diff options
| author | Tejun Heo <tj@kernel.org> | 2015-06-26 01:01:24 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-26 03:00:38 +0300 |
| commit | d43ff430f434d862db59582c0f1f02382a678036 (patch) | |
| tree | 1ade66d9cce26fc358a3d814bec1ad7bb06ec8cc /include | |
| parent | 4ae555a5313a302d36e34b3273545e4088c37cce (diff) | |
| download | linux-d43ff430f434d862db59582c0f1f02382a678036.tar.xz | |
printk: guard the amount written per line by devkmsg_read()
This patchset updates netconsole so that it can emit messages with the
same header as used in /dev/kmsg which gives neconsole receiver full log
information which enables things like structured logging and detection
of lost messages.
This patch (of 7):
devkmsg_read() uses 8k buffer and assumes that the formatted output
message won't overrun which seems safe given LOG_LINE_MAX, the current use
of dict and the escaping method being used; however, we're planning to use
devkmsg formatting wider and accounting for the buffer size properly isn't
that complicated.
This patch defines CONSOLE_EXT_LOG_MAX as 8192 and updates devkmsg_read()
so that it limits output accordingly.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: David Miller <davem@davemloft.net>
Cc: Kay Sievers <kay@vrfy.org>
Reviewed-by: Petr Mladek <pmladek@suse.cz>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/printk.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/printk.h b/include/linux/printk.h index 9b30871c9149..58b1fec40d37 100644 --- a/include/linux/printk.h +++ b/include/linux/printk.h @@ -30,6 +30,8 @@ static inline const char *printk_skip_level(const char *buffer) return buffer; } +#define CONSOLE_EXT_LOG_MAX 8192 + /* printk's without a loglevel use this.. */ #define MESSAGE_LOGLEVEL_DEFAULT CONFIG_MESSAGE_LOGLEVEL_DEFAULT |