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pstore: Move kmsg_bytes default into Kconfig 

While kmsg_bytes can be set for pstore via mount, if a crash occurs
before the mount only partial console log will be stored as kmsg_bytes
defaults to a potentially different hardcoded value in the kernel
(PSTORE_DEFAULT_KMSG_BYTES). This makes it impossible to analyze valuable
post-mortem data especially on the embedded development or in the process
of bringing up new boards. Change this value to be a Kconfig option
with the default of old PSTORE_DEFAULT_KMSG_BYTES

Signed-off-by: Vasile-Laurentiu Stanimir <vasile-laurentiu.stanimir@windriver.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Vasile-Laurentiu Stanimir 2020-11-04 15:05:32 +02:00 committed by Kees Cook
parent b6f8ed33ab
commit 26fecbf760
4 changed files with 10 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
fs/pstore/Kconfig
View File

@ -14,6 +14,14 @@ config PSTORE
If you don't have a platform persistent store driver,
say N.
config PSTORE_DEFAULT_KMSG_BYTES
int "Default kernel log storage space" if EXPERT
depends on PSTORE
default "10240"
help
Defines default size of pstore kernel log storage.
Can be enlarged if needed, not recommended to shrink it.
config PSTORE_DEFLATE_COMPRESS
tristate "DEFLATE (ZLIB) compression"
default y

2
fs/pstore/inode.c
View File

@ -266,7 +266,7 @@ static void parse_options(char *options)
*/
static int pstore_show_options(struct seq_file *m, struct dentry *root)
{
if (kmsg_bytes != PSTORE_DEFAULT_KMSG_BYTES)
if (kmsg_bytes != CONFIG_PSTORE_DEFAULT_KMSG_BYTES)
seq_printf(m, ",kmsg_bytes=%lu", kmsg_bytes);
return 0;
}

1
fs/pstore/internal.h
View File

@ -6,7 +6,6 @@
#include <linux/time.h>
#include <linux/pstore.h>
#define PSTORE_DEFAULT_KMSG_BYTES 10240
extern unsigned long kmsg_bytes;
#ifdef CONFIG_PSTORE_FTRACE

2
fs/pstore/platform.c
View File

@ -101,7 +101,7 @@ static char *big_oops_buf;
static size_t big_oops_buf_sz;
/* How much of the console log to snapshot */
unsigned long kmsg_bytes = PSTORE_DEFAULT_KMSG_BYTES;
unsigned long kmsg_bytes = CONFIG_PSTORE_DEFAULT_KMSG_BYTES;
void pstore_set_kmsg_bytes(int bytes)
{