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Commit b0d2374d authored by Anton Altaparmakov's avatar Anton Altaparmakov
Browse files

NTFS: Some utilities modify the boot sector but do not update the checksum. 


      Thus, relax the checking in fs/ntfs/super.c::is_boot_sector_ntfs() to
      only emit a warning when the checksum is incorrect rather than
      refusing the mount.  Thanks to Bernd Casimir for pointing this
      problem out.

Signed-off-by: default avatarAnton Altaparmakov <aia21@cantab.net>
parent 251c8427

fs/ntfs/ChangeLog

+5 −0
Original line number Diff line number Diff line
@@ -105,6 +105,11 @@ ToDo/Notes: 
	  non-resident by a concurrent file write.

	- Remove checks for NULL before calling kfree() since kfree() does the

	  checking itself.  (Jesper Juhl)

	- Some utilities modify the boot sector but do not update the checksum.

	  Thus, relax the checking in fs/ntfs/super.c::is_boot_sector_ntfs() to

	  only emit a warning when the checksum is incorrect rather than

	  refusing the mount.  Thanks to Bernd Casimir for pointing this

	  problem out.



2.1.22 - Many bug and race fixes and error handling improvements.

fs/ntfs/super.c

+8 −4
Original line number Diff line number Diff line
@@ -38,6 +38,7 @@ 
#include "debug.h"

#include "index.h"

#include "aops.h"

#include "layout.h"

#include "malloc.h"

#include "ntfs.h"
@@ -532,16 +533,19 @@ static BOOL is_boot_sector_ntfs(const struct super_block *sb, 
{

	/*

	 * Check that checksum == sum of u32 values from b to the checksum

	 * field. If checksum is zero, no checking is done.

	 * field.  If checksum is zero, no checking is done.  We will work when

	 * the checksum test fails, since some utilities update the boot sector

	 * ignoring the checksum which leaves the checksum out-of-date.  We

	 * report a warning if this is the case.

	 */

	if ((void*)b < (void*)&b->checksum && b->checksum) {

	if ((void*)b < (void*)&b->checksum && b->checksum && !silent) {

		le32 *u;

		u32 i;



		for (i = 0, u = (le32*)b; u < (le32*)(&b->checksum); ++u)

			i += le32_to_cpup(u);

		if (le32_to_cpu(b->checksum) != i)

			goto not_ntfs;

			ntfs_warning(sb, "Invalid boot sector checksum.");

	}

	/* Check OEMidentifier is "NTFS    " */

	if (b->oem_id != magicNTFS)
@@ -591,7 +595,7 @@ static BOOL is_boot_sector_ntfs(const struct super_block *sb, 
	 * many BIOSes will refuse to boot from a bootsector if the magic is

	 * incorrect, so we emit a warning.

	 */

	if (!silent && b->end_of_sector_marker != cpu_to_le16(0xaa55))

	if (!silent && b->end_of_sector_marker != const_cpu_to_le16(0xaa55))

		ntfs_warning(sb, "Invalid end of sector marker.");

	return TRUE;

not_ntfs: