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, 434 insertions, 0 deletions

diff --git a/drivers/crypto/qce/skcipher.c b/drivers/crypto/qce/skcipher.c
new file mode 100644
index 000000000..4931b064f
--- /dev/null
+++ b/drivers/crypto/qce/skcipher.c
@@ -0,0 +1,434 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2010-2014, The Linux Foundation. All rights reserved.
+ */
+
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/interrupt.h>
+#include <linux/moduleparam.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <crypto/aes.h>
+#include <crypto/internal/skcipher.h>
+
+#include "cipher.h"
+
+static unsigned int aes_sw_max_len = CONFIG_CRYPTO_DEV_QCE_SW_MAX_LEN;
+module_param(aes_sw_max_len, uint, 0644);
+MODULE_PARM_DESC(aes_sw_max_len,
+		 "Only use hardware for AES requests larger than this "
+		 "[0=always use hardware; anything <16 breaks AES-GCM; default="
+		 __stringify(CONFIG_CRYPTO_DEV_QCE_SW_MAX_LEN)"]");
+
+static LIST_HEAD(skcipher_algs);
+
+static void qce_skcipher_done(void *data)
+{
+	struct crypto_async_request *async_req = data;
+	struct skcipher_request *req = skcipher_request_cast(async_req);
+	struct qce_cipher_reqctx *rctx = skcipher_request_ctx(req);
+	struct qce_alg_template *tmpl = to_cipher_tmpl(crypto_skcipher_reqtfm(req));
+	struct qce_device *qce = tmpl->qce;
+	struct qce_result_dump *result_buf = qce->dma.result_buf;
+	enum dma_data_direction dir_src, dir_dst;
+	u32 status;
+	int error;
+	bool diff_dst;
+
+	diff_dst = (req->src != req->dst) ? true : false;
+	dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL;
+	dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL;
+
+	error = qce_dma_terminate_all(&qce->dma);
+	if (error)
+		dev_dbg(qce->dev, "skcipher dma termination error (%d)\n",
+			error);
+
+	if (diff_dst)
+		dma_unmap_sg(qce->dev, rctx->src_sg, rctx->src_nents, dir_src);
+	dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
+
+	sg_free_table(&rctx->dst_tbl);
+
+	error = qce_check_status(qce, &status);
+	if (error < 0)
+		dev_dbg(qce->dev, "skcipher operation error (%x)\n", status);
+
+	memcpy(rctx->iv, result_buf->encr_cntr_iv, rctx->ivsize);
+	qce->async_req_done(tmpl->qce, error);
+}
+
+static int
+qce_skcipher_async_req_handle(struct crypto_async_request *async_req)
+{
+	struct skcipher_request *req = skcipher_request_cast(async_req);
+	struct qce_cipher_reqctx *rctx = skcipher_request_ctx(req);
+	struct crypto_skcipher *skcipher = crypto_skcipher_reqtfm(req);
+	struct qce_alg_template *tmpl = to_cipher_tmpl(crypto_skcipher_reqtfm(req));
+	struct qce_device *qce = tmpl->qce;
+	enum dma_data_direction dir_src, dir_dst;
+	struct scatterlist *sg;
+	bool diff_dst;
+	gfp_t gfp;
+	int dst_nents, src_nents, ret;
+
+	rctx->iv = req->iv;
+	rctx->ivsize = crypto_skcipher_ivsize(skcipher);
+	rctx->cryptlen = req->cryptlen;
+
+	diff_dst = (req->src != req->dst) ? true : false;
+	dir_src = diff_dst ? DMA_TO_DEVICE : DMA_BIDIRECTIONAL;
+	dir_dst = diff_dst ? DMA_FROM_DEVICE : DMA_BIDIRECTIONAL;
+
+	rctx->src_nents = sg_nents_for_len(req->src, req->cryptlen);
+	if (diff_dst)
+		rctx->dst_nents = sg_nents_for_len(req->dst, req->cryptlen);
+	else
+		rctx->dst_nents = rctx->src_nents;
+	if (rctx->src_nents < 0) {
+		dev_err(qce->dev, "Invalid numbers of src SG.\n");
+		return rctx->src_nents;
+	}
+	if (rctx->dst_nents < 0) {
+		dev_err(qce->dev, "Invalid numbers of dst SG.\n");
+		return -rctx->dst_nents;
+	}
+
+	rctx->dst_nents += 1;
+
+	gfp = (req->base.flags & CRYPTO_TFM_REQ_MAY_SLEEP) ?
