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* [PATCH v6 0/8] firmware: add partial read support in request_firmware_into_buf
@ 2020-06-05 22:59 Scott Branden
  2020-06-05 22:59 ` [PATCH v6 1/8] fs: introduce kernel_pread_file* support Scott Branden
                   ` (6 more replies)
  0 siblings, 7 replies; 13+ messages in thread
From: Scott Branden @ 2020-06-05 22:59 UTC (permalink / raw)
  To: Luis Chamberlain, Greg Kroah-Hartman, David Brown,
	Alexander Viro, Shuah Khan, bjorn.andersson, Shuah Khan,
	Arnd Bergmann
  Cc: Mimi Zohar, Rafael J . Wysocki, linux-kernel, linux-arm-msm,
	linux-fsdevel, BCM Kernel Feedback, Olof Johansson,
	Andrew Morton, Dan Carpenter, Colin Ian King, Kees Cook,
	Takashi Iwai, linux-kselftest, Andy Gross, linux-integrity,
	linux-security-module, Scott Branden

This patch series adds partial read support in request_firmware_into_buf.
In order to accept the enhanced API it has been requested that kernel
selftests and upstreamed driver utilize the API enhancement and so
are included in this patch series.

Also in this patch series is the addition of a new Broadcom VK driver
utilizing the new request_firmware_into_buf enhanced API.

Further comment followed to add IMA support of the partial reads
originating from request_firmware_into_buf calls.

Changes from v5:
 - add IMA FIRMWARE_PARTIAL_READ support
 - change kernel pread flags to enum
 - removed legacy support from driver
 - driver fixes
Changes from v4:
 - handle reset issues if card crashes
 - allow driver to have min required msix
 - add card utilization information
Changes from v3:
 - fix sparse warnings
 - fix printf format specifiers for size_t
 - fix 32-bit cross-compiling reports 32-bit shifts
 - use readl/writel,_relaxed to access pci ioremap memory,
  removed memory barriers and volatile keyword with such change
 - driver optimizations for interrupt/poll functionalities
Changes from v2:
 - remove unnecessary code and mutex locks in lib/test_firmware.c
 - remove VK_IOCTL_ACCESS_BAR support from driver and use pci sysfs instead
 - remove bitfields
 - remove Kconfig default m
 - adjust formatting and some naming based on feedback
 - fix error handling conditions
 - use appropriate return codes
 - use memcpy_toio instead of direct access to PCIE bar

Scott Branden (8):
  fs: introduce kernel_pread_file* support
  firmware: add offset to request_firmware_into_buf
  test_firmware: add partial read support for request_firmware_into_buf
  firmware: test partial file reads of request_firmware_into_buf
  bcm-vk: add bcm_vk UAPI
  misc: bcm-vk: add Broadcom VK driver
  MAINTAINERS: bcm-vk: add maintainer for Broadcom VK Driver
  ima: add FIRMWARE_PARTIAL_READ support

 MAINTAINERS                                   |    7 +
 drivers/base/firmware_loader/firmware.h       |    5 +
 drivers/base/firmware_loader/main.c           |   59 +-
 drivers/misc/Kconfig                          |    1 +
 drivers/misc/Makefile                         |    1 +
 drivers/misc/bcm-vk/Kconfig                   |   29 +
 drivers/misc/bcm-vk/Makefile                  |   11 +
 drivers/misc/bcm-vk/bcm_vk.h                  |  408 +++++
 drivers/misc/bcm-vk/bcm_vk_dev.c              | 1312 +++++++++++++++
 drivers/misc/bcm-vk/bcm_vk_msg.c              | 1438 +++++++++++++++++
 drivers/misc/bcm-vk/bcm_vk_msg.h              |  201 +++
 drivers/misc/bcm-vk/bcm_vk_sg.c               |  271 ++++
 drivers/misc/bcm-vk/bcm_vk_sg.h               |   60 +
 drivers/misc/bcm-vk/bcm_vk_tty.c              |  352 ++++
 drivers/soc/qcom/mdt_loader.c                 |    7 +-
 fs/exec.c                                     |  101 +-
 include/linux/firmware.h                      |    8 +-
 include/linux/fs.h                            |   30 +
 include/uapi/linux/misc/bcm_vk.h              |   99 ++
 lib/test_firmware.c                           |  144 +-
 security/integrity/ima/ima_main.c             |   24 +-
 .../selftests/firmware/fw_filesystem.sh       |   80 +
 22 files changed, 4595 insertions(+), 53 deletions(-)
 create mode 100644 drivers/misc/bcm-vk/Kconfig
 create mode 100644 drivers/misc/bcm-vk/Makefile
 create mode 100644 drivers/misc/bcm-vk/bcm_vk.h
 create mode 100644 drivers/misc/bcm-vk/bcm_vk_dev.c
 create mode 100644 drivers/misc/bcm-vk/bcm_vk_msg.c
 create mode 100644 drivers/misc/bcm-vk/bcm_vk_msg.h
 create mode 100644 drivers/misc/bcm-vk/bcm_vk_sg.c
 create mode 100644 drivers/misc/bcm-vk/bcm_vk_sg.h
 create mode 100644 drivers/misc/bcm-vk/bcm_vk_tty.c
 create mode 100644 include/uapi/linux/misc/bcm_vk.h

-- 
2.17.1


^ permalink raw reply	[flat|nested] 13+ messages in thread
* [PATCH v6 1/8] fs: introduce kernel_pread_file* support
  2020-06-05 22:59 [PATCH v6 0/8] firmware: add partial read support in request_firmware_into_buf Scott Branden
@ 2020-06-05 22:59 ` Scott Branden
  2020-06-06  3:20   ` Matthew Wilcox
  2020-06-05 22:59 ` [PATCH v6 2/8] firmware: add offset to request_firmware_into_buf Scott Branden
                   ` (5 subsequent siblings)
  6 siblings, 1 reply; 13+ messages in thread
From: Scott Branden @ 2020-06-05 22:59 UTC (permalink / raw)
  To: Luis Chamberlain, Greg Kroah-Hartman, David Brown,
	Alexander Viro, Shuah Khan, bjorn.andersson, Shuah Khan,
	Arnd Bergmann
  Cc: Mimi Zohar, Rafael J . Wysocki, linux-kernel, linux-arm-msm,
	linux-fsdevel, BCM Kernel Feedback, Olof Johansson,
	Andrew Morton, Dan Carpenter, Colin Ian King, Kees Cook,
	Takashi Iwai, linux-kselftest, Andy Gross, linux-integrity,
	linux-security-module, Scott Branden

Add kernel_pread_file* support to kernel to allow for partial read
of files with an offset into the file.  Existing kernel_read_file
functions call new kernel_pread_file functions with offset=0 and
opt=KERNEL_PREAD_WHOLE.

Signed-off-by: Scott Branden <scott.branden@broadcom.com>
---
 fs/exec.c          | 95 ++++++++++++++++++++++++++++++++++++----------
 include/linux/fs.h | 29 ++++++++++++++
 2 files changed, 103 insertions(+), 21 deletions(-)

diff --git a/fs/exec.c b/fs/exec.c
index de90a66587ab..e5c241c07b75 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -925,10 +925,15 @@ struct file *open_exec(const char *name)
 }
 EXPORT_SYMBOL(open_exec);
 
-int kernel_read_file(struct file *file, void **buf, loff_t *size,
-		     loff_t max_size, enum kernel_read_file_id id)
-{
-	loff_t i_size, pos;
+int kernel_pread_file(struct file *file, void **buf, loff_t *size,
+		      loff_t pos, loff_t max_size,
+		      enum kernel_pread_opt opt,
+		      enum kernel_read_file_id id)
+{
+	loff_t alloc_size;
+	loff_t buf_pos;
+	loff_t read_end;
+	loff_t i_size;
 	ssize_t bytes = 0;
 	int ret;
 
@@ -948,21 +953,31 @@ int kernel_read_file(struct file *file, void **buf, loff_t *size,
 		ret = -EINVAL;
 		goto out;
 	}
-	if (i_size > SIZE_MAX || (max_size > 0 && i_size > max_size)) {
+
+	/* Default read to end of file */
+	read_end = i_size;
+
+	/* Allow reading partial portion of file */
+	if ((opt == KERNEL_PREAD_PART) &&
+	    (i_size > (pos + max_size)))
+		read_end = pos + max_size;
+
+	alloc_size = read_end - pos;
+	if (i_size > SIZE_MAX || (max_size > 0 && alloc_size > max_size)) {
 		ret = -EFBIG;
 		goto out;
 	}
 
 	if (id != READING_FIRMWARE_PREALLOC_BUFFER)
-		*buf = vmalloc(i_size);
+		*buf = vmalloc(alloc_size);
 	if (!*buf) {
 		ret = -ENOMEM;
 		goto out;
 	}
 
-	pos = 0;
-	while (pos < i_size) {
-		bytes = kernel_read(file, *buf + pos, i_size - pos, &pos);
+	buf_pos = 0;
+	while (pos < read_end) {
+		bytes = kernel_read(file, *buf + buf_pos, read_end - pos, &pos);
 		if (bytes < 0) {
 			ret = bytes;
 			goto out_free;
@@ -970,14 +985,16 @@ int kernel_read_file(struct file *file, void **buf, loff_t *size,
 
 		if (bytes == 0)
 			break;
+
+		buf_pos += bytes;
 	}
 
-	if (pos != i_size) {
+	if (pos != read_end) {
 		ret = -EIO;
 		goto out_free;
 	}
 
-	ret = security_kernel_post_read_file(file, *buf, i_size, id);
+	ret = security_kernel_post_read_file(file, *buf, alloc_size, id);
 	if (!ret)
 		*size = pos;
 
