[ALSA - tools 0001343]: bitops not 64bit clean

[bugtrack@alsa-project.org]

The following issue has been SUBMITTED.
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<https://bugtrack.alsa-project.org/alsa-bug/view.php?id=1343> 
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Reported By:                jdthood
Assigned To:                
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Project:                    ALSA - tools
Issue ID:                   1343
Category:                   ld10k1
Reproducibility:            always
Severity:                   major
Priority:                   normal
Status:                     new
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Date Submitted:             08-16-2005 20:49 CEST
Last Modified:              08-16-2005 20:49 CEST
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Summary:                    bitops not 64bit clean
Description: 
Quoting Debian bug report #323331:

Package: ld10k1
Version: 1.0.9-1

On all 64bit systems (the easiest example is amd64) ld10k1 crashes on
use by lo10k1, some debugging tracked down the problem fairly quickly.

The bitops functions (set_bit and associated) that ld10k1 use come from
the linux kernel, and assume that longs are 32bit only, causing a buffer
overflow of the bit buffer.

The attached patch fixes the bitops to be independent of the size of
longs, and is confirmed to fix the bug on my box.

Zephaniah E. Hull.

diff -ur alsa-tools-1.0.9/ld10k1/src/bitops.h
alsa-tools-1.0.9.mine/ld10k1/src/bitops.h
--- alsa-tools-1.0.9/ld10k1/src/bitops.h	2005-03-18 08:41:02.000000000
-0500
+++ alsa-tools-1.0.9.mine/ld10k1/src/bitops.h	2005-08-15
23:24:46.000000000 -0400
@@ -15,13 +15,17 @@
  * 
  * C language equivalents written by Theodore Ts'o, 9/26/92
  */
+/*
+ * Converted to be independent of the size of longs.
+ * Zephaniah E. Hull 2005-08-15.
+ */
 
 __inline__ int set_bit(int nr, unsigned long * addr)
 {
 	int	mask, retval;
 
-	addr += nr >> 5;
-	mask = 1 << (nr & 0x1f);
+	addr += nr >> (sizeof(long) + 1);
+	mask = 1 << (nr & (sizeof(long) * 8 - 1));
 	retval = (mask & *addr) != 0;
 	*addr |= mask;
 	return retval;
@@ -31,8 +35,8 @@
 {
 	int	mask, retval;
 
-	addr += nr >> 5;
-	mask = 1 << (nr & 0x1f);
+	addr += nr >> (sizeof(long) + 1);
+	mask = 1 << (nr & (sizeof(long) * 8 - 1));
 	retval = (mask & *addr) != 0;
 	*addr &= ~mask;
 	return retval;
@@ -42,8 +46,8 @@
 {
 	int	mask;
 
-	addr += nr >> 5;
-	mask = 1 << (nr & 0x1f);
+	addr += nr >> (sizeof(long) + 1);
+	mask = 1 << (nr & (sizeof(long) * 8 - 1));
 	return ((mask & *addr) != 0);
 }

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Issue History
Date Modified  Username       Field                    Change              
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08-16-05 20:49 jdthood        New Issue                                    
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