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Commit b10b4711 authored by Kees Cook's avatar Kees Cook
Browse files

pstore: Replace arguments for write_buf() API 



As with the other API updates, this removes the long argument list in favor
of passing a single pstore recaord.

Signed-off-by: default avatarKees Cook <keescook@chromium.org>
parent a61072aa

fs/pstore/ftrace.c

+7 −2
Original line number Diff line number Diff line
@@ -37,6 +37,12 @@ static void notrace pstore_ftrace_call(unsigned long ip, 
{

	unsigned long flags;

	struct pstore_ftrace_record rec = {};

	struct pstore_record record = {

		.type = PSTORE_TYPE_FTRACE,

		.buf = (char *)&rec,

		.size = sizeof(rec),

		.psi = psinfo,

	};



	if (unlikely(oops_in_progress))

		return;
@@ -47,8 +53,7 @@ static void notrace pstore_ftrace_call(unsigned long ip, 
	rec.parent_ip = parent_ip;

	pstore_ftrace_write_timestamp(&rec, pstore_ftrace_stamp++);

	pstore_ftrace_encode_cpu(&rec, raw_smp_processor_id());

	psinfo->write_buf(PSTORE_TYPE_FTRACE, 0, NULL, 0, (void *)&rec,

			  0, sizeof(rec), psinfo);

	psinfo->write_buf(&record);



	local_irq_restore(flags);

}

fs/pstore/platform.c

+21 −9
Original line number Diff line number Diff line
@@ -587,8 +587,11 @@ static void pstore_console_write(struct console *con, const char *s, unsigned c) 
	const char *e = s + c;



	while (s < e) {

		struct pstore_record record = {

			.type = PSTORE_TYPE_CONSOLE,

			.psi = psinfo,

		};

		unsigned long flags;

		u64 id;



		if (c > psinfo->bufsize)

			c = psinfo->bufsize;
@@ -599,8 +602,9 @@ static void pstore_console_write(struct console *con, const char *s, unsigned c) 
		} else {

			spin_lock_irqsave(&psinfo->buf_lock, flags);

		}

		psinfo->write_buf(PSTORE_TYPE_CONSOLE, 0, &id, 0,

				  s, 0, c, psinfo);

		record.buf = (char *)s;

		record.size = c;

		psinfo->write_buf(&record);

		spin_unlock_irqrestore(&psinfo->buf_lock, flags);

		s += c;

		c = e - s;
@@ -630,10 +634,9 @@ static void pstore_unregister_console(void) {} 


static int pstore_write_compat(struct pstore_record *record)

{

	return record->psi->write_buf(record->type, record->reason,

				      &record->id, record->part,

				      psinfo->buf, record->compressed,

				      record->size, record->psi);

	record->buf = psinfo->buf;



	return record->psi->write_buf(record);

}



static int pstore_write_buf_user_compat(enum pstore_type_id type,
@@ -653,6 +656,15 @@ static int pstore_write_buf_user_compat(enum pstore_type_id type, 
		bufsize = psinfo->bufsize;

	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);



		ret = __copy_from_user(psinfo->buf, buf + i, c);
@@ -660,8 +672,8 @@ static int pstore_write_buf_user_compat(enum pstore_type_id type, 
			ret = -EFAULT;

			break;

		}

		ret = psi->write_buf(type, reason, id, part, psinfo->buf,

				     compressed, c, psi);

		record.size = c;

		ret = psi->write_buf(&record);

		if (unlikely(ret < 0))

			break;

		i += c;

fs/pstore/ram.c

+22 −22
Original line number Diff line number Diff line
@@ -378,23 +378,18 @@ static size_t ramoops_write_kmsg_hdr(struct persistent_ram_zone *prz, 
	return len;

}



static int notrace ramoops_pstore_write_buf(enum pstore_type_id type,

					    enum kmsg_dump_reason reason,

					    u64 *id, unsigned int part,

					    const char *buf,

					    bool compressed, size_t size,

					    struct pstore_info *psi)

static int notrace ramoops_pstore_write_buf(struct pstore_record *record)

{

	struct ramoops_context *cxt = psi->data;

