linux-kernel - [PATCH] printk: Warn about dropped messages also on extended consoles

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1438255732-31326-1-git-send-email-pmladek@suse.com>
Date:	Thu, 30 Jul 2015 13:28:52 +0200
From:	Petr Mladek <pmladek@...e.com>
To:	akpm@...ux-foundation.org, Tejun Heo <tj@...nel.org>
Cc:	davem@...emloft.net, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org, Petr Mladek <pmladek@...e.com>
Subject: [PATCH] printk: Warn about dropped messages also on extended consoles

The commit #6fe29354befe4c ("printk: implement support for extended console
drivers") added an extra buffer to format messages for extended consoles.
We need to put there also the warning about dropped messages, so it appears
on these consoles.

Signed-off-by: Petr Mladek <pmladek@...e.com>
---
 kernel/printk/printk.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index cf8c24203368..77d3d3698283 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2254,8 +2254,15 @@ again:
 		}
 
 		if (console_seq < log_first_seq) {
-			len = sprintf(text, "** %u printk messages dropped ** ",
-				      (unsigned)(log_first_seq - console_seq));
+			static const char dropped_msg[] =
+				"** %u printk messages dropped ** ";
+			unsigned int dropped_count =
+				(unsigned int)(log_first_seq - console_seq);
+
+			len = sprintf(text, dropped_msg, dropped_count);
+			if (nr_ext_console_drivers)
+				ext_len = sprintf(ext_text, dropped_msg,
+						  dropped_count);
 
 			/* messages are gone, move to first one */
 			console_seq = log_first_seq;
@@ -2290,8 +2297,8 @@ skip:
 		len += msg_print_text(msg, console_prev, false,
 				      text + len, sizeof(text) - len);
 		if (nr_ext_console_drivers) {
-			ext_len = msg_print_ext_header(ext_text,
-						sizeof(ext_text),
+			ext_len += msg_print_ext_header(ext_text + ext_len,
+						sizeof(ext_text) - ext_len,
 						msg, console_seq, console_prev);
 			ext_len += msg_print_ext_body(ext_text + ext_len,
 						sizeof(ext_text) - ext_len,
-- 
1.8.5.6

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/