linux-ext4 - [Bug 15792] ext4_inode_info->i

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon, 19 Apr 2010 03:43:24 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 15792] ext4_inode_info->i_flags modification is racy

https://bugzilla.kernel.org/show_bug.cgi?id=15792





--- Comment #5 from Dmitry Monakhov <dmonakhov@...nvz.org>  2010-04-19 03:42:20 ---
Ohh.. one more thing, which is not actually related with the name of the bug,
But this peace of code was already mention here. Let's just document this here.

fs/ext4/extents.c 
3288:int ext4_ext_get_blocks(...)
{
....
3477:   if (unlikely(EXT4_I(inode)->i_flags & EXT4_EOFBLOCKS_FL)) {
3478:           if (unlikely(!eh->eh_entries)) {
3479:                   EXT4_ERROR_INODE(inode,
3480:                                    "eh->eh_entries == 0 ee_block %d",
3481:                                    ex->ee_block);
3482:                   err = -EIO;
3483:                   goto out2;
3484:           }
3485:           last_ex = EXT_LAST_EXTENT(eh);
3486:           if (iblock + ar.len > le32_to_cpu(last_ex->ee_block)
3487:               + ext4_ext_get_actual_len(last_ex))
##### ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
##### If depth > 0 then last_ex may not be the latest extent of the file.
##### because "eh" is just a one of leafs(writing at the middle of a file)
##### We have to find latest extent by traversing a whole path again but
##### always chose the latest eh,ex.
3488:                   EXT4_I(inode)->i_flags &= ~EXT4_EOFBLOCKS_FL;
for (  
3489:   }

-- 
Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are watching the assignee of the bug.
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html