Re: Bug


From: Stanislav Ievlev <inger@linux.ru.net>
Subject: Re: Bug
Date: Fri, 27 Apr 2001 17:38:20 +0400

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Stanislav Ievlev wrote:

> Hello Amon!
> 
> There is  bug in RSBAC. File /proc/rsbac-info and syscall 
> rsbac_syslog() works in non-blocked mode. Therefore, rsbac syslog 
> (rklogd) go to infinity loop and use 99% of CPU.

I think you forget to include some functions to rsbac_log(). Please see 
patch in attach

> 
> -----------------
> With best regards
> Stanislav Ievlev
> <inger@linux.ru.net>
> 
> 
> -
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> 
> 



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 name="rsbac-log.patch"
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 filename="rsbac-log.patch"

--- debug.c.orig	Fri Mar 23 17:49:03 2001
+++ debug.c	Fri Apr 27 17:15:24 2001
@@ -24,6 +24,10 @@
 #include <linux/module.h>
 #include <linux/console.h>
 
+/*new*/
+spinlock_t rsbac_log_lock = SPIN_LOCK_UNLOCKED;
+/*new*/
+
 /* Boolean debug switch for data structures */
 int  rsbac_debug_ds = 0;
 
@@ -620,6 +624,7 @@
 		error = verify_area(VERIFY_WRITE,buf,len);
 		if (error)
 			goto out;
+
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,3,0)
 		cli();
 		error = -ERESTARTSYS;
@@ -644,15 +649,22 @@
 		}
 		sti();
 #else
+		error=wait_event_interruptible(rlog_wait,rlog_size);
+		if (error)
+		    goto out;
 		i = 0;
+		spin_lock_irq(&rsbac_log_lock);
 		while (rlog_size && i < len) {
 			c = rlog_buf[log_start & RLOG_BUF_MASK];
 			log_start++;
 			rlog_size--;
+			spin_unlock_irq(&rsbac_log_lock);
 			__put_user(c,buf);
 			buf++;
 			i++;
+			spin_lock_irq(&rsbac_log_lock); 
 		}
+		spin_unlock_irq(&rsbac_log_lock);
 #endif
 		error = i;
 		break;

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