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Commit 76cc9580 authored by Kees Cook's avatar Kees Cook
Browse files

pstore: Replace arguments for write() API 



Similar to the pstore_info read() callback, there were too many arguments.
This switches to the new struct pstore_record pointer instead. This adds
"reason" and "part" to the record structure as well.

Signed-off-by: default avatarKees Cook <keescook@chromium.org>
parent 125cc42b

arch/powerpc/kernel/nvram_64.c

+8 −19
Original line number Diff line number Diff line
@@ -389,51 +389,40 @@ static int nvram_pstore_open(struct pstore_info *psi) 


/**

 * nvram_pstore_write - pstore write callback for nvram

 * @type:               Type of message logged

 * @reason:             reason behind dump (oops/panic)

 * @id:                 identifier to indicate the write performed

 * @part:               pstore writes data to registered buffer in parts,

 *                      part number will indicate the same.

 * @count:              Indicates oops count

 * @compressed:         Flag to indicate the log is compressed

 * @size:               number of bytes written to the registered buffer

 * @psi:                registered pstore_info structure

 * @record:             pstore record to write, with @id to be set

 *

 * Called by pstore_dump() when an oops or panic report is logged in the

 * printk buffer.

 * Returns 0 on successful write.

 */

static int nvram_pstore_write(enum pstore_type_id type,

				enum kmsg_dump_reason reason,

				u64 *id, unsigned int part, int count,

				bool compressed, size_t size,

				struct pstore_info *psi)

static int nvram_pstore_write(struct pstore_record *record)

{

	int rc;

	unsigned int err_type = ERR_TYPE_KERNEL_PANIC;

	struct oops_log_info *oops_hdr = (struct oops_log_info *) oops_buf;



	/* part 1 has the recent messages from printk buffer */

	if (part > 1 || (type != PSTORE_TYPE_DMESG))

	if (record->part > 1 || (record->type != PSTORE_TYPE_DMESG))

		return -1;



	if (clobbering_unread_rtas_event())

		return -1;



	oops_hdr->version = cpu_to_be16(OOPS_HDR_VERSION);

	oops_hdr->report_length = cpu_to_be16(size);

	oops_hdr->report_length = cpu_to_be16(record->size);

	oops_hdr->timestamp = cpu_to_be64(ktime_get_real_seconds());



	if (compressed)

	if (record->compressed)

		err_type = ERR_TYPE_KERNEL_PANIC_GZ;



	rc = nvram_write_os_partition(&oops_log_partition, oops_buf,

		(int) (sizeof(*oops_hdr) + size), err_type, count);

		(int) (sizeof(*oops_hdr) + record->size), err_type,

		record->count);



	if (rc != 0)

		return rc;



	*id = part;

	record->id = record->part;

	return 0;

}

drivers/acpi/apei/erst.c

+7 −11
Original line number Diff line number Diff line
@@ -926,9 +926,7 @@ static int erst_check_table(struct acpi_table_erst *erst_tab) 
static int erst_open_pstore(struct pstore_info *psi);

static int erst_close_pstore(struct pstore_info *psi);

static ssize_t erst_reader(struct pstore_record *record);

static int erst_writer(enum pstore_type_id type, enum kmsg_dump_reason reason,

		       u64 *id, unsigned int part, int count, bool compressed,

		       size_t size, struct pstore_info *psi);

static int erst_writer(struct pstore_record *record);

static int erst_clearer(enum pstore_type_id type, u64 id, int count,

			struct timespec time, struct pstore_info *psi);
@@ -1054,9 +1052,7 @@ static ssize_t erst_reader(struct pstore_record *record) 
	return (rc < 0) ? rc : (len - sizeof(*rcd));

}



static int erst_writer(enum pstore_type_id type, enum kmsg_dump_reason reason,

		       u64 *id, unsigned int part, int count, bool compressed,

		       size_t size, struct pstore_info *psi)

static int erst_writer(struct pstore_record *record)

{

	struct cper_pstore_record *rcd = (struct cper_pstore_record *)

