encrypted swap on loop in 2.4.10-pre12?

encrypted swap on loop in 2.4.10-pre12?

[steve j. kondik]

[-- Attachment #1: Type: text/plain, Size: 2052 bytes --]

i've been using encrypted swap over loopdev using the new cryptoapi
patches.  i just built a 2.4.10-pre12 kernel and i got a panic doing
mkswap on the loopdev.  the mkswap process becomes unkillable after this
and never finishes.  this is repeatable everytime.  i've had no problems
whatsoever until this kernel even under high load..  any ideas? :>

Sep 19 11:06:13 discord kernel: Unabl
Sep 19 11:06:13 discord kernel: e to handle kernel NULL pointer
dereference at virtual address 00000000
Sep 19 11:06:13 discord kernel:  printing eip:
Sep 19 11:06:13 discord kernel: 00000000
Sep 19 11:06:13 discord kernel: *pde = 0f444067
Sep 19 11:06:13 discord kernel: *pte = 00000000
Sep 19 11:06:13 discord kernel: Oops: 0000
Sep 19 11:06:13 discord kernel: CPU:    0
Sep 19 11:06:13 discord kernel: EIP:    0010:[<00000000>]
Sep 19 11:06:13 discord kernel: EFLAGS: 00010206
Sep 19 11:06:13 discord kernel: eax: c02fbca0   ebx: cf47d000   ecx:
00000400   edx: cfb428c0
Sep 19 11:06:13 discord kernel: esi: 00001000   edi: 00000c00   ebp:
c1394d78   esp: cf447efc
Sep 19 11:06:13 discord kernel: ds: 0018   es: 0018   ss: 0018
Sep 19 11:06:13 discord kernel: Process mkswap (pid: 9902,
stackpage=cf447000)
Sep 19 11:06:13 discord kernel: Stack: c012a371 cfb428c0 c1394d78
00000400 00001000 cfcd61b0 001828c4 00000000 
Sep 19 11:06:13 discord kernel:        00000000 00001000 00000400
00000c00 fffffff4 00000000 00000400 00000000 
Sep 19 11:06:13 discord kernel:        cfa9210c cfa92060 00000000
c01a1ba0 00126000 00001000 00000003 32000022 
Sep 19 11:06:13 discord kernel: Call Trace: [<c012a371>] [<c01a1ba0>]
[<c01359c0>] [<c01357fe>] [<c0106ebb>] 
Sep 19 11:06:13 discord kernel: 
Sep 19 11:06:13 discord kernel: Code:  Bad EIP value.
Sep 19 11:06:13 discord kernel:  Unable to find swap-space signature

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[-- Attachment #2: Type: application/pgp-signature, Size: 232 bytes --]

Re: encrypted swap on loop in 2.4.10-pre12?

[Jens Axboe]

