Re: [uml-devel] starting an 32 bit x86 chroot uml image at a ahrdened Gentoo amd64 system fails

["Toralf Förster" <toralf.foerster@gmx.de>]

On 03/21/2015 11:27 PM, Richard Weinberger wrote:
> At least on my PC I can build and run UML with the hardened gcc. But running any UML on a hardened base system (libc) fails badly.

The picture here is the same, gcc isn't the culprit. A vanilla kernel instead of a hardened kernel doesn't help too much too.
Nowadays I do reliable get either a hang or the following at the hardened system, (tomorrow I'll your advices with a grml live cd or something in that direction) : 

...
TCP: cubic registered
NET: Registered protocol family 17
Key type dns_resolver registered
Initialized stdio console driver
Console initialized on /dev/tty0
                                console [tty0] enabled
console [tty0] enabled
                      bootconsole [earlycon0] disabled
bootconsole [earlycon0] disabled
                                Initializing software serial port version 1
console [mc-1] enabled
Netdevice 0 (72:ef:3d:9f:c3:5a) : 
TUN/TAP backend - 
Btrfs loaded
winch_thread : TIOCSCTTY failed on fd 1 err = 1
EXT4-fs (ubda): mounted filesystem with ordered data mode. Opts: (null)
VFS: Mounted root (ext4 filesystem) readonly on device 98:0.
devtmpfs: mounted
Stub registers -
        0 - 0
        1 - 101b7c
        2 - 101afc
        3 - 0
        4 - 0
        5 - 101ae8
        6 - b
        7 - 2b
        8 - 2b
        9 - 0
        10 - 0
        11 - ffffffff
        12 - 1000d9
        13 - 23
        14 - 10206
        15 - 100ad8
        16 - 2b
wait_stub_done : failed to wait for SIGTRAP, pid = 24027, n = 24027, errno = 0, status = 0xb7f
Kernel panic - not syncing: Attempted to kill init! exitcode=0x0000000b

CPU: 0 PID: 1 Comm: init Not tainted 4.0.0-rc4-00241-ge477f3e #10
Stack:
 0855d48a 0855d48a 085be547 00000000 84c9be24 84c94000 84c87ac8 084d80f6
 00000000 84c87aa0 84c87af0 084d4165 08568eac 086a4e00 08569048 84c87b00
 84c94000 84c9be24 84c94000 84d6c948 84c87b30 08112ade 08569048 0000000b
Call Trace:
 [<080f2e26>] show_stack+0xd6/0x1a0
 [<084d80f6>] dump_stack+0x26/0x28
 [<084d4165>] panic+0x8f/0x1a9
 [<08112ade>] do_exit+0xa2e/0xa30
 [<08112b59>] do_group_exit+0x39/0xe0
 [<0811bde9>] get_signal+0x199/0x5a0
 [<084dc32c>] ? _raw_spin_unlock_irqrestore+0x1c/0x20
 [<080f29c6>] kern_do_signal+0x46/0x300
 [<0812cbc0>] ? wake_up_state+0x10/0x20
 [<08119f02>] ? signal_wake_up_state+0x22/0x30
 [<0811a56e>] ? __send_signal.constprop.24+0x11e/0x2f0
 [<0810488a>] ? unblock_signals+0x1a/0xa0
 [<08104bb8>] ? set_signals+0x48/0x60
 [<084dc32c>] ? _raw_spin_unlock_irqrestore+0x1c/0x20
 [<0811b004>] ? force_sig_info+0xa4/0xc0
 [<080f2c9a>] do_signal+0x1a/0x20
 [<080f40e5>] fatal_sigsegv+0x25/0x30
 [<0810741b>] wait_stub_done+0xeb/0x130
 [<081074cd>] get_skas_faultinfo.part.1+0x6d/0x100
 [<081075c5>] get_skas_faultinfo+0x65/0x90
 [<0810cecd>] ? get_fp_registers+0x4d/0x60
 [<08107d5a>] userspace+0x55a/0x650
 [<0819d7f4>] ? do_execve+0x24/0x30
 [<080f04fb>] ? run_init_process+0x2b/0x30
 [<080f050f>] ? try_to_run_init_process+0xf/0x40
 [<0812a632>] ? async_synchronize_full+0x22/0x30
 [<084d3cd2>] ? kernel_init+0x92/0xd0
 [<080f1a22>] new_thread_handler+0x82/0x90

/home/tfoerste/workspace/bin/start_uml.sh: line 104: 23974 Aborted                 $STRACE $LINUX earlyprintk ubda=$ROOTFS ubdb=$SWAP eth0=$NET mem=$MEM $TTY umid=uml_$NAME rootfstype=ext4 "$ARGS"
                                                                                            + rc=134
                                                                                                    + rm -f /mnt/ramdisk/trinity_swap
                             + [[ 134 -ne 0 ]]
                                              ++ expr 134 % 128
                                                               + RC=6
                                                                     + reset

-- 
Toralf
pgp key: 7B1A 07F4 EC82 0F90 D4C2  8936 872A E508 0076 E94E


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