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  1. 23 5月, 2018 2 次提交
  3. 21 5月, 2018 2 次提交
  5. 14 5月, 2018 6 次提交
  7. 13 5月, 2018 3 次提交
  9. 12 5月, 2018 2 次提交
  11. 10 5月, 2018 3 次提交
    • E
      ext4: use raw i_version value for ea_inode · e254d1af
      由 Eryu Guan 提交于 
      Currently, creating large xattr (e.g. 2k) in ea_inode would cause
ea_inode refcount corruption, e.g.

  Pass 4: Checking reference counts
  Extended attribute inode 13 ref count is 0, should be 1. Fix? no

This is because that we save the lower 32bit of refcount in
inode->i_version and store it in raw_inode->i_disk_version on disk.
But since commit ee73f9a5 ("ext4: convert to new i_version
API"), we load/store modified i_disk_version from/to disk instead of
raw value, which causes on-disk ea_inode refcount corruption.

Fix it by loading/storing raw i_version/i_disk_version, because it's
a self-managed value in this case.

Fixes: ee73f9a5 ("ext4: convert to new i_version API")
Cc: Tahsin Erdogan <tahsin@google.com>
Signed-off-by: NEryu Guan <guaneryu@gmail.com>
Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
      e254d1af
    • E
      ext4: use XATTR_CREATE in ext4_initxattrs() · 3f706c8c
      由 Eryu Guan 提交于 
      I hit ENOSPC error when creating new file in a newly created ext4
with ea_inode feature enabled, if selinux is enabled and ext4 is
mounted without any selinux context. e.g.

  mkfs -t ext4 -O ea_inode -F /dev/sda5
  mount /dev/sda5 /mnt/ext4
  touch /mnt/ext4/testfile  # got ENOSPC here

It turns out that we run out of journal credits in
ext4_xattr_set_handle() when creating new selinux label for the
newly created inode.

This is because that in __ext4_new_inode() we use
__ext4_xattr_set_credits() to calculate the reserved credits for new
xattr, with the 'is_create' argument being true, which implies less
credits in the ea_inode case. But we calculate the required credits
in ext4_xattr_set_handle() with 'is_create' being false, which means
we need more credits if ea_inode feature is enabled. So we don't
have enough credits and error out with ENOSPC.

Fix it by simply calling ext4_xattr_set_handle() with XATTR_CREATE
flag in ext4_initxattrs(), so we end up with requiring less credits
than reserved. The semantic of XATTR_CREATE is "Perform a pure
create, which fails if the named attribute exists already." (from
setxattr(2)), which is fine in this case, because we only call
ext4_initxattrs() on newly created inode.

Fixes: af65207c ("ext4: fix __ext4_new_inode() journal credits calculation")
Cc: Tahsin Erdogan <tahsin@google.com>
Signed-off-by: NEryu Guan <guaneryu@gmail.com>
Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
      3f706c8c
    • M
      ext4: make function ‘ext4_getfsmap_find_fixed_metadata’ static · 472d8ea1
      由 Mathieu Malaterre 提交于 
      Since function ‘ext4_getfsmap_find_fixed_metadata’ can be made static,
make it so. Remove the following gcc warning (W=1):

  fs/ext4/fsmap.c:405:5: warning: no previous prototype for ‘ext4_getfsmap_find_fixed_metadata’ [-Wmissing-prototypes]
Signed-off-by: NMathieu Malaterre <malat@debian.org>
Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
      472d8ea1
  13. 26 4月, 2018 1 次提交
  15. 24 4月, 2018 1 次提交
    • L
      ext4: fix bitmap position validation · 22be37ac
      由 Lukas Czerner 提交于 
      Currently in ext4_valid_block_bitmap() we expect the bitmap to be
positioned anywhere between 0 and s_blocksize clusters, but that's
wrong because the bitmap can be placed anywhere in the block group. This
causes false positives when validating bitmaps on perfectly valid file
system layouts. Fix it by checking whether the bitmap is within the group
boundary.

The problem can be reproduced using the following

mkfs -t ext3 -E stride=256 /dev/vdb1
mount /dev/vdb1 /mnt/test
cd /mnt/test
wget https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.16.3.tar.xz
tar xf linux-4.16.3.tar.xz

This will result in the warnings in the logs

EXT4-fs error (device vdb1): ext4_validate_block_bitmap:399: comm tar: bg 84: block 2774529: invalid block bitmap

[ Changed slightly for clarity and to not drop a overflow test -- TYT ]
Signed-off-by: NLukas Czerner <lczerner@redhat.com>
Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
Reported-by: NIlya Dryomov <idryomov@gmail.com>
Fixes: 7dac4a17 ("ext4: add validity checks for bitmap block numbers")
Cc: stable@vger.kernel.org
      22be37ac
  17. 12 4月, 2018 1 次提交
    • E
      ext4: prevent right-shifting extents beyond EXT_MAX_BLOCKS · 349fa7d6
      由 Eric Biggers 提交于 
      During the "insert range" fallocate operation, extents starting at the
range offset are shifted "right" (to a higher file offset) by the range
length.  But, as shown by syzbot, it's not validated that this doesn't
cause extents to be shifted beyond EXT_MAX_BLOCKS.  In that case
->ee_block can wrap around, corrupting the extent tree.

Fix it by returning an error if the space between the end of the last
extent and EXT4_MAX_BLOCKS is smaller than the range being inserted.

This bug can be reproduced by running the following commands when the
current directory is on an ext4 filesystem with a 4k block size:

        fallocate -l 8192 file
        fallocate --keep-size -o 0xfffffffe000 -l 4096 -n file
        fallocate --insert-range -l 8192 file

Then after unmounting the filesystem, e2fsck reports corruption.

Reported-by: syzbot+06c885be0edcdaeab40c@syzkaller.appspotmail.com
Fixes: 331573fe ("ext4: Add support FALLOC_FL_INSERT_RANGE for fallocate")
Cc: stable@vger.kernel.org # v4.2+
Signed-off-by: NEric Biggers <ebiggers@google.com>
Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
      349fa7d6
  19. 02 4月, 2018 1 次提交
    • T
      ext4: force revalidation of directory pointer after seekdir(2) · e40ff213
      由 Theodore Ts'o 提交于 
      A malicious user could force the directory pointer to be in an invalid
spot by using seekdir(2).  Use the mechanism we already have to notice
if the directory has changed since the last time we called
ext4_readdir() to force a revalidation of the pointer.

Reported-by: syzbot+1236ce66f79263e8a862@syzkaller.appspotmail.com
Signed-off-by: NTheodore Ts'o <tytso@mit.edu>
Cc: stable@vger.kernel.org
      e40ff213
  21. 31 3月, 2018 4 次提交
  23. 30 3月, 2018 10 次提交
  25. 28 3月, 2018 1 次提交
  27. 27 3月, 2018 1 次提交
  29. 26 3月, 2018 2 次提交