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, 311 insertions, 0 deletions

diff --git a/drivers/crypto/ccp/sfs.c b/drivers/crypto/ccp/sfs.c
new file mode 100644
index 000000000..a47778397
--- /dev/null
+++ b/drivers/crypto/ccp/sfs.c
@@ -0,0 +1,311 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * AMD Secure Processor Seamless Firmware Servicing support.
+ *
+ * Copyright (C) 2025 Advanced Micro Devices, Inc.
+ *
+ * Author: Ashish Kalra <ashish.kalra@amd.com>
+ */
+
+#include <linux/firmware.h>
+
+#include "sfs.h"
+#include "sev-dev.h"
+
+#define SFS_DEFAULT_TIMEOUT		(10 * MSEC_PER_SEC)
+#define SFS_MAX_PAYLOAD_SIZE		(2 * 1024 * 1024)
+#define SFS_NUM_2MB_PAGES_CMDBUF	(SFS_MAX_PAYLOAD_SIZE / PMD_SIZE)
+#define SFS_NUM_PAGES_CMDBUF		(SFS_MAX_PAYLOAD_SIZE / PAGE_SIZE)
+
+static DEFINE_MUTEX(sfs_ioctl_mutex);
+
+static struct sfs_misc_dev *misc_dev;
+
+static int send_sfs_cmd(struct sfs_device *sfs_dev, int msg)
+{
+	int ret;
+
+	sfs_dev->command_buf->hdr.status = 0;
+	sfs_dev->command_buf->hdr.sub_cmd_id = msg;
+
+	ret = psp_extended_mailbox_cmd(sfs_dev->psp,
+				       SFS_DEFAULT_TIMEOUT,
+				       (struct psp_ext_request *)sfs_dev->command_buf);
+	if (ret == -EIO) {
+		dev_dbg(sfs_dev->dev,
+			 "msg 0x%x failed with PSP error: 0x%x, extended status: 0x%x\n",
+			 msg, sfs_dev->command_buf->hdr.status,
+			 *(u32 *)sfs_dev->command_buf->buf);
+	}
+
+	return ret;
+}
+
+static int send_sfs_get_fw_versions(struct sfs_device *sfs_dev)
+{
+	/*
+	 * SFS_GET_FW_VERSIONS command needs the output buffer to be
+	 * initialized to 0xC7 in every byte.
+	 */
+	memset(sfs_dev->command_buf->sfs_buffer, 0xc7, PAGE_SIZE);
+	sfs_dev->command_buf->hdr.payload_size = 2 * PAGE_SIZE;
+
+	return send_sfs_cmd(sfs_dev, PSP_SFS_GET_FW_VERSIONS);
+}
+
+static int send_sfs_update_package(struct sfs_device *sfs_dev, const char *payload_name)
+{
+	char payload_path[PAYLOAD_NAME_SIZE + sizeof("amd/")];
+	const struct firmware *firmware;
+	unsigned long package_size;
+	int ret;
+
+	/* Sanitize userspace provided payload name */
+	if (!strnchr(payload_name, PAYLOAD_NAME_SIZE, '\0'))
+		return -EINVAL;
+
+	snprintf(payload_path, sizeof(payload_path), "amd/%s", payload_name);
+
+	ret = firmware_request_nowarn(&firmware, payload_path, sfs_dev->dev);
+	if (ret < 0) {
+		dev_warn_ratelimited(sfs_dev->dev, "firmware request failed for %s (%d)\n",
+				     payload_path, ret);
+		return -ENOENT;
+	}
+
+	/*
+	 * SFS Update Package command's input buffer contains TEE_EXT_CMD_BUFFER
+	 * followed by the Update Package and it should be 64KB aligned.
+	 */
+	package_size = ALIGN(firmware->size + PAGE_SIZE, 0x10000U);
+
+	/*
+	 * SFS command buffer is a pre-allocated 2MB buffer, fail update package
+	 * if SFS payload is larger than the pre-allocated command buffer.
