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e2fsprogs/lib/ext2fs/dupfs.c

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Many files: Checkin of e2fsprogs 1.10
1997-04-30 01:26:48 +04:00
/*
* dupfs.c --- duplicate a ext2 filesystem handle
Remove trailing whitespace for the entire source tree Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2008-08-28 07:07:54 +04:00
*
dupfs.c (ext2fs_dup_handle): Make sure the new filesystem handle has its own copy of the orig_super data structure. (This is a better way of fixing a double-free problem in resize2fs which Fedora attempted to fix in e2fsprogs-1.35-double_free.patch. Addresses Red Hat Bugzilla #132707.)
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* Copyright (C) 1997, 1998, 2001, 2003, 2005 by Theodore Ts'o.
Many files: Checkin of e2fsprogs 1.10
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*
* %Begin-Header%
libe2p, libext2fs: Update file copyright permission states to match COPYING The top-level COPYING file states that the e2p and ext2fs libraries are available under the LGPLv2. The files were incorrectly labelled. Alex Thomas/Luster has been consulted wrt to the ext3_extents.h file; the rest of the files were primarily authored by Theodore Ts'o. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2010-05-18 05:31:56 +04:00
* This file may be redistributed under the terms of the GNU Library
* General Public License, version 2.
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* %End-Header%
*/
Shorten compile commands run by the build system The DEFS line in MCONFIG had gotten so long that it exceeded 4k, and this was starting to cause some tools heartburn. It also made "make V=1" almost useless, since trying to following the individual commands run by make was lost in the noise of all of the defines. So fix this by putting the configure-generated defines in lib/config.h and the directory pathnames to lib/dirpaths.h. In addition, clean up some vestigal defines in configure.in and in the Makefiles to further shorten the cc command lines. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-09-19 01:34:37 +04:00
#include "config.h"
Many files: Checkin of e2fsprogs 1.10
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#include <stdio.h>
Many files: block.c (ext2fs_block_iterate2): Use retval which is a errcode_t type. bitmaps.c (make_bitmap): Use size_t instead of int where appropriate. bb_inode.c (set_bad_block_proc): Add #pragma argsused for Turbo C. alloc.c (ext2fs_new_inode): Use ino_t instead of int for the group number. get_pathname.c: Use ino_t instead of int where appropriate. ext2fs.h: Make the magic structure element be errcode_t instead of int. alloc.c alloc_tables.c badblocks.c bb_compat.c bb_inode.c bitmaps.c block.c bmove.c brel_ma.c check_desc.c closefs.c cmp_bitmaps.c dblist.c dblist_dir.c dir_iterate.c dirblock.c dupfs.c expanddir.c freefs.c get_pathname.c icount.c initialize.c inline.c inode.c irel_ma.c link.c llseek.c lookup.c mkdir.c namei.c newdir.c read_bb.c read_bb_file.c rs_bitmap.c rw_bitmaps.c swapfs.c test_io.c tst_badblocks.c tst_iscan.c unix_io.c unlink.c valid_blk.c version.c: Add an #ifdef for HAVE_UNISTD_H
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#if HAVE_UNISTD_H
Many files: Checkin of e2fsprogs 1.10
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#include <unistd.h>
