5_type, &TK, key_usages[i],
+					GFP_NOIO);
+		if (IS_ERR(key->krb5_tfms[i])) {
+			ret = PTR_ERR(key->krb5_tfms[i]);
+			key->krb5_tfms[i] = NULL;
+			goto out_flag;
+		}
+	}
+
+out_flag:
+	memalloc_noio_restore(noio_flag);
+	return ret;
+}
+
+int ceph_crypto_key_prepare(struct ceph_crypto_key *key,
+			    const u32 *key_usages, int key_usage_cnt)
+{
+	switch (key->type) {
+	case CEPH_CRYPTO_NONE:
+		return 0; /* nothing to do */
+	case CEPH_CRYPTO_AES:
+		return set_aes_tfm(key);
+	case CEPH_CRYPTO_AES256KRB5:
+		hmac_sha256_preparekey(&key->hmac_key, key->key, key->len);
+		return set_krb5_tfms(key, key_usages, key_usage_cnt);
+	default:
+		return -ENOTSUPP;
+	}
+}
+
+/*
+ * @dst should be zeroed before this function is called.
+ */
+int ceph_crypto_key_clone(struct ceph_crypto_key *dst,
+			  const struct ceph_crypto_key *src)
+{
+	dst->type = src->type;
+	dst->created = src->created;
+	dst->len = src->len;
+
+	dst->key = kmemdup(src->key, src->len, GFP_NOIO);
+	if (!dst->key)
+		return -ENOMEM;
+
+	return 0;
+}
+
+/*
+ * @key should be zeroed before this function is called.
+ */
+int ceph_crypto_key_decode(struct ceph_crypto_key *key, void **p, void *end)
+{
+	ceph_decode_need(p, end, 2*sizeof(u16) + sizeof(key->created), bad);
+	key->type = ceph_decode_16(p);
+	ceph_decode_copy(p, &key->created, sizeof(key->created));
+	key->len = ceph_decode_16(p);
+	ceph_decode_need(p, end, key->len, bad);
+	if (key->len > CEPH_MAX_KEY_LEN) {
+		pr_err("secret too big %d\n", key->len);
+		return -EINVAL;
+	}
+
+	key->key = kmemdup(*p, key->len, GFP_NOIO);
+	if (!key->key)
+		return -ENOMEM;
+
+	memzero_explicit(*p, key->len);
+	*p += key->len;
+	return 0;
+
+bad:
+	dout("failed to decode crypto key\n");
+	return -EINVAL;
+}
+
+int ceph_crypto_key_unarmor(struct ceph_crypto_key *key, const char *inkey)
+{
+	int inlen = strlen(inkey);
+	int blen = inlen * 3 / 4;
+	void *buf, *p;
+	int ret;
+
+	dout("crypto_key_unarmor %s\n", inkey);
+	buf = kmalloc(blen, GFP_NOFS);
+	if (!buf)
+		return -ENOMEM;
+	blen = ceph_unarmor(buf, inkey, inkey+inlen);
+	if (blen < 0) {
+		kfree(buf);
+		return blen;
+	}
+
+	p = buf;
+	ret = ceph_crypto_key_decode(key, &p, p + blen);
+	kfree(buf);
+	if (ret)
+		return ret;
+	dout("crypto_key_unarmor key %p type %d len %d\n", key,
+	     key->type, key->len);
+	return 0;
+}
+
+void ceph_crypto_key_destroy(struct ceph_crypto_key *key)
+{
+	int i;
+
+	if (!key)
+		return;
+
+	kfree_sensitive(key->key);
+	key->key = NULL;
+
+	if (key->type == CEPH_CRYPTO_AES) {
+		if (key->aes_tfm) {
+			crypto_free_sync_skcipher(key->aes_tfm);
+			key->aes_tfm = NULL;
+		}
+	} else if (key->type == CEPH_CRYPTO_AES256KRB5) {
+		memzero_explicit(&key->hmac_key, sizeof(key->hmac_key));
+		for (i = 0; i < ARRAY_SIZE(key->krb5_tfms); i++) {
+			if (key->krb5_tfms[i]) {
+				crypto_free_aead(key->krb5_tfms[i]);
+				key->krb5_tfms[i] = NULL;
+			}
+		}
+	}
+}
+
+static const u8 *aes_iv = (u8 *)CEPH_AES_IV;
+
+/*
+ * Should be used for buffers allocated with kvmalloc().