+	 */
+	if (package_size > SFS_MAX_PAYLOAD_SIZE) {
+		dev_warn_ratelimited(sfs_dev->dev,
+			 "SFS payload size %ld larger than maximum supported payload size of %u\n",
+			 package_size, SFS_MAX_PAYLOAD_SIZE);
+		release_firmware(firmware);
+		return -E2BIG;
+	}
+
+	/*
+	 * Copy firmware data to a HV_Fixed memory region.
+	 */
+	memcpy(sfs_dev->command_buf->sfs_buffer, firmware->data, firmware->size);
+	sfs_dev->command_buf->hdr.payload_size = package_size;
+
+	release_firmware(firmware);
+
+	return send_sfs_cmd(sfs_dev, PSP_SFS_UPDATE);
+}
+
+static long sfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	struct sfs_user_get_fw_versions __user *sfs_get_fw_versions;
+	struct sfs_user_update_package __user *sfs_update_package;
+	struct psp_device *psp_master = psp_get_master_device();
+	char payload_name[PAYLOAD_NAME_SIZE];
+	struct sfs_device *sfs_dev;
+	int ret = 0;
+
+	if (!psp_master || !psp_master->sfs_data)
+		return -ENODEV;
+
+	sfs_dev = psp_master->sfs_data;
+
+	guard(mutex)(&sfs_ioctl_mutex);
+
+	switch (cmd) {
+	case SFSIOCFWVERS:
+		dev_dbg(sfs_dev->dev, "in SFSIOCFWVERS\n");
+
+		sfs_get_fw_versions = (struct sfs_user_get_fw_versions __user *)arg;
+
+		ret = send_sfs_get_fw_versions(sfs_dev);
+		if (ret && ret != -EIO)
+			return ret;
+
+		/*
+		 * Return SFS status and extended status back to userspace
+		 * if PSP status indicated success or command error.
+		 */
+		if (copy_to_user(&sfs_get_fw_versions->blob, sfs_dev->command_buf->sfs_buffer,
+				 PAGE_SIZE))
+			return -EFAULT;
+		if (copy_to_user(&sfs_get_fw_versions->sfs_status,
+				 &sfs_dev->command_buf->hdr.status,
+				 sizeof(sfs_get_fw_versions->sfs_status)))
+			return -EFAULT;
+		if (copy_to_user(&sfs_get_fw_versions->sfs_extended_status,
+				 &sfs_dev->command_buf->buf,
+				 sizeof(sfs_get_fw_versions->sfs_extended_status)))
+			return -EFAULT;
+		break;
+	case SFSIOCUPDATEPKG:
+		dev_dbg(sfs_dev->dev, "in SFSIOCUPDATEPKG\n");
+
+		sfs_update_package = (struct sfs_user_update_package __user *)arg;
+
+		if (copy_from_user(payload_name, sfs_update_package->payload_name,
+				   PAYLOAD_NAME_SIZE))
+			return -EFAULT;
+
+		ret = send_sfs_update_package(sfs_dev, payload_name);
+		if (ret && ret != -EIO)
+			return ret;
+
+		/*
+		 * Return SFS status and extended status back to userspace
+		 * if PSP status indicated success or command error.
+		 */
+		if (copy_to_user(&sfs_update_package->sfs_status,
+				 &sfs_dev->command_buf->hdr.status,
+				 sizeof(sfs_update_package->sfs_status)))
+			return -EFAULT;
+		if (copy_to_user(&sfs_update_package->sfs_extended_status,
+				 &sfs_dev->command_buf->buf,
+				 sizeof(sfs_update_package->sfs_extended_status)))
+			return -EFAULT;
+		break;
+	default:
+		ret = -EINVAL;
+	}
+
+	return ret;
+}
+
+static const struct file_operations sfs_fops = {
+	.owner	= THIS_MODULE,
+	.unlocked_ioctl = sfs_ioctl,
+};
+
+static void sfs_exit(struct kref *ref)
+{
+	misc_deregister(&misc_dev->misc);
+	kfree(misc_dev);
+	misc_dev = NULL;
+}
+
+void sfs_dev_destroy(struct psp_device *psp)
+{
+	struct sfs_device *sfs_dev = psp->sfs_data;
+
+	if (!sfs_dev)
+		return;
+
+	/*
+	 * Change SFS command buffer back to the default "Write-Back" type.
