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    Subject[117/136] /proc/kcore: work around a BUG()

    2.6.31-stable review patch. If anyone has any objections, please let us know.

    ------------------
    From: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>

    Not upstream due to other fixes in .32


    Works around a BUG() which is triggered when the kernel accesses holes in
    vmalloc regions.

    BUG: unable to handle kernel paging request at fa54c000
    IP: [<c04f687a>] read_kcore+0x260/0x31a
    *pde = 3540b067 *pte = 00000000
    Oops: 0000 [#1] SMP
    last sysfs file: /sys/devices/pci0000:00/0000:00:1c.2/0000:03:00.0/ieee80211/phy0/rfkill0/state
    Modules linked in: fuse sco bridge stp llc bnep l2cap bluetooth sunrpc nf_conntrack_ftp ip6t_REJECT nf_conntrack_ipv6 ip6table_filter ip6_tables ipv6 cpufreq_ondemand acpi_cpufreq dm_multipath uinput usb_storage arc4 ecb snd_hda_codec_realtek snd_hda_intel ath5k snd_hda_codec snd_hwdep iTCO_wdt snd_pcm iTCO_vendor_support pcspkr i2c_i801 mac80211 joydev snd_timer serio_raw r8169 snd soundcore mii snd_page_alloc ath cfg80211 ata_generic i915 drm i2c_algo_bit i2c_core video output [last unloaded: scsi_wait_scan]
    Sep 4 12:45:16 tuxedu kernel: Pid: 2266, comm: cat Not tainted (2.6.31-rc8 #2) Joybook Lite U101
    EIP: 0060:[<c04f687a>] EFLAGS: 00010286 CPU: 0
    EIP is at read_kcore+0x260/0x31a
    EAX: f5e5ea00 EBX: fa54d000 ECX: 00000400 EDX: 00001000
    ESI: fa54c000 EDI: f44ad000 EBP: e4533f4c ESP: e4533f24
    DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
    Process cat (pid: 2266, ti=e4532000 task=f09d19a0 task.ti=e4532000)
    Stack:
    00005000 00000000 f44ad000 09d9c000 00003000 fa54c000 00001000 f6d16f60
    e4520b80 fffffffb e4533f70 c04ef8eb e4533f98 00008000 09d97000 c04f661a
    e4520b80 09d97000 c04ef88c e4533f8c c04ba531 e4533f98 c04c0930 e4520b80
    Call Trace:
    [<c04ef8eb>] ? proc_reg_read+0x5f/0x73
    [<c04f661a>] ? read_kcore+0x0/0x31a
    [<c04ef88c>] ? proc_reg_read+0x0/0x73
    [<c04ba531>] ? vfs_read+0x82/0xe1
    [<c04c0930>] ? path_put+0x1a/0x1d
    [<c04ba62e>] ? sys_read+0x40/0x62
    [<c0403298>] ? sysenter_do_call+0x12/0x2d
    Code: 39 f3 89 ca 0f 43 f3 89 fb 29 f2 29 f3 39 cf 0f 46 d3 29 55 dc 8d 1c 32 f6 40 0c 01 75 18 89 d1 89 f7 c1 e9 02 2b 7d ec 03 7d e0 <f3> a5 89 d1 83 e1 03 74 02 f3 a4 8b 00 83 7d dc 00 74 04 85 c0
    EIP: [<c04f687a>] read_kcore+0x260/0x31a SS:ESP 0068:e4533f24
    CR2: 00000000fa54c000


    To access vmalloc area which may have memory holes, copy_from_user is
    useful. So this:

    # cat /proc/kcore > /dev/null

    will not panic.

    This is a minimal fix, suitable for 2.6.30.x and 2.6.31. More extensive
    /proc/kcore changes are planned for 2.6.32.

    Signed-off-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    Tested-by: Nick Craig-Wood <nick@craig-wood.com>
    Cc: Pekka Enberg <penberg@cs.helsinki.fi>
    Reported-by: <kbowa@tuxedu.org>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

    ---
    fs/proc/kcore.c | 8 +++++++-
    1 file changed, 7 insertions(+), 1 deletion(-)

    --- a/fs/proc/kcore.c
    +++ b/fs/proc/kcore.c
    @@ -361,7 +361,13 @@ read_kcore(struct file *file, char __use
    /* don't dump ioremap'd stuff! (TA) */
    if (m->flags & VM_IOREMAP)
    continue;
    - memcpy(elf_buf + (vmstart - start),
    + /*
    + * we may access memory holes, then use
    + * ex_table. checking return value just for
    + * avoid warnings.
    + */
    + vmsize = __copy_from_user_inatomic(
    + elf_buf + (vmstart - start),
    (char *)vmstart, vmsize);
    }
    read_unlock(&vmlist_lock);



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