forked from luck/tmp_suning_uos_patched
ext4: use atomic64_t for the per-flexbg free_clusters count
A user who was using a 8TB+ file system and with a very large flexbg
size (> 65536) could cause the atomic_t used in the struct flex_groups
to overflow. This was detected by PaX security patchset:
http://forums.grsecurity.net/viewtopic.php?f=3&t=3289&p=12551#p12551
This bug was introduced in commit 9f24e4208f
, so it's been around
since 2.6.30. :-(
Fix this by using an atomic64_t for struct orlav_stats's
free_clusters.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Lukas Czerner <lczerner@redhat.com>
Cc: stable@vger.kernel.org
This commit is contained in:
parent
ad56edad08
commit
90ba983f68
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@ -335,9 +335,9 @@ struct ext4_group_desc
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*/
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struct flex_groups {
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atomic_t free_inodes;
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atomic_t free_clusters;
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atomic_t used_dirs;
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atomic64_t free_clusters;
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atomic_t free_inodes;
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atomic_t used_dirs;
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};
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#define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
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@ -324,8 +324,8 @@ void ext4_free_inode(handle_t *handle, struct inode *inode)
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}
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struct orlov_stats {
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__u64 free_clusters;
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__u32 free_inodes;
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__u32 free_clusters;
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__u32 used_dirs;
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};
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@ -342,7 +342,7 @@ static void get_orlov_stats(struct super_block *sb, ext4_group_t g,
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if (flex_size > 1) {
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stats->free_inodes = atomic_read(&flex_group[g].free_inodes);
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stats->free_clusters = atomic_read(&flex_group[g].free_clusters);
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stats->free_clusters = atomic64_read(&flex_group[g].free_clusters);
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stats->used_dirs = atomic_read(&flex_group[g].used_dirs);
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return;
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}
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@ -2804,8 +2804,8 @@ ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
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if (sbi->s_log_groups_per_flex) {
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ext4_group_t flex_group = ext4_flex_group(sbi,
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ac->ac_b_ex.fe_group);
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atomic_sub(ac->ac_b_ex.fe_len,
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&sbi->s_flex_groups[flex_group].free_clusters);
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atomic64_sub(ac->ac_b_ex.fe_len,
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&sbi->s_flex_groups[flex_group].free_clusters);
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}
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err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh);
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@ -4661,8 +4661,8 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode,
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if (sbi->s_log_groups_per_flex) {
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ext4_group_t flex_group = ext4_flex_group(sbi, block_group);
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atomic_add(count_clusters,
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&sbi->s_flex_groups[flex_group].free_clusters);
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atomic64_add(count_clusters,
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&sbi->s_flex_groups[flex_group].free_clusters);
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}
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ext4_mb_unload_buddy(&e4b);
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@ -4804,8 +4804,8 @@ int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
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if (sbi->s_log_groups_per_flex) {
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ext4_group_t flex_group = ext4_flex_group(sbi, block_group);
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atomic_add(EXT4_NUM_B2C(sbi, blocks_freed),
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&sbi->s_flex_groups[flex_group].free_clusters);
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atomic64_add(EXT4_NUM_B2C(sbi, blocks_freed),
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&sbi->s_flex_groups[flex_group].free_clusters);
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}
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ext4_mb_unload_buddy(&e4b);
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@ -1360,8 +1360,8 @@ static void ext4_update_super(struct super_block *sb,
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sbi->s_log_groups_per_flex) {
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ext4_group_t flex_group;
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flex_group = ext4_flex_group(sbi, group_data[0].group);
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atomic_add(EXT4_NUM_B2C(sbi, free_blocks),
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&sbi->s_flex_groups[flex_group].free_clusters);
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atomic64_add(EXT4_NUM_B2C(sbi, free_blocks),
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&sbi->s_flex_groups[flex_group].free_clusters);
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atomic_add(EXT4_INODES_PER_GROUP(sb) * flex_gd->count,
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&sbi->s_flex_groups[flex_group].free_inodes);
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}
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@ -1923,8 +1923,8 @@ static int ext4_fill_flex_info(struct super_block *sb)
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flex_group = ext4_flex_group(sbi, i);
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atomic_add(ext4_free_inodes_count(sb, gdp),
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&sbi->s_flex_groups[flex_group].free_inodes);
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atomic_add(ext4_free_group_clusters(sb, gdp),
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&sbi->s_flex_groups[flex_group].free_clusters);
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atomic64_add(ext4_free_group_clusters(sb, gdp),
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&sbi->s_flex_groups[flex_group].free_clusters);
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atomic_add(ext4_used_dirs_count(sb, gdp),
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&sbi->s_flex_groups[flex_group].used_dirs);
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}
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