+ * Currently these are encrypt out-buffer (ceph_buffer) and decrypt
+ * in-buffer (msg front).
+ *
+ * Dispose of @sgt with teardown_sgtable().
+ *
+ * @prealloc_sg is to avoid memory allocation inside sg_alloc_table()
+ * in cases where a single sg is sufficient.  No attempt to reduce the
+ * number of sgs by squeezing physically contiguous pages together is
+ * made though, for simplicity.
+ */
+static int setup_sgtable(struct sg_table *sgt, struct scatterlist *prealloc_sg,
+			 const void *buf, unsigned int buf_len)
+{
+	struct scatterlist *sg;
+	const bool is_vmalloc = is_vmalloc_addr(buf);
+	unsigned int off = offset_in_page(buf);
+	unsigned int chunk_cnt = 1;
+	unsigned int chunk_len = PAGE_ALIGN(off + buf_len);
+	int i;
+	int ret;
+
+	if (buf_len == 0) {
+		memset(sgt, 0, sizeof(*sgt));
+		return -EINVAL;
+	}
+
+	if (is_vmalloc) {
+		chunk_cnt = chunk_len >> PAGE_SHIFT;
+		chunk_len = PAGE_SIZE;
+	}
+
+	if (chunk_cnt > 1) {
+		ret = sg_alloc_table(sgt, chunk_cnt, GFP_NOFS);
+		if (ret)
+			return ret;
+	} else {
+		WARN_ON(chunk_cnt != 1);
+		sg_init_table(prealloc_sg, 1);
+		sgt->sgl = prealloc_sg;
+		sgt->nents = sgt->orig_nents = 1;
+	}
+
+	for_each_sg(sgt->sgl, sg, sgt->orig_nents, i) {
+		struct page *page;
+		unsigned int len = min(chunk_len - off, buf_len);
+
+		if (is_vmalloc)
+			page = vmalloc_to_page(buf);
+		else
+			page = virt_to_page(buf);
+
+		sg_set_page(sg, page, len, off);
+
+		off = 0;
+		buf += len;
+		buf_len -= len;
+	}
+	WARN_ON(buf_len != 0);
+
+	return 0;
+}
+
+static void teardown_sgtable(struct sg_table *sgt)
+{
+	if (sgt->orig_nents > 1)
+		sg_free_table(sgt);
+}
+
+static int ceph_aes_crypt(const struct ceph_crypto_key *key, bool encrypt,
+			  void *buf, int buf_len, int in_len, int *pout_len)
+{
+	SYNC_SKCIPHER_REQUEST_ON_STACK(req, key->aes_tfm);
+	struct sg_table sgt;
+	struct scatterlist prealloc_sg;
+	char iv[AES_BLOCK_SIZE] __aligned(8);
+	int pad_byte = AES_BLOCK_SIZE - (in_len & (AES_BLOCK_SIZE - 1));
+	int crypt_len = encrypt ? in_len + pad_byte : in_len;
+	int ret;
+
+	WARN_ON(crypt_len > buf_len);
+	if (encrypt)
+		memset(buf + in_len, pad_byte, pad_byte);
+	ret = setup_sgtable(&sgt, &prealloc_sg, buf, crypt_len);
+	if (ret)
+		return ret;
+
+	memcpy(iv, aes_iv, AES_BLOCK_SIZE);
+	skcipher_request_set_sync_tfm(req, key->aes_tfm);
+	skcipher_request_set_callback(req, 0, NULL, NULL);
+	skcipher_request_set_crypt(req, sgt.sgl, sgt.sgl, crypt_len, iv);
+
+	/*
+	print_hex_dump(KERN_ERR, "key: ", DUMP_PREFIX_NONE, 16, 1,
+		       key->key, key->len, 1);
+	print_hex_dump(KERN_ERR, " in: ", DUMP_PREFIX_NONE, 16, 1,
+		       buf, crypt_len, 1);