					(erst_info.buf - sizeof(*rcd));
@@ -1071,21 +1067,21 @@ static int erst_writer(enum pstore_type_id type, enum kmsg_dump_reason reason, 
	/* timestamp valid. platform_id, partition_id are invalid */

	rcd->hdr.validation_bits = CPER_VALID_TIMESTAMP;

	rcd->hdr.timestamp = get_seconds();

	rcd->hdr.record_length = sizeof(*rcd) + size;

	rcd->hdr.record_length = sizeof(*rcd) + record->size;

	rcd->hdr.creator_id = CPER_CREATOR_PSTORE;

	rcd->hdr.notification_type = CPER_NOTIFY_MCE;

	rcd->hdr.record_id = cper_next_record_id();

	rcd->hdr.flags = CPER_HW_ERROR_FLAGS_PREVERR;



	rcd->sec_hdr.section_offset = sizeof(*rcd);

	rcd->sec_hdr.section_length = size;

	rcd->sec_hdr.section_length = record->size;

	rcd->sec_hdr.revision = CPER_SEC_REV;

	/* fru_id and fru_text is invalid */

	rcd->sec_hdr.validation_bits = 0;

	rcd->sec_hdr.flags = CPER_SEC_PRIMARY;

	switch (type) {

	switch (record->type) {

	case PSTORE_TYPE_DMESG:

		if (compressed)

		if (record->compressed)

			rcd->sec_hdr.section_type = CPER_SECTION_TYPE_DMESG_Z;

		else

			rcd->sec_hdr.section_type = CPER_SECTION_TYPE_DMESG;
@@ -1099,7 +1095,7 @@ static int erst_writer(enum pstore_type_id type, enum kmsg_dump_reason reason, 
	rcd->sec_hdr.section_severity = CPER_SEV_FATAL;



	ret = erst_write(&rcd->hdr);

	*id = rcd->hdr.record_id;

	record->id = rcd->hdr.record_id;



	return ret;

}

drivers/firmware/efi/efi-pstore.c

+8 −10
Original line number Diff line number Diff line
@@ -240,30 +240,28 @@ static ssize_t efi_pstore_read(struct pstore_record *record) 
	return size;

}



static int efi_pstore_write(enum pstore_type_id type,

		enum kmsg_dump_reason reason, u64 *id,

		unsigned int part, int count, bool compressed, size_t size,

		struct pstore_info *psi)

static int efi_pstore_write(struct pstore_record *record)

{

	char name[DUMP_NAME_LEN];

	efi_char16_t efi_name[DUMP_NAME_LEN];

	efi_guid_t vendor = LINUX_EFI_CRASH_GUID;

	int i, ret = 0;



	sprintf(name, "dump-type%u-%u-%d-%lu-%c", type, part, count,

		get_seconds(), compressed ? 'C' : 'D');

	snprintf(name, sizeof(name), "dump-type%u-%u-%d-%lu-%c",

		 record->type, record->part, record->count,

		 get_seconds(), record->compressed ? 'C' : 'D');



	for (i = 0; i < DUMP_NAME_LEN; i++)

		efi_name[i] = name[i];



	efivar_entry_set_safe(efi_name, vendor, PSTORE_EFI_ATTRIBUTES,

			      !pstore_cannot_block_path(reason),

			      size, psi->buf);

			      !pstore_cannot_block_path(record->reason),

			      record->size, record->psi->buf);



	if (reason == KMSG_DUMP_OOPS)

	if (record->reason == KMSG_DUMP_OOPS)

		efivar_run_worker();



	*id = part;

	record->id = record->part;

	return ret;

};

fs/pstore/platform.c

+35 −27
Original line number Diff line number Diff line
@@ -484,7 +484,6 @@ static void pstore_dump(struct kmsg_dumper *dumper, 
{

	unsigned long	total = 0;

	const char	*why;

	u64		id;

	unsigned int	part = 1;

	unsigned long	flags = 0;

	int		is_locked;
@@ -506,48 +505,59 @@ static void pstore_dump(struct kmsg_dumper *dumper, 
	oopscount++;

	while (total < kmsg_bytes) {

		char *dst;

		unsigned long size;

		int hsize;

		size_t dst_size;

		int header_size;

		int zipped_len = -1;

		size_t len;

		bool compressed = false;

		size_t total_len;

		size_t dump_size;

		struct pstore_record record = {

			.type = PSTORE_TYPE_DMESG,

			.count = oopscount,

			.reason = reason,

			.part = part,

			.compressed = false,

			.buf = psinfo->buf,

			.psi = psinfo,

		};



		if (big_oops_buf && is_locked) {

			dst = big_oops_buf;

			size = big_oops_buf_sz;

			dst_size = big_oops_buf_sz;

