Hi again,
When using ecryptfs to encrypt a home directory under Gnome/Ubuntu, I am
seeing ecryptfs crash. Excerpt from dmesg below. Here is the procedure
that I followed:
* login as root
* create a new account called "tadm"
* remove the created home directory and recreate
% rm -rf /home/tadm /home/tadm.encrypted
% mkdir /home/tadm /home/tadm.encrypted
% chown tadm.tadm /home/tadm /home/tadm.encrypted
* mount the new home directory:
% mount -t ecryptfs /home/tadm.encrypted /home/tadm \
-o cipher=aes,ecryptfs_key_bytes=32
* logout
* login as tadm (from the gdm)
* open a terminal and run "dmesg"
* at this point the system is still "alive", but /home/tadm cannot be
unmounted and the system hangs if a reboot is attempted - only way out
is to hit the power button.
This specific dump was created running 2.6.21.7, but I see the same
behavior under other kernel versions.
Any idea on what might be going on here? Has anyone else succeeded in
using an encrypted home directory under Gnome without seeing this bug?
/Stefan
-------------------------------------------------------------
[drm] writeback test succeeded in 2 usecs
BUG: unable to handle kernel NULL pointer dereference at virtual address
00000000
printing eip:
00000000
*pde = 00000000
Oops: 0000 [#1]
PREEMPT
Modules linked in: ecryptfs binfmt_misc cisco_ipsec(P) ipv6 nvram
cpufreq_ondemand ibm_acpi iptable_filter ip_tables x_tables ehci_hcd
ndiswrapper ide_cd cdrom radeonfb fb_ddc i2c_algo_bit i2c_core pcmcia
irtty_sir sir_dev nsc_ircc 8250_pnp parport_pc snd_intel8x0
snd_ac97_codec ac97_bus 8250_pci 8250 yenta_socket rsrc_nonstatic
pcmcia_core serial_core uhci_hcd dm_mod
CPU: 0
EIP: 0060:[<00000000>] Tainted: P VLI
EFLAGS: 00010246 (2.6.21.7 #2)
EIP is at _stext+0x3feff000/0x14
eax: f2b80ec0 ebx: 00000000 ecx: c18625a0 edx: c18625a0
esi: c18625a0 edi: d00686a0 ebp: 00000000 esp: f50ffdfc
ds: 007b es: 007b fs: 00d8 gs: 0033 ss: 0068
Process mkfontscale (pid: 20028, ti=f50fe000 task=f645b5b0 task.ti=f50fe000)
Stack: c013bf4c 000000d0 00000000 f2b80ec0 00000000 f6928094 c18d3360
f9b68bd7
f2b80ec0 c20efb80 00000000 000201d2 c04ce954 f645b5b0 00000000
00000000
f6928094 c18d3360 f9b69635 f9b70737 f9b6e936 f6928094 f6e60d80
f6928128
Call Trace:
[<c013bf4c>] read_cache_page+0x83/0x120
[<f9b68bd7>] ecryptfs_do_readpage+0x36/0xce [ecryptfs]
[<f9b69635>] ecryptfs_readpage+0x69/0x1c0 [ecryptfs]
[<c013a250>] add_to_page_cache+0x33/0xa0
[<c013f9c3>] __do_page_cache_readahead+0x1b2/0x20f
[<f9b66191>] ecryptfs_open_lower_file+0x38/0x6f [ecryptfs]
[<f9b672fb>] ecryptfs_permission+0x3d/0x47 [ecryptfs]
[<f9b664fc>] ecryptfs_open+0x167/0x27d [ecryptfs]
[<c013c384>] filemap_nopage+0x167/0x31f
[<c0256902>] prio_tree_insert+0x1d/0x1e3
[<c0145231>] __handle_mm_fault+0x132/0x864
[<c014242a>] vma_prio_tree_insert+0x17/0x2a
[<c01479a1>] vma_link+0xaa/0xe9
[<c01109b9>] do_page_fault+0x20d/0x4e8
[<c01107ac>] do_page_fault+0x0/0x4e8
[<c03eb87c>] error_code+0x74/0x7c
[<c03e0000>] svc_sendto+0x22d/0x29a
=======================
Code: Bad EIP value.
EIP: [<00000000>] _stext+0x3feff000/0x14 SS:ESP 0068:f50ffdfc
--
Stefan Farestam, PhD Regional Director Customer Marketing, EMEA
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> TIBCO Software Inc.
Stockholm, Sweden
www.tibco.com <http://www.tibco.com> Cell: +46 70 649 6838
--
Stefan Farestam
Mobile: +46 70 649 6838
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