On Wed, Sep 19 2001, steve j. kondik wrote:
> i've been using encrypted swap over loopdev using the new cryptoapi
> patches.  i just built a 2.4.10-pre12 kernel and i got a panic doing
> mkswap on the loopdev.  the mkswap process becomes unkillable after this
> and never finishes.  this is repeatable everytime.  i've had no problems
> whatsoever until this kernel even under high load..  any ideas? :>
> 
> Sep 19 11:06:13 discord kernel: Unabl
> Sep 19 11:06:13 discord kernel: e to handle kernel NULL pointer
> dereference at virtual address 00000000
> Sep 19 11:06:13 discord kernel:  printing eip:
> Sep 19 11:06:13 discord kernel: 00000000
> Sep 19 11:06:13 discord kernel: *pde = 0f444067
> Sep 19 11:06:13 discord kernel: *pte = 00000000
> Sep 19 11:06:13 discord kernel: Oops: 0000
> Sep 19 11:06:13 discord kernel: CPU:    0
> Sep 19 11:06:13 discord kernel: EIP:    0010:[<00000000>]
> Sep 19 11:06:13 discord kernel: EFLAGS: 00010206
> Sep 19 11:06:13 discord kernel: eax: c02fbca0   ebx: cf47d000   ecx:
> 00000400   edx: cfb428c0
> Sep 19 11:06:13 discord kernel: esi: 00001000   edi: 00000c00   ebp:
> c1394d78   esp: cf447efc
> Sep 19 11:06:13 discord kernel: ds: 0018   es: 0018   ss: 0018
> Sep 19 11:06:13 discord kernel: Process mkswap (pid: 9902,
> stackpage=cf447000)
> Sep 19 11:06:13 discord kernel: Stack: c012a371 cfb428c0 c1394d78
> 00000400 00001000 cfcd61b0 001828c4 00000000 
> Sep 19 11:06:13 discord kernel:        00000000 00001000 00000400
> 00000c00 fffffff4 00000000 00000400 00000000 
> Sep 19 11:06:13 discord kernel:        cfa9210c cfa92060 00000000
> c01a1ba0 00126000 00001000 00000003 32000022 
> Sep 19 11:06:13 discord kernel: Call Trace: [<c012a371>] [<c01a1ba0>]
> [<c01359c0>] [<c01357fe>] [<c0106ebb>] 
> Sep 19 11:06:13 discord kernel: 
> Sep 19 11:06:13 discord kernel: Code:  Bad EIP value.
> Sep 19 11:06:13 discord kernel:  Unable to find swap-space signature

ksymoops it please

-- 
Jens Axboe

Re: encrypted swap on loop in 2.4.10-pre12?

[steve j. kondik]

[-- Attachment #1: Type: text/plain, Size: 3869 bytes --]

read in the wrong file.  here it is:

Sep 19 13:15:09 discord kernel: Unable to handle kernel NULL pointer
dereference at virtual 
Sep 19 13:15:09 discord kernel: 00000000
Sep 19 13:15:09 discord kernel: *pde = 0f602067
Sep 19 13:15:09 discord kernel: Oops: 0000
Sep 19 13:15:09 discord kernel: CPU:    0
Sep 19 13:15:09 discord kernel: EIP:    0010:[<00000000>]
Using defaults from ksymoops -t elf32-i386 -a i386
Sep 19 13:15:09 discord kernel: EFLAGS: 00010206
Sep 19 13:15:09 discord kernel: eax: c02fbca0   ebx: cf613000   ecx:
00000400   edx: cfb428c0
Sep 19 13:15:09 discord kernel: esi: 00001000   edi: 00000c00   ebp:
c139aca0   esp: cf605efc
Sep 19 13:15:09 discord kernel: ds: 0018   es: 0018   ss: 0018
Sep 19 13:15:09 discord kernel: Process mkswap (pid: 5695,
stackpage=cf605000)
Sep 19 13:15:09 discord kernel: Stack: c012a371 cfb428c0 c139aca0
00000400 00001000 cfcd61b0 001828c4 00000000 
Sep 19 13:15:09 discord kernel:        00000000 00001000 00000400
00000c00 fffffff4 00000000 00000400 00000000 
Sep 19 13:15:09 discord kernel:        cfa9210c cfa92060 00000000
c01a1ba0 00126000 00001000 00000003 32000022 
Sep 19 13:15:09 discord kernel: Call Trace: [<c012a371>] [<c01a1ba0>]
[<c01359c0>] [<c01357fe>] [<c0106ebb>] 
Sep 19 13:15:09 discord kernel: Code:  Bad EIP value.