		} else {

			dst = psinfo->buf;

			size = psinfo->bufsize;

			dst_size = psinfo->bufsize;

		}



		hsize = sprintf(dst, "%s#%d Part%u\n", why, oopscount, part);

		size -= hsize;

		/* Write dump header. */

		header_size = snprintf(dst, dst_size, "%s#%d Part%u\n", why,

				 oopscount, part);

		dst_size -= header_size;



		if (!kmsg_dump_get_buffer(dumper, true, dst + hsize,

					  size, &len))

		/* Write dump contents. */

		if (!kmsg_dump_get_buffer(dumper, true, dst + header_size,

					  dst_size, &dump_size))

			break;



		if (big_oops_buf && is_locked) {

			zipped_len = pstore_compress(dst, psinfo->buf,

						hsize + len, psinfo->bufsize);

						header_size + dump_size,

						psinfo->bufsize);



			if (zipped_len > 0) {

				compressed = true;

				total_len = zipped_len;

				record.compressed = true;

				record.size = zipped_len;

			} else {

				total_len = copy_kmsg_to_buffer(hsize, len);

				record.size = copy_kmsg_to_buffer(header_size,

								  dump_size);

			}

		} else {

			total_len = hsize + len;

			record.size = header_size + dump_size;

		}



		ret = psinfo->write(PSTORE_TYPE_DMESG, reason, &id, part,

				    oopscount, compressed, total_len, psinfo);

		ret = psinfo->write(&record);

		if (ret == 0 && reason == KMSG_DUMP_OOPS && pstore_is_mounted())

			pstore_new_entry = 1;



		total += total_len;

		total += record.size;

		part++;

	}

	if (is_locked)
@@ -618,14 +628,12 @@ static void pstore_register_console(void) {} 
static void pstore_unregister_console(void) {}

#endif



static int pstore_write_compat(enum pstore_type_id type,

			       enum kmsg_dump_reason reason,

			       u64 *id, unsigned int part, int count,

			       bool compressed, size_t size,

			       struct pstore_info *psi)

static int pstore_write_compat(struct pstore_record *record)

{

	return psi->write_buf(type, reason, id, part, psinfo->buf, compressed,

			     size, psi);

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

				      &record->id, record->part,

				      psinfo->buf, record->compressed,

				      record->size, record->psi);

}



static int pstore_write_buf_user_compat(enum pstore_type_id type,

include/linux/pstore.h

+18 −18
Original line number Diff line number Diff line
@@ -54,23 +54,32 @@ struct pstore_info; 
 * @type:	pstore record type

 * @id:		per-type unique identifier for record

 * @time:	timestamp of the record

 * @count:	for PSTORE_TYPE_DMESG, the Oops count.

 * @compressed:	for PSTORE_TYPE_DMESG, whether the buffer is compressed

 * @buf:	pointer to record contents

 * @size:	size of @buf

 * @ecc_notice_size:

 *		ECC information for @buf

 *

 * Valid for PSTORE_TYPE_DMESG @type:

 *

 * @count:	Oops count since boot

 * @reason:	kdump reason for notification

 * @part:	position in a multipart record

 * @compressed:	whether the buffer is compressed

 *

 */

struct pstore_record {

	struct pstore_info	*psi;

	enum pstore_type_id	type;

	u64			id;

	struct timespec		time;

	int			count;

	bool			compressed;

	char			*buf;

	ssize_t			size;

	ssize_t			ecc_notice_size;



	int			count;

	enum kmsg_dump_reason	reason;

	unsigned int		part;

	bool			compressed;

};



/**
@@ -125,16 +134,10 @@ struct pstore_record { 
 *	data to be stored has already been written to the registered @buf

 *	of the @psi structure.

 *

 *	@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

 *	@count:	in: increasing from 0 since boot, the number of this Oops

 *	@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. Note that @buf is NULL, since

 *		the @buf registered with @psi is what has been written. The

 *		backend is expected to update @id.

 *

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

 *
@@ -203,10 +206,7 @@ struct pstore_info { 
	int		(*open)(struct pstore_info *psi);

	int		(*close)(struct pstore_info *psi);

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

	int		(*write)(enum pstore_type_id type,

			enum kmsg_dump_reason reason, u64 *id,

			unsigned int part, int count, bool compressed,

			size_t size, struct pstore_info *psi);

	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,