+	*/
+	if (encrypt)
+		ret = crypto_skcipher_encrypt(req);
+	else
+		ret = crypto_skcipher_decrypt(req);
+	skcipher_request_zero(req);
+	if (ret) {
+		pr_err("%s %scrypt failed: %d\n", __func__,
+		       encrypt ? "en" : "de", ret);
+		goto out_sgt;
+	}
+	/*
+	print_hex_dump(KERN_ERR, "out: ", DUMP_PREFIX_NONE, 16, 1,
+		       buf, crypt_len, 1);
+	*/
+
+	if (encrypt) {
+		*pout_len = crypt_len;
+	} else {
+		pad_byte = *(char *)(buf + in_len - 1);
+		if (pad_byte > 0 && pad_byte <= AES_BLOCK_SIZE &&
+		    in_len >= pad_byte) {
+			*pout_len = in_len - pad_byte;
+		} else {
+			pr_err("%s got bad padding %d on in_len %d\n",
+			       __func__, pad_byte, in_len);
+			ret = -EPERM;
+			goto out_sgt;
+		}
+	}
+
+out_sgt:
+	teardown_sgtable(&sgt);
+	return ret;
+}
+
+static int ceph_krb5_encrypt(const struct ceph_crypto_key *key, int usage_slot,
+			     void *buf, int buf_len, int in_len, int *pout_len)
+{
+	struct sg_table sgt;
+	struct scatterlist prealloc_sg;
+	int ret;
+
+	if (WARN_ON_ONCE(usage_slot >= ARRAY_SIZE(key->krb5_tfms)))
+		return -EINVAL;
+
+	ret = setup_sgtable(&sgt, &prealloc_sg, buf, buf_len);
+	if (ret)
+		return ret;
+
+	ret = crypto_krb5_encrypt(key->krb5_type, key->krb5_tfms[usage_slot],
+				  sgt.sgl, sgt.nents, buf_len, AES_BLOCK_SIZE,
+				  in_len, false);
+	if (ret < 0) {
+		pr_err("%s encrypt failed: %d\n", __func__, ret);
+		goto out_sgt;
+	}
+
+	*pout_len = ret;
+	ret = 0;
+
+out_sgt:
+	teardown_sgtable(&sgt);
+	return ret;
+}
+
+static int ceph_krb5_decrypt(const struct ceph_crypto_key *key, int usage_slot,
+			     void *buf, int buf_len, int in_len, int *pout_len)
+{
+	struct sg_table sgt;
+	struct scatterlist prealloc_sg;
+	size_t data_off = 0;
+	size_t data_len = in_len;
+	int ret;
+
+	if (WARN_ON_ONCE(usage_slot >= ARRAY_SIZE(key->krb5_tfms)))
+		return -EINVAL;
+
+	ret = setup_sgtable(&sgt, &prealloc_sg, buf, in_len);
+	if (ret)
+		return ret;
+
+	ret = crypto_krb5_decrypt(key->krb5_type, key->krb5_tfms[usage_slot],
+				  sgt.sgl, sgt.nents, &data_off, &data_len);
+	if (ret) {
+		pr_err("%s decrypt failed: %d\n", __func__, ret);
+		goto out_sgt;
+	}
+
+	WARN_ON(data_off != AES_BLOCK_SIZE);
+	*pout_len = data_len;
+
+out_sgt:
+	teardown_sgtable(&sgt);
+	return ret;
+}
+
+int ceph_crypt(const struct ceph_crypto_key *key, int usage_slot, bool encrypt,
+	       void *buf, int buf_len, int in_len, int *pout_len)
+{
+	switch (key->type) {
+	case CEPH_CRYPTO_NONE:
+		*pout_len = in_len;
+		return 0;
+	case CEPH_CRYPTO_AES:
+		return ceph_aes_crypt(key, encrypt, buf, buf_len, in_len,
+				      pout_len);
+	case CEPH_CRYPTO_AES256KRB5:
+		return encrypt ?
