| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Thu, 17 Oct 2013 21:51:03 -0700
From: "Darrick J. Wong" <darrick.wong@...cle.com>
To: tytso@....edu, darrick.wong@...cle.com
Cc: linux-ext4@...r.kernel.org
Subject: [PATCH 19/25] resize2fs: during shrink,
don't free in-use bg data clusters
When freeing a group's metadata blocks, be careful not to free
clusters belonging to other groups!
Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
resize/resize2fs.c | 78 +++++++++++++++++++++++++++++++++-------------------
1 file changed, 49 insertions(+), 29 deletions(-)
diff --git a/resize/resize2fs.c b/resize/resize2fs.c
index 5a576a7..12f6d16 100644
--- a/resize/resize2fs.c
+++ b/resize/resize2fs.c
@@ -602,40 +602,60 @@ static void fix_uninit_block_bitmaps(ext2_filsys fs)
* release them in the new filesystem data structure, and mark them as
* reserved so the old inode table blocks don't get overwritten.
*/
-static void free_gdp_blocks(ext2_filsys fs,
- ext2fs_block_bitmap reserve_blocks,
- ext2_filsys old_fs,
- dgrp_t group)
+static errcode_t free_gdp_blocks(ext2_filsys fs,
+ ext2fs_block_bitmap reserve_blocks,
+ ext2_filsys old_fs,
+ dgrp_t group, dgrp_t count)
{
blk64_t blk;
int j;
+ dgrp_t i;
+ ext2fs_block_bitmap bg_map = NULL;
+ errcode_t retval = 0;
- blk = ext2fs_block_bitmap_loc(old_fs, group);
- if (blk &&
- (blk < ext2fs_blocks_count(fs->super))) {
- ext2fs_block_alloc_stats2(fs, blk, -1);
- ext2fs_mark_block_bitmap2(reserve_blocks, blk);
- }
+ /* If bigalloc, don't free metadata living in the same cluster */
+ if (EXT2FS_CLUSTER_RATIO(fs) > 1) {
+ retval = ext2fs_allocate_block_bitmap(fs, "bgdata", &bg_map);
+ if (retval)
+ goto out;
- blk = ext2fs_inode_bitmap_loc(old_fs, group);
- if (blk &&
- (blk < ext2fs_blocks_count(fs->super))) {
- ext2fs_block_alloc_stats2(fs, blk, -1);
- ext2fs_mark_block_bitmap2(reserve_blocks, blk);
+ retval = mark_table_blocks(fs, bg_map);
+ if (retval)
+ goto out;
}
- blk = ext2fs_inode_table_loc(old_fs, group);
- if (blk == 0 ||
- (blk >= ext2fs_blocks_count(fs->super)))
- return;
+ for (i = group; i < group + count; i++) {
+ blk = ext2fs_block_bitmap_loc(old_fs, i);
+ if (blk &&
+ (blk < ext2fs_blocks_count(fs->super)) &&
+ !(bg_map && ext2fs_test_block_bitmap2(bg_map, blk))) {
+ ext2fs_block_alloc_stats2(fs, blk, -1);
+ ext2fs_mark_block_bitmap2(reserve_blocks, blk);
+ }
- for (j = 0;
- j < fs->inode_blocks_per_group; j++, blk++) {
- if (blk >= ext2fs_blocks_count(fs->super))
- break;
- ext2fs_block_alloc_stats2(fs, blk, -1);
- ext2fs_mark_block_bitmap2(reserve_blocks, blk);
+ blk = ext2fs_inode_bitmap_loc(old_fs, i);
+ if (blk &&
+ (blk < ext2fs_blocks_count(fs->super)) &&
+ !(bg_map && ext2fs_test_block_bitmap2(bg_map, blk))) {
+ ext2fs_block_alloc_stats2(fs, blk, -1);
+ ext2fs_mark_block_bitmap2(reserve_blocks, blk);
+ }
+
+ blk = ext2fs_inode_table_loc(old_fs, i);
+ for (j = 0;
+ j < fs->inode_blocks_per_group; j++, blk++) {
+ if (blk >= ext2fs_blocks_count(fs->super) ||
+ (bg_map && ext2fs_test_block_bitmap2(bg_map, blk)))
+ continue;
+ ext2fs_block_alloc_stats2(fs, blk, -1);
+ ext2fs_mark_block_bitmap2(reserve_blocks, blk);
+ }
}
+
+out:
+ if (bg_map)
+ ext2fs_free_block_bitmap(bg_map);
+ return retval;
}
/*
@@ -791,10 +811,10 @@ retry:
* Check the block groups that we are chopping off
* and free any blocks associated with their metadata
*/
- for (i = fs->group_desc_count;
- i < old_fs->group_desc_count; i++)
- free_gdp_blocks(fs, reserve_blocks, old_fs, i);
- retval = 0;
+ retval = free_gdp_blocks(fs, reserve_blocks, old_fs,
+ fs->group_desc_count,
+ old_fs->group_desc_count -
+ fs->group_desc_count);
goto errout;
}
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists