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authorTejun Heo <tj@kernel.org>2015-06-26 01:01:24 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2015-06-26 03:00:38 +0300
commitd43ff430f434d862db59582c0f1f02382a678036 (patch)
tree1ade66d9cce26fc358a3d814bec1ad7bb06ec8cc /include/linux/printk.h
parent4ae555a5313a302d36e34b3273545e4088c37cce (diff)
downloadlinux-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/linux/printk.h')
-rw-r--r--include/linux/printk.h2
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