>>EIP; 00000000 Before first symbol
Trace; c012a370 <generic_file_write+410/810>
Trace; c01a1ba0 <write_chan+0/1c0>
Trace; c01359c0 <sys_write+b0/d0>
Trace; c01357fe <sys_llseek+fe/140>
Trace; c0106eba <system_call+32/38>


On Wed, 2001-09-19 at 11:37, Jens Axboe wrote:
> On Wed, Sep 19 2001, steve j. kondik wrote:
> > i've been using encrypted swap over loopdev using the new cryptoapi
> > patches.  i just built a 2.4.10-pre12 kernel and i got a panic doing
> > mkswap on the loopdev.  the mkswap process becomes unkillable after this
> > and never finishes.  this is repeatable everytime.  i've had no problems
> > whatsoever until this kernel even under high load..  any ideas? :>
> > 
> > Sep 19 11:06:13 discord kernel: Unabl
> > Sep 19 11:06:13 discord kernel: e to handle kernel NULL pointer
> > dereference at virtual address 00000000
> > Sep 19 11:06:13 discord kernel:  printing eip:
> > Sep 19 11:06:13 discord kernel: 00000000
> > Sep 19 11:06:13 discord kernel: *pde = 0f444067
> > Sep 19 11:06:13 discord kernel: *pte = 00000000
> > Sep 19 11:06:13 discord kernel: Oops: 0000
> > Sep 19 11:06:13 discord kernel: CPU:    0
> > Sep 19 11:06:13 discord kernel: EIP:    0010:[<00000000>]
> > Sep 19 11:06:13 discord kernel: EFLAGS: 00010206
> > Sep 19 11:06:13 discord kernel: eax: c02fbca0   ebx: cf47d000   ecx:
> > 00000400   edx: cfb428c0
> > Sep 19 11:06:13 discord kernel: esi: 00001000   edi: 00000c00   ebp:
> > c1394d78   esp: cf447efc
> > Sep 19 11:06:13 discord kernel: ds: 0018   es: 0018   ss: 0018
> > Sep 19 11:06:13 discord kernel: Process mkswap (pid: 9902,
> > stackpage=cf447000)
> > Sep 19 11:06:13 discord kernel: Stack: c012a371 cfb428c0 c1394d78
> > 00000400 00001000 cfcd61b0 001828c4 00000000 
> > Sep 19 11:06:13 discord kernel:        00000000 00001000 00000400
> > 00000c00 fffffff4 00000000 00000400 00000000 
> > Sep 19 11:06:13 discord kernel:        cfa9210c cfa92060 00000000
> > c01a1ba0 00126000 00001000 00000003 32000022 
> > Sep 19 11:06:13 discord kernel: Call Trace: [<c012a371>] [<c01a1ba0>]
> > [<c01359c0>] [<c01357fe>] [<c0106ebb>] 
> > Sep 19 11:06:13 discord kernel: 
> > Sep 19 11:06:13 discord kernel: Code:  Bad EIP value.
> > Sep 19 11:06:13 discord kernel:  Unable to find swap-space signature
> 
> ksymoops it please
> 
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[-- Attachment #2: Type: application/pgp-signature, Size: 232 bytes --]

Re: encrypted swap on loop in 2.4.10-pre12?

[Jari Ruusu]

"steve j. kondik" wrote:
> i've been using encrypted swap over loopdev using the new cryptoapi
> patches.  i just built a 2.4.10-pre12 kernel and i got a panic doing
> mkswap on the loopdev.  the mkswap process becomes unkillable after this
> and never finishes.  this is repeatable everytime.  i've had no problems
> whatsoever until this kernel even under high load..  any ideas? :>

Cryptoapi can't be used to encrypt swap. It has nasties like sleeping in
make_request_fn() and potential memory allocation deadlock.

loop-AES works with encrypted swap. Announcement is here:

    http://mail.nl.linux.org/linux-crypto/2001-09/msg00006.html
    http://marc.theaimsgroup.com/?l=linux-crypto&m=99953544804810&w=2

Regards,
Jari Ruusu <jari.ruusu@pp.inet.fi>

Re: encrypted swap on loop in 2.4.10-pre12?

[Jens Axboe]

On Thu, Sep 20 2001, Jari Ruusu wrote:
> "steve j. kondik" wrote:
> > i've been using encrypted swap over loopdev using the new cryptoapi
> > patches.  i just built a 2.4.10-pre12 kernel and i got a panic doing
> > mkswap on the loopdev.  the mkswap process becomes unkillable after this
> > and never finishes.  this is repeatable everytime.  i've had no problems
> > whatsoever until this kernel even under high load..  any ideas? :>
> 
> Cryptoapi can't be used to encrypt swap. It has nasties like sleeping in
> make_request_fn() and potential memory allocation deadlock.

sleeping in make_request_fn is not a nasty in itself, btw. in fact loop
just needs an emergency page pool for swap to be perfectly safe.

-- 
Jens Axboe

Re: encrypted swap on loop in 2.4.10-pre12?

[Jari Ruusu]

Jens Axboe wrote:
> On Thu, Sep 20 2001, Jari Ruusu wrote:
> > Cryptoapi can't be used to encrypt swap. It has nasties like sleeping in
> > make_request_fn() and potential memory allocation deadlock.
> 
> sleeping in make_request_fn is not a nasty in itself, btw. in fact loop
> just needs an emergency page pool for swap to be perfectly safe.

loop-AES provides emergency page pool for device backed loop. Take a look.

Regards,
Jari Ruusu <jari.ruusu@pp.inet.fi>

Re: encrypted swap on loop in 2.4.10-pre12?

[Jens Axboe]

On Thu, Sep 20 2001, Jari Ruusu wrote:
> Jens Axboe wrote:
> > On Thu, Sep 20 2001, Jari Ruusu wrote:
> > > Cryptoapi can't be used to encrypt swap. It has nasties like sleeping in
> > > make_request_fn() and potential memory allocation deadlock.
> > 
> > sleeping in make_request_fn is not a nasty in itself, btw. in fact loop
> > just needs an emergency page pool for swap to be perfectly safe.
> 
> loop-AES provides emergency page pool for device backed loop. Take a look.

Then sleeping in make_request_fn is not a nasty at all. In fact the
kernel does it all the time anyways.

-- 
Jens Axboe

Re: encrypted swap on loop in 2.4.10-pre12?

[steve j. kondik]

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loop-aes does not work to encrypt swap using 2.4.10-pre12.  the same
panic results during mkswap.

On Thu, 2001-09-20 at 08:25, Jens Axboe wrote:
> On Thu, Sep 20 2001, Jari Ruusu wrote:
> > Jens Axboe wrote:
> > > On Thu, Sep 20 2001, Jari Ruusu wrote:
> > > > Cryptoapi can't be used to encrypt swap. It has nasties like sleeping in
> > > > make_request_fn() and potential memory allocation deadlock.
> > > 
> > > sleeping in make_request_fn is not a nasty in itself, btw. in fact loop
> > > just needs an emergency page pool for swap to be perfectly safe.
> > 
> > loop-AES provides emergency page pool for device backed loop. Take a look.
> 
> Then sleeping in make_request_fn is not a nasty at all. In fact the
> kernel does it all the time anyways.
> 
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Re: encrypted swap on loop in 2.4.10-pre12?

[Jari Ruusu]

"steve j. kondik" wrote:
> loop-aes does not work to encrypt swap using 2.4.10-pre12.  the same
> panic results during mkswap.

Did you remove _any_ of the kernel compile time generated files from kernel
source tree? Some of those generated files are _required_ to correctly
compile modules.

Regards,
Jari Ruusu <jari.ruusu@pp.inet.fi>

Re: encrypted swap on loop in 2.4.10-pre12?

[steve j. kondik]

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hmm?  both cryptoapi and loop-aes work just fine when encrypting
anything but swap.  this is _only_ with kernel 2.4.10-pre12.  i would
suspect something changed that breaks swap on loopdev in general in this
kernel.

