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- Add lz4hc and 842 to pstore compression options (Geliang Tang) 

- Refactor to use crypto compression API (Geliang Tang)
 - Fix up Kconfig dependencies for compression (Arnd Bergmann)
 - Allow for run-time compression selection
 - Remove stack VLA usage
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 Version: GnuPG v1
 Comment: Kees Cook <kees@outflux.net>
 
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Merge tag 'pstore-v4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux

Pull pstore updates from Kees Cook:
 "This cycle was almost entirely improvements to the pstore compression
  options, noted below:

   - Add lz4hc and 842 to pstore compression options (Geliang Tang)

   - Refactor to use crypto compression API (Geliang Tang)

   - Fix up Kconfig dependencies for compression (Arnd Bergmann)

   - Allow for run-time compression selection

   - Remove stack VLA usage"

* tag 'pstore-v4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux:
  pstore: fix crypto dependencies
  pstore: Use crypto compress API
  pstore/ram: Do not use stack VLA for parity workspace
  pstore: Select compression at runtime
  pstore: Avoid size casts for 842 compression
  pstore: Add lz4hc and 842 compression support
This commit is contained in:
Linus Torvalds 2018-04-06 14:59:01 -07:00
parent 3b54765cca 58eb5b6707
commit 69824bcc4b
7 changed files with 243 additions and 301 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

101
fs/pstore/Kconfig
View File

@ -1,5 +1,6 @@
config PSTORE config PSTORE
tristate "Persistent store support" tristate "Persistent store support"
select CRYPTO if PSTORE_COMPRESS
default n default n
help help
This option enables generic access to platform level This option enables generic access to platform level
@ -12,35 +13,89 @@ config PSTORE
If you don't have a platform persistent store driver, If you don't have a platform persistent store driver,
say N. say N.
choice config PSTORE_DEFLATE_COMPRESS
prompt "Choose compression algorithm" tristate "DEFLATE (ZLIB) compression"
depends on PSTORE default y
default PSTORE_ZLIB_COMPRESS depends on PSTORE
help select CRYPTO_DEFLATE
This option chooses compression algorithm. help
This option enables DEFLATE (also known as ZLIB) compression
config PSTORE_ZLIB_COMPRESS algorithm support.
bool "ZLIB"
select ZLIB_DEFLATE
select ZLIB_INFLATE
help
This option enables ZLIB compression algorithm support.
config PSTORE_LZO_COMPRESS config PSTORE_LZO_COMPRESS
bool "LZO" tristate "LZO compression"
select LZO_COMPRESS depends on PSTORE
select LZO_DECOMPRESS select CRYPTO_LZO
help help
This option enables LZO compression algorithm support. This option enables LZO compression algorithm support.
config PSTORE_LZ4_COMPRESS config PSTORE_LZ4_COMPRESS
bool "LZ4" tristate "LZ4 compression"
select LZ4_COMPRESS depends on PSTORE
select LZ4_DECOMPRESS select CRYPTO_LZ4
help help
This option enables LZ4 compression algorithm support. This option enables LZ4 compression algorithm support.
config PSTORE_LZ4HC_COMPRESS
tristate "LZ4HC compression"
depends on PSTORE
select CRYPTO_LZ4HC
help
This option enables LZ4HC (high compression) mode algorithm.
config PSTORE_842_COMPRESS
bool "842 compression"
depends on PSTORE
select CRYPTO_842
help
This option enables 842 compression algorithm support.
config PSTORE_COMPRESS
def_bool y
depends on PSTORE
depends on PSTORE_DEFLATE_COMPRESS || PSTORE_LZO_COMPRESS || \
PSTORE_LZ4_COMPRESS || PSTORE_LZ4HC_COMPRESS || \
PSTORE_842_COMPRESS
choice
prompt "Default pstore compression algorithm"
depends on PSTORE_COMPRESS
help
This option chooses the default active compression algorithm.
This change be changed at boot with "pstore.compress=..." on
the kernel command line.
Currently, pstore has support for 5 compression algorithms:
deflate, lzo, lz4, lz4hc and 842.
The default compression algorithm is deflate.
config PSTORE_DEFLATE_COMPRESS_DEFAULT
bool "deflate" if PSTORE_DEFLATE_COMPRESS
config PSTORE_LZO_COMPRESS_DEFAULT
bool "lzo" if PSTORE_LZO_COMPRESS
config PSTORE_LZ4_COMPRESS_DEFAULT
bool "lz4" if PSTORE_LZ4_COMPRESS
config PSTORE_LZ4HC_COMPRESS_DEFAULT
bool "lz4hc" if PSTORE_LZ4HC_COMPRESS
config PSTORE_842_COMPRESS_DEFAULT
bool "842" if PSTORE_842_COMPRESS
endchoice endchoice
config PSTORE_COMPRESS_DEFAULT
string
depends on PSTORE_COMPRESS
default "deflate" if PSTORE_DEFLATE_COMPRESS_DEFAULT
default "lzo" if PSTORE_LZO_COMPRESS_DEFAULT
default "lz4" if PSTORE_LZ4_COMPRESS_DEFAULT
default "lz4hc" if PSTORE_LZ4HC_COMPRESS_DEFAULT
default "842" if PSTORE_842_COMPRESS_DEFAULT
config PSTORE_CONSOLE config PSTORE_CONSOLE
bool "Log kernel console messages" bool "Log kernel console messages"
depends on PSTORE depends on PSTORE