+						GFP_KERNEL : GFP_ATOMIC;
+
+	ret = sg_alloc_table(&rctx->dst_tbl, rctx->dst_nents, gfp);
+	if (ret)
+		return ret;
+
+	sg_init_one(&rctx->result_sg, qce->dma.result_buf, QCE_RESULT_BUF_SZ);
+
+	sg = qce_sgtable_add(&rctx->dst_tbl, req->dst, req->cryptlen);
+	if (IS_ERR(sg)) {
+		ret = PTR_ERR(sg);
+		goto error_free;
+	}
+
+	sg = qce_sgtable_add(&rctx->dst_tbl, &rctx->result_sg,
+			     QCE_RESULT_BUF_SZ);
+	if (IS_ERR(sg)) {
+		ret = PTR_ERR(sg);
+		goto error_free;
+	}
+
+	sg_mark_end(sg);
+	rctx->dst_sg = rctx->dst_tbl.sgl;
+
+	dst_nents = dma_map_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
+	if (!dst_nents) {
+		ret = -EIO;
+		goto error_free;
+	}
+
+	if (diff_dst) {
+		src_nents = dma_map_sg(qce->dev, req->src, rctx->src_nents, dir_src);
+		if (!src_nents) {
+			ret = -EIO;
+			goto error_unmap_dst;
+		}
+		rctx->src_sg = req->src;
+	} else {
+		rctx->src_sg = rctx->dst_sg;
+		src_nents = dst_nents - 1;
+	}
+
+	ret = qce_dma_prep_sgs(&qce->dma, rctx->src_sg, src_nents,
+			       rctx->dst_sg, dst_nents,
+			       qce_skcipher_done, async_req);
+	if (ret)
+		goto error_unmap_src;
+
+	qce_dma_issue_pending(&qce->dma);
+
+	ret = qce_start(async_req, tmpl->crypto_alg_type);
+	if (ret)
+		goto error_terminate;
+
+	return 0;
+
+error_terminate:
+	qce_dma_terminate_all(&qce->dma);
+error_unmap_src:
+	if (diff_dst)
+		dma_unmap_sg(qce->dev, req->src, rctx->src_nents, dir_src);
+error_unmap_dst:
+	dma_unmap_sg(qce->dev, rctx->dst_sg, rctx->dst_nents, dir_dst);
+error_free:
+	sg_free_table(&rctx->dst_tbl);
+	return ret;
+}
+
+static int qce_skcipher_setkey(struct crypto_skcipher *ablk, const u8 *key,
+				 unsigned int keylen)
+{
+	struct crypto_tfm *tfm = crypto_skcipher_tfm(ablk);
+	struct qce_cipher_ctx *ctx = crypto_tfm_ctx(tfm);
+	unsigned long flags = to_cipher_tmpl(ablk)->alg_flags;
+	unsigned int __keylen;
+	int ret;
+
+	if (!key || !keylen)
+		return -EINVAL;
+
+	/*
+	 * AES XTS key1 = key2 not supported by crypto engine.
+	 * Revisit to request a fallback cipher in this case.
+	 */
+	if (IS_XTS(flags)) {
+		__keylen = keylen >> 1;
+		if (!memcmp(key, key + __keylen, __keylen))
+			return -ENOKEY;
+	} else {
+		__keylen = keylen;
+	}
+
+	switch (__keylen) {
+	case AES_KEYSIZE_128:
+	case AES_KEYSIZE_256:
+		memcpy(ctx->enc_key, key, keylen);
+		break;
+	case AES_KEYSIZE_192:
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	ret = crypto_skcipher_setkey(ctx->fallback, key, keylen);
+	if (!ret)
+		ctx->enc_keylen = keylen;
+	return ret;
+}
+
+static int qce_skcipher_crypt(struct skcipher_request *req, int encrypt)
+{
+	struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
+	struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(tfm);
+	struct qce_cipher_reqctx *rctx = skcipher_request_ctx(req);
+	struct qce_alg_template *tmpl = to_cipher_tmpl(tfm);
+	unsigned int blocksize = crypto_skcipher_blocksize(tfm);
+	int keylen;
+
+	rctx->flags = tmpl->alg_flags;
+	rctx->flags |= encrypt ? QCE_ENCRYPT : QCE_DECRYPT;
+	keylen = IS_XTS(rctx->flags) ? ctx->enc_keylen >> 1 : ctx->enc_keylen;
+
+	/* CE does not handle 0 length messages */
+	if (!req->cryptlen)
+		return 0;
+
+	/*
+	 * ECB and CBC algorithms require message lengths to be
+	 * multiples of block size.