-steve

On Thu, 2001-09-20 at 13:04, Jari Ruusu wrote:
> "steve j. kondik" wrote:
> > loop-aes does not work to encrypt swap using 2.4.10-pre12.  the same
> > panic results during mkswap.
> 
> Did you remove _any_ of the kernel compile time generated files from kernel
> source tree? Some of those generated files are _required_ to correctly
> compile modules.
> 
> Regards,
> Jari Ruusu <jari.ruusu@pp.inet.fi>
> 
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Re: encrypted swap on loop in 2.4.10-pre12?

[Jari Ruusu]

"steve j. kondik" wrote:
> hmm?  both cryptoapi and loop-aes work just fine when encrypting
> anything but swap.  this is _only_ with kernel 2.4.10-pre12.  i would
> suspect something changed that breaks swap on loopdev in general in this
> kernel.

loop-AES encrypted swap works just fine on 2.4.10-pre12, see:

# uname -a
Linux debian 2.4.10-pre12 #1 Thu Sep 20 20:15:08 EEST 2001 i686 unknown
# vmstat 
   procs                      memory    swap          io     system         cpu
 r  b  w   swpd   free   buff  cache  si  so    bi    bo   in    cs  us  sy  id
 0  0  1   4708   2708   1824  12856  19  28   682   623  223   119   5  74  21
# swapon -s
Filename                        Type            Size    Used    Priority
/dev/loop6                      partition       191512  4704    -1
# losetup /dev/loop6
/dev/loop6: [0301]:170184 (/dev/hda2) offset 0, AES encryption

Regards,
Jari Ruusu <jari.ruusu@pp.inet.fi>

Re: encrypted swap on loop in 2.4.10-pre12?

[Michael H. Warfield]

On Thu, Sep 20, 2001 at 08:55:11PM +0300, Jari Ruusu wrote:
> "steve j. kondik" wrote:
> > hmm?  both cryptoapi and loop-aes work just fine when encrypting
> > anything but swap.  this is _only_ with kernel 2.4.10-pre12.  i would
> > suspect something changed that breaks swap on loopdev in general in this
> > kernel.

> loop-AES encrypted swap works just fine on 2.4.10-pre12, see:

	But that's only your system.  He obvious has a counter example
(which may not be the fault of loop-AES, but something else, that has
yet to be determined).  So the two of you are now reduced to figuring
out why his is broken as yours is not.  Standard debugging situation.

> # uname -a
> Linux debian 2.4.10-pre12 #1 Thu Sep 20 20:15:08 EEST 2001 i686 unknown
> # vmstat 
>    procs                      memory    swap          io     system         cpu
>  r  b  w   swpd   free   buff  cache  si  so    bi    bo   in    cs  us  sy  id
>  0  0  1   4708   2708   1824  12856  19  28   682   623  223   119   5  74  21
> # swapon -s
> Filename                        Type            Size    Used    Priority
> /dev/loop6                      partition       191512  4704    -1
> # losetup /dev/loop6
> /dev/loop6: [0301]:170184 (/dev/hda2) offset 0, AES encryption

> Regards,
> Jari Ruusu <jari.ruusu@pp.inet.fi>

	Mike
-- 
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Re: encrypted swap on loop in 2.4.10-pre12?

[steve j. kondik]

[-- Attachment #1: Type: text/plain, Size: 2645 bytes --]

agreed.  i've had this problem on two seperate systems, however i _am_
running a few other patches- notably the kpreempt patch.  but again, no
problems at all until 2.4.10-pre12.  i'll try some things in the morning
and see what i can come up with.  i see you are doing swapon, however
have you tried mkswap over your loopdev?  i can actually swapon just
fine, its mkswap that causes the panic.  