Many files: block.c (ext2fs_block_iterate2): Use retval which is a errcode_t type. bitmaps.c (make_bitmap): Use size_t instead of int where appropriate. bb_inode.c (set_bad_block_proc): Add #pragma argsused for Turbo C. alloc.c (ext2fs_new_inode): Use ino_t instead of int for the group number. get_pathname.c: Use ino_t instead of int where appropriate. ext2fs.h: Make the magic structure element be errcode_t instead of int. alloc.c alloc_tables.c badblocks.c bb_compat.c bb_inode.c bitmaps.c block.c bmove.c brel_ma.c check_desc.c closefs.c cmp_bitmaps.c dblist.c dblist_dir.c dir_iterate.c dirblock.c dupfs.c expanddir.c freefs.c get_pathname.c icount.c initialize.c inline.c inode.c irel_ma.c link.c llseek.c lookup.c mkdir.c namei.c newdir.c read_bb.c read_bb_file.c rs_bitmap.c rw_bitmaps.c swapfs.c test_io.c tst_badblocks.c tst_iscan.c unix_io.c unlink.c valid_blk.c version.c: Add an #ifdef for HAVE_UNISTD_H
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#endif
Many files: Checkin of e2fsprogs 1.10
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#include <time.h>
#include <string.h>
Many files: inode.c (ext2fs_open_inode_scan): Initialize the group variables so that we don't need to call get_next_blockgroup() the first time around. Saves a bit of time, and prevents us from needing to assign -1 to current_group (which is an unsigned value). icount.c (insert_icount_el): Cast the estimated number of inodes from a float to an ino_t. alloc.c, alloc_tables.c, badlbocks.c, bb_compat.c, bb_inode.c, bitmaps.c, bitops.c, block.c, bmap.c, bmove.c, brel_ma.c, check_desc.c, closefs.c, cmp_bitmaps.c, dblist.c, dblist_dir.c, dir_iterate.c, dirblock.c, dupfs.c, expanddir.c, ext2fs.h, fileio.c, freefs.c, get_pathname.c, getsize.c, icount.c, initialize.c, inline.c, inode.c, irel_ma.c, ismounted.c, link.c, lookup.c, mkdir.c, namei.c, native.c, newdir.c, openfs.c, read_bb.c, read_bb_file.c, rs_bitmap.c, rw_bitmaps.c, swapfs.c, test_io.c, tst_badblocks.c, tst_getsize.c, tst_iscan.c, unix_io.c, unlink.c, valid_blk.c, version.c: If EXT2_FLAT_INCLUDES is defined, then assume all of the ext2-specific header files are in a flat directory. block.c, bmove.c, dirblock.c, fileio.c: Explicitly cast all assignments from void * to be compatible with C++. closefs.c (ext2fs_flush): Add a call to io_channel_flush() to make sure the contents of the disk are flushed to disk. dblist.c (ext2fs_add_dir_block): Change new to be new_entry to avoid C++ namespace clash. bitmaps.c (ext2fs_copy_bitmap): Change new to be new_map to avoid C++ namespace clash. ext2fs.h, bb_inode.c, block.c, bmove.c, brel.h, brel_ma.c, irel.h, irel_ma.c, dblist.c, dblist_dir.c, dir_iterate.c, ext2fsP.h, expanddir.c, get_pathname.c, inode.c, link.c, unlink.c: Change private to be priv_data (to avoid C++ namespace clash)
1998-01-19 17:47:53 +03:00
#include "ext2_fs.h"
Many files: Checkin of e2fsprogs 1.10
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#include "ext2fsP.h"
errcode_t ext2fs_dup_handle(ext2_filsys src, ext2_filsys *dest)
{
ext2_filsys fs;
errcode_t retval;
EXT2_CHECK_MAGIC(src, EXT2_ET_MAGIC_EXT2FS_FILSYS);
Remove trailing whitespace for the entire source tree Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2008-08-28 07:07:54 +04:00
ext2fs_getmem(), ext2fs_free_mem(), and ext2fs_resize_mem() all now take a 'void *' instead of a 'void **' in order to avoid pointer aliasing problems with GCC 3.x.
2003-08-01 17:41:07 +04:00
retval = ext2fs_get_mem(sizeof(struct struct_ext2_filsys), &fs);
Many files: Added definition of ext2fs_get_mem, ext2fs_free_mem, and ext2fs_resize_mem in ext2fs.h, and changed all library routines to use these wrapper functions.
1997-10-26 06:41:24 +03:00
if (retval)
return retval;
Many files: Checkin of e2fsprogs 1.10
1997-04-30 01:26:48 +04:00
*fs = *src;
fs->device_name = 0;
fs->super = 0;
dupfs.c (ext2fs_dup_handle): Make sure the new filesystem handle has its own copy of the orig_super data structure. (This is a better way of fixing a double-free problem in resize2fs which Fedora attempted to fix in e2fsprogs-1.35-double_free.patch. Addresses Red Hat Bugzilla #132707.)
