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| author | Theodore Ts'o <tytso@mit.edu> | 2018-06-14 19:55:10 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2018-06-14 19:55:10 +0300 |
| commit | bc890a60247171294acc0bd67d211fa4b88d40ba (patch) | |
| tree | cb1aeb05ac0a8eb30f12d49c68da6f1a65187bc2 /fs/ext4/ext4_extents.h | |
| parent | 8844618d8aa7a9973e7b527d038a2a589665002c (diff) | |
| download | linux-bc890a60247171294acc0bd67d211fa4b88d40ba.tar.xz | |
ext4: verify the depth of extent tree in ext4_find_extent()
If there is a corupted file system where the claimed depth of the
extent tree is -1, this can cause a massive buffer overrun leading to
sadness.
This addresses CVE-2018-10877.
https://bugzilla.kernel.org/show_bug.cgi?id=199417
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Diffstat (limited to 'fs/ext4/ext4_extents.h')
| -rw-r--r-- | fs/ext4/ext4_extents.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/ext4/ext4_extents.h b/fs/ext4/ext4_extents.h index 98fb0c119c68..adf6668b596f 100644 --- a/fs/ext4/ext4_extents.h +++ b/fs/ext4/ext4_extents.h @@ -91,6 +91,7 @@ struct ext4_extent_header { }; #define EXT4_EXT_MAGIC cpu_to_le16(0xf30a) +#define EXT4_MAX_EXTENT_DEPTH 5 #define EXT4_EXTENT_TAIL_OFFSET(hdr) \ (sizeof(struct ext4_extent_header) + \ |