lkml.org 
[lkml]   [2005]   [Nov]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Date
    From
    SubjectRe: Linux 2.6.15-rc3
    Michael Krufky wrote:

    > Unable to handle kernel NULL pointer dereference at virtual address

    > EFLAGS: 00010202 (2.6.15-rc3) EIP is at vm_normal_page+0x17/0x60

    > Process gdb (pid: 5628, threadinfo=f488e000 task=f7239a30)

    > [<c014a8f5>] get_user_pages+0x29f/0x309

    The clues point to the following patch. Can you give it a test
    please?

    Thanks,
    Nick

    --
    SUSE Labs, Novell Inc.

    vm_normal_page can be called with a NULL vma. This can be replaced with
    gate_vma, and no problem because none of the gate vmas use VM_PFNMAP
    (if they did they would need to set vm_pgoff).

    Signed-off-by: Nick Piggin <npiggin@suse.de>

    Index: linux-2.6/mm/memory.c
    ===================================================================
    --- linux-2.6.orig/mm/memory.c
    +++ linux-2.6/mm/memory.c
    @@ -988,7 +988,8 @@ int get_user_pages(struct task_struct *t
    return i ? : -EFAULT;
    }
    if (pages) {
    - struct page *page = vm_normal_page(vma, start, *pte);
    + struct page *page;
    + page = vm_normal_page(gate_vma, start, *pte);
    pages[i] = page;
    if (page)
    get_page(page);
    \
     
     \ /
      Last update: 2005-11-29 08:45    [W:0.020 / U:1.992 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site