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

	struct persistent_ram_zone *prz;

	size_t hlen;

	size_t size, hlen;



	if (type == PSTORE_TYPE_CONSOLE) {

	if (record->type == PSTORE_TYPE_CONSOLE) {

		if (!cxt->cprz)

			return -ENOMEM;

		persistent_ram_write(cxt->cprz, buf, size);

		persistent_ram_write(cxt->cprz, record->buf, record->size);

		return 0;

	} else if (type == PSTORE_TYPE_FTRACE) {

	} else if (record->type == PSTORE_TYPE_FTRACE) {

		int zonenum;



		if (!cxt->fprzs)
@@ -407,33 +402,36 @@ static int notrace ramoops_pstore_write_buf(enum pstore_type_id type, 
		else

			zonenum = 0;



		persistent_ram_write(cxt->fprzs[zonenum], buf, size);

		persistent_ram_write(cxt->fprzs[zonenum], record->buf,

				     record->size);

		return 0;

	} else if (type == PSTORE_TYPE_PMSG) {

	} else if (record->type == PSTORE_TYPE_PMSG) {

		pr_warn_ratelimited("PMSG shouldn't call %s\n", __func__);

		return -EINVAL;

	}



	if (type != PSTORE_TYPE_DMESG)

	if (record->type != PSTORE_TYPE_DMESG)

		return -EINVAL;



	/* Out of the various dmesg dump types, ramoops is currently designed

	/*

	 * Out of the various dmesg dump types, ramoops is currently designed

	 * to only store crash logs, rather than storing general kernel logs.

	 */

	if (reason != KMSG_DUMP_OOPS &&

	    reason != KMSG_DUMP_PANIC)

	if (record->reason != KMSG_DUMP_OOPS &&

	    record->reason != KMSG_DUMP_PANIC)

		return -EINVAL;



	/* Skip Oopes when configured to do so. */

	if (reason == KMSG_DUMP_OOPS && !cxt->dump_oops)

	if (record->reason == KMSG_DUMP_OOPS && !cxt->dump_oops)

		return -EINVAL;



	/* Explicitly only take the first part of any new crash.

	/*

	 * Explicitly only take the first part of any new crash.

	 * If our buffer is larger than kmsg_bytes, this can never happen,

	 * and if our buffer is smaller than kmsg_bytes, we don't want the

	 * report split across multiple records.

	 */

	if (part != 1)

	if (record->part != 1)

		return -ENOSPC;



	if (!cxt->dprzs)
@@ -441,10 +439,12 @@ static int notrace ramoops_pstore_write_buf(enum pstore_type_id type, 


	prz = cxt->dprzs[cxt->dump_write_cnt];



	hlen = ramoops_write_kmsg_hdr(prz, compressed);

	/* Build header and append record contents. */

	hlen = ramoops_write_kmsg_hdr(prz, record->compressed);

	size = record->size;

	if (size + hlen > prz->buffer_size)

		size = prz->buffer_size - hlen;

	persistent_ram_write(prz, buf, size);

	persistent_ram_write(prz, record->buf, size);



	cxt->dump_write_cnt = (cxt->dump_write_cnt + 1) % cxt->max_dump_cnt;

include/linux/pstore.h

+5 −16
Original line number Diff line number Diff line
@@ -142,19 +142,11 @@ struct pstore_record { 
 *	Returns 0 on success, and non-zero on error.

 *

 * @write_buf:

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

 *	buffer. Unlike @write, this does not use the @psi @buf.

 *	Perform a frontend write to a backend record. The record contains

 *	all metadata and the buffer to write to backend storage. (Unlike

 *	@write, this does not use the @psi @buf.)

 *

 *	@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 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

 *	@record:	pointer to record metadata.

 *

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

 *
@@ -203,10 +195,7 @@ struct pstore_info { 
	int		(*close)(struct pstore_info *psi);

	ssize_t		(*read)(struct pstore_record *record);

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

	int		(*write_buf)(enum pstore_type_id type,

			enum kmsg_dump_reason reason, u64 *id,

			unsigned int part, const char *buf, bool compressed,

			size_t size, struct pstore_info *psi);

	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,