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:	Thu, 6 Feb 2014 15:41:11 +0900
From:	Namjae Jeon <>
To:	OGAWA Hirofumi <>
	Namjae Jeon <>,
	Amit Sahrawat <>
Subject: Re: [PATCH v3 1/6] fat: add i_disksize to represent uninitialized size

2014-02-04, OGAWA Hirofumi <>:
> OGAWA Hirofumi <> writes:
>>>> Don't we need to update ->i_disksize after cont_write_begin()?
>>> We don't need to update i_disksize after cont_write_begin.
>>> It is taken care by the fat_get_block after the allocation.
>>> For all write paths we align the mmu_private and i_disksize from
>>> fat_fill_inode and fat_get_block.
>> fat_fill_inode() just set i_disksize to i_size. So, it is not aligned by
>> cluster size or block size.
>> E.g. ->mmu_private = 500. Then, cont_write_begin() can set ->mmu_private
>> to 512 on some case. In this case, fat_get_block() will not be called,
>> because no new allocation.
>> If this is true, it would be possible to have ->mmu_private == 512 and
>> ->i_disksize == 500.
>> I'm missing something?
> BTW, even if above was right, I'm not checking whether updating
> ->i_disksize after cont_write_begin() is right fix or not.
I understand your concern. these can be mismatched.
But, when checking your doubt, I can not find any side effect.
I think that there is no issue regardless of alignment of two value,
in the cont_write_begin.
Could you please share any point I am missing ?
If you suggest checking point or test method, I can check more and
share the result.

Thanks OGAWA.
> --
> OGAWA Hirofumi <>
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists