linux-kernel - [tip:urgent] fix kfifo_out

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

Date:	Tue, 05 Jan 2010 14:38:35 +0100
From:	Stefani Seibold <stefani@...bold.net>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>
Subject: [tip:urgent] fix kfifo_out_locked race bug

This patch fix a wrong optimization in include/linux/kfifo.h which could
cause a race in kfifo_out_locked.

Please apply it to the 2.6.33-rc* tree.

Signed-off-by: Stefani Seibold <stefani@...bold.net>
---
 kfifo.h |    7 -------
 1 file changed, 7 deletions(-)

--- linux-2.6.33-rc2.orig/include/linux/kfifo.h	2009-12-27
23:37:04.921185257 +0100
+++ kfifo.h	2010-01-05 14:32:31.414316321 +0100
@@ -228,13 +228,6 @@ static inline __must_check unsigned int 
 
 	ret = kfifo_out(fifo, to, n);
 
-	/*
-	 * optimization: if the FIFO is empty, set the indices to 0
-	 * so we don't wrap the next time
-	 */
-	if (kfifo_is_empty(fifo))
-		kfifo_reset(fifo);
-
 	spin_unlock_irqrestore(lock, flags);
 
 	return ret;


--
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/