+	 */
+	set_memory_wb((unsigned long)sfs_dev->command_buf, SFS_NUM_PAGES_CMDBUF);
+
+	snp_free_hv_fixed_pages(sfs_dev->page);
+
+	if (sfs_dev->misc)
+		kref_put(&misc_dev->refcount, sfs_exit);
+
+	psp->sfs_data = NULL;
+}
+
+/* Based on sev_misc_init() */
+static int sfs_misc_init(struct sfs_device *sfs)
+{
+	struct device *dev = sfs->dev;
+	int ret;
+
+	/*
+	 * SFS feature support can be detected on multiple devices but the SFS
+	 * FW commands must be issued on the master. During probe, we do not
+	 * know the master hence we create /dev/sfs on the first device probe.
+	 */
+	if (!misc_dev) {
+		struct miscdevice *misc;
+
+		misc_dev = kzalloc_obj(*misc_dev);
+		if (!misc_dev)
+			return -ENOMEM;
+
+		misc = &misc_dev->misc;
+		misc->minor = MISC_DYNAMIC_MINOR;
+		misc->name = "sfs";
+		misc->fops = &sfs_fops;
+		misc->mode = 0600;
+
+		ret = misc_register(misc);
+		if (ret)
+			return ret;
+
+		kref_init(&misc_dev->refcount);
+	} else {
+		kref_get(&misc_dev->refcount);
+	}
+
+	sfs->misc = misc_dev;
+	dev_dbg(dev, "registered SFS device\n");
+
+	return 0;
+}
+
+int sfs_dev_init(struct psp_device *psp)
+{
+	struct device *dev = psp->dev;
+	struct sfs_device *sfs_dev;
+	struct page *page;
+	int ret = -ENOMEM;
+
+	sfs_dev = devm_kzalloc(dev, sizeof(*sfs_dev), GFP_KERNEL);
+	if (!sfs_dev)
+		return -ENOMEM;
+
+	/*
+	 * Pre-allocate 2MB command buffer for all SFS commands using
+	 * SNP HV_Fixed page allocator which also transitions the
+	 * SFS command buffer to HV_Fixed page state if SNP is enabled.
+	 */
+	page = snp_alloc_hv_fixed_pages(SFS_NUM_2MB_PAGES_CMDBUF);
+	if (!page) {
+		dev_dbg(dev, "Command Buffer HV-Fixed page allocation failed\n");
+		goto cleanup_dev;
+	}
+	sfs_dev->page = page;
+	sfs_dev->command_buf = page_address(page);
+
+	dev_dbg(dev, "Command buffer 0x%px to be marked as HV_Fixed\n", sfs_dev->command_buf);
+
+	/*
+	 * SFS command buffer must be mapped as non-cacheable.
+	 */
+	ret = set_memory_uc((unsigned long)sfs_dev->command_buf, SFS_NUM_PAGES_CMDBUF);
+	if (ret) {
+		dev_dbg(dev, "Set memory uc failed\n");
+		goto cleanup_cmd_buf;
+	}
+
+	dev_dbg(dev, "Command buffer 0x%px marked uncacheable\n", sfs_dev->command_buf);
+
+	psp->sfs_data = sfs_dev;
+	sfs_dev->dev = dev;
+	sfs_dev->psp = psp;
+
+	ret = sfs_misc_init(sfs_dev);
+	if (ret)
+		goto cleanup_mem_attr;
+
+	dev_notice(sfs_dev->dev, "SFS support is available\n");
+
+	return 0;
+
+cleanup_mem_attr:
+	set_memory_wb((unsigned long)sfs_dev->command_buf, SFS_NUM_PAGES_CMDBUF);
+
+cleanup_cmd_buf:
+	snp_free_hv_fixed_pages(page);
+
+cleanup_dev:
+	psp->sfs_data = NULL;
+	devm_kfree(dev, sfs_dev);
+
+	return ret;
+}