@@ -993,10 +1010,20 @@ int kernel_read_file(struct file *file, void **buf, loff_t *size,
 	allow_write_access(file);
 	return ret;
 }
+
+int kernel_read_file(struct file *file, void **buf, loff_t *size,
+		     loff_t max_size, enum kernel_read_file_id id)
+{
+	return kernel_pread_file(file, buf, size, 0, max_size,
+				 KERNEL_PREAD_WHOLE, id);
+}
 EXPORT_SYMBOL_GPL(kernel_read_file);
 
-int kernel_read_file_from_path(const char *path, void **buf, loff_t *size,
-			       loff_t max_size, enum kernel_read_file_id id)
+int kernel_pread_file_from_path(const char *path, void **buf,
+				loff_t *size, loff_t pos,
+				loff_t max_size,
+				enum kernel_pread_opt opt,
+				enum kernel_read_file_id id)
 {
 	struct file *file;
 	int ret;
@@ -1008,15 +1035,24 @@ int kernel_read_file_from_path(const char *path, void **buf, loff_t *size,
 	if (IS_ERR(file))
 		return PTR_ERR(file);
 
-	ret = kernel_read_file(file, buf, size, max_size, id);
+	ret = kernel_pread_file(file, buf, size, pos, max_size, opt, id);
 	fput(file);
 	return ret;
 }
+
+int kernel_read_file_from_path(const char *path, void **buf, loff_t *size,
+			       loff_t max_size, enum kernel_read_file_id id)
+{
+	return kernel_pread_file_from_path(path, buf, size, 0, max_size,
+					   KERNEL_PREAD_WHOLE, id);
+}
 EXPORT_SYMBOL_GPL(kernel_read_file_from_path);
 
-int kernel_read_file_from_path_initns(const char *path, void **buf,
-				      loff_t *size, loff_t max_size,
-				      enum kernel_read_file_id id)
+extern int kernel_pread_file_from_path_initns(const char *path, void **buf,
+					      loff_t *size, loff_t pos,
+					      loff_t max_size,
+					      enum kernel_pread_opt opt,
+					      enum kernel_read_file_id id)
 {
 	struct file *file;
 	struct path root;
@@ -1034,14 +1070,24 @@ int kernel_read_file_from_path_initns(const char *path, void **buf,
 	if (IS_ERR(file))
 		return PTR_ERR(file);
 
-	ret = kernel_read_file(file, buf, size, max_size, id);
+	ret = kernel_pread_file(file, buf, size, pos, max_size, opt, id);
 	fput(file);
 	return ret;
 }
+
+int kernel_read_file_from_path_initns(const char *path, void **buf,
+				      loff_t *size, loff_t max_size,
+				      enum kernel_read_file_id id)
+{
+	return kernel_pread_file_from_path_initns(path, buf, size, 0, max_size,
+						  KERNEL_PREAD_WHOLE, id);
+}
 EXPORT_SYMBOL_GPL(kernel_read_file_from_path_initns);
 
-int kernel_read_file_from_fd(int fd, void **buf, loff_t *size, loff_t max_size,
-			     enum kernel_read_file_id id)
+int kernel_pread_file_from_fd(int fd, void **buf, loff_t *size, loff_t pos,
+			      loff_t max_size,
+			      enum kernel_pread_opt opt,
+			      enum kernel_read_file_id id)
 {
 	struct fd f = fdget(fd);
 	int ret = -EBADF;
@@ -1049,11 +1095,18 @@ int kernel_read_file_from_fd(int fd, void **buf, loff_t *size, loff_t max_size,
 	if (!f.file)
 		goto out;
 
-	ret = kernel_read_file(f.file, buf, size, max_size, id);
+	ret = kernel_pread_file(f.file, buf, size, pos, max_size, opt, id);
 out:
 	fdput(f);
 	return ret;
 }
+
+int kernel_read_file_from_fd(int fd, void **buf, loff_t *size, loff_t max_size,
+			     enum kernel_read_file_id id)
+{
+	return kernel_pread_file_from_fd(fd, buf, size, 0, max_size,
+					 KERNEL_PREAD_WHOLE, id);
+}
 EXPORT_SYMBOL_GPL(kernel_read_file_from_fd);
 
 #if defined(CONFIG_HAVE_AOUT) || defined(CONFIG_BINFMT_FLAT) || \
diff --git a/include/linux/fs.h b/include/linux/fs.h
index fce4b8867224..76d463e4a628 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3048,12 +3048,41 @@ static inline const char *kernel_read_file_id_str(enum kernel_read_file_id id)
 	return kernel_read_file_str[id];
 }
 
+/**
+ * enum kernel_pread_opt - options to control pread file loading behaviour
+ *
+ * @KERNEL_PREAD_WHOLE: Only Allow reading of whole file.
+ * @KERNEL_PREAD_PART: Allow reading part of file.
+ */
+enum kernel_pread_opt {
+	KERNEL_PREAD_WHOLE = 0,
+	KERNEL_PREAD_PART = BIT(0),
+};
+
+int kernel_pread_file(struct file *file, void **buf, loff_t *size,
+		      loff_t pos, loff_t max_size,
+		      enum kernel_pread_opt opt,
+		      enum kernel_read_file_id id);
 extern int kernel_read_file(struct file *, void **, loff_t *, loff_t,
 			    enum kernel_read_file_id);
+int kernel_pread_file_from_path(const char *path, void **buf,
+				loff_t *size, loff_t pos,
+				loff_t max_size,
+				enum kernel_pread_opt opt,
+				enum kernel_read_file_id id);
 extern int kernel_read_file_from_path(const char *, void **, loff_t *, loff_t,
 				      enum kernel_read_file_id);
+int kernel_pread_file_from_path_initns(const char *path, void **buf,
+				       loff_t *size, loff_t pos,
+				       loff_t max_size,
+				       enum kernel_pread_opt opt,
+				       enum kernel_read_file_id id);
 extern int kernel_read_file_from_path_initns(const char *, void **, loff_t *, loff_t,
 					     enum kernel_read_file_id);
+int kernel_pread_file_from_fd(int fd, void **buf, loff_t *size,
+			      loff_t pos, loff_t max_size,
+			      enum kernel_pread_opt opt,
+			      enum kernel_read_file_id id);
 extern int kernel_read_file_from_fd(int, void **, loff_t *, loff_t,
 				    enum kernel_read_file_id);
 extern ssize_t kernel_read(struct file *, void *, size_t, loff_t *);
-- 
2.17.1


^ permalink raw reply related	[flat|nested] 13+ messages in thread
* [PATCH v6 2/8] firmware: add offset to request_firmware_into_buf
  2020-06-05 22:59 [PATCH v6 0/8] firmware: add partial read support in request_firmware_into_buf Scott Branden
  2020-06-05 22:59 ` [PATCH v6 1/8] fs: introduce kernel_pread_file* support Scott Branden
@ 2020-06-05 22:59 ` Scott Branden
  2020-06-05 22:59 ` [PATCH v6 3/8] test_firmware: add partial read support for request_firmware_into_buf Scott Branden
                   ` (4 subsequent siblings)
  6 siblings, 0 replies; 13+ messages in thread
From: Scott Branden @ 2020-06-05 22:59 UTC (permalink / raw)
  To: Luis Chamberlain, Greg Kroah-Hartman, David Brown,
	Alexander Viro, Shuah Khan, bjorn.andersson, Shuah Khan,
	Arnd Bergmann
  Cc: Mimi Zohar, Rafael J . Wysocki, linux-kernel, linux-arm-msm,
	linux-fsdevel, BCM Kernel Feedback, Olof Johansson,
	Andrew Morton, Dan Carpenter, Colin Ian King, Kees Cook,
	Takashi Iwai, linux-kselftest, Andy Gross, linux-integrity,
	linux-security-module, Scott Branden

Add offset to request_firmware_into_buf to allow for portions
of firmware file to be read into a buffer.  Necessary where firmware
needs to be loaded in portions from file in memory constrained systems.

Signed-off-by: Scott Branden <scott.branden@broadcom.com>
---
 drivers/base/firmware_loader/firmware.h |  5 +++
 drivers/base/firmware_loader/main.c     | 53 +++++++++++++++++--------
 drivers/soc/qcom/mdt_loader.c           |  7 +++-
 include/linux/firmware.h                |  8 +++-
 lib/test_firmware.c                     |  4 +-
 5 files changed, 56 insertions(+), 21 deletions(-)

diff --git a/drivers/base/firmware_loader/firmware.h b/drivers/base/firmware_loader/firmware.h
index 933e2192fbe8..c9b6ba8d29d8 100644
--- a/drivers/base/firmware_loader/firmware.h
+++ b/drivers/base/firmware_loader/firmware.h
@@ -32,6 +32,8 @@
  * @FW_OPT_FALLBACK_PLATFORM: Enable fallback to device fw copy embedded in
  *	the platform's main firmware. If both this fallback and the sysfs
  *      fallback are enabled, then this fallback will be tried first.
+ * @FW_OPT_PARTIAL: Allow partial read of firmware instead of needing to read
+ *	entire file.
  */
 enum fw_opt {
 	FW_OPT_UEVENT			= BIT(0),
@@ -41,6 +43,7 @@ enum fw_opt {
 	FW_OPT_NOCACHE			= BIT(4),
 	FW_OPT_NOFALLBACK_SYSFS		= BIT(5),
 	FW_OPT_FALLBACK_PLATFORM	= BIT(6),
+	FW_OPT_PARTIAL			= BIT(7),
 };
 
 enum fw_status {
@@ -68,6 +71,8 @@ struct fw_priv {
 	void *data;
 	size_t size;
 	size_t allocated_size;
+	size_t offset;
+	enum kernel_pread_opt opt;
 #ifdef CONFIG_FW_LOADER_PAGED_BUF
 	bool is_paged_buf;
 	struct page **pages;
diff --git a/drivers/base/firmware_loader/main.c b/drivers/base/firmware_loader/main.c
index ca871b13524e..93e7fee42cd4 100644
--- a/drivers/base/firmware_loader/main.c
+++ b/drivers/base/firmware_loader/main.c
@@ -167,7 +167,9 @@ static int fw_cache_piggyback_on_request(const char *name);
 
 static struct fw_priv *__allocate_fw_priv(const char *fw_name,
 					  struct firmware_cache *fwc,
-					  void *dbuf, size_t size)
+					  void *dbuf, size_t size,
+					  size_t offset,
+					  enum kernel_pread_opt opt)
 {
 	struct fw_priv *fw_priv;
 