+		    ceph_krb5_encrypt(key, usage_slot, buf, buf_len, in_len,
+				      pout_len) :
+		    ceph_krb5_decrypt(key, usage_slot, buf, buf_len, in_len,
+				      pout_len);
+	default:
+		return -ENOTSUPP;
+	}
+}
+
+int ceph_crypt_data_offset(const struct ceph_crypto_key *key)
+{
+	switch (key->type) {
+	case CEPH_CRYPTO_NONE:
+	case CEPH_CRYPTO_AES:
+		return 0;
+	case CEPH_CRYPTO_AES256KRB5:
+		/* confounder */
+		return AES_BLOCK_SIZE;
+	default:
+		BUG();
+	}
+}
+
+int ceph_crypt_buflen(const struct ceph_crypto_key *key, int data_len)
+{
+	switch (key->type) {
+	case CEPH_CRYPTO_NONE:
+		return data_len;
+	case CEPH_CRYPTO_AES:
+		/* PKCS#7 padding at the end */
+		return data_len + AES_BLOCK_SIZE -
+		       (data_len & (AES_BLOCK_SIZE - 1));
+	case CEPH_CRYPTO_AES256KRB5:
+		/* confounder at the beginning and 192-bit HMAC at the end */
+		return AES_BLOCK_SIZE + data_len + 24;
+	default:
+		BUG();
+	}
+}
+
+void ceph_hmac_sha256(const struct ceph_crypto_key *key, const void *buf,
+		      int buf_len, u8 hmac[SHA256_DIGEST_SIZE])
+{
+	switch (key->type) {
+	case CEPH_CRYPTO_NONE:
+	case CEPH_CRYPTO_AES:
+		memset(hmac, 0, SHA256_DIGEST_SIZE);
+		return;
+	case CEPH_CRYPTO_AES256KRB5:
+		hmac_sha256(&key->hmac_key, buf, buf_len, hmac);
+		return;
+	default:
+		BUG();
+	}
+}
+
+static int ceph_key_preparse(struct key_preparsed_payload *prep)
+{
+	struct ceph_crypto_key *ckey;
+	size_t datalen = prep->datalen;
+	int ret;
+	void *p;
+
+	ret = -EINVAL;
+	if (datalen <= 0 || datalen > 32767 || !prep->data)
+		goto err;
+
+	ret = -ENOMEM;
+	ckey = kzalloc_obj(*ckey);
+	if (!ckey)
+		goto err;
+
+	/* TODO ceph_crypto_key_decode should really take const input */
+	p = (void *)prep->data;
+	ret = ceph_crypto_key_decode(ckey, &p, (char*)prep->data+datalen);
+	if (ret < 0)
+		goto err_ckey;
+
+	prep->payload.data[0] = ckey;
+	prep->quotalen = datalen;
+	return 0;
+
+err_ckey:
+	kfree(ckey);
+err:
+	return ret;
+}
+
+static void ceph_key_free_preparse(struct key_preparsed_payload *prep)
+{
+	struct ceph_crypto_key *ckey = prep->payload.data[0];
+	ceph_crypto_key_destroy(ckey);
+	kfree(ckey);
+}
+
+static void ceph_key_destroy(struct key *key)
+{
+	struct ceph_crypto_key *ckey = key->payload.data[0];
+
+	ceph_crypto_key_destroy(ckey);
+	kfree(ckey);
+}
+
+struct key_type key_type_ceph = {
+	.name		= "ceph",
+	.preparse	= ceph_key_preparse,
+	.free_preparse	= ceph_key_free_preparse,
+	.instantiate	= generic_key_instantiate,
+	.destroy	= ceph_key_destroy,
+};
+
+int __init ceph_crypto_init(void)
+{
+	return register_key_type(&key_type_ceph);
+}
+
+void ceph_crypto_shutdown(void)
+{
+	unregister_key_type(&key_type_ceph);
+}