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dc74eaad8c
The message buffer used by cmn_err() is only 256 bytes and some CXFS messages were exceeding this length. Since we were using vsprintf() and not checking for buffer overruns we were clobbering memory beyond the buffer. The size of the buffer has been increased to 1024 bytes so we can capture these larger messages and we are now using vsnprintf() to prevent overrunning the buffer size. SGI-PV: 958599 SGI-Modid: xfs-linux-melb:xfs-kern:27561a Signed-off-by: Lachlan McIlroy <lachlan@sgi.com> Signed-off-by: Geoffrey Wehrman <gwehrman@sgi.com> Signed-off-by: Tim Shimmin <tes@sgi.com>
101 lines
2.8 KiB
C
101 lines
2.8 KiB
C
/*
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* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <xfs.h>
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#include "debug.h"
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#include "spin.h"
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static char message[1024]; /* keep it off the stack */
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static DEFINE_SPINLOCK(xfs_err_lock);
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/* Translate from CE_FOO to KERN_FOO, err_level(CE_FOO) == KERN_FOO */
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#define XFS_MAX_ERR_LEVEL 7
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#define XFS_ERR_MASK ((1 << 3) - 1)
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static const char * const err_level[XFS_MAX_ERR_LEVEL+1] =
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{KERN_EMERG, KERN_ALERT, KERN_CRIT,
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KERN_ERR, KERN_WARNING, KERN_NOTICE,
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KERN_INFO, KERN_DEBUG};
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void
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cmn_err(register int level, char *fmt, ...)
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{
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char *fp = fmt;
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int len;
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ulong flags;
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va_list ap;
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level &= XFS_ERR_MASK;
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if (level > XFS_MAX_ERR_LEVEL)
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level = XFS_MAX_ERR_LEVEL;
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spin_lock_irqsave(&xfs_err_lock,flags);
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va_start(ap, fmt);
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if (*fmt == '!') fp++;
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len = vsnprintf(message, sizeof(message), fp, ap);
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if (len >= sizeof(message))
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len = sizeof(message) - 1;
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if (message[len-1] == '\n')
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message[len-1] = 0;
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printk("%s%s\n", err_level[level], message);
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va_end(ap);
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spin_unlock_irqrestore(&xfs_err_lock,flags);
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BUG_ON(level == CE_PANIC);
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}
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void
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icmn_err(register int level, char *fmt, va_list ap)
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{
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ulong flags;
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int len;
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level &= XFS_ERR_MASK;
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if(level > XFS_MAX_ERR_LEVEL)
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level = XFS_MAX_ERR_LEVEL;
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spin_lock_irqsave(&xfs_err_lock,flags);
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len = vsnprintf(message, sizeof(message), fmt, ap);
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if (len >= sizeof(message))
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len = sizeof(message) - 1;
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if (message[len-1] == '\n')
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message[len-1] = 0;
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printk("%s%s\n", err_level[level], message);
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spin_unlock_irqrestore(&xfs_err_lock,flags);
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BUG_ON(level == CE_PANIC);
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}
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void
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assfail(char *expr, char *file, int line)
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{
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printk("Assertion failed: %s, file: %s, line: %d\n", expr, file, line);
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BUG();
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}
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#if ((defined(DEBUG) || defined(INDUCE_IO_ERRROR)) && !defined(NO_WANT_RANDOM))
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unsigned long random(void)
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{
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static unsigned long RandomValue = 1;
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/* cycles pseudo-randomly through all values between 1 and 2^31 - 2 */
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register long rv = RandomValue;
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register long lo;
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register long hi;
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hi = rv / 127773;
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lo = rv % 127773;
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rv = 16807 * lo - 2836 * hi;
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if (rv <= 0) rv += 2147483647;
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return RandomValue = rv;
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}
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#endif /* DEBUG || INDUCE_IO_ERRROR || !NO_WANT_RANDOM */
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