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| author | Ramon de Carvalho Valle <ramon@risesecurity.org> | 2009-07-28 22:58:22 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-07-29 01:26:06 +0400 |
| commit | f151cd2c54ddc7714e2f740681350476cda03a28 (patch) | |
| tree | 81591bb25357c0d02a0549efadb62b67ba166434 /fs | |
| parent | 6352a29305373ae6196491e6d4669f301e26492e (diff) | |
| download | linux-f151cd2c54ddc7714e2f740681350476cda03a28.tar.xz | |
eCryptfs: parse_tag_3_packet check tag 3 packet encrypted key size
The parse_tag_3_packet function does not check if the tag 3 packet contains a
encrypted key size larger than ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES.
Signed-off-by: Ramon de Carvalho Valle <ramon@risesecurity.org>
[tyhicks@linux.vnet.ibm.com: Added printk newline and changed goto to out_free]
Signed-off-by: Tyler Hicks <tyhicks@linux.vnet.ibm.com>
Cc: stable@kernel.org (2.6.27 and 30)
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ecryptfs/keystore.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/ecryptfs/keystore.c b/fs/ecryptfs/keystore.c index 5414253d4c97..259525c9abb8 100644 --- a/fs/ecryptfs/keystore.c +++ b/fs/ecryptfs/keystore.c @@ -1303,6 +1303,13 @@ parse_tag_3_packet(struct ecryptfs_crypt_stat *crypt_stat, } (*new_auth_tok)->session_key.encrypted_key_size = (body_size - (ECRYPTFS_SALT_SIZE + 5)); + if ((*new_auth_tok)->session_key.encrypted_key_size + > ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES) { + printk(KERN_WARNING "Tag 3 packet contains key larger " + "than ECRYPTFS_MAX_ENCRYPTED_KEY_BYTES\n"); + rc = -EINVAL; + goto out_free; + } if (unlikely(data[(*packet_size)++] != 0x04)) { printk(KERN_WARNING "Unknown version number [%d]\n", data[(*packet_size) - 1]); |