2005-01-05 11:16:09 +03:00
fs->orig_super = 0;
Many files: Checkin of e2fsprogs 1.10
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fs->group_desc = 0;
fs->inode_map = 0;
fs->block_map = 0;
fs->badblocks = 0;
fs->dblist = 0;
libext2fs: ext2fs_dup_handle should not alias MMP buffers It turns out that resize2fs uses ext2fs_dup_handle to duplicate fs handles. If MMP is enabled, this causes both handles to share MMP buffers, which is bad news when it comes time to free both handles. Change the code to (we hope) fix this. This prevents resize2fs from failing with a double-free error when handed a MMP filesystem. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-09-09 18:39:29 +04:00
fs->mmp_buf = 0;
fs->mmp_cmp = 0;
fs->mmp_fd = -1;
Many files: Checkin of e2fsprogs 1.10
1997-04-30 01:26:48 +04:00
io_channel_bumpcount(fs->io);
if (fs->icache)
fs->icache->refcount++;
ext2fs_getmem(), ext2fs_free_mem(), and ext2fs_resize_mem() all now take a 'void *' instead of a 'void **' in order to avoid pointer aliasing problems with GCC 3.x.
2003-08-01 17:41:07 +04:00
retval = ext2fs_get_mem(strlen(src->device_name)+1, &fs->device_name);
Many files: Added definition of ext2fs_get_mem, ext2fs_free_mem, and ext2fs_resize_mem in ext2fs.h, and changed all library routines to use these wrapper functions.
1997-10-26 06:41:24 +03:00
if (retval)
Many files: Checkin of e2fsprogs 1.10
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goto errout;
strcpy(fs->device_name, src->device_name);
ext2fs_getmem(), ext2fs_free_mem(), and ext2fs_resize_mem() all now take a 'void *' instead of a 'void **' in order to avoid pointer aliasing problems with GCC 3.x.
2003-08-01 17:41:07 +04:00
retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->super);
Many files: Added definition of ext2fs_get_mem, ext2fs_free_mem, and ext2fs_resize_mem in ext2fs.h, and changed all library routines to use these wrapper functions.
1997-10-26 06:41:24 +03:00
if (retval)
Many files: Checkin of e2fsprogs 1.10
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goto errout;
memcpy(fs->super, src->super, SUPERBLOCK_SIZE);
dupfs.c (ext2fs_dup_handle): Make sure the new filesystem handle has its own copy of the orig_super data structure. (This is a better way of fixing a double-free problem in resize2fs which Fedora attempted to fix in e2fsprogs-1.35-double_free.patch. Addresses Red Hat Bugzilla #132707.)
2005-01-05 11:16:09 +03:00
retval = ext2fs_get_mem(SUPERBLOCK_SIZE, &fs->orig_super);
if (retval)
goto errout;
memcpy(fs->orig_super, src->orig_super, SUPERBLOCK_SIZE);
libext2fs: Add checks to prevent integer overflows passed to malloc() This addresses a potential security vulnerability where an untrusted filesystem can be corrupted in such a way that a program using libext2fs will allocate a buffer which is far too small. This can lead to either a crash or potentially a heap-based buffer overflow crash. No known exploits exist, but main concern is where an untrusted user who possesses privileged access in a guest Xen environment could corrupt a filesystem which is then accessed by the pygrub program, running as root in the dom0 host environment, thus allowing the untrusted user to gain privileged access in the host OS. Thanks to the McAfee AVERT Research group for reporting this issue. Addresses CVE-2007-5497. Signed-off-by: Rafal Wojtczuk <rafal_wojtczuk@mcafee.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2007-11-10 03:01:06 +03:00
retval = ext2fs_get_array(fs->desc_blocks, fs->blocksize,
ext2fs_getmem(), ext2fs_free_mem(), and ext2fs_resize_mem() all now take a 'void *' instead of a 'void **' in order to avoid pointer aliasing problems with GCC 3.x.
