linux-kernel - Re: nfs-root: destructive call to __detach

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 for Android: free password hash cracker in your pocket

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

Date:	Mon, 17 Aug 2015 14:37:04 +0200
From:	Sven Geggus <lists@...hsschwanzdomain.de>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	linux-kernel@...r.kernel.org, trond.myklebust@...marydata.com,
	linux-nfs@...r.kernel.org
Subject: Re: nfs-root: destructive call to __detach_mounts /dev

Eric W. Biederman wrote:

> I don't have a clue what the issue would be but I would start with
> something like the patch below.

OK using it I got the following...
This time with /dev on another machine (same nfs root-fs):

Aug 17 13:57:04 dhcp195 kernel: NFS: nfs_lookup_revalidate(/dev): nfs_lookup_verify_inode() failed
Aug 17 13:57:04 dhcp195 kernel: NFS: nfs_lookup_revalidate(/dev) is invalid
Aug 17 13:57:04 dhcp195 kernel: NFSROOT __detach_mounts: dev
Aug 17 13:57:04 dhcp195 kernel: CPU: 3 PID: 32644 Comm: modtrack Tainted: P O    4.1.6-lomac1-00296-gfeae456 #7
Aug 17 13:57:04 dhcp195 kernel: Hardware name: System manufacturer System Product Name/P7P55D, BIOS 1807    07/22/2010
Aug 17 13:57:04 dhcp195 kernel: ffff88021315bc18 ffff88021315bbd8 ffffffff81560638 000000000000b413
Aug 17 13:57:04 dhcp195 kernel: ffff880216460f18 ffff88021315bbf8 ffffffff81106e1f 000000000000001b
Aug 17 13:57:04 dhcp195 kernel: ffff880216460f18 ffff88021315bc48 ffffffff810ffcf5 0000000005dd05dd
Aug 17 13:57:04 dhcp195 kernel: Call Trace:
Aug 17 13:57:04 dhcp195 kernel: [<ffffffff81560638>] dump_stack+0x4c/0x6e
Aug 17 13:57:04 dhcp195 kernel: [<ffffffff81106e1f>] __detach_mounts+0x20/0xdf
Aug 17 13:57:04 dhcp195 kernel: [<ffffffff810ffcf5>] d_invalidate+0x9a/0xc8
Aug 17 13:57:04 dhcp195 kernel: [<ffffffff810f6c49>] lookup_fast+0x1f5/0x26f
Aug 17 13:57:04 dhcp195 kernel: [<ffffffff810f6ef0>] do_last.isra.43+0xd6/0x9fb
Aug 17 13:57:04 dhcp195 kernel: [<ffffffff810f92a4>] path_openat+0x1d1/0x53e
Aug 17 13:57:04 dhcp195 kernel: [<ffffffff810fa077>] ? user_path_at_empty+0x63/0x93
Aug 17 13:57:04 dhcp195 kernel: [<ffffffff810fa11c>] do_filp_open+0x35/0x85
Aug 17 13:57:04 dhcp195 kernel: [<ffffffff811f1aa9>] ? find_next_zero_bit+0x17/0x1d
Aug 17 13:57:04 dhcp195 kernel: [<ffffffff81104364>] ? __alloc_fd+0xdd/0xef
Aug 17 13:57:04 dhcp195 kernel: [<ffffffff810eca9c>] do_sys_open+0x146/0x1d5
Aug 17 13:57:04 dhcp195 kernel: [<ffffffff810ecb55>] SyS_openat+0xf/0x11
Aug 17 13:57:04 dhcp195 kernel: [<ffffffff81565a57>] system_call_fastpath+0x12/0x6a

So this looks like I would need to add some debug output to
"nfs_lookup_verify_inode" then right?

Sven

-- 
Why are there so many Unix-haters-handbooks and not even one
Microsoft-Windows-haters handbook?
Gurer vf ab arrq sbe n unaqobbx gb ungr Zvpebfbsg Jvaqbjf!
/me is giggls@...net, http://sven.gegg.us/ on the Web
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/