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    Subject[PATCH 2/3] Fix /proc/pid/pagemap header copy to userspace
    From
    Earlier code relied on a broken length calculation copy
    /proc/pid/pagemap header data to userspace. This fix
    correctly calls the add_to_pagemap routine after the header data is
    set to copy results to userspace in a sane fashion.

    Signed-off-by: Dave Boutcher <boutcher@cs.umn.edu>
    ---
    fs/proc/task_mmu.c | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
    index b2baeab..1f78cb4 100644
    --- a/fs/proc/task_mmu.c
    +++ b/fs/proc/task_mmu.c
    @@ -657,11 +657,11 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
    pm.out = buf;

    if (svpfn == -1) {
    - add_to_pagemap(pm.next, 0, &pm);
    ((char *)page)[0] = (ntohl(1) != 1);
    ((char *)page)[1] = PAGE_SHIFT;
    ((char *)page)[2] = sizeof(unsigned long);
    ((char *)page)[3] = sizeof(unsigned long);
    + add_to_pagemap(pm.next, page[0], &pm);
    }

    down_read(&mm->mmap_sem);
    --
    1.4.4.2
    -
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