+	 */
+	if (IS_CBC(rctx->flags))
+		if (!IS_ALIGNED(req->cryptlen, blocksize))
+			return -EINVAL;
+
+	/*
+	 * Conditions for requesting a fallback cipher
+	 * AES-192 (not supported by crypto engine (CE))
+	 * AES-XTS request with len <= 512 byte (not recommended to use CE)
+	 * AES-XTS request with len > QCE_SECTOR_SIZE and
+	 * is not a multiple of it.(Revisit this condition to check if it is
+	 * needed in all versions of CE)
+	 */
+	if (IS_AES(rctx->flags) &&
+	    ((keylen != AES_KEYSIZE_128 && keylen != AES_KEYSIZE_256) ||
+	    (IS_XTS(rctx->flags) && ((req->cryptlen <= aes_sw_max_len) ||
+	    (req->cryptlen > QCE_SECTOR_SIZE &&
+	    req->cryptlen % QCE_SECTOR_SIZE))))) {
+		skcipher_request_set_tfm(&rctx->fallback_req, ctx->fallback);
+		skcipher_request_set_callback(&rctx->fallback_req,
+					      req->base.flags,
+					      req->base.complete,
+					      req->base.data);
+		skcipher_request_set_crypt(&rctx->fallback_req, req->src,
+					   req->dst, req->cryptlen, req->iv);
+		return encrypt ? crypto_skcipher_encrypt(&rctx->fallback_req) :
+				 crypto_skcipher_decrypt(&rctx->fallback_req);
+	}
+
+	return tmpl->qce->async_req_enqueue(tmpl->qce, &req->base);
+}
+
+static int qce_skcipher_encrypt(struct skcipher_request *req)
+{
+	return qce_skcipher_crypt(req, 1);
+}
+
+static int qce_skcipher_decrypt(struct skcipher_request *req)
+{
+	return qce_skcipher_crypt(req, 0);
+}
+
+static int qce_skcipher_init(struct crypto_skcipher *tfm)
+{
+	/* take the size without the fallback skcipher_request at the end */
+	crypto_skcipher_set_reqsize(tfm, offsetof(struct qce_cipher_reqctx,
+						  fallback_req));
+	return 0;
+}
+
+static int qce_skcipher_init_fallback(struct crypto_skcipher *tfm)
+{
+	struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(tfm);
+
+	ctx->fallback = crypto_alloc_skcipher(crypto_tfm_alg_name(&tfm->base),
+					      0, CRYPTO_ALG_NEED_FALLBACK);
+	if (IS_ERR(ctx->fallback))
+		return PTR_ERR(ctx->fallback);
+
+	crypto_skcipher_set_reqsize(tfm, sizeof(struct qce_cipher_reqctx) +
+					 crypto_skcipher_reqsize(ctx->fallback));
+	return 0;
+}
+
+static void qce_skcipher_exit(struct crypto_skcipher *tfm)
+{
+	struct qce_cipher_ctx *ctx = crypto_skcipher_ctx(tfm);
+
+	crypto_free_skcipher(ctx->fallback);
+}
+
+struct qce_skcipher_def {
+	unsigned long flags;
+	const char *name;
+	const char *drv_name;
+	unsigned int blocksize;
+	unsigned int chunksize;
+	unsigned int ivsize;
+	unsigned int min_keysize;
+	unsigned int max_keysize;
+};
+
+static const struct qce_skcipher_def skcipher_def[] = {
+	{
+		.flags		= QCE_ALG_AES | QCE_MODE_CBC,
+		.name		= "cbc(aes)",
+		.drv_name	= "cbc-aes-qce",
+		.blocksize	= AES_BLOCK_SIZE,
+		.ivsize		= AES_BLOCK_SIZE,
+		.min_keysize	= AES_MIN_KEY_SIZE,
+		.max_keysize	= AES_MAX_KEY_SIZE,
+	},
+	{
+		.flags		= QCE_ALG_AES | QCE_MODE_CTR,