2003-08-01 17:41:07 +04:00
&fs->group_desc);
Many files: Added definition of ext2fs_get_mem, ext2fs_free_mem, and ext2fs_resize_mem in ext2fs.h, and changed all library routines to use these wrapper functions.
1997-10-26 06:41:24 +03:00
if (retval)
Many files: Checkin of e2fsprogs 1.10
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goto errout;
memcpy(fs->group_desc, src->group_desc,
Many files: dosio.c: New file to do DOS/BIOS disk accesses. namei.c (open_namei): Make pathlen be of type size_t. llseek.c: Always #include stdlib.h since it's need to define size_t. io.h: Use errcode_t for magic numbers. icount.c (get_icount_el), dupfs.c (ext2fs_dup_handle), dblist.c (dir_block_cmp): Use size_t where appropriate. read_bb.c (ext2fs_read_bb_inode), cmp_bitmaps.c (ext2fs_compare_inode_bitmap): Use blk_t, ino_t and size_t where appropriate. closefs.c (ext2fs_flush): Use dgrp_t instead of int where appropriate. openfs.c (ext2fs_open), check_desc.c (ext2fs_check_desc): Use blk_t instead of int where appropriate. rw_bitmaps.c (read_bitmaps), irel_ma.c, inode.c (ext2fs_write_inode), initialize.c (ext2fs_initialize): brel_ma.c: Fix to make be 16-bit safe. link.c (ext2fs_link), unlink.c (ext2fs_unlink), lookup.c (lookup_proc), ismounted.c (ext2fs_check_if_mounted), block.c (xlate_func): Add #pragma argsused for Turbo C.
1997-08-12 00:29:22 +04:00
(size_t) fs->desc_blocks * fs->blocksize);
Many files: Checkin of e2fsprogs 1.10
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if (src->inode_map) {
retval = ext2fs_copy_bitmap(src->inode_map, &fs->inode_map);
if (retval)
goto errout;
}
if (src->block_map) {
retval = ext2fs_copy_bitmap(src->block_map, &fs->block_map);
if (retval)
goto errout;
}
if (src->badblocks) {
retval = ext2fs_badblocks_copy(src->badblocks, &fs->badblocks);
if (retval)
goto errout;
}
if (src->dblist) {
retval = ext2fs_copy_dblist(src->dblist, &fs->dblist);
if (retval)
goto errout;
}
libext2fs: ext2fs_dup_handle should not alias MMP buffers It turns out that resize2fs uses ext2fs_dup_handle to duplicate fs handles. If MMP is enabled, this causes both handles to share MMP buffers, which is bad news when it comes time to free both handles. Change the code to (we hope) fix this. This prevents resize2fs from failing with a double-free error when handed a MMP filesystem. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-09-09 18:39:29 +04:00
if (src->mmp_buf) {
retval = ext2fs_get_mem(src->blocksize, &fs->mmp_buf);
if (retval)
goto errout;
memcpy(fs->mmp_buf, src->mmp_buf, src->blocksize);
}
if (src->mmp_fd >= 0) {
fs->mmp_fd = dup(src->mmp_fd);
if (fs->mmp_fd < 0) {
retval = EXT2_ET_MMP_OPEN_DIRECT;
goto errout;
}
}
if (src->mmp_cmp) {
int align = ext2fs_get_dio_alignment(src->mmp_fd);
retval = ext2fs_get_memalign(src->blocksize, align,
&fs->mmp_cmp);
if (retval)
goto errout;
memcpy(fs->mmp_cmp, src->mmp_cmp, src->blocksize);
}
Many files: Checkin of e2fsprogs 1.10
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*dest = fs;
return 0;
errout:
ext2fs_free(fs);
return retval;
Remove trailing whitespace for the entire source tree Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2008-08-28 07:07:54 +04:00
Many files: Checkin of e2fsprogs 1.10
1997-04-30 01:26:48 +04:00
}