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authorSriram Rajagopalan <sriramr@arista.com>2019-05-10 19:28:06 -0400
committerTheodore Ts'o <tytso@mit.edu>2019-05-10 19:28:06 -0400
commit592acbf16821288ecdc4192c47e3774a4c48bb64 (patch)
tree1b196247f70faa977aafc443bf57ecedd4490503 /fs/ext4/extents.c
parentdb90f41916cf04c020062f8d8b0385942248283e (diff)
ext4: zero out the unused memory region in the extent tree block
This commit zeroes out the unused memory region in the buffer_head corresponding to the extent metablock after writing the extent header and the corresponding extent node entries. This is done to prevent random uninitialized data from getting into the filesystem when the extent block is synced. This fixes CVE-2019-11833. Signed-off-by: Sriram Rajagopalan <sriramr@arista.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org
Diffstat (limited to 'fs/ext4/extents.c')
-rw-r--r--fs/ext4/extents.c17
1 files changed, 15 insertions, 2 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 0f89f5190cd7..f2c62e2a0c98 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -1035,6 +1035,7 @@ static int ext4_ext_split(handle_t *handle, struct inode *inode,
__le32 border;
ext4_fsblk_t *ablocks = NULL; /* array of allocated blocks */
int err = 0;
+ size_t ext_size = 0;
/* make decision: where to split? */
/* FIXME: now decision is simplest: at current extent */
@@ -1126,6 +1127,10 @@ static int ext4_ext_split(handle_t *handle, struct inode *inode,
le16_add_cpu(&neh->eh_entries, m);
}
+ /* zero out unused area in the extent block */
+ ext_size = sizeof(struct ext4_extent_header) +
+ sizeof(struct ext4_extent) * le16_to_cpu(neh->eh_entries);
+ memset(bh->b_data + ext_size, 0, inode->i_sb->s_blocksize - ext_size);
ext4_extent_block_csum_set(inode, neh);
set_buffer_uptodate(bh);
unlock_buffer(bh);
@@ -1205,6 +1210,11 @@ static int ext4_ext_split(handle_t *handle, struct inode *inode,
sizeof(struct ext4_extent_idx) * m);
le16_add_cpu(&neh->eh_entries, m);
}
+ /* zero out unused area in the extent block */
+ ext_size = sizeof(struct ext4_extent_header) +
+ (sizeof(struct ext4_extent) * le16_to_cpu(neh->eh_entries));
+ memset(bh->b_data + ext_size, 0,
+ inode->i_sb->s_blocksize - ext_size);
ext4_extent_block_csum_set(inode, neh);
set_buffer_uptodate(bh);
unlock_buffer(bh);
@@ -1270,6 +1280,7 @@ static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
ext4_fsblk_t newblock, goal = 0;
struct ext4_super_block *es = EXT4_SB(inode->i_sb)->s_es;
int err = 0;
+ size_t ext_size = 0;
/* Try to prepend new index to old one */
if (ext_depth(inode))
@@ -1295,9 +1306,11 @@ static int ext4_ext_grow_indepth(handle_t *handle, struct inode *inode,
goto out;
}
+ ext_size = sizeof(EXT4_I(inode)->i_data);
/* move top-level index/leaf into new block */
- memmove(bh->b_data, EXT4_I(inode)->i_data,
- sizeof(EXT4_I(inode)->i_data));
+ memmove(bh->b_data, EXT4_I(inode)->i_data, ext_size);
+ /* zero out unused area in the extent block */
+ memset(bh->b_data + ext_size, 0, inode->i_sb->s_blocksize - ext_size);
/* set size of new block */
neh = ext_block_hdr(bh);