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pstore: fix crypto dependencies
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The new crypto API use causes some problems with Kconfig dependencies,
including this link error:

fs/pstore/platform.o: In function `pstore_register':
platform.c:(.text+0x248): undefined reference to `crypto_has_alg'
platform.c:(.text+0x2a0): undefined reference to `crypto_alloc_base'
fs/pstore/platform.o: In function `pstore_unregister':
platform.c:(.text+0x498): undefined reference to `crypto_destroy_tfm'
crypto/lz4hc.o: In function `lz4hc_sdecompress':
lz4hc.c:(.text+0x1a): undefined reference to `LZ4_decompress_safe'
crypto/lz4hc.o: In function `lz4hc_decompress_crypto':
lz4hc.c:(.text+0x5a): undefined reference to `LZ4_decompress_safe'
crypto/lz4hc.o: In function `lz4hc_scompress':
lz4hc.c:(.text+0xaa): undefined reference to `LZ4_compress_HC'
crypto/lz4hc.o: In function `lz4hc_mod_init':
lz4hc.c:(.init.text+0xf): undefined reference to `crypto_register_alg'
lz4hc.c:(.init.text+0x1f): undefined reference to `crypto_register_scomp'
lz4hc.c:(.init.text+0x2f): undefined reference to `crypto_unregister_alg'

The problem is that with CONFIG_CRYPTO=m, we must not 'select CRYPTO_LZ4'
from a bool symbol, or call crypto API functions from a built-in
module.

This turns the sub-options into 'tristate' ones so the dependencies
are honored, and makes the pstore itself select the crypto core
if necessary.

Fixes: cb3bee0 ("pstore: Use crypto compress API")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Kees Cook <keescook@chromium.org>
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Arnd Bergmann authored and Kees Cook committed Mar 15, 2018
1 parent cb3bee0 commit 58eb5b6
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Showing 2 changed files with 21 additions and 20 deletions.
19 changes: 10 additions & 9 deletions fs/pstore/Kconfig
View file
Original file line number Diff line number Diff line change
@@ -1,5 +1,6 @@
config PSTORE
tristate "Persistent store support"
select CRYPTO if PSTORE_COMPRESS
default n
help
This option enables generic access to platform level
Expand All @@ -13,7 +14,7 @@ config PSTORE
say N.

config PSTORE_DEFLATE_COMPRESS
bool "DEFLATE (ZLIB) compression"
tristate "DEFLATE (ZLIB) compression"
default y
depends on PSTORE
select CRYPTO_DEFLATE
Expand All @@ -22,21 +23,21 @@ config PSTORE_DEFLATE_COMPRESS
algorithm support.

config PSTORE_LZO_COMPRESS
bool "LZO compression"
tristate "LZO compression"
depends on PSTORE
select CRYPTO_LZO
help
This option enables LZO compression algorithm support.

config PSTORE_LZ4_COMPRESS
bool "LZ4 compression"
tristate "LZ4 compression"
depends on PSTORE
select CRYPTO_LZ4
help
This option enables LZ4 compression algorithm support.

config PSTORE_LZ4HC_COMPRESS
bool "LZ4HC compression"
tristate "LZ4HC compression"
depends on PSTORE
select CRYPTO_LZ4HC
help
Expand Down Expand Up @@ -70,19 +71,19 @@ choice
The default compression algorithm is deflate.

config PSTORE_DEFLATE_COMPRESS_DEFAULT
bool "deflate" if PSTORE_DEFLATE_COMPRESS=y
bool "deflate" if PSTORE_DEFLATE_COMPRESS

config PSTORE_LZO_COMPRESS_DEFAULT
bool "lzo" if PSTORE_LZO_COMPRESS=y
bool "lzo" if PSTORE_LZO_COMPRESS

config PSTORE_LZ4_COMPRESS_DEFAULT
bool "lz4" if PSTORE_LZ4_COMPRESS=y
bool "lz4" if PSTORE_LZ4_COMPRESS

