2.6.27-stable review patch. If anyone has any objections, please let us know. ------------------ From: Tyler Hicks commit 6352a29305373ae6196491e6d4669f301e26492e upstream. Tag 11 packets are stored in the metadata section of an eCryptfs file to store the key signature(s) used to encrypt the file encryption key. After extracting the packet length field to determine the key signature length, a check is not performed to see if the length would exceed the key signature buffer size that was passed into parse_tag_11_packet(). Thanks to Ramon de Carvalho Valle for finding this bug using fsfuzzer. Signed-off-by: Tyler Hicks Signed-off-by: Linus Torvalds Signed-off-by: Greg Kroah-Hartman --- fs/ecryptfs/keystore.c | 6 ++++++ 1 file changed, 6 insertions(+) --- a/fs/ecryptfs/keystore.c +++ b/fs/ecryptfs/keystore.c @@ -876,6 +876,12 @@ parse_tag_11_packet(unsigned char *data, rc = -EINVAL; goto out; } + if (unlikely((*tag_11_contents_size) > max_contents_bytes)) { + printk(KERN_ERR "Literal data section in tag 11 packet exceeds " + "expected size\n"); + rc = -EINVAL; + goto out; + } if (data[(*packet_size)++] != 0x62) { printk(KERN_WARNING "Unrecognizable packet\n"); rc = -EINVAL; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/