On Thu, 2001-09-20 at 14:59, Michael H. Warfield wrote:
> On Thu, Sep 20, 2001 at 08:55:11PM +0300, Jari Ruusu wrote:
> > "steve j. kondik" wrote:
> > > hmm?  both cryptoapi and loop-aes work just fine when encrypting
> > > anything but swap.  this is _only_ with kernel 2.4.10-pre12.  i would
> > > suspect something changed that breaks swap on loopdev in general in this
> > > kernel.
> 
> > loop-AES encrypted swap works just fine on 2.4.10-pre12, see:
> 
> 	But that's only your system.  He obvious has a counter example
> (which may not be the fault of loop-AES, but something else, that has
> yet to be determined).  So the two of you are now reduced to figuring
> out why his is broken as yours is not.  Standard debugging situation.
> 
> > # uname -a
> > Linux debian 2.4.10-pre12 #1 Thu Sep 20 20:15:08 EEST 2001 i686 unknown
> > # vmstat 
> >    procs                      memory    swap          io     system         cpu
> >  r  b  w   swpd   free   buff  cache  si  so    bi    bo   in    cs  us  sy  id
> >  0  0  1   4708   2708   1824  12856  19  28   682   623  223   119   5  74  21
> > # swapon -s
> > Filename                        Type            Size    Used    Priority
> > /dev/loop6                      partition       191512  4704    -1
> > # losetup /dev/loop6
> > /dev/loop6: [0301]:170184 (/dev/hda2) offset 0, AES encryption
> 
> > Regards,
> > Jari Ruusu <jari.ruusu@pp.inet.fi>
> 
> 	Mike
> -- 
>  Michael H. Warfield    |  (770) 985-6132   |  mhw@WittsEnd.com
>   (The Mad Wizard)      |  (678) 463-0932   |  http://www.wittsend.com/mhw/
>   NIC whois:  MHW9      |  An optimist believes we live in the best of all
>  PGP Key: 0xDF1DD471    |  possible worlds.  A pessimist is sure of it!
> 
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[-- Attachment #2: Type: application/pgp-signature, Size: 232 bytes --]

Re: encrypted swap on loop in 2.4.10-pre12?

[Jari Ruusu]

"steve j. kondik" wrote:
> agreed.  i've had this problem on two seperate systems, however i _am_
> running a few other patches- notably the kpreempt patch.  but again, no
> problems at all until 2.4.10-pre12.  i'll try some things in the morning
> and see what i can come up with.  i see you are doing swapon, however
> have you tried mkswap over your loopdev?  i can actually swapon just
> fine, its mkswap that causes the panic.

I losetup the encrypted swap loop with a random key every time the box
boots, so mkswap is done before swapon. I used the example script in the
loop-AES README file.

For testing purposes, can you back out the kpreempt patch, and let me know
if that cures the problem.

Regards,
Jari Ruusu <jari.ruusu@pp.inet.fi>

Re: encrypted swap on loop in 2.4.10-pre12?

[steve j. kondik]

[-- Attachment #1: Type: text/plain, Size: 1424 bytes --]

i am successfully running 2.4.10-pre13 with kpreempt, grsec, and ext3
with encrypted swap now.


On Fri, 2001-09-21 at 05:15, Jari Ruusu wrote:
> "steve j. kondik" wrote:
> > agreed.  i've had this problem on two seperate systems, however i _am_
> > running a few other patches- notably the kpreempt patch.  but again, no
> > problems at all until 2.4.10-pre12.  i'll try some things in the morning
> > and see what i can come up with.  i see you are doing swapon, however
> > have you tried mkswap over your loopdev?  i can actually swapon just
> > fine, its mkswap that causes the panic.
> 
> I losetup the encrypted swap loop with a random key every time the box
> boots, so mkswap is done before swapon. I used the example script in the
> loop-AES README file.
> 
> For testing purposes, can you back out the kpreempt patch, and let me know
> if that cures the problem.
> 
> Regards,
> Jari Ruusu <jari.ruusu@pp.inet.fi>
> 
> -
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