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Commit fdd03118 authored by Kees Cook's avatar Kees Cook
Browse files

pstore: Replace arguments for write_buf_user() API 



Removes argument list in favor of pstore record, though the user buffer
remains passed separately since it must carry the __user annotation.

Signed-off-by: default avatarKees Cook <keescook@chromium.org>
parent b10b4711

fs/pstore/platform.c

+12 −23
Original line number Diff line number Diff line
@@ -639,47 +639,36 @@ static int pstore_write_compat(struct pstore_record *record) 
	return record->psi->write_buf(record);

}



static int pstore_write_buf_user_compat(enum pstore_type_id type,

			       enum kmsg_dump_reason reason,

			       u64 *id, unsigned int part,

			       const char __user *buf,

			       bool compressed, size_t size,

			       struct pstore_info *psi)

static int pstore_write_buf_user_compat(struct pstore_record *record,

					const char __user *buf)

{

	unsigned long flags = 0;

	size_t i, bufsize = size;

	size_t i, bufsize, total_size = record->size;

	long ret = 0;



	if (unlikely(!access_ok(VERIFY_READ, buf, size)))

	if (unlikely(!access_ok(VERIFY_READ, buf, total_size)))

		return -EFAULT;

	bufsize = total_size;

	if (bufsize > psinfo->bufsize)

		bufsize = psinfo->bufsize;

	record->buf = psinfo->buf;

	spin_lock_irqsave(&psinfo->buf_lock, flags);

	for (i = 0; i < size; ) {

		struct pstore_record record = {

			.type = type,

			.reason = reason,

			.id = id,

			.part = part,

			.buf = psinfo->buf,

			.compressed = compressed,

			.psi = psi,

		};

		size_t c = min(size - i, bufsize);

	for (i = 0; i < total_size; ) {

		size_t c = min(total_size - i, bufsize);



		ret = __copy_from_user(psinfo->buf, buf + i, c);

		ret = __copy_from_user(record->buf, buf + i, c);

		if (unlikely(ret != 0)) {

			ret = -EFAULT;

			break;

		}

		record.size = c;

		ret = psi->write_buf(&record);

		record->size = c;

		ret = record->psi->write_buf(record);

		if (unlikely(ret < 0))

			break;

		i += c;

	}

	spin_unlock_irqrestore(&psinfo->buf_lock, flags);

	return unlikely(ret < 0) ? ret : size;

	return unlikely(ret < 0) ? ret : total_size;

}



/*

fs/pstore/pmsg.c

+6 −3
Original line number Diff line number Diff line
@@ -23,7 +23,11 @@ static DEFINE_MUTEX(pmsg_lock); 
static ssize_t write_pmsg(struct file *file, const char __user *buf,

			  size_t count, loff_t *ppos)

{

	u64 id;

	struct pstore_record record = {

		.type = PSTORE_TYPE_PMSG,

		.size = count,

		.psi = psinfo,

	};

	int ret;



	if (!count)
@@ -34,8 +38,7 @@ static ssize_t write_pmsg(struct file *file, const char __user *buf, 
		return -EFAULT;



	mutex_lock(&pmsg_lock);

	ret = psinfo->write_buf_user(PSTORE_TYPE_PMSG, 0, &id, 0, buf, 0, count,

				     psinfo);

	ret = psinfo->write_buf_user(&record, buf);

	mutex_unlock(&pmsg_lock);

	return ret ? ret : count;

}

fs/pstore/ram.c

+5 −9
Original line number Diff line number Diff line
@@ -451,19 +451,15 @@ static int notrace ramoops_pstore_write_buf(struct pstore_record *record) 
	return 0;

}



static int notrace ramoops_pstore_write_buf_user(enum pstore_type_id type,

						 enum kmsg_dump_reason reason,

						 u64 *id, unsigned int part,

						 const char __user *buf,

						 bool compressed, size_t size,

						 struct pstore_info *psi)

static int notrace ramoops_pstore_write_buf_user(struct pstore_record *record,

						 const char __user *buf)

{

	if (type == PSTORE_TYPE_PMSG) {

		struct ramoops_context *cxt = psi->data;

	if (record->type == PSTORE_TYPE_PMSG) {

		struct ramoops_context *cxt = record->psi->data;



		if (!cxt->mprz)

			return -ENOMEM;

		return persistent_ram_write_user(cxt->mprz, buf, size);

		return persistent_ram_write_user(cxt->mprz, buf, record->size);

	}



	return -EINVAL;

include/linux/pstore.h

+7 −16
Original line number Diff line number Diff line
@@ -152,18 +152,11 @@ struct pstore_record { 
 *

 * @write_buf_user:

 *	Perform a frontend write to a backend record, using a specified

 *	buffer that is coming directly from userspace.

 *

 *	@type:	in: pstore record type to write

 *	@reason:

 *		in: pstore write reason

 *	@id:	out: unique identifier for the record

 *	@part:	in: position in a multipart write

 *	@buf:	in: pointer to userspace contents to write to backend record

 *	@compressed:

 *		in: if the record is compressed

 *	@size:	in: size of the write

 *	@psi:	in: pointer to the struct pstore_info for the backend

 *	buffer that is coming directly from userspace, instead of the

 *	@record @buf.

 *

 *	@record:	pointer to record metadata.

 *	@buf:		pointer to userspace contents to write to backend

 *

 *	Returns 0 on success, and non-zero on error.

 *
@@ -196,10 +189,8 @@ struct pstore_info { 
	ssize_t		(*read)(struct pstore_record *record);

	int		(*write)(struct pstore_record *record);

	int		(*write_buf)(struct pstore_record *record);

	int		(*write_buf_user)(enum pstore_type_id type,

			enum kmsg_dump_reason reason, u64 *id,

			unsigned int part, const char __user *buf,

			bool compressed, size_t size, struct pstore_info *psi);

	int		(*write_buf_user)(struct pstore_record *record,

					  const char __user *buf);

	int		(*erase)(struct pstore_record *record);

};