2
fs/pstore/inode.c
View File

@ -486,6 +486,8 @@ static int __init init_pstore_fs(void)
{ {
int err; int err;
pstore_choose_compression();
/* Create a convenient mount point for people to access pstore */ /* Create a convenient mount point for people to access pstore */
err = sysfs_create_mount_point(fs_kobj, "pstore"); err = sysfs_create_mount_point(fs_kobj, "pstore");
if (err) if (err)

3
fs/pstore/internal.h
View File

@ -37,4 +37,7 @@ extern bool pstore_is_mounted(void);
extern void pstore_record_init(struct pstore_record *record, extern void pstore_record_init(struct pstore_record *record,
struct pstore_info *psi); struct pstore_info *psi);
/* Called during module_init() */
extern void __init pstore_choose_compression(void);
#endif #endif

406
fs/pstore/platform.c
View File

@ -28,15 +28,13 @@
#include <linux/console.h> #include <linux/console.h>
#include <linux/module.h> #include <linux/module.h>
#include <linux/pstore.h> #include <linux/pstore.h>
#ifdef CONFIG_PSTORE_ZLIB_COMPRESS #if IS_ENABLED(CONFIG_PSTORE_LZO_COMPRESS)
#include <linux/zlib.h>
#endif
#ifdef CONFIG_PSTORE_LZO_COMPRESS
#include <linux/lzo.h> #include <linux/lzo.h>
#endif #endif
#ifdef CONFIG_PSTORE_LZ4_COMPRESS #if IS_ENABLED(CONFIG_PSTORE_LZ4_COMPRESS) || IS_ENABLED(CONFIG_PSTORE_LZ4HC_COMPRESS)
#include <linux/lz4.h> #include <linux/lz4.h>
#endif #endif
#include <linux/crypto.h>
#include <linux/string.h> #include <linux/string.h>
#include <linux/timer.h> #include <linux/timer.h>
#include <linux/slab.h> #include <linux/slab.h>
@ -74,23 +72,18 @@ static DEFINE_SPINLOCK(pstore_lock);
struct pstore_info *psinfo; struct pstore_info *psinfo;
static char *backend; static char *backend;
static char *compress =
/* Compression parameters */ #ifdef CONFIG_PSTORE_COMPRESS_DEFAULT
#ifdef CONFIG_PSTORE_ZLIB_COMPRESS CONFIG_PSTORE_COMPRESS_DEFAULT;
#define COMPR_LEVEL 6
#define WINDOW_BITS 12
#define MEM_LEVEL 4
static struct z_stream_s stream;
#else #else
static unsigned char *workspace; NULL;
#endif #endif
struct pstore_zbackend { /* Compression parameters */
int (*compress)(const void *in, void *out, size_t inlen, size_t outlen); static struct crypto_comp *tfm;
int (*decompress)(void *in, void *out, size_t inlen, size_t outlen);
void (*allocate)(void);
void (*free)(void);
struct pstore_zbackend {
int (*zbufsize)(size_t size);
const char *name; const char *name;
}; };
@ -149,77 +142,12 @@ bool pstore_cannot_block_path(enum kmsg_dump_reason reason)
} }
EXPORT_SYMBOL_GPL(pstore_cannot_block_path); EXPORT_SYMBOL_GPL(pstore_cannot_block_path);
#ifdef CONFIG_PSTORE_ZLIB_COMPRESS #if IS_ENABLED(CONFIG_PSTORE_DEFLATE_COMPRESS)
/* Derived from logfs_compress() */ static int zbufsize_deflate(size_t size)
static int compress_zlib(const void *in, void *out, size_t inlen, size_t outlen)
{ {
int err, ret;
ret = -EIO;
err = zlib_deflateInit2(&stream, COMPR_LEVEL, Z_DEFLATED, WINDOW_BITS,
MEM_LEVEL, Z_DEFAULT_STRATEGY);
if (err != Z_OK)
goto error;
stream.next_in = in;
stream.avail_in = inlen;
stream.total_in = 0;
stream.next_out = out;
stream.avail_out = outlen;
stream.total_out = 0;
err = zlib_deflate(&stream, Z_FINISH);