+		.name		= "ctr(aes)",
+		.drv_name	= "ctr-aes-qce",
+		.blocksize	= 1,
+		.chunksize	= AES_BLOCK_SIZE,
+		.ivsize		= AES_BLOCK_SIZE,
+		.min_keysize	= AES_MIN_KEY_SIZE,
+		.max_keysize	= AES_MAX_KEY_SIZE,
+	},
+	{
+		.flags		= QCE_ALG_AES | QCE_MODE_XTS,
+		.name		= "xts(aes)",
+		.drv_name	= "xts-aes-qce",
+		.blocksize	= AES_BLOCK_SIZE,
+		.ivsize		= AES_BLOCK_SIZE,
+		.min_keysize	= AES_MIN_KEY_SIZE * 2,
+		.max_keysize	= AES_MAX_KEY_SIZE * 2,
+	},
+};
+
+static int qce_skcipher_register_one(const struct qce_skcipher_def *def,
+				       struct qce_device *qce)
+{
+	struct qce_alg_template *tmpl;
+	struct skcipher_alg *alg;
+	int ret;
+
+	tmpl = kzalloc_obj(*tmpl);
+	if (!tmpl)
+		return -ENOMEM;
+
+	alg = &tmpl->alg.skcipher;
+
+	strscpy(alg->base.cra_name, def->name);
+	strscpy(alg->base.cra_driver_name, def->drv_name);
+
+	alg->base.cra_blocksize		= def->blocksize;
+	alg->chunksize			= def->chunksize;
+	alg->ivsize			= def->ivsize;
+	alg->min_keysize		= def->min_keysize;
+	alg->max_keysize		= def->max_keysize;
+	alg->setkey			= qce_skcipher_setkey;
+	alg->encrypt			= qce_skcipher_encrypt;
+	alg->decrypt			= qce_skcipher_decrypt;
+
+	alg->base.cra_priority		= 275;
+	alg->base.cra_flags		= CRYPTO_ALG_ASYNC |
+					  CRYPTO_ALG_ALLOCATES_MEMORY |
+					  CRYPTO_ALG_KERN_DRIVER_ONLY;
+	alg->base.cra_ctxsize		= sizeof(struct qce_cipher_ctx);
+	alg->base.cra_alignmask		= 0;
+	alg->base.cra_module		= THIS_MODULE;
+
+	if (IS_AES(def->flags)) {
+		alg->base.cra_flags    |= CRYPTO_ALG_NEED_FALLBACK;
+		alg->init		= qce_skcipher_init_fallback;
+		alg->exit		= qce_skcipher_exit;
+	} else {
+		alg->init		= qce_skcipher_init;
+	}
+
+	INIT_LIST_HEAD(&tmpl->entry);
+	tmpl->crypto_alg_type = CRYPTO_ALG_TYPE_SKCIPHER;
+	tmpl->alg_flags = def->flags;
+	tmpl->qce = qce;
+
+	ret = crypto_register_skcipher(alg);
+	if (ret) {
+		dev_err(qce->dev, "%s registration failed\n", alg->base.cra_name);
+		kfree(tmpl);
+		return ret;
+	}
+
+	list_add_tail(&tmpl->entry, &skcipher_algs);
+	dev_dbg(qce->dev, "%s is registered\n", alg->base.cra_name);
+	return 0;
+}
+
+static void qce_skcipher_unregister(struct qce_device *qce)
+{
+	struct qce_alg_template *tmpl, *n;
+
+	list_for_each_entry_safe(tmpl, n, &skcipher_algs, entry) {
+		crypto_unregister_skcipher(&tmpl->alg.skcipher);
+		list_del(&tmpl->entry);
+		kfree(tmpl);
+	}
+}
+
+static int qce_skcipher_register(struct qce_device *qce)
+{
+	int ret, i;
+
+	for (i = 0; i < ARRAY_SIZE(skcipher_def); i++) {
+		ret = qce_skcipher_register_one(&skcipher_def[i], qce);
+		if (ret)
+			goto err;
+	}
+
+	return 0;
+err:
+	qce_skcipher_unregister(qce);
+	return ret;
+}
+
+const struct qce_algo_ops skcipher_ops = {
+	.type = CRYPTO_ALG_TYPE_SKCIPHER,
+	.register_algs = qce_skcipher_register,
+	.unregister_algs = qce_skcipher_unregister,
+	.async_req_handle = qce_skcipher_async_req_handle,
+};