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Date: Thu, 16 Jun 2022 09:06:55 +0800 From: Baokun Li <libaokun1@...wei.com> To: Jan Kara <jack@...e.cz> CC: <linux-ext4@...r.kernel.org>, <tytso@....edu>, <adilger.kernel@...ger.ca>, <ritesh.list@...il.com>, <lczerner@...hat.com>, <enwlinux@...il.com>, <linux-kernel@...r.kernel.org>, <yi.zhang@...wei.com>, <yebin10@...wei.com>, <yukuai3@...wei.com>, Baokun Li <libaokun1@...wei.com> Subject: Re: [PATCH v2 1/4] ext4: add EXT4_INODE_HAVE_XATTR_SPACE macro in xattr.h 在 2022/6/15 20:46, Jan Kara 写道: > On Wed 15-06-22 12:06:27, Baokun Li wrote: >> When adding an xattr to an inode, we must ensure that the inode_size is >> not less than EXT4_GOOD_OLD_INODE_SIZE + extra_isize + pad. Otherwise, >> the end position may be greater than the start position, resulting in UAF. >> >> Signed-off-by: Baokun Li <libaokun1@...wei.com> > ... > >> +/* >> + * If we want to add an xattr to the inode, we should make sure that >> + * i_extra_isize is not 0 and that the inode size is not less than >> + * EXT4_GOOD_OLD_INODE_SIZE + extra_isize + pad. >> + * EXT4_GOOD_OLD_INODE_SIZE extra_isize header entry pad data >> + * |--------------------------|------------|------|---------|---|-------| >> + */ >> +#define EXT4_INODE_HAVE_XATTR_SPACE(inode) \ > Gramatically correct would be EXT4_INODE_**HAS**_XATTR_SPACE and I'd be for > using that. Otherwise the whole series looks good so feel free to add: > > Reviewed-by: Jan Kara <jack@...e.cz> > > Honza I'm sorry, I didn't notice it was "HAS." Thank you very much for your correction. I will send a patch V3 with the changes suggested by you. Thanks again! -- With Best Regards, Baokun Li .
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