@@ -185,6 +187,8 @@ static struct fw_priv *__allocate_fw_priv(const char *fw_name,
 	fw_priv->fwc = fwc;
 	fw_priv->data = dbuf;
 	fw_priv->allocated_size = size;
+	fw_priv->offset = offset;
+	fw_priv->opt = opt;
 	fw_state_init(fw_priv);
 #ifdef CONFIG_FW_LOADER_USER_HELPER
 	INIT_LIST_HEAD(&fw_priv->pending_list);
@@ -210,9 +214,11 @@ static struct fw_priv *__lookup_fw_priv(const char *fw_name)
 static int alloc_lookup_fw_priv(const char *fw_name,
 				struct firmware_cache *fwc,
 				struct fw_priv **fw_priv, void *dbuf,
-				size_t size, u32 opt_flags)
+				size_t size, u32 opt_flags,
+				size_t offset)
 {
 	struct fw_priv *tmp;
+	enum kernel_pread_opt pread_opt;
 
 	spin_lock(&fwc->lock);
 	if (!(opt_flags & FW_OPT_NOCACHE)) {
@@ -226,7 +232,12 @@ static int alloc_lookup_fw_priv(const char *fw_name,
 		}
 	}
 
-	tmp = __allocate_fw_priv(fw_name, fwc, dbuf, size);
+	if (opt_flags & FW_OPT_PARTIAL)
+		pread_opt = KERNEL_PREAD_PART;
+	else
+		pread_opt = KERNEL_PREAD_WHOLE;
+
+	tmp = __allocate_fw_priv(fw_name, fwc, dbuf, size, offset, pread_opt);
 	if (tmp) {
 		INIT_LIST_HEAD(&tmp->list);
 		if (!(opt_flags & FW_OPT_NOCACHE))
@@ -495,8 +506,10 @@ fw_get_filesystem_firmware(struct device *device, struct fw_priv *fw_priv,
 		fw_priv->size = 0;
 
 		/* load firmware files from the mount namespace of init */
-		rc = kernel_read_file_from_path_initns(path, &buffer,
-						       &size, msize, id);
+		rc = kernel_pread_file_from_path_initns(path, &buffer,
+							&size, fw_priv->offset,
+							msize,
+							fw_priv->opt, id);
 		if (rc) {
 			if (rc != -ENOENT)
 				dev_warn(device, "loading %s failed with error %d\n",
@@ -683,7 +696,7 @@ int assign_fw(struct firmware *fw, struct device *device, u32 opt_flags)
 static int
 _request_firmware_prepare(struct firmware **firmware_p, const char *name,
 			  struct device *device, void *dbuf, size_t size,
-			  u32 opt_flags)
+			  u32 opt_flags, size_t offset)
 {
 	struct firmware *firmware;
 	struct fw_priv *fw_priv;
@@ -702,7 +715,7 @@ _request_firmware_prepare(struct firmware **firmware_p, const char *name,
 	}
 
 	ret = alloc_lookup_fw_priv(name, &fw_cache, &fw_priv, dbuf, size,
-				  opt_flags);
+				   opt_flags, offset);
 
 	/*
 	 * bind with 'priv' now to avoid warning in failure path
@@ -749,7 +762,7 @@ static void fw_abort_batch_reqs(struct firmware *fw)
 static int
 _request_firmware(const struct firmware **firmware_p, const char *name,
 		  struct device *device, void *buf, size_t size,
-		  u32 opt_flags)
+		  u32 opt_flags, size_t offset)
 {
 	struct firmware *fw = NULL;
 	int ret;
@@ -763,7 +776,7 @@ _request_firmware(const struct firmware **firmware_p, const char *name,
 	}
 
 	ret = _request_firmware_prepare(&fw, name, device, buf, size,
-					opt_flags);
+					opt_flags, offset);
 	if (ret <= 0) /* error or already assigned */
 		goto out;
 
@@ -826,7 +839,7 @@ request_firmware(const struct firmware **firmware_p, const char *name,
 	/* Need to pin this module until return */
 	__module_get(THIS_MODULE);
 	ret = _request_firmware(firmware_p, name, device, NULL, 0,
-				FW_OPT_UEVENT);
+				FW_OPT_UEVENT, 0);
 	module_put(THIS_MODULE);
 	return ret;
 }
@@ -853,7 +866,7 @@ int firmware_request_nowarn(const struct firmware **firmware, const char *name,
 	/* Need to pin this module until return */
 	__module_get(THIS_MODULE);
 	ret = _request_firmware(firmware, name, device, NULL, 0,
-				FW_OPT_UEVENT | FW_OPT_NO_WARN);
+				FW_OPT_UEVENT | FW_OPT_NO_WARN, 0);
 	module_put(THIS_MODULE);
 	return ret;
 }
@@ -878,7 +891,7 @@ int request_firmware_direct(const struct firmware **firmware_p,
 	__module_get(THIS_MODULE);
 	ret = _request_firmware(firmware_p, name, device, NULL, 0,
 				FW_OPT_UEVENT | FW_OPT_NO_WARN |
-				FW_OPT_NOFALLBACK_SYSFS);
+				FW_OPT_NOFALLBACK_SYSFS, 0);
 	module_put(THIS_MODULE);
 	return ret;
 }
@@ -902,7 +915,7 @@ int firmware_request_platform(const struct firmware **firmware,
 	/* Need to pin this module until return */
 	__module_get(THIS_MODULE);
 	ret = _request_firmware(firmware, name, device, NULL, 0,
-				FW_OPT_UEVENT | FW_OPT_FALLBACK_PLATFORM);
+				FW_OPT_UEVENT | FW_OPT_FALLBACK_PLATFORM, 0);
 	module_put(THIS_MODULE);
 	return ret;
 }
@@ -939,6 +952,8 @@ EXPORT_SYMBOL_GPL(firmware_request_cache);
  * @device: device for which firmware is being loaded and DMA region allocated
  * @buf: address of buffer to load firmware into
  * @size: size of buffer
+ * @offset: offset into file to read
+ * @pread_opt: KERNEL_PREAD_PART to allow partial file read
  *
  * This function works pretty much like request_firmware(), but it doesn't
  * allocate a buffer to hold the firmware data. Instead, the firmware
@@ -949,16 +964,22 @@ EXPORT_SYMBOL_GPL(firmware_request_cache);
  */
 int
 request_firmware_into_buf(const struct firmware **firmware_p, const char *name,
-			  struct device *device, void *buf, size_t size)
+			  struct device *device, void *buf, size_t size,
+			  size_t offset, enum kernel_pread_opt pread_opt)
 {
 	int ret;
+	u32 opt_flags;
 
 	if (fw_cache_is_setup(device, name))
 		return -EOPNOTSUPP;
 
 	__module_get(THIS_MODULE);
+	opt_flags = FW_OPT_UEVENT | FW_OPT_NOCACHE;
+	if (pread_opt == KERNEL_PREAD_PART)
+		opt_flags |= FW_OPT_PARTIAL;
+
 	ret = _request_firmware(firmware_p, name, device, buf, size,
-				FW_OPT_UEVENT | FW_OPT_NOCACHE);
+				opt_flags, offset);
 	module_put(THIS_MODULE);
 	return ret;
 }
@@ -997,7 +1018,7 @@ static void request_firmware_work_func(struct work_struct *work)
 	fw_work = container_of(work, struct firmware_work, work);
 
 	_request_firmware(&fw, fw_work->name, fw_work->device, NULL, 0,
-			  fw_work->opt_flags);
+			  fw_work->opt_flags, 0);
 	fw_work->cont(fw, fw_work->context);
 	put_device(fw_work->device); /* taken in request_firmware_nowait() */
 
diff --git a/drivers/soc/qcom/mdt_loader.c b/drivers/soc/qcom/mdt_loader.c
index 24cd193dec55..c9490c15da68 100644
--- a/drivers/soc/qcom/mdt_loader.c
+++ b/drivers/soc/qcom/mdt_loader.c
@@ -246,8 +246,11 @@ static int __qcom_mdt_load(struct device *dev, const struct firmware *fw,
 		} else if (phdr->p_filesz) {
 			/* Firmware not large enough, load split-out segments */
 			sprintf(fw_name + fw_name_len - 3, "b%02d", i);
-			ret = request_firmware_into_buf(&seg_fw, fw_name, dev,
-							ptr, phdr->p_filesz);
+			ret = request_firmware_into_buf
+						(&seg_fw, fw_name, dev,
+						 ptr, phdr->p_filesz,
+						 0,
+						 KERNEL_PREAD_WHOLE);
 			if (ret) {
 				dev_err(dev, "failed to load %s\n", fw_name);
 				break;
diff --git a/include/linux/firmware.h b/include/linux/firmware.h
index cb3e2c06ed8a..a53a854294e2 100644
--- a/include/linux/firmware.h
+++ b/include/linux/firmware.h
@@ -4,6 +4,7 @@
 
 #include <linux/types.h>
 #include <linux/compiler.h>
+#include <linux/fs.h>
 #include <linux/gfp.h>
 
 #define FW_ACTION_NOHOTPLUG 0
@@ -52,7 +53,9 @@ int request_firmware_nowait(
 int request_firmware_direct(const struct firmware **fw, const char *name,
 			    struct device *device);
 int request_firmware_into_buf(const struct firmware **firmware_p,
-	const char *name, struct device *device, void *buf, size_t size);
+			      const char *name, struct device *device,
+			      void *buf, size_t size,
+			      size_t offset, enum kernel_pread_opt opt);
 
 void release_firmware(const struct firmware *fw);
 #else
@@ -97,7 +100,8 @@ static inline int request_firmware_direct(const struct firmware **fw,
 }
 
 static inline int request_firmware_into_buf(const struct firmware **firmware_p,
-	const char *name, struct device *device, void *buf, size_t size)
+	const char *name, struct device *device, void *buf, size_t size,
+	size_t offset, enum kernel_pread_opt opt)
 {
 	return -EINVAL;
 }
diff --git a/lib/test_firmware.c b/lib/test_firmware.c
index 9fee2b93a8d1..af747660fe29 100644
--- a/lib/test_firmware.c
+++ b/lib/test_firmware.c
@@ -654,7 +654,9 @@ static int test_fw_run_batch_request(void *data)
 						    req->name,
 						    req->dev,
 						    test_buf,
-						    TEST_FIRMWARE_BUF_SIZE);
+						    TEST_FIRMWARE_BUF_SIZE,
+						    0,
+						    KERNEL_PREAD_WHOLE);
 		if (!req->fw)
 			kfree(test_buf);
 	} else {
-- 
2.17.1


^ permalink raw reply related	[flat|nested] 13+ messages in thread
* [PATCH v6 3/8] test_firmware: add partial read support for request_firmware_into_buf
  2020-06-05 22:59 [PATCH v6 0/8] firmware: add partial read support in request_firmware_into_buf Scott Branden
  2020-06-05 22:59 ` [PATCH v6 1/8] fs: introduce kernel_pread_file* support Scott Branden
  2020-06-05 22:59 ` [PATCH v6 2/8] firmware: add offset to request_firmware_into_buf Scott Branden
@ 2020-06-05 22:59 ` Scott Branden
  2020-06-05 22:59 ` [PATCH v6 4/8] firmware: test partial file reads of request_firmware_into_buf Scott Branden
                   ` (3 subsequent siblings)
  6 siblings, 0 replies; 13+ messages in thread
From: Scott Branden @ 2020-06-05 22:59 UTC (permalink / raw)
  To: Luis Chamberlain, Greg Kroah-Hartman, David Brown,
	Alexander Viro, Shuah Khan, bjorn.andersson, Shuah Khan,
	Arnd Bergmann
  Cc: Mimi Zohar, Rafael J . Wysocki, linux-kernel, linux-arm-msm,
	linux-fsdevel, BCM Kernel Feedback, Olof Johansson,
	Andrew Morton, Dan Carpenter, Colin Ian King, Kees Cook,
	Takashi Iwai, linux-kselftest, Andy Gross, linux-integrity,
	linux-security-module, Scott Branden

Add additional hooks to test_firmware to pass in support
for partial file read using request_firmware_into_buf.
buf_size: size of buffer to request firmware into
partial: indicates that a partial file request is being made
file_offset: to indicate offset into file to request

Signed-off-by: Scott Branden <scott.branden@broadcom.com>
---
 lib/test_firmware.c | 146 +++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 136 insertions(+), 10 deletions(-)

diff --git a/lib/test_firmware.c b/lib/test_firmware.c
index af747660fe29..1a79611cae78 100644
--- a/lib/test_firmware.c
+++ b/lib/test_firmware.c
@@ -50,6 +50,9 @@ struct test_batched_req {
  * @name: the name of the firmware file to look for
  * @into_buf: when the into_buf is used if this is true
  *	request_firmware_into_buf() will be used instead.
+ * @buf_size: size of buf to allocate when into_buf is true
+ * @file_offset: file offset to request when calling request_firmware_into_buf
+ * @partial: partial read opt when calling request_firmware_into_buf
  * @sync_direct: when the sync trigger is used if this is true
  *	request_firmware_direct() will be used instead.
  * @send_uevent: whether or not to send a uevent for async requests
@@ -89,6 +92,9 @@ struct test_batched_req {
 struct test_config {
 	char *name;
 	bool into_buf;
+	size_t buf_size;
+	size_t file_offset;
+	bool partial;
 	bool sync_direct;
 	bool send_uevent;
 	u8 num_requests;
@@ -183,6 +189,9 @@ static int __test_firmware_config_init(void)
 	test_fw_config->num_requests = TEST_FIRMWARE_NUM_REQS;
 	test_fw_config->send_uevent = true;
 	test_fw_config->into_buf = false;
+	test_fw_config->buf_size = TEST_FIRMWARE_BUF_SIZE;
+	test_fw_config->file_offset = 0;
+	test_fw_config->partial = false;
 	test_fw_config->sync_direct = false;
 	test_fw_config->req_firmware = request_firmware;
 	test_fw_config->test_result = 0;
@@ -236,28 +245,35 @@ static ssize_t config_show(struct device *dev,
 			dev_name(dev));
 
 	if (test_fw_config->name)
-		len += scnprintf(buf+len, PAGE_SIZE - len,
+		len += scnprintf(buf + len, PAGE_SIZE - len,
 				"name:\t%s\n",
 				test_fw_config->name);
 	else
-		len += scnprintf(buf+len, PAGE_SIZE - len,
+		len += scnprintf(buf + len, PAGE_SIZE - len,
 				"name:\tEMTPY\n");
 
-	len += scnprintf(buf+len, PAGE_SIZE - len,
+	len += scnprintf(buf + len, PAGE_SIZE - len,
 			"num_requests:\t%u\n", test_fw_config->num_requests);
 
-	len += scnprintf(buf+len, PAGE_SIZE - len,
+	len += scnprintf(buf + len, PAGE_SIZE - len,
 			"send_uevent:\t\t%s\n",
 			test_fw_config->send_uevent ?
 			"FW_ACTION_HOTPLUG" :
 			"FW_ACTION_NOHOTPLUG");
-	len += scnprintf(buf+len, PAGE_SIZE - len,
+	len += scnprintf(buf + len, PAGE_SIZE - len,
 			"into_buf:\t\t%s\n",
 			test_fw_config->into_buf ? "true" : "false");
-	len += scnprintf(buf+len, PAGE_SIZE - len,
+	len += scnprintf(buf + len, PAGE_SIZE - len,
+			"buf_size:\t%zu\n", test_fw_config->buf_size);
+	len += scnprintf(buf + len, PAGE_SIZE - len,
+			"file_offset:\t%zu\n", test_fw_config->file_offset);
+	len += scnprintf(buf + len, PAGE_SIZE - len,
+			"partial:\t\t%s\n",
+			test_fw_config->partial ? "true" : "false");
+	len += scnprintf(buf + len, PAGE_SIZE - len,
 			"sync_direct:\t\t%s\n",
 			test_fw_config->sync_direct ? "true" : "false");
-	len += scnprintf(buf+len, PAGE_SIZE - len,
+	len += scnprintf(buf + len, PAGE_SIZE - len,
 			"read_fw_idx:\t%u\n", test_fw_config->read_fw_idx);
 
 	mutex_unlock(&test_fw_mutex);
@@ -315,6 +331,30 @@ static ssize_t test_dev_config_show_bool(char *buf, bool val)
 	return snprintf(buf, PAGE_SIZE, "%d\n", val);
 }
 
+static int test_dev_config_update_size_t(const char *buf,
+					 size_t size,
+					 size_t *cfg)
+{
+	int ret;
+	long new;
+
+	ret = kstrtol(buf, 10, &new);
+	if (ret)
+		return ret;
+
+	mutex_lock(&test_fw_mutex);
+	*(size_t *)cfg = new;
+	mutex_unlock(&test_fw_mutex);
+
+	/* Always return full write size even if we didn't consume all */
+	return size;
+}
+
+static ssize_t test_dev_config_show_size_t(char *buf, size_t val)
+{
+	return snprintf(buf, PAGE_SIZE, "%zu\n", val);
+}
+
 static ssize_t test_dev_config_show_int(char *buf, int val)
 {
 	return snprintf(buf, PAGE_SIZE, "%d\n", val);
@@ -400,6 +440,83 @@ static ssize_t config_into_buf_show(struct device *dev,
 }
 static DEVICE_ATTR_RW(config_into_buf);
 
+static ssize_t config_buf_size_store(struct device *dev,
+				     struct device_attribute *attr,
+				     const char *buf, size_t count)
+{
+	int rc;
+
+	mutex_lock(&test_fw_mutex);
+	if (test_fw_config->reqs) {
+		pr_err("Must call release_all_firmware prior to changing config\n");
+		rc = -EINVAL;
+		mutex_unlock(&test_fw_mutex);
+		goto out;
+	}
+	mutex_unlock(&test_fw_mutex);
+
+	rc = test_dev_config_update_size_t(buf, count,
+					   &test_fw_config->buf_size);
+
+out:
+	return rc;
+}
+
+static ssize_t config_buf_size_show(struct device *dev,
+				    struct device_attribute *attr,
+				    char *buf)
+{
+	return test_dev_config_show_size_t(buf, test_fw_config->buf_size);
+}
+static DEVICE_ATTR_RW(config_buf_size);
+
+static ssize_t config_file_offset_store(struct device *dev,
+					struct device_attribute *attr,
+					const char *buf, size_t count)
+{
+	int rc;
+
+	mutex_lock(&test_fw_mutex);
+	if (test_fw_config->reqs) {
+		pr_err("Must call release_all_firmware prior to changing config\n");
+		rc = -EINVAL;
+		mutex_unlock(&test_fw_mutex);
+		goto out;
+	}
+	mutex_unlock(&test_fw_mutex);
+
+	rc = test_dev_config_update_size_t(buf, count,
+					   &test_fw_config->file_offset);
+
+out:
+	return rc;
+}
+
+static ssize_t config_file_offset_show(struct device *dev,
+				       struct device_attribute *attr,
+				       char *buf)
+{
+	return test_dev_config_show_size_t(buf, test_fw_config->file_offset);
+}
+static DEVICE_ATTR_RW(config_file_offset);
+
+static ssize_t config_partial_store(struct device *dev,
+				    struct device_attribute *attr,
+				    const char *buf, size_t count)
+{
+	return test_dev_config_update_bool(buf,
+					   count,
+					   &test_fw_config->partial);
+}
+
+static ssize_t config_partial_show(struct device *dev,
+				   struct device_attribute *attr,
+				   char *buf)
+{
+	return test_dev_config_show_bool(buf, test_fw_config->partial);
+}
+static DEVICE_ATTR_RW(config_partial);
+
 static ssize_t config_sync_direct_store(struct device *dev,
 					struct device_attribute *attr,
 					const char *buf, size_t count)
@@ -645,18 +762,24 @@ static int test_fw_run_batch_request(void *data)
 
 	if (test_fw_config->into_buf) {
 		void *test_buf;
+		enum kernel_pread_opt pread_opt;
 
 		test_buf = kzalloc(TEST_FIRMWARE_BUF_SIZE, GFP_KERNEL);
 		if (!test_buf)
 			return -ENOSPC;
 
