Bug#820008: fixed in linux 4.5.1-1
On Thu, 14 Apr 2016 15:00:55 +0000 Ben Hutchings wrote:
> Source: linux
> Source-Version: 4.5.1-1
>
> We believe that the bug you reported is fixed in the latest version of
> linux, which is due to be installed in the Debian FTP archive.
>
Hello,
As far as I tested, I believe the bug is incorrectly fixed. The modules
are not signed and fails to load with secureboot. insmod fails to load
modules with "required key not available" error message.
# hexdump -C /lib/modules/4.5.0-1-amd64//kernel/drivers/ata/ahci.ko | tail
00011560 00 00 00 00 00 00 00 00 01 00 00 00 02 00 00 00 |................|
00011570 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
00011580 60 ad 00 00 00 00 00 00 d8 27 00 00 00 00 00 00 |`........'......|
00011590 1d 00 00 00 59 01 00 00 08 00 00 00 00 00 00 00 |....Y...........|
000115a0 18 00 00 00 00 00 00 00 09 00 00 00 03 00 00 00 |................|
000115b0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................|
000115c0 38 d5 00 00 00 00 00 00 7b 1f 00 00 00 00 00 00 |8.......{.......|
000115d0 00 00 00 00 00 00 00 00 01 00 00 00 00 00 00 00 |................|
This should read a signature like:
# hexdump -C /lib/modules/4.6.0-rc4/kernel/drivers/ata/ahci.ko | tail
000118c0 1b 82 ea 02 4a d3 0d a7 00 8d 3e ab 7a f0 b2 0b |....J.....>.z...|
000118d0 00 48 0d 2d 0e f4 af fb 6d 36 2d 48 c7 8e ec fa |.H.-....m6-H....|
000118e0 f2 62 49 18 84 a8 4e d3 79 9d 86 01 44 27 ad c0 |.bI...N.y...D'..|
000118f0 66 24 fc eb bb 6f de 1f df b1 79 70 a8 22 35 2e |f$...o....yp."5.|
00011900 bf a1 03 5f 1e 71 0f 03 8b d7 b1 3a 33 60 b1 61 |..._.q.....:3`.a|
00011910 81 c3 1a d3 e5 17 13 3c 86 71 74 23 d8 9b c2 6f |.......<.qt#...o|
00011920 f6 1d 00 00 02 00 00 00 00 00 00 00 02 82 7e 4d |..............~M|
00011930 6f 64 75 6c 65 20 73 69 67 6e 61 74 75 72 65 20 |odule signature |
00011940 61 70 70 65 6e 64 65 64 7e 0a |appended~.|
This may be cause by two reasons:
1/ required config is missing (CONFIG_MODULE_SIG_KEY)
I believe this settings should point to a file containing both
private key and public key in PEM format.
2/ modules get stripped
from https://www.kernel.org/doc/Documentation/module-signing.txt
============================
SIGNED MODULES AND STRIPPING
============================
A signed module has a digital signature simply appended at the end. The string
"~Module signature appended~." at the end of the module's file confirms that a
signature is present but it does not confirm that the signature is valid!
Signed modules are BRITTLE as the signature is outside of the defined ELF
container. Thus they MAY NOT be stripped once the signature is computed and
attached. Note the entire module is the signed payload, including any and all
debug information present at the time of signing.
--
\o/ Arthur
G Gandi.net
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