if (err != Z_STREAM_END)
goto error;
err = zlib_deflateEnd(&stream);
if (err != Z_OK)
goto error;
if (stream.total_out >= stream.total_in)
goto error;
ret = stream.total_out;
error:
return ret;
}
/* Derived from logfs_uncompress */
static int decompress_zlib(void *in, void *out, size_t inlen, size_t outlen)
{
int err, ret;
ret = -EIO;
err = zlib_inflateInit2(&stream, WINDOW_BITS);
if (err != Z_OK)
goto error;
stream.next_in = in;
stream.avail_in = inlen;
stream.total_in = 0;
stream.next_out = out;
stream.avail_out = outlen;
stream.total_out = 0;
err = zlib_inflate(&stream, Z_FINISH);
if (err != Z_STREAM_END)
goto error;
err = zlib_inflateEnd(&stream);
if (err != Z_OK)
goto error;
ret = stream.total_out;
error:
return ret;
}
static void allocate_zlib(void)
{
size_t size;
size_t cmpr; size_t cmpr;
switch (psinfo->bufsize) { switch (size) {
/* buffer range for efivars */ /* buffer range for efivars */
case 1000 ... 2000: case 1000 ... 2000:
cmpr = 56; cmpr = 56;
@ -239,212 +167,131 @@ static void allocate_zlib(void)
break; break;
} }
big_oops_buf_sz = (psinfo->bufsize * 100) / cmpr; return (size * 100) / cmpr;
big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
if (big_oops_buf) {
size = max(zlib_deflate_workspacesize(WINDOW_BITS, MEM_LEVEL),
zlib_inflate_workspacesize());
stream.workspace = kmalloc(size, GFP_KERNEL);
if (!stream.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");
stream.workspace = NULL;
}
} }
#endif
static void free_zlib(void) #if IS_ENABLED(CONFIG_PSTORE_LZO_COMPRESS)
static int zbufsize_lzo(size_t size)
{ {
kfree(stream.workspace); return lzo1x_worst_compress(size);
stream.workspace = NULL;
kfree(big_oops_buf);
big_oops_buf = NULL;
big_oops_buf_sz = 0;
} }
#endif
static const struct pstore_zbackend backend_zlib = { #if IS_ENABLED(CONFIG_PSTORE_LZ4_COMPRESS) || IS_ENABLED(CONFIG_PSTORE_LZ4HC_COMPRESS)
.compress = compress_zlib, static int zbufsize_lz4(size_t size)
.decompress = decompress_zlib, {
.allocate = allocate_zlib, return LZ4_compressBound(size);
.free = free_zlib, }
.name = "zlib", #endif
#if IS_ENABLED(CONFIG_PSTORE_842_COMPRESS)
static int zbufsize_842(size_t size)
{
return size;
}
#endif
static const struct pstore_zbackend *zbackend __ro_after_init;
static const struct pstore_zbackend zbackends[] = {
#if IS_ENABLED(CONFIG_PSTORE_DEFLATE_COMPRESS)
{
.zbufsize = zbufsize_deflate,
.name = "deflate",
},
#endif
#if IS_ENABLED(CONFIG_PSTORE_LZO_COMPRESS)
{
.zbufsize = zbufsize_lzo,
.name = "lzo",
},
#endif
#if IS_ENABLED(CONFIG_PSTORE_LZ4_COMPRESS)
{
.zbufsize = zbufsize_lz4,
.name = "lz4",
},
#endif
#if IS_ENABLED(CONFIG_PSTORE_LZ4HC_COMPRESS)
{
.zbufsize = zbufsize_lz4,
.name = "lz4hc",
},
#endif
#if IS_ENABLED(CONFIG_PSTORE_842_COMPRESS)
{
.zbufsize = zbufsize_842,
.name = "842",
},
#endif
{ }
}; };
#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 const 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_default(in, out, inlen, outlen, workspace);
if (!ret) {
pr_err("LZ4_compress_default error; compression failed!\n");
return -EIO;
}
return ret;
}
static int decompress_lz4(void *in, void *out, size_t inlen, size_t outlen)
{
int ret;
ret = LZ4_decompress_safe(in, out, inlen, outlen);
if (ret < 0) {
/*
* LZ4_decompress_safe will return an error code
* (< 0) if decompression failed
*/
pr_err("LZ4_decompress_safe error, ret = %d!\n", ret);
return -EIO;
}
return ret;
}
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 const struct pstore_zbackend backend_lz4 = {
.compress = compress_lz4,
.decompress = decompress_lz4,
.allocate = allocate_lz4,
.free = free_lz4,
.name = "lz4",
};
#endif
static const 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, static int pstore_compress(const void *in, void *out,
size_t inlen, size_t outlen) unsigned int inlen, unsigned int outlen)
{ {
if (zbackend) int ret;
return zbackend->compress(in, out, inlen, outlen);
else ret = crypto_comp_compress(tfm, in, inlen, out, &outlen);
return -EIO; if (ret) {
pr_err("crypto_comp_compress failed, ret = %d!\n", ret);
return ret;
}
return outlen;
} }
static int pstore_decompress(void *in, void *out, size_t inlen, size_t outlen) static int pstore_decompress(void *in, void *out,
unsigned int inlen, unsigned int outlen)
{ {
if (zbackend) int ret;
return zbackend->decompress(in, out, inlen, outlen);
else ret = crypto_comp_decompress(tfm, in, inlen, out, &outlen);
return -EIO; if (ret) {
pr_err("crypto_comp_decompress failed, ret = %d!\n", ret);
return ret;
}
return outlen;
} }
static void allocate_buf_for_compression(void) static void allocate_buf_for_compression(void)
{ {
if (zbackend) { if (!zbackend)
pr_info("using %s compression\n", zbackend->name); return;
zbackend->allocate();
} else { if (!crypto_has_comp(zbackend->name, 0, 0)) {
pr_err("No %s compression\n", zbackend->name);
return;
}
big_oops_buf_sz = zbackend->zbufsize(psinfo->bufsize);
if (big_oops_buf_sz <= 0)
return;
big_oops_buf = kmalloc(big_oops_buf_sz, GFP_KERNEL);
if (!big_oops_buf) {
pr_err("allocate compression buffer error!\n"); pr_err("allocate compression buffer error!\n");
return;
}
tfm = crypto_alloc_comp(zbackend->name, 0, 0);
if (IS_ERR_OR_NULL(tfm)) {
kfree(big_oops_buf);
big_oops_buf = NULL;
pr_err("crypto_alloc_comp() failed!\n");
return;
} }
} }
static void free_buf_for_compression(void) static void free_buf_for_compression(void)
{ {
if (zbackend) if (!IS_ERR_OR_NULL(tfm))
zbackend->free(); crypto_free_comp(tfm);
else kfree(big_oops_buf);
pr_err("free compression buffer error!\n"); big_oops_buf = NULL;
big_oops_buf_sz = 0;
} }
/* /*
@ -901,5 +748,24 @@ static void pstore_timefunc(struct timer_list *unused)
jiffies + msecs_to_jiffies(pstore_update_ms)); jiffies + msecs_to_jiffies(pstore_update_ms));
} }
void __init pstore_choose_compression(void)
{
const struct pstore_zbackend *step;
if (!compress)
return;
for (step = zbackends; step->name; step++) {
if (!strcmp(compress, step->name)) {
zbackend = step;
pr_info("using %s compression\n", zbackend->name);
return;
}
}
}
module_param(compress, charp, 0444);
MODULE_PARM_DESC(compress, "Pstore compression to use");
module_param(backend, charp, 0444); module_param(backend, charp, 0444);
MODULE_PARM_DESC(backend, "Pstore backend to use"); MODULE_PARM_DESC(backend, "Pstore backend to use");