config PSTORE_LZ4HC_COMPRESS_DEFAULT
bool "lz4hc" if PSTORE_LZ4HC_COMPRESS=y
bool "lz4hc" if PSTORE_LZ4HC_COMPRESS

config PSTORE_842_COMPRESS_DEFAULT
bool "842" if PSTORE_842_COMPRESS=y
bool "842" if PSTORE_842_COMPRESS

endchoice

Expand Down
22 changes: 11 additions & 11 deletions fs/pstore/platform.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -28,10 +28,10 @@
#include <linux/console.h>
#include <linux/module.h>
#include <linux/pstore.h>
#ifdef CONFIG_PSTORE_LZO_COMPRESS
#if IS_ENABLED(CONFIG_PSTORE_LZO_COMPRESS)
#include <linux/lzo.h>
#endif
#if defined(CONFIG_PSTORE_LZ4_COMPRESS) || defined(CONFIG_PSTORE_LZ4HC_COMPRESS)
#if IS_ENABLED(CONFIG_PSTORE_LZ4_COMPRESS) || IS_ENABLED(CONFIG_PSTORE_LZ4HC_COMPRESS)
#include <linux/lz4.h>
#endif
#include <linux/crypto.h>
Expand Down Expand Up @@ -142,7 +142,7 @@ bool pstore_cannot_block_path(enum kmsg_dump_reason reason)
}
EXPORT_SYMBOL_GPL(pstore_cannot_block_path);

#ifdef CONFIG_PSTORE_DEFLATE_COMPRESS
#if IS_ENABLED(CONFIG_PSTORE_DEFLATE_COMPRESS)
static int zbufsize_deflate(size_t size)
{
size_t cmpr;
Expand Down Expand Up @@ -171,21 +171,21 @@ static int zbufsize_deflate(size_t size)
}
#endif

#ifdef CONFIG_PSTORE_LZO_COMPRESS
#if IS_ENABLED(CONFIG_PSTORE_LZO_COMPRESS)
static int zbufsize_lzo(size_t size)
{
return lzo1x_worst_compress(size);
}
#endif

#if defined(CONFIG_PSTORE_LZ4_COMPRESS) || defined(CONFIG_PSTORE_LZ4HC_COMPRESS)
#if IS_ENABLED(CONFIG_PSTORE_LZ4_COMPRESS) || IS_ENABLED(CONFIG_PSTORE_LZ4HC_COMPRESS)
static int zbufsize_lz4(size_t size)
{
return LZ4_compressBound(size);
}
#endif

#ifdef CONFIG_PSTORE_842_COMPRESS
#if IS_ENABLED(CONFIG_PSTORE_842_COMPRESS)
static int zbufsize_842(size_t size)
{
return size;
Expand All @@ -195,31 +195,31 @@ static int zbufsize_842(size_t size)
static const struct pstore_zbackend *zbackend __ro_after_init;

static const struct pstore_zbackend zbackends[] = {
#ifdef CONFIG_PSTORE_DEFLATE_COMPRESS
#if IS_ENABLED(CONFIG_PSTORE_DEFLATE_COMPRESS)
{
.zbufsize = zbufsize_deflate,
.name = "deflate",
},
#endif
#ifdef CONFIG_PSTORE_LZO_COMPRESS
#if IS_ENABLED(CONFIG_PSTORE_LZO_COMPRESS)
{
.zbufsize = zbufsize_lzo,
.name = "lzo",
},
#endif
#ifdef CONFIG_PSTORE_LZ4_COMPRESS
#if IS_ENABLED(CONFIG_PSTORE_LZ4_COMPRESS)
{
.zbufsize = zbufsize_lz4,
.name = "lz4",
},
#endif
#ifdef CONFIG_PSTORE_LZ4HC_COMPRESS
#if IS_ENABLED(CONFIG_PSTORE_LZ4HC_COMPRESS)
{
.zbufsize = zbufsize_lz4,
.name = "lz4hc",
},
#endif
#ifdef CONFIG_PSTORE_842_COMPRESS
#if IS_ENABLED(CONFIG_PSTORE_842_COMPRESS)
{
.zbufsize = zbufsize_842,
.name = "842",
Expand Down

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