From f278235ce148485cdb9dc990673943addafbd577 Mon Sep 17 00:00:00 2001 From: Theodore Ts'o Date: Mon, 26 Mar 2018 23:54:10 -0400 Subject: [PATCH] ext4: add validity checks for bitmap block numbers commit 7dac4a1726a9c64a517d595c40e95e2d0d135f6f upstream. An privileged attacker can cause a crash by mounting a crafted ext4 image which triggers a out-of-bounds read in the function ext4_valid_block_bitmap() in fs/ext4/balloc.c. This issue has been assigned CVE-2018-1093. BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=199181 BugLink: https://bugzilla.redhat.com/show_bug.cgi?id=1560782 Reported-by: Wen Xu Signed-off-by: Theodore Ts'o [bwh: Backported to 3.2: - In ext4_valid_block_bitmap(), goto err_out on error - In ext4_read_{block,inode}_bitmap(), return NULL on error - Adjust context] Signed-off-by: Ben Hutchings --- fs/ext4/balloc.c | 16 ++++++++++++++-- fs/ext4/ialloc.c | 7 +++++++ 2 files changed, 21 insertions(+), 2 deletions(-) diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c index f91de781f27ac..fc69043eb2bed 100644 --- a/fs/ext4/balloc.c +++ b/fs/ext4/balloc.c @@ -298,20 +298,25 @@ static int ext4_valid_block_bitmap(struct super_block *sb, /* check whether block bitmap block number is set */ bitmap_blk = ext4_block_bitmap(sb, desc); offset = bitmap_blk - group_first_block; - if (!ext4_test_bit(EXT4_B2C(sbi, offset), bh->b_data)) + if (offset < 0 || EXT4_B2C(sbi, offset) >= sb->s_blocksize || + !ext4_test_bit(EXT4_B2C(sbi, offset), bh->b_data)) /* bad block bitmap */ goto err_out; /* check whether the inode bitmap block number is set */ bitmap_blk = ext4_inode_bitmap(sb, desc); offset = bitmap_blk - group_first_block; - if (!ext4_test_bit(EXT4_B2C(sbi, offset), bh->b_data)) + if (offset < 0 || EXT4_B2C(sbi, offset) >= sb->s_blocksize || + !ext4_test_bit(EXT4_B2C(sbi, offset), bh->b_data)) /* bad block bitmap */ goto err_out; /* check whether the inode table block number is set */ bitmap_blk = ext4_inode_table(sb, desc); offset = bitmap_blk - group_first_block; + if (offset < 0 || EXT4_B2C(sbi, offset) >= sb->s_blocksize || + EXT4_B2C(sbi, offset + sbi->s_itb_per_group) >= sb->s_blocksize) + goto err_out; next_zero_bit = ext4_find_next_zero_bit(bh->b_data, EXT4_B2C(sbi, offset + EXT4_SB(sb)->s_itb_per_group), EXT4_B2C(sbi, offset)); @@ -339,6 +344,7 @@ struct buffer_head * ext4_read_block_bitmap(struct super_block *sb, ext4_group_t block_group) { struct ext4_group_desc *desc; + struct ext4_sb_info *sbi = EXT4_SB(sb); struct buffer_head *bh = NULL; ext4_fsblk_t bitmap_blk; @@ -346,6 +352,12 @@ ext4_read_block_bitmap(struct super_block *sb, ext4_group_t block_group) if (!desc) return NULL; bitmap_blk = ext4_block_bitmap(sb, desc); + if ((bitmap_blk <= le32_to_cpu(sbi->s_es->s_first_data_block)) || + (bitmap_blk >= ext4_blocks_count(sbi->s_es))) { + ext4_error(sb, "Invalid block bitmap block %llu in " + "block_group %u", bitmap_blk, block_group); + return NULL; + } bh = sb_getblk(sb, bitmap_blk); if (unlikely(!bh)) { ext4_error(sb, "Cannot read block bitmap - " diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c index 476caae17161a..9603b79a92246 100644 --- a/fs/ext4/ialloc.c +++ b/fs/ext4/ialloc.c @@ -102,6 +102,7 @@ static struct buffer_head * ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group) { struct ext4_group_desc *desc; + struct ext4_sb_info *sbi = EXT4_SB(sb); struct buffer_head *bh = NULL; ext4_fsblk_t bitmap_blk; @@ -110,6 +111,12 @@ ext4_read_inode_bitmap(struct super_block *sb, ext4_group_t block_group) return NULL; bitmap_blk = ext4_inode_bitmap(sb, desc); + if ((bitmap_blk <= le32_to_cpu(sbi->s_es->s_first_data_block)) || + (bitmap_blk >= ext4_blocks_count(sbi->s_es))) { + ext4_error(sb, "Invalid inode bitmap blk %llu in " + "block_group %u", bitmap_blk, block_group); + return NULL; + } bh = sb_getblk(sb, bitmap_blk); if (unlikely(!bh)) { ext4_error(sb, "Cannot read inode bitmap - " -- 2.47.2