Commit 8cfc8ddc authored by Geliang Tang's avatar Geliang Tang Committed by Kees Cook
Browse files

pstore: add lzo/lz4 compression support 



Like zlib compression in pstore, this patch added lzo and lz4
compression support so that users can have more options and better
compression ratio.

The original code treats the compressed data together with the
uncompressed ECC correction notice by using zlib decompress. The
ECC correction notice is missing in the decompression process. The
treatment also makes lzo and lz4 not working. So I treat them
separately by using pstore_decompress() to treat the compressed
data, and memcpy() to treat the uncompressed ECC correction notice.

Signed-off-by: default avatarGeliang Tang <geliangtang@163.com>
Signed-off-by: default avatarKees Cook <keescook@chromium.org>
parent 235f6d15

arch/powerpc/kernel/nvram_64.c

+3 −1
Original line number Diff line number Diff line
@@ -444,7 +444,8 @@ static int nvram_pstore_write(enum pstore_type_id type, 
 */

static ssize_t nvram_pstore_read(u64 *id, enum pstore_type_id *type,

				int *count, struct timespec *time, char **buf,

				bool *compressed, struct pstore_info *psi)

				bool *compressed, ssize_t *ecc_notice_size,

				struct pstore_info *psi)

{

	struct oops_log_info *oops_hdr;

	unsigned int err_type, id_no, size = 0;
@@ -545,6 +546,7 @@ static ssize_t nvram_pstore_read(u64 *id, enum pstore_type_id *type, 
			return -ENOMEM;

		kfree(buff);



		*ecc_notice_size = 0;

		if (err_type == ERR_TYPE_KERNEL_PANIC_GZ)

			*compressed = true;

		else

drivers/acpi/apei/erst.c

+5 −2
Original line number Diff line number Diff line
@@ -927,7 +927,8 @@ static int erst_open_pstore(struct pstore_info *psi); 
static int erst_close_pstore(struct pstore_info *psi);

static ssize_t erst_reader(u64 *id, enum pstore_type_id *type, int *count,

			   struct timespec *time, char **buf,

			   bool *compressed, struct pstore_info *psi);

			   bool *compressed, ssize_t *ecc_notice_size,

			   struct pstore_info *psi);

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);
@@ -987,7 +988,8 @@ static int erst_close_pstore(struct pstore_info *psi) 


static ssize_t erst_reader(u64 *id, enum pstore_type_id *type, int *count,

			   struct timespec *time, char **buf,

			   bool *compressed, struct pstore_info *psi)

			   bool *compressed, ssize_t *ecc_notice_size,

			   struct pstore_info *psi)

{

	int rc;

	ssize_t len = 0;
@@ -1033,6 +1035,7 @@ skip: 
	memcpy(*buf, rcd->data, len - sizeof(*rcd));

	*id = record_id;

	*compressed = false;

	*ecc_notice_size = 0;

	if (uuid_le_cmp(rcd->sec_hdr.section_type,

			CPER_SECTION_TYPE_DMESG_Z) == 0) {

		*type = PSTORE_TYPE_DMESG;

drivers/firmware/efi/efi-pstore.c

+6 −0
Original line number Diff line number Diff line
@@ -34,6 +34,7 @@ struct pstore_read_data { 
	int *count;

	struct timespec *timespec;

	bool *compressed;

	ssize_t *ecc_notice_size;

	char **buf;

};
@@ -69,6 +70,7 @@ static int efi_pstore_read_func(struct efivar_entry *entry, void *data) 
			*cb_data->compressed = true;

		else

			*cb_data->compressed = false;

		*cb_data->ecc_notice_size = 0;

	} else if (sscanf(name, "dump-type%u-%u-%d-%lu",

		   cb_data->type, &part, &cnt, &time) == 4) {

		*cb_data->id = generic_id(time, part, cnt);
@@ -76,6 +78,7 @@ static int efi_pstore_read_func(struct efivar_entry *entry, void *data) 
		cb_data->timespec->tv_sec = time;

		cb_data->timespec->tv_nsec = 0;