+		if (test_fw_config->partial)
+			pread_opt = KERNEL_PREAD_PART;
+		else
+			pread_opt = KERNEL_PREAD_WHOLE;
+
 		req->rc = request_firmware_into_buf(&req->fw,
 						    req->name,
 						    req->dev,
 						    test_buf,
-						    TEST_FIRMWARE_BUF_SIZE,
-						    0,
-						    KERNEL_PREAD_WHOLE);
+						    test_fw_config->buf_size,
+						    test_fw_config->file_offset,
+						    pread_opt);
 		if (!req->fw)
 			kfree(test_buf);
 	} else {
@@ -929,6 +1052,9 @@ static struct attribute *test_dev_attrs[] = {
 	TEST_FW_DEV_ATTR(config_name),
 	TEST_FW_DEV_ATTR(config_num_requests),
 	TEST_FW_DEV_ATTR(config_into_buf),
+	TEST_FW_DEV_ATTR(config_buf_size),
+	TEST_FW_DEV_ATTR(config_file_offset),
+	TEST_FW_DEV_ATTR(config_partial),
 	TEST_FW_DEV_ATTR(config_sync_direct),
 	TEST_FW_DEV_ATTR(config_send_uevent),
 	TEST_FW_DEV_ATTR(config_read_fw_idx),
-- 
2.17.1


^ permalink raw reply related	[flat|nested] 13+ messages in thread
* [PATCH v6 4/8] firmware: test partial file reads of request_firmware_into_buf
  2020-06-05 22:59 [PATCH v6 0/8] firmware: add partial read support in request_firmware_into_buf Scott Branden
                   ` (2 preceding siblings ...)
  2020-06-05 22:59 ` [PATCH v6 3/8] test_firmware: add partial read support for request_firmware_into_buf Scott Branden
@ 2020-06-05 22:59 ` Scott Branden
  2020-06-05 22:59 ` [PATCH v6 5/8] bcm-vk: add bcm_vk UAPI Scott Branden
                   ` (2 subsequent siblings)
  6 siblings, 0 replies; 13+ messages in thread
From: Scott Branden @ 2020-06-05 22:59 UTC (permalink / raw)
  To: Luis Chamberlain, Greg Kroah-Hartman, David Brown,
	Alexander Viro, Shuah Khan, bjorn.andersson, Shuah Khan,
	Arnd Bergmann
  Cc: Mimi Zohar, Rafael J . Wysocki, linux-kernel, linux-arm-msm,
	linux-fsdevel, BCM Kernel Feedback, Olof Johansson,
	Andrew Morton, Dan Carpenter, Colin Ian King, Kees Cook,
	Takashi Iwai, linux-kselftest, Andy Gross, linux-integrity,
	linux-security-module, Scott Branden

Add firmware tests for partial file reads of request_firmware_into_buf.

Signed-off-by: Scott Branden <scott.branden@broadcom.com>
---
 .../selftests/firmware/fw_filesystem.sh       | 80 +++++++++++++++++++
 1 file changed, 80 insertions(+)

diff --git a/tools/testing/selftests/firmware/fw_filesystem.sh b/tools/testing/selftests/firmware/fw_filesystem.sh
index fcc281373b4d..38e89ba1b4d3 100755
--- a/tools/testing/selftests/firmware/fw_filesystem.sh
+++ b/tools/testing/selftests/firmware/fw_filesystem.sh
@@ -149,6 +149,26 @@ config_unset_into_buf()
 	echo 0 >  $DIR/config_into_buf
 }
 
+config_set_buf_size()
+{
+	echo $1 >  $DIR/config_buf_size
+}
+
+config_set_file_offset()
+{
+	echo $1 >  $DIR/config_file_offset
+}
+
+config_set_partial()
+{
+	echo 1 >  $DIR/config_partial
+}
+
+config_unset_partial()
+{
+	echo 0 >  $DIR/config_partial
+}
+
 config_set_sync_direct()
 {
 	echo 1 >  $DIR/config_sync_direct
@@ -207,6 +227,35 @@ read_firmwares()
 	done
 }
 
+read_firmwares_partial()
+{
+	if [ "$(cat $DIR/config_into_buf)" == "1" ]; then
+		fwfile="${FW_INTO_BUF}"
+	else
+		fwfile="${FW}"
+	fi
+
+	if [ "$1" = "xzonly" ]; then
+		fwfile="${fwfile}-orig"
+	fi
+
+	# Strip fwfile down to match partial offset and length
+	partial_data="$(cat $fwfile)"
+	partial_data="${partial_data:$2:$3}"
+
+	for i in $(seq 0 3); do
+		config_set_read_fw_idx $i
+
+		read_firmware="$(cat $DIR/read_firmware)"
+
+		# Verify the contents are what we expect.
+		if [ $read_firmware != $partial_data ]; then
+			echo "request #$i: partial firmware was not loaded" >&2
+			exit 1
+		fi
+	done
+}
+
 read_firmwares_expect_nofile()
 {
 	for i in $(seq 0 3); do
@@ -319,6 +368,21 @@ test_batched_request_firmware_into_buf()
 	echo "OK"
 }
 
+test_batched_request_firmware_into_buf_partial()
+{
+	echo -n "Batched request_firmware_into_buf_partial() $2 off=$3 size=$4 try #$1: "
+	config_reset
+	config_set_name $TEST_FIRMWARE_INTO_BUF_FILENAME
+	config_set_into_buf
+	config_set_partial
+	config_set_buf_size $4
+	config_set_file_offset $3
+	config_trigger_sync
+	read_firmwares_partial $2 $3 $4
+	release_all_firmware
+	echo "OK"
+}
+
 test_batched_request_firmware_direct()
 {
 	echo -n "Batched request_firmware_direct() $2 try #$1: "
@@ -371,6 +435,22 @@ for i in $(seq 1 5); do
 	test_batched_request_firmware_into_buf $i normal
 done
 
+for i in $(seq 1 5); do
+	test_batched_request_firmware_into_buf_partial $i normal 0 10
+done
+
+for i in $(seq 1 5); do
+	test_batched_request_firmware_into_buf_partial $i normal 0 5
+done
+
+for i in $(seq 1 5); do
+	test_batched_request_firmware_into_buf_partial $i normal 1 6
+done
+
+for i in $(seq 1 5); do
+	test_batched_request_firmware_into_buf_partial $i normal 2 10
+done
+
 for i in $(seq 1 5); do
 	test_batched_request_firmware_direct $i normal
 done
-- 
2.17.1


^ permalink raw reply related	[flat|nested] 13+ messages in thread
* [PATCH v6 5/8] bcm-vk: add bcm_vk UAPI
  2020-06-05 22:59 [PATCH v6 0/8] firmware: add partial read support in request_firmware_into_buf Scott Branden
                   ` (3 preceding siblings ...)
  2020-06-05 22:59 ` [PATCH v6 4/8] firmware: test partial file reads of request_firmware_into_buf Scott Branden
@ 2020-06-05 22:59 ` Scott Branden
  2020-06-05 22:59 ` [PATCH v6 7/8] MAINTAINERS: bcm-vk: add maintainer for Broadcom VK Driver Scott Branden
  2020-06-05 22:59 ` [PATCH v6 8/8] ima: add FIRMWARE_PARTIAL_READ support Scott Branden
  6 siblings, 0 replies; 13+ messages in thread
From: Scott Branden @ 2020-06-05 22:59 UTC (permalink / raw)
  To: Luis Chamberlain, Greg Kroah-Hartman, David Brown,
	Alexander Viro, Shuah Khan, bjorn.andersson, Shuah Khan,
	Arnd Bergmann
  Cc: Mimi Zohar, Rafael J . Wysocki, linux-kernel, linux-arm-msm,
	linux-fsdevel, BCM Kernel Feedback, Olof Johansson,
	Andrew Morton, Dan Carpenter, Colin Ian King, Kees Cook,
	Takashi Iwai, linux-kselftest, Andy Gross, linux-integrity,
	linux-security-module, Scott Branden

Add user space api for bcm-vk driver.