2
fs/pstore/ram.c
View File

@ -938,7 +938,7 @@ static int __init ramoops_init(void)
ramoops_register_dummy(); ramoops_register_dummy();
return platform_driver_register(&ramoops_driver); return platform_driver_register(&ramoops_driver);
} }
postcore_initcall(ramoops_init); late_initcall(ramoops_init);
static void __exit ramoops_exit(void) static void __exit ramoops_exit(void)
{ {

29
fs/pstore/ram_core.c
View File

@ -98,24 +98,23 @@ static void notrace persistent_ram_encode_rs8(struct persistent_ram_zone *prz,
uint8_t *data, size_t len, uint8_t *ecc) uint8_t *data, size_t len, uint8_t *ecc)
{ {
int i; int i;
uint16_t par[prz->ecc_info.ecc_size];
/* Initialize the parity buffer */ /* Initialize the parity buffer */
memset(par, 0, sizeof(par)); memset(prz->ecc_info.par, 0,
encode_rs8(prz->rs_decoder, data, len, par, 0); prz->ecc_info.ecc_size * sizeof(prz->ecc_info.par[0]));
encode_rs8(prz->rs_decoder, data, len, prz->ecc_info.par, 0);
for (i = 0; i < prz->ecc_info.ecc_size; i++) for (i = 0; i < prz->ecc_info.ecc_size; i++)
ecc[i] = par[i]; ecc[i] = prz->ecc_info.par[i];
} }
static int persistent_ram_decode_rs8(struct persistent_ram_zone *prz, static int persistent_ram_decode_rs8(struct persistent_ram_zone *prz,
void *data, size_t len, uint8_t *ecc) void *data, size_t len, uint8_t *ecc)
{ {
int i; int i;
uint16_t par[prz->ecc_info.ecc_size];
for (i = 0; i < prz->ecc_info.ecc_size; i++) for (i = 0; i < prz->ecc_info.ecc_size; i++)
par[i] = ecc[i]; prz->ecc_info.par[i] = ecc[i];
return decode_rs8(prz->rs_decoder, data, par, len, return decode_rs8(prz->rs_decoder, data, prz->ecc_info.par, len,
NULL, 0, NULL, 0, NULL); NULL, 0, NULL, 0, NULL);
} }
@ -228,6 +227,15 @@ static int persistent_ram_init_ecc(struct persistent_ram_zone *prz,
return -EINVAL; return -EINVAL;
} }
/* allocate workspace instead of using stack VLA */
prz->ecc_info.par = kmalloc_array(prz->ecc_info.ecc_size,
sizeof(*prz->ecc_info.par),
GFP_KERNEL);
if (!prz->ecc_info.par) {
pr_err("cannot allocate ECC parity workspace\n");
return -ENOMEM;
}
prz->corrected_bytes = 0; prz->corrected_bytes = 0;
prz->bad_blocks = 0; prz->bad_blocks = 0;
@ -514,6 +522,13 @@ void persistent_ram_free(struct persistent_ram_zone *prz)
} }
prz->vaddr = NULL; prz->vaddr = NULL;
} }
if (prz->rs_decoder) {
free_rs(prz->rs_decoder);
prz->rs_decoder = NULL;
}
kfree(prz->ecc_info.par);
prz->ecc_info.par = NULL;
persistent_ram_free_old(prz); persistent_ram_free_old(prz);
kfree(prz); kfree(prz);
} }

1
include/linux/pstore_ram.h
View File

@ -39,6 +39,7 @@ struct persistent_ram_ecc_info {
int ecc_size; int ecc_size;
int symsize; int symsize;
int poly; int poly;
uint16_t *par;
}; };
struct persistent_ram_zone { struct persistent_ram_zone {