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Message-ID: <33830a07-ffa9-d5da-d082-be1037d53ad8@huawei.com> Date: Mon, 25 Dec 2023 10:56:25 +0800 From: Baokun Li <libaokun1@...wei.com> To: Theodore Ts'o <tytso@....edu> CC: Al Viro <viro@...iv.linux.org.uk>, Edward Adam Davis <eadavis@...com>, <syzbot+2c4a3b922a860084cc7f@...kaller.appspotmail.com>, <adilger.kernel@...ger.ca>, <linux-ext4@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>, <syzkaller-bugs@...glegroups.com>, yangerkun <yangerkun@...wei.com>, Baokun Li <libaokun1@...wei.com> Subject: Re: [PATCH] ext4: fix WARNING in lock_two_nondirectories On 2023/12/25 10:49, Theodore Ts'o wrote: > On Mon, Dec 25, 2023 at 10:33:20AM +0800, Baokun Li wrote: >> Since in the current logic we update the boot loader file via >> swap_inode_boot_loader(), however the boot loader inode on disk >> may be uninitialized and may be garbage data, so we allow to get a >> bad boot loader inode and then initialize it and swap it with the boot >> loader file to be set. >> When reinitializing the bad boot loader inode, something like an >> inode type conversion may occur. > Yes, but the boot laoder inode is *either* all zeros, or a regular > file. If it's a directory, then it's a malicious syzbot trying to > mess with our minds. > > Aside from the warning, it's pretty harmless, but it will very likely > result in a corrupted file system --- but the file system was > corrupted in the first place. So who cares? > > Just check to make sure that i_mode is either 0, or regular file, and > return EFSCORRUPTEd, and we're done. > > - Ted Yes, this seems to work, but for that matter, when i_mode is 0, we still trigger the WARN_ON_ONCE in lock_two_nondirectories(). Merry Christmas! -- With Best Regards, Baokun Li .
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