Signed-off-by: Scott Branden <scott.branden@broadcom.com>
---
 include/uapi/linux/misc/bcm_vk.h | 99 ++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 include/uapi/linux/misc/bcm_vk.h

diff --git a/include/uapi/linux/misc/bcm_vk.h b/include/uapi/linux/misc/bcm_vk.h
new file mode 100644
index 000000000000..783087b7c31f
--- /dev/null
+++ b/include/uapi/linux/misc/bcm_vk.h
@@ -0,0 +1,99 @@
+/* SPDX-License-Identifier: ((GPL-2.0 WITH Linux-syscall-note) OR BSD-2-Clause) */
+/*
+ * Copyright 2018-2020 Broadcom.
+ */
+
+#ifndef __UAPI_LINUX_MISC_BCM_VK_H
+#define __UAPI_LINUX_MISC_BCM_VK_H
+
+#include <linux/ioctl.h>
+#include <linux/types.h>
+
+#define BCM_VK_MAX_FILENAME 64
+
+struct vk_image {
+	__u32 type; /* Type of image */
+#define VK_IMAGE_TYPE_BOOT1 1 /* 1st stage (load to SRAM) */
+#define VK_IMAGE_TYPE_BOOT2 2 /* 2nd stage (load to DDR) */
+	char filename[BCM_VK_MAX_FILENAME]; /* Filename of image */
+};
+
+struct vk_reset {
+	__u32 arg1;
+	__u32 arg2;
+};
+
+#define VK_MAGIC		0x5e
+
+/* Load image to Valkyrie */
+#define VK_IOCTL_LOAD_IMAGE	_IOW(VK_MAGIC, 0x2, struct vk_image)
+
+/* Send Reset to Valkyrie */
+#define VK_IOCTL_RESET		_IOW(VK_MAGIC, 0x4, struct vk_reset)
+
+/*
+ * message block - basic unit in the message where a message's size is always
+ *		   N x sizeof(basic_block)
+ */
+struct vk_msg_blk {
+	__u8 function_id;
+#define VK_FID_TRANS_BUF	5
+#define VK_FID_SHUTDOWN		8
+	__u8 size;
+	__u16 trans_id; /* transport id, queue & msg_id */
+	__u32 context_id;
+	__u32 args[2];
+#define VK_CMD_PLANES_MASK	0x000f /* number of planes to up/download */
+#define VK_CMD_UPLOAD		0x0400 /* memory transfer to vk */
+#define VK_CMD_DOWNLOAD		0x0500 /* memory transfer from vk */
+#define VK_CMD_MASK		0x0f00 /* command mask */
+};
+
+#define VK_BAR_FWSTS			0x41c
+#define VK_BAR_COP_FWSTS		0x428
+/* VK_FWSTS definitions */
+#define VK_FWSTS_RELOCATION_ENTRY	BIT(0)
+#define VK_FWSTS_RELOCATION_EXIT	BIT(1)
+#define VK_FWSTS_INIT_START		BIT(2)
+#define VK_FWSTS_ARCH_INIT_DONE		BIT(3)
+#define VK_FWSTS_PRE_KNL1_INIT_DONE	BIT(4)
+#define VK_FWSTS_PRE_KNL2_INIT_DONE	BIT(5)
+#define VK_FWSTS_POST_KNL_INIT_DONE	BIT(6)
+#define VK_FWSTS_INIT_DONE		BIT(7)
+#define VK_FWSTS_APP_INIT_START		BIT(8)
+#define VK_FWSTS_APP_INIT_DONE		BIT(9)
+#define VK_FWSTS_MASK			0xffffffff
+#define VK_FWSTS_READY			(VK_FWSTS_INIT_START | \
+					 VK_FWSTS_ARCH_INIT_DONE | \
+					 VK_FWSTS_PRE_KNL1_INIT_DONE | \
+					 VK_FWSTS_PRE_KNL2_INIT_DONE | \
+					 VK_FWSTS_POST_KNL_INIT_DONE | \
+					 VK_FWSTS_INIT_DONE | \
+					 VK_FWSTS_APP_INIT_START | \
+					 VK_FWSTS_APP_INIT_DONE)
+/* Deinit */
+#define VK_FWSTS_APP_DEINIT_START	BIT(23)
+#define VK_FWSTS_APP_DEINIT_DONE	BIT(24)
+#define VK_FWSTS_DRV_DEINIT_START	BIT(25)
+#define VK_FWSTS_DRV_DEINIT_DONE	BIT(26)
+#define VK_FWSTS_RESET_DONE		BIT(27)
+#define VK_FWSTS_DEINIT_TRIGGERED	(VK_FWSTS_APP_DEINIT_START | \
+					 VK_FWSTS_APP_DEINIT_DONE  | \
+					 VK_FWSTS_DRV_DEINIT_START | \
+					 VK_FWSTS_DRV_DEINIT_DONE)
+/* Last nibble for reboot reason */
+#define VK_FWSTS_RESET_REASON_SHIFT	28
+#define VK_FWSTS_RESET_REASON_MASK	(0xf << VK_FWSTS_RESET_REASON_SHIFT)
+#define VK_FWSTS_RESET_SYS_PWRUP	(0x0 << VK_FWSTS_RESET_REASON_SHIFT)
+#define VK_FWSTS_RESET_MBOX_DB		(0x1 << VK_FWSTS_RESET_REASON_SHIFT)
+#define VK_FWSTS_RESET_M7_WDOG		(0x2 << VK_FWSTS_RESET_REASON_SHIFT)
+#define VK_FWSTS_RESET_TEMP		(0x3 << VK_FWSTS_RESET_REASON_SHIFT)
+#define VK_FWSTS_RESET_PCI_FLR		(0x4 << VK_FWSTS_RESET_REASON_SHIFT)
+#define VK_FWSTS_RESET_PCI_HOT		(0x5 << VK_FWSTS_RESET_REASON_SHIFT)
+#define VK_FWSTS_RESET_PCI_WARM		(0x6 << VK_FWSTS_RESET_REASON_SHIFT)
+#define VK_FWSTS_RESET_PCI_COLD		(0x7 << VK_FWSTS_RESET_REASON_SHIFT)
+#define VK_FWSTS_RESET_L1		(0x8 << VK_FWSTS_RESET_REASON_SHIFT)
+#define VK_FWSTS_RESET_L0		(0x9 << VK_FWSTS_RESET_REASON_SHIFT)
+#define VK_FWSTS_RESET_UNKNOWN		(0xf << VK_FWSTS_RESET_REASON_SHIFT)
+
+#endif /* __UAPI_LINUX_MISC_BCM_VK_H */
-- 
2.17.1


^ permalink raw reply related	[flat|nested] 13+ messages in thread
* [PATCH v6 7/8] MAINTAINERS: bcm-vk: add maintainer for Broadcom VK Driver
  2020-06-05 22:59 [PATCH v6 0/8] firmware: add partial read support in request_firmware_into_buf Scott Branden
                   ` (4 preceding siblings ...)
  2020-06-05 22:59 ` [PATCH v6 5/8] bcm-vk: add bcm_vk UAPI Scott Branden
@ 2020-06-05 22:59 ` Scott Branden
  2020-06-05 22:59 ` [PATCH v6 8/8] ima: add FIRMWARE_PARTIAL_READ support Scott Branden
  6 siblings, 0 replies; 13+ messages in thread
From: Scott Branden @ 2020-06-05 22:59 UTC (permalink / raw)
  To: Luis Chamberlain, Greg Kroah-Hartman, David Brown,
	Alexander Viro, Shuah Khan, bjorn.andersson, Shuah Khan,
	Arnd Bergmann
  Cc: Mimi Zohar, Rafael J . Wysocki, linux-kernel, linux-arm-msm,
	linux-fsdevel, BCM Kernel Feedback, Olof Johansson,
	Andrew Morton, Dan Carpenter, Colin Ian King, Kees Cook,
	Takashi Iwai, linux-kselftest, Andy Gross, linux-integrity,
	linux-security-module, Scott Branden

Add maintainer entry for new Broadcom VK Driver

Signed-off-by: Scott Branden <scott.branden@broadcom.com>
---
 MAINTAINERS | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index b045b70e54df..9fbf255fe093 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3656,6 +3656,13 @@ L:	netdev@vger.kernel.org
 S:	Supported
 F:	drivers/net/ethernet/broadcom/tg3.*
 
+BROADCOM VK DRIVER
+M:	Scott Branden <scott.branden@broadcom.com>
+L:	bcm-kernel-feedback-list@broadcom.com
+S:	Supported
+F:	drivers/misc/bcm-vk/
+F:	include/uapi/linux/misc/bcm_vk.h
+
 BROCADE BFA FC SCSI DRIVER
 M:	Anil Gurumurthy <anil.gurumurthy@qlogic.com>
 M:	Sudarsana Kalluru <sudarsana.kalluru@qlogic.com>
-- 
2.17.1


^ permalink raw reply related	[flat|nested] 13+ messages in thread
* [PATCH v6 8/8] ima: add FIRMWARE_PARTIAL_READ support
  2020-06-05 22:59 [PATCH v6 0/8] firmware: add partial read support in request_firmware_into_buf Scott Branden
                   ` (5 preceding siblings ...)
  2020-06-05 22:59 ` [PATCH v6 7/8] MAINTAINERS: bcm-vk: add maintainer for Broadcom VK Driver Scott Branden
@ 2020-06-05 22:59 ` Scott Branden
  2020-06-05 23:19   ` Mimi Zohar
  6 siblings, 1 reply; 13+ messages in thread
From: Scott Branden @ 2020-06-05 22:59 UTC (permalink / raw)
  To: Luis Chamberlain, Greg Kroah-Hartman, David Brown,
	Alexander Viro, Shuah Khan, bjorn.andersson, Shuah Khan,
	Arnd Bergmann
  Cc: Mimi Zohar, Rafael J . Wysocki, linux-kernel, linux-arm-msm,
	linux-fsdevel, BCM Kernel Feedback, Olof Johansson,
	Andrew Morton, Dan Carpenter, Colin Ian King, Kees Cook,
	Takashi Iwai, linux-kselftest, Andy Gross, linux-integrity,
	linux-security-module, Scott Branden

Add FIRMWARE_PARTIAL_READ support for integrity
measurement on partial reads of firmware files.

Signed-off-by: Scott Branden <scott.branden@broadcom.com>
---
 drivers/base/firmware_loader/main.c |  6 +++++-
 fs/exec.c                           |  6 ++++--
 include/linux/fs.h                  |  1 +
 security/integrity/ima/ima_main.c   | 24 +++++++++++++++++++++++-
 4 files changed, 33 insertions(+), 4 deletions(-)

diff --git a/drivers/base/firmware_loader/main.c b/drivers/base/firmware_loader/main.c
index 93e7fee42cd4..d0c42194af17 100644
--- a/drivers/base/firmware_loader/main.c
+++ b/drivers/base/firmware_loader/main.c
@@ -483,7 +483,11 @@ fw_get_filesystem_firmware(struct device *device, struct fw_priv *fw_priv,
 	/* Already populated data member means we're loading into a buffer */
 	if (!decompress && fw_priv->data) {
 		buffer = fw_priv->data;
-		id = READING_FIRMWARE_PREALLOC_BUFFER;
+		if (fw_priv->opt == KERNEL_PREAD_PART)
+			id = READING_FIRMWARE_PARTIAL_READ;
+		else
+			id = READING_FIRMWARE_PREALLOC_BUFFER;
+
 		msize = fw_priv->allocated_size;
 	}
 
diff --git a/fs/exec.c b/fs/exec.c
index e5c241c07b75..3fbc2fee909f 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -968,7 +968,8 @@ int kernel_pread_file(struct file *file, void **buf, loff_t *size,
 		goto out;
 	}
 
-	if (id != READING_FIRMWARE_PREALLOC_BUFFER)
+	if ((id != READING_FIRMWARE_PARTIAL_READ) &&
+	    (id != READING_FIRMWARE_PREALLOC_BUFFER))
 		*buf = vmalloc(alloc_size);
 	if (!*buf) {
 		ret = -ENOMEM;
@@ -1000,7 +1001,8 @@ int kernel_pread_file(struct file *file, void **buf, loff_t *size,
 
 out_free:
 	if (ret < 0) {
-		if (id != READING_FIRMWARE_PREALLOC_BUFFER) {
+		if ((id != READING_FIRMWARE_PARTIAL_READ) &&
+		    (id != READING_FIRMWARE_PREALLOC_BUFFER)) {
 			vfree(*buf);
 			*buf = NULL;
 		}
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 76d463e4a628..3affcaa7c7b2 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -3020,6 +3020,7 @@ extern int do_pipe_flags(int *, int);
 #define __kernel_read_file_id(id) \
 	id(UNKNOWN, unknown)		\
 	id(FIRMWARE, firmware)		\
+	id(FIRMWARE_PARTIAL_READ, firmware)	\
 	id(FIRMWARE_PREALLOC_BUFFER, firmware)	\
 	id(FIRMWARE_EFI_EMBEDDED, firmware)	\
 	id(MODULE, kernel-module)		\
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index 800fb3bba418..982debd59cc4 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -609,6 +609,9 @@ void ima_post_path_mknod(struct dentry *dentry)
  */
 int ima_read_file(struct file *file, enum kernel_read_file_id read_id)
 {
+	enum ima_hooks func;
+	u32 secid;
+
 	/*
 	 * READING_FIRMWARE_PREALLOC_BUFFER
 	 *
@@ -617,11 +620,27 @@ int ima_read_file(struct file *file, enum kernel_read_file_id read_id)
 	 * of IMA's signature verification any more than when using two
 	 * buffers?
 	 */
-	return 0;
+	if (read_id != READING_FIRMWARE_PARTIAL_READ)
+		return 0;
+
+	if (!file) {
+		if ((ima_appraise & IMA_APPRAISE_FIRMWARE) &&
+		    (ima_appraise & IMA_APPRAISE_ENFORCE)) {
+			pr_err("Prevent firmware loading_store.\n");
+			return -EACCES;	/* INTEGRITY_UNKNOWN */
+		}
+		return 0;
+	}
+
+	func = read_idmap[read_id] ?: FILE_CHECK;
+	security_task_getsecid(current, &secid);
+	return process_measurement(file, current_cred(), secid, NULL,
+				   0, MAY_READ, func);
 }
 
 const int read_idmap[READING_MAX_ID] = {
 	[READING_FIRMWARE] = FIRMWARE_CHECK,
+	[READING_FIRMWARE_PARTIAL_READ] = FIRMWARE_CHECK,
 	[READING_FIRMWARE_PREALLOC_BUFFER] = FIRMWARE_CHECK,
 	[READING_MODULE] = MODULE_CHECK,
 	[READING_KEXEC_IMAGE] = KEXEC_KERNEL_CHECK,
@@ -648,6 +667,9 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
 	enum ima_hooks func;
 	u32 secid;
 
+	if (!file && read_id == READING_FIRMWARE_PARTIAL_READ)
+		return 0;
+
 	if (!file && read_id == READING_FIRMWARE) {
 		if ((ima_appraise & IMA_APPRAISE_FIRMWARE) &&
 		    (ima_appraise & IMA_APPRAISE_ENFORCE)) {
-- 
2.17.1


^ permalink raw reply related	[flat|nested] 13+ messages in thread
* Re: [PATCH v6 8/8] ima: add FIRMWARE_PARTIAL_READ support
  2020-06-05 22:59 ` [PATCH v6 8/8] ima: add FIRMWARE_PARTIAL_READ support Scott Branden
@ 2020-06-05 23:19   ` Mimi Zohar
  2020-06-05 23:31     ` Scott Branden
  0 siblings, 1 reply; 13+ messages in thread
From: Mimi Zohar @ 2020-06-05 23:19 UTC (permalink / raw)
  To: Scott Branden, Luis Chamberlain, Greg Kroah-Hartman, David Brown,
	Alexander Viro, Shuah Khan, bjorn.andersson, Shuah Khan,
	Arnd Bergmann
  Cc: Rafael J . Wysocki, linux-kernel, linux-arm-msm, linux-fsdevel,
	BCM Kernel Feedback, Olof Johansson, Andrew Morton,
	Dan Carpenter, Colin Ian King, Kees Cook, Takashi Iwai,
	linux-kselftest, Andy Gross, linux-integrity,
	linux-security-module

Hi Scott,

On Fri, 2020-06-05 at 15:59 -0700, Scott Branden wrote:
> 
> @@ -648,6 +667,9 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
>  	enum ima_hooks func;
>  	u32 secid;
>  
> +	if (!file && read_id == READING_FIRMWARE_PARTIAL_READ)
> +		return 0;

The file should be measured on the pre security hook, not here on the
post security hook.  Here, whether "file" is defined or not, is
irrelevant.  The test should just check "read_id".

Have you tested measuring the firmware by booting a system with
"ima_policy=tcb" specified on the boot command line and compared the
measurement entry in the IMA measurement list with the file hash (eg.
sha1sum, sha256sum)?

Mimi

> +
>  	if (!file && read_id == READING_FIRMWARE) {
>  		if ((ima_appraise & IMA_APPRAISE_FIRMWARE) &&
>  		    (ima_appraise & IMA_APPRAISE_ENFORCE)) {


^ permalink raw reply	[flat|nested] 13+ messages in thread
* Re: [PATCH v6 8/8] ima: add FIRMWARE_PARTIAL_READ support
  2020-06-05 23:19   ` Mimi Zohar
@ 2020-06-05 23:31     ` Scott Branden
  2020-06-05 23:48       ` Mimi Zohar
  0 siblings, 1 reply; 13+ messages in thread
From: Scott Branden @ 2020-06-05 23:31 UTC (permalink / raw)
  To: Mimi Zohar, Luis Chamberlain, Greg Kroah-Hartman, David Brown,
	Alexander Viro, Shuah Khan, bjorn.andersson, Shuah Khan,
	Arnd Bergmann
  Cc: Rafael J . Wysocki, linux-kernel, linux-arm-msm, linux-fsdevel,
	BCM Kernel Feedback, Olof Johansson, Andrew Morton,
	Dan Carpenter, Colin Ian King, Kees Cook, Takashi Iwai,
	linux-kselftest, Andy Gross, linux-integrity,
	linux-security-module

Hi Mimi,

On 2020-06-05 4:19 p.m., Mimi Zohar wrote:
> Hi Scott,
>
> On Fri, 2020-06-05 at 15:59 -0700, Scott Branden wrote:
>> @@ -648,6 +667,9 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
>>   	enum ima_hooks func;
>>   	u32 secid;
>>   
>> +	if (!file && read_id == READING_FIRMWARE_PARTIAL_READ)
>> +		return 0;
> The file should be measured on the pre security hook, not here on the
> post security hook.  Here, whether "file" is defined or not, is
> irrelevant.  The test should just check "read_id".
OK, will remove the !file from here.
>
> Have you tested measuring the firmware by booting a system with
> "ima_policy=tcb" specified on the boot command line and compared the
> measurement entry in the IMA measurement list with the file hash (eg.
> sha1sum, sha256sum)?
Yes, I enabled IMA in my kernel and added ima_policy=tsb to the boot 
command line,

Here are the entries from 
/sys/kernel/security/ima/ascii_runtime_measurements of the files I am 
accessing.
Please let me know if I am doing anything incorrectly.

10 4612bce355b2dbc45ecd95e17001636be8832c7f ima-ng 
sha1:fddd9a28c2b15acf3b0fc9ec0cf187cb2153d7f2 
/lib/firmware/vk-boot1-bcm958401m2.ecdsa.bin
10 4c0eb0fc30eb7ac3a30a27f05c1d2a8d28d6a9ec ima-ng 
sha1:b16d343dd63352d10309690c71b110762a9444c3 
/lib/firmware/vk-boot2-bcm958401m2_a72.ecdsn

The sha1 sum matches:
root@genericx86-64:/sys/kernel/security/ima# sha1sum 
/lib/firmware/vk-boot1-bcm958401m2.ecdsa.bin
fddd9a28c2b15acf3b0fc9ec0cf187cb2153d7f2 
/lib/firmware/vk-boot1-bcm958401m2.ecdsa.bin

root@genericx86-64:/sys/kernel/security/ima# sha1sum 
/lib/firmware/vk-boot2-bcm958401m2_a72.ecdsa.bin
b16d343dd63352d10309690c71b110762a9444c3 
/lib/firmware/vk-boot2-bcm958401m2_a72.ecdsa.bin


>
> Mimi
>
>> +
>>   	if (!file && read_id == READING_FIRMWARE) {
>>   		if ((ima_appraise & IMA_APPRAISE_FIRMWARE) &&
>>   		    (ima_appraise & IMA_APPRAISE_ENFORCE)) {


^ permalink raw reply	[flat|nested] 13+ messages in thread
* Re: [PATCH v6 8/8] ima: add FIRMWARE_PARTIAL_READ support
  2020-06-05 23:31     ` Scott Branden
@ 2020-06-05 23:48       ` Mimi Zohar
  0 siblings, 0 replies; 13+ messages in thread
From: Mimi Zohar @ 2020-06-05 23:48 UTC (permalink / raw)
  To: Scott Branden, Luis Chamberlain, Greg Kroah-Hartman, David Brown,
	Alexander Viro, Shuah Khan, bjorn.andersson, Shuah Khan,
	Arnd Bergmann
  Cc: Rafael J . Wysocki, linux-kernel, linux-arm-msm, linux-fsdevel,
	BCM Kernel Feedback, Olof Johansson, Andrew Morton,
	Dan Carpenter, Colin Ian King, Kees Cook, Takashi Iwai,
	linux-kselftest, Andy Gross, linux-integrity,
	linux-security-module

On Fri, 2020-06-05 at 16:31 -0700, Scott Branden wrote:
> Hi Mimi,
> 
> On 2020-06-05 4:19 p.m., Mimi Zohar wrote:
> > Hi Scott,
> >
> > On Fri, 2020-06-05 at 15:59 -0700, Scott Branden wrote:
> >> @@ -648,6 +667,9 @@ int ima_post_read_file(struct file *file, void *buf, loff_t size,
> >>   	enum ima_hooks func;
> >>   	u32 secid;
> >>   
> >> +	if (!file && read_id == READING_FIRMWARE_PARTIAL_READ)
> >> +		return 0;
> > The file should be measured on the pre security hook, not here on the
> > post security hook.  Here, whether "file" is defined or not, is
> > irrelevant.  The test should just check "read_id".
> OK, will remove the !file from here.

thanks!

> >
> > Have you tested measuring the firmware by booting a system with
> > "ima_policy=tcb" specified on the boot command line and compared the
> > measurement entry in the IMA measurement list with the file hash (eg.
> > sha1sum, sha256sum)?
> Yes, I enabled IMA in my kernel and added ima_policy=tsb to the boot 
> command line,
> 
> Here are the entries from 
> /sys/kernel/security/ima/ascii_runtime_measurements of the files I am 
> accessing.
> Please let me know if I am doing anything incorrectly.
> 
> 10 4612bce355b2dbc45ecd95e17001636be8832c7f ima-ng 
> sha1:fddd9a28c2b15acf3b0fc9ec0cf187cb2153d7f2 
> /lib/firmware/vk-boot1-bcm958401m2.ecdsa.bin
> 10 4c0eb0fc30eb7ac3a30a27f05c1d2a8d28d6a9ec ima-ng 
> sha1:b16d343dd63352d10309690c71b110762a9444c3 
> /lib/firmware/vk-boot2-bcm958401m2_a72.ecdsn
> 
> The sha1 sum matches:
> root@genericx86-64:/sys/kernel/security/ima# sha1sum 
> /lib/firmware/vk-boot1-bcm958401m2.ecdsa.bin
> fddd9a28c2b15acf3b0fc9ec0cf187cb2153d7f2 
> /lib/firmware/vk-boot1-bcm958401m2.ecdsa.bin
> 
> root@genericx86-64:/sys/kernel/security/ima# sha1sum 
> /lib/firmware/vk-boot2-bcm958401m2_a72.ecdsa.bin
> b16d343dd63352d10309690c71b110762a9444c3 
> /lib/firmware/vk-boot2-bcm958401m2_a72.ecdsa.bin

Looks good!

(FYI, a larger hash algorithm can be specified in the Kconfig or
"ima_hash=" on the boot command line.)

Mimi


^ permalink raw reply	[flat|nested] 13+ messages in thread
* Re: [PATCH v6 1/8] fs: introduce kernel_pread_file* support
  2020-06-05 22:59 ` [PATCH v6 1/8] fs: introduce kernel_pread_file* support Scott Branden
@ 2020-06-06  3:20   ` Matthew Wilcox
  2020-06-06  4:56     ` Scott Branden
  0 siblings, 1 reply; 13+ messages in thread
From: Matthew Wilcox @ 2020-06-06  3:20 UTC (permalink / raw)
  To: Scott Branden
  Cc: Luis Chamberlain, Greg Kroah-Hartman, David Brown,
	Alexander Viro, Shuah Khan, bjorn.andersson, Shuah Khan,
	Arnd Bergmann, Mimi Zohar, Rafael J . Wysocki, linux-kernel,
	linux-arm-msm, linux-fsdevel, BCM Kernel Feedback,
	Olof Johansson, Andrew Morton, Dan Carpenter, Colin Ian King,
	Kees Cook, Takashi Iwai, linux-kselftest, Andy Gross,
	linux-integrity, linux-security-module

On Fri, Jun 05, 2020 at 03:59:52PM -0700, Scott Branden wrote:
> -int kernel_read_file(struct file *file, void **buf, loff_t *size,
> -		     loff_t max_size, enum kernel_read_file_id id)
> -{
> -	loff_t i_size, pos;
> +int kernel_pread_file(struct file *file, void **buf, loff_t *size,
> +		      loff_t pos, loff_t max_size,
> +		      enum kernel_pread_opt opt,
> +		      enum kernel_read_file_id id)

What is this 'kernel_pread_opt' foolishness?  Why not just pass in
~0UL as max_size if you want the entire file?

> -int kernel_read_file_from_path_initns(const char *path, void **buf,
> -				      loff_t *size, loff_t max_size,
> -				      enum kernel_read_file_id id)
> +extern int kernel_pread_file_from_path_initns(const char *path, void **buf,

extern?  really?  i'm shocked gcc doesn't vomit on that.


^ permalink raw reply	[flat|nested] 13+ messages in thread
* Re: [PATCH v6 1/8] fs: introduce kernel_pread_file* support
  2020-06-06  3:20   ` Matthew Wilcox
@ 2020-06-06  4:56     ` Scott Branden
  0 siblings, 0 replies; 13+ messages in thread
From: Scott Branden @ 2020-06-06  4:56 UTC (permalink / raw)
  To: Matthew Wilcox
  Cc: Luis Chamberlain, Greg Kroah-Hartman, David Brown,
	Alexander Viro, Shuah Khan, bjorn.andersson, Shuah Khan,
	Arnd Bergmann, Mimi Zohar, Rafael J . Wysocki, linux-kernel,
	linux-arm-msm, linux-fsdevel, BCM Kernel Feedback,
	Olof Johansson, Andrew Morton, Dan Carpenter, Colin Ian King,
	Kees Cook, Takashi Iwai, linux-kselftest, Andy Gross,
	linux-integrity, linux-security-module

Hi Matthew,

On 2020-06-05 8:20 p.m., Matthew Wilcox wrote:
> On Fri, Jun 05, 2020 at 03:59:52PM -0700, Scott Branden wrote:
>> -int kernel_read_file(struct file *file, void **buf, loff_t *size,
>> -		     loff_t max_size, enum kernel_read_file_id id)
>> -{
>> -	loff_t i_size, pos;
>> +int kernel_pread_file(struct file *file, void **buf, loff_t *size,
>> +		      loff_t pos, loff_t max_size,
>> +		      enum kernel_pread_opt opt,
>> +		      enum kernel_read_file_id id)
> What is this 'kernel_pread_opt' foolishness?  Why not just pass in
> ~0UL as max_size if you want the entire file?
That is not how existing kernel_read_file api works - max_size is specified.
I guess not everyone has unlimited memory to read a file on any size.
>
>> -int kernel_read_file_from_path_initns(const char *path, void **buf,
>> -				      loff_t *size, loff_t max_size,
>> -				      enum kernel_read_file_id id)
>> +extern int kernel_pread_file_from_path_initns(const char *path, void **buf,
> extern?  really?  i'm shocked gcc doesn't vomit on that.
A typo.  thanks.  You'll have to ask the compiler gods about your shock.


^ permalink raw reply	[flat|nested] 13+ messages in thread
end of thread, other threads:[~2020-06-06  4:57 UTC | newest]

Thread overview: 13+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-06-05 22:59 [PATCH v6 0/8] firmware: add partial read support in request_firmware_into_buf Scott Branden
2020-06-05 22:59 ` [PATCH v6 1/8] fs: introduce kernel_pread_file* support Scott Branden
2020-06-06  3:20   ` Matthew Wilcox
2020-06-06  4:56     ` Scott Branden
2020-06-05 22:59 ` [PATCH v6 2/8] firmware: add offset to request_firmware_into_buf Scott Branden
2020-06-05 22:59 ` [PATCH v6 3/8] test_firmware: add partial read support for request_firmware_into_buf Scott Branden
2020-06-05 22:59 ` [PATCH v6 4/8] firmware: test partial file reads of request_firmware_into_buf Scott Branden
2020-06-05 22:59 ` [PATCH v6 5/8] bcm-vk: add bcm_vk UAPI Scott Branden
2020-06-05 22:59 ` [PATCH v6 7/8] MAINTAINERS: bcm-vk: add maintainer for Broadcom VK Driver Scott Branden
2020-06-05 22:59 ` [PATCH v6 8/8] ima: add FIRMWARE_PARTIAL_READ support Scott Branden
2020-06-05 23:19   ` Mimi Zohar
2020-06-05 23:31     ` Scott Branden
2020-06-05 23:48       ` Mimi Zohar

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