		*cb_data->compressed = false;

		*cb_data->ecc_notice_size = 0;

	} else if (sscanf(name, "dump-type%u-%u-%lu",

			  cb_data->type, &part, &time) == 3) {

		/*
@@ -88,6 +91,7 @@ static int efi_pstore_read_func(struct efivar_entry *entry, void *data) 
		cb_data->timespec->tv_sec = time;

		cb_data->timespec->tv_nsec = 0;

		*cb_data->compressed = false;

		*cb_data->ecc_notice_size = 0;

	} else

		return 0;
@@ -210,6 +214,7 @@ static int efi_pstore_sysfs_entry_iter(void *data, struct efivar_entry **pos) 
static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type,

			       int *count, struct timespec *timespec,

			       char **buf, bool *compressed,

			       ssize_t *ecc_notice_size,

			       struct pstore_info *psi)

{

	struct pstore_read_data data;
@@ -220,6 +225,7 @@ static ssize_t efi_pstore_read(u64 *id, enum pstore_type_id *type, 
	data.count = count;

	data.timespec = timespec;

	data.compressed = compressed;

	data.ecc_notice_size = ecc_notice_size;

	data.buf = buf;



	*data.buf = kzalloc(EFIVARS_DATA_SIZE_MAX, GFP_KERNEL);

fs/pstore/Kconfig

+29 −2
Original line number Diff line number Diff line 
config PSTORE

	tristate "Persistent store support"

	default n

	select ZLIB_DEFLATE

	select ZLIB_INFLATE

	help

	   This option enables generic access to platform level

	   persistent storage via "pstore" filesystem that can
@@ -14,6 +12,35 @@ config PSTORE 
	   If you don't have a platform persistent store driver,

	   say N.



choice

        prompt "Choose compression algorithm"

        depends on PSTORE

        default PSTORE_ZLIB_COMPRESS

        help

          This option chooses compression algorithm.



config PSTORE_ZLIB_COMPRESS

        bool "ZLIB"

        select ZLIB_DEFLATE

        select ZLIB_INFLATE

        help

          This option enables ZLIB compression algorithm support.



config PSTORE_LZO_COMPRESS

        bool "LZO"

        select LZO_COMPRESS

        select LZO_DECOMPRESS

        help

          This option enables LZO compression algorithm support.



config PSTORE_LZ4_COMPRESS

        bool "LZ4"

        select LZ4_COMPRESS

        select LZ4_DECOMPRESS

        help

          This option enables LZ4 compression algorithm support.

endchoice



config PSTORE_CONSOLE

	bool "Log kernel console messages"

	depends on PSTORE

fs/pstore/platform.c

+211 −7
Original line number Diff line number Diff line
@@ -28,7 +28,15 @@ 
#include <linux/console.h>

#include <linux/module.h>

#include <linux/pstore.h>

#ifdef CONFIG_PSTORE_ZLIB_COMPRESS

#include <linux/zlib.h>

#endif

#ifdef CONFIG_PSTORE_LZO_COMPRESS

#include <linux/lzo.h>

#endif

#ifdef CONFIG_PSTORE_LZ4_COMPRESS

#include <linux/lz4.h>

#endif

#include <linux/string.h>

#include <linux/timer.h>

#include <linux/slab.h>
@@ -69,10 +77,23 @@ struct pstore_info *psinfo; 
static char *backend;



/* Compression parameters */

#ifdef CONFIG_PSTORE_ZLIB_COMPRESS

#define COMPR_LEVEL 6

#define WINDOW_BITS 12

#define MEM_LEVEL 4

static struct z_stream_s stream;

#else

static unsigned char *workspace;

