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    SubjectStackProtector Oopses - Re: 2.6.25-mm1

    On 18/04/2008 6:47 PM, Andrew Morton wrote:
    > ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.25/2.6.25-mm1/

    The GCC stackprotector option is a no-go for me, and causes 100% repeatable
    fatal oopses on boot with my x86_64 box.

    This is not new to 2.6.25-mm1 - but was also present in 2.6.24-rc8-mm2
    (2.6.24-rc8-mm1 was good, but this option didn't exist then).

    It seems that enabling the stackprotector option:

    tornado boot # diff -u config-2.6.25-mm1 config-2.6.25-mm1.old
    --- config-2.6.25-mm1 2008-04-18 22:40:15.000000000 +1000
    +++ config-2.6.25-mm1.old 2008-04-18 20:09:38.000000000 +1000
    @@ -1,7 +1,7 @@
    #
    # Automatically generated make config: don't edit
    # Linux kernel version: 2.6.25-mm1
    -# Fri Apr 18 22:25:04 2008
    +# Fri Apr 18 19:57:17 2008
    #
    CONFIG_64BIT=y
    # CONFIG_X86_32 is not set
    @@ -256,7 +256,8 @@
    CONFIG_X86_PAT=y
    # CONFIG_EFI is not set
    CONFIG_SECCOMP=y
    -# CONFIG_CC_STACKPROTECTOR is not set
    +CONFIG_CC_STACKPROTECTOR_ALL=y
    +CONFIG_CC_STACKPROTECTOR=y
    # CONFIG_HZ_100 is not set
    # CONFIG_HZ_250 is not set
    CONFIG_HZ_300=y
    is enough to prevent my system booting, viz:

    input: Belkin Components Belkin OmniView KVM Switch as
    /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1.1/3-1.1:1.0/input/input2
    input: USB HID v1.00 Keyboard [Belkin Components Belkin OmniView KVM Switch] on
    usb-0000:00:1d.1-1.1
    input: Belkin Components Belkin OmniView KVM Switch as
    /devices/pci0000:00/0000:00:1d.1/usb3/3-1/3-1.1/3-1.1:1.1/input/input3
    input: USB HID v1.00 Mouse [Belkin Components Belkin OmniView KVM Switch] on
    usb-0000:00:1d.1-1.1
    usbcore: registered new interface driver usbhid
    usbhid: v2.6:USB HID core driver
    TCP bic registered
    NET: Registered protocol family 1
    NET: Registered protocol family 10
    lo: Disabled Privacy Extensions
    NET: Registered protocol family 17
    Testing -fstack-protector-all feature
    ------------[ cut here ]------------
    WARNING: at ™š:-2145164734 0x0()
    Modules linked in:
    Pid: 1, comm: swapper Not tainted 2.6.25-mm1 #1
    Call Trace:
    [<ffffffff802362a9>] warn_on_slowpath+0x67/0x98
    [<ffffffff802f31da>] ? proc_register+0x104/0x1b0
    [<ffffffff80237e2a>] ? printk+0x79/0x94
    [<ffffffff804f1d05>] ? register_netdevice_notifier+0xed/0x1c9
    [<ffffffff8023da80>] ? insert_resource+0x3c/0x117
    [<ffffffff8023630d>] ? __stack_chk_test+0x33/0x7b
    [<ffffffff80740ff0>] ? kernel_init+0x16d/0x30d
    [<ffffffff8020c7b8>] ? child_rip+0xa/0x12
    [<ffffffff80740e83>] ? kernel_init+0x0/0x30d
    [<ffffffff8020c7ae>] ? child_rip+0x0/0x12
    ---[ end trace 8d584356702633c0 ]---
    BUG: unable to handle kernel NULL pointer dereference at 0000000000000000
    IP: [<0000000000000000>]
    PGD 0
    Oops: 0010 [1] SMP
    last sysfs file:
    CPU 0
    Modules linked in:
    Pid: 1, comm: swapper Tainted: G W 2.6.25-mm1 #1
    RIP: 0010:[<0000000000000000>] [<0000000000000000>]
    RSP: 0000:ffff8100bf05de88 EFLAGS: 00010296
    RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
    RDX: 0000000000000000 RSI: 0000000000000046 RDI: 0000000000000200
    RBP: ffff8100bf05de90 R08: 0000000000000000 R09: ffff8100000bcce0
    R10: 0720072007200720 R11: 0720072007200720 R12: 0000000000000000
    R13: ffffffff80787530 R14: 0000000000000000 R15: ffffffff8067fd3c
    FS: 0000000000000000(0000) GS:ffffffff80721000(0000) knlGS:0000000000000000
    CS: 0010 DS: 0018 ES: 0018 CR0: 000000008005003b
    CR2: 0000000000000000 CR3: 0000000000201000 CR4: 00000000000006e0
    DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
    DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
    Process swapper (pid: 1, threadinfo ffff8100bf05c000, task ffff8100bf060000)
    Stack: 0000000000000000 ffff8100bf05deb0 ffffffff8023630d 0000000000000000
    0000000090e2a955 ffff8100bf05df40 ffffffff80740ff0 aa55aa0000000000
    aa55aa55aa55aa55 0000000000000003 55aa55aa55aa55aa 55aa55aa55aa55aa
    Call Trace:
    [<ffffffff8023630d>] __stack_chk_test+0x33/0x7b
    [<ffffffff80740ff0>] kernel_init+0x16d/0x30d
    [<ffffffff8020c7b8>] child_rip+0xa/0x12
    [<ffffffff80740e83>] ? kernel_init+0x0/0x30d
    [<ffffffff8020c7ae>] ? child_rip+0x0/0x12

    Code: Bad RIP value.
    RIP [<0000000000000000>]
    RSP <ffff8100bf05de88>
    CR2: 0000000000000000
    ---[ end trace 8d584356702633c0 ]---
    Kernel panic - not syncing: Attempted to kill init!
    Pid: 1, comm: swapper Tainted: G D W 2.6.25-mm1 #1
    Call Trace:
    [<ffffffff80236716>] panic+0xb2/0x187
    [<ffffffff802547c7>] ? blocking_notifier_call_chain+0x24/0x42
    [<ffffffff8023a5b7>] do_exit+0x772/0x7eb
    [<ffffffff8020cd1f>] oops_end+0x9a/0x9f
    [<ffffffff80224349>] do_page_fault+0x61d/0x7c4
    [<ffffffff802f31da>] ? proc_register+0x104/0x1b0
    [<ffffffff805a51f9>] error_exit+0x0/0x51
    [<ffffffff8023630d>] ? __stack_chk_test+0x33/0x7b
    [<ffffffff80740ff0>] ? kernel_init+0x16d/0x30d
    [<ffffffff8020c7b8>] ? child_rip+0xa/0x12
    [<ffffffff80740e83>] ? kernel_init+0x0/0x30d
    [<ffffffff8020c7ae>] ? child_rip+0x0/0x12
    Rebooting in 30 seconds..
    ----------
    gcc version 4.2.3 (Gentoo 4.2.3 p1.0)

    I have put the config and full dmesg of 2.6.25-mm1 both working and not working,
    up at http://www.reub.net/files/kernel/2.6.25-mm1/

    It is the exact same oops with 2.6.24-rc8-mm1.

    Reuben

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