#endif



struct pstore_zbackend {

	int (*compress)(const void *in, void *out, size_t inlen, size_t outlen);

	int (*decompress)(void *in, void *out, size_t inlen, size_t outlen);

	void (*allocate)(void);

	void (*free)(void);



	const char *name;

};



static char *big_oops_buf;

static size_t big_oops_buf_sz;
@@ -129,9 +150,9 @@ bool pstore_cannot_block_path(enum kmsg_dump_reason reason) 
}

EXPORT_SYMBOL_GPL(pstore_cannot_block_path);



#ifdef CONFIG_PSTORE_ZLIB_COMPRESS

/* Derived from logfs_compress() */

static int pstore_compress(const void *in, void *out, size_t inlen,

							size_t outlen)

static int compress_zlib(const void *in, void *out, size_t inlen, size_t outlen)

{

	int err, ret;
@@ -165,7 +186,7 @@ error: 
}



/* Derived from logfs_uncompress */

static int pstore_decompress(void *in, void *out, size_t inlen, size_t outlen)

static int decompress_zlib(void *in, void *out, size_t inlen, size_t outlen)

{

	int err, ret;
@@ -194,7 +215,7 @@ error: 
	return ret;

}



static void allocate_buf_for_compression(void)

static void allocate_zlib(void)

{

	size_t size;

	size_t cmpr;
@@ -237,12 +258,190 @@ static void allocate_buf_for_compression(void) 


}



static void free_buf_for_compression(void)

static void free_zlib(void)

{

	kfree(stream.workspace);

	stream.workspace = NULL;

	kfree(big_oops_buf);

	big_oops_buf = NULL;

	big_oops_buf_sz = 0;

}



static struct pstore_zbackend backend_zlib = {

	.compress	= compress_zlib,

	.decompress	= decompress_zlib,

	.allocate	= allocate_zlib,

	.free		= free_zlib,

	.name		= "zlib",

};

#endif



#ifdef CONFIG_PSTORE_LZO_COMPRESS

static int compress_lzo(const void *in, void *out, size_t inlen, size_t outlen)

{

	int ret;



	ret = lzo1x_1_compress(in, inlen, out, &outlen, workspace);

	if (ret != LZO_E_OK) {

		pr_err("lzo_compress error, ret = %d!\n", ret);

		return -EIO;

	}



	return outlen;

}



static int decompress_lzo(void *in, void *out, size_t inlen, size_t outlen)

{

	int ret;



	ret = lzo1x_decompress_safe(in, inlen, out, &outlen);

	if (ret != LZO_E_OK) {

		pr_err("lzo_decompress error, ret = %d!\n", ret);

		return -EIO;

	}



	return outlen;

}



static void allocate_lzo(void)

{

	big_oops_buf_sz = lzo1x_worst_compress(psinfo->bufsize);

	big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);

	if (big_oops_buf) {

		workspace = kmalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL);

		if (!workspace) {

			pr_err("No memory for compression workspace; skipping compression\n");

			kfree(big_oops_buf);

			big_oops_buf = NULL;

		}

	} else {

		pr_err("No memory for uncompressed data; skipping compression\n");

		workspace = NULL;

	}

}



static void free_lzo(void)

{

	kfree(workspace);

	kfree(big_oops_buf);

	big_oops_buf = NULL;

	big_oops_buf_sz = 0;

}



static struct pstore_zbackend backend_lzo = {

	.compress	= compress_lzo,

	.decompress	= decompress_lzo,

	.allocate	= allocate_lzo,

	.free		= free_lzo,

	.name		= "lzo",

};

#endif



#ifdef CONFIG_PSTORE_LZ4_COMPRESS

static int compress_lz4(const void *in, void *out, size_t inlen, size_t outlen)

{

	int ret;



	ret = lz4_compress(in, inlen, out, &outlen, workspace);

	if (ret) {

		pr_err("lz4_compress error, ret = %d!\n", ret);

		return -EIO;

	}



	return outlen;

}



static int decompress_lz4(void *in, void *out, size_t inlen, size_t outlen)

{

	int ret;



	ret = lz4_decompress_unknownoutputsize(in, inlen, out, &outlen);

	if (ret) {

		pr_err("lz4_decompress error, ret = %d!\n", ret);

		return -EIO;

	}



	return outlen;

}



static void allocate_lz4(void)

{

	big_oops_buf_sz = lz4_compressbound(psinfo->bufsize);

	big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);

	if (big_oops_buf) {

		workspace = kmalloc(LZ4_MEM_COMPRESS, GFP_KERNEL);

		if (!workspace) {

			pr_err("No memory for compression workspace; skipping compression\n");

			kfree(big_oops_buf);

			big_oops_buf = NULL;

		}

	} else {

		pr_err("No memory for uncompressed data; skipping compression\n");

		workspace = NULL;

	}

}



static void free_lz4(void)

{

	kfree(workspace);

	kfree(big_oops_buf);

	big_oops_buf = NULL;

	big_oops_buf_sz = 0;

}



static struct pstore_zbackend backend_lz4 = {

	.compress	= compress_lz4,

	.decompress	= decompress_lz4,

	.allocate	= allocate_lz4,

	.free		= free_lz4,

	.name		= "lz4",

};

#endif



static struct pstore_zbackend *zbackend =

#if defined(CONFIG_PSTORE_ZLIB_COMPRESS)

	&backend_zlib;

#elif defined(CONFIG_PSTORE_LZO_COMPRESS)

	&backend_lzo;

#elif defined(CONFIG_PSTORE_LZ4_COMPRESS)

	&backend_lz4;

#else

	NULL;

#endif



static int pstore_compress(const void *in, void *out,

			   size_t inlen, size_t outlen)

{

	if (zbackend)

		return zbackend->compress(in, out, inlen, outlen);

	else

		return -EIO;

}



static int pstore_decompress(void *in, void *out, size_t inlen, size_t outlen)

{

	if (zbackend)

		return zbackend->decompress(in, out, inlen, outlen);

	else

		return -EIO;

}



static void allocate_buf_for_compression(void)

{

	if (zbackend) {

		pr_info("using %s compression\n", zbackend->name);

		zbackend->allocate();

	} else {

		pr_err("allocate compression buffer error!\n");

	}

}



static void free_buf_for_compression(void)

{

	if (zbackend)

		zbackend->free();

	else

		pr_err("free compression buffer error!\n");

}



/*
@@ -522,6 +721,7 @@ void pstore_get_records(int quiet) 
	int			failed = 0, rc;

	bool			compressed;

	int			unzipped_len = -1;

	ssize_t			ecc_notice_size = 0;



	if (!psi)

		return;
@@ -531,7 +731,7 @@ void pstore_get_records(int quiet) 
		goto out;



	while ((size = psi->read(&id, &type, &count, &time, &buf, &compressed,

				psi)) > 0) {

				 &ecc_notice_size, psi)) > 0) {

		if (compressed && (type == PSTORE_TYPE_DMESG)) {

			if (big_oops_buf)

				unzipped_len = pstore_decompress(buf,
@@ -539,6 +739,9 @@ void pstore_get_records(int quiet) 
							big_oops_buf_sz);



			if (unzipped_len > 0) {

				if (ecc_notice_size)

					memcpy(big_oops_buf + unzipped_len,

					       buf + size, ecc_notice_size);

				kfree(buf);

				buf = big_oops_buf;

				size = unzipped_len;
@@ -550,7 +753,8 @@ void pstore_get_records(int quiet) 
			}

		}

		rc = pstore_mkfile(type, psi->name, id, count, buf,

				  compressed, (size_t)size, time, psi);

				   compressed, size + ecc_notice_size,

				   time, psi);

		if (unzipped_len < 0) {

			/* Free buffer other than big oops */

			kfree(buf);

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