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    Subject[patch cr 3/4] c/r: procfs: add arg_start/end, env_start/end and exit_code members to /proc/$pid/stat
    We would like to have an ability to restore command line
    arguments and envirion pointers so the task being restored
    would print appropriate values in /proc/pid/cmdline and
    /proc/pid/envirion. The exit_code is needed to restore
    zombie tasks.

    Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
    Reviewed-by: Kees Cook <keescook@chromium.org>
    Cc: Pavel Emelyanov <xemul@parallels.com>
    Cc: Serge Hallyn <serge.hallyn@canonical.com>
    Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
    Cc: Alexey Dobriyan <adobriyan@gmail.com>
    Cc: Tejun Heo <tj@kernel.org>
    Cc: Andrew Vagin <avagin@openvz.org>
    Cc: Vasiliy Kulikov <segoon@openwall.com>
    Cc: Alexey Dobriyan <adobriyan@gmail.com>
    Cc: "Eric W. Biederman" <ebiederm@xmission.com>
    ---
    Documentation/filesystems/proc.txt | 5 +++++
    fs/proc/array.c | 25 ++++++++++++++++++++-----
    2 files changed, 25 insertions(+), 5 deletions(-)

    Index: linux-2.6.git/Documentation/filesystems/proc.txt
    ===================================================================
    --- linux-2.6.git.orig/Documentation/filesystems/proc.txt
    +++ linux-2.6.git/Documentation/filesystems/proc.txt
    @@ -311,6 +311,11 @@ Table 1-4: Contents of the stat files (a
    start_data address above which program data+bss is placed
    end_data address below which program data+bss is placed
    start_brk address above which program heap can be expanded with brk()
    + arg_start address above which program command line is placed
    + arg_end address below which program command line is placed
    + env_start address above which program environment is placed
    + env_end address below which program environment is placed
    + exit_code the thread's exit_code in the form reported by the waitpid system call
    ..............................................................................

    The /proc/PID/maps file containing the currently mapped memory regions and
    Index: linux-2.6.git/fs/proc/array.c
    ===================================================================
    --- linux-2.6.git.orig/fs/proc/array.c
    +++ linux-2.6.git/fs/proc/array.c
    @@ -464,7 +464,7 @@ static int do_task_stat(struct seq_file

    seq_printf(m, "%d (%s) %c %d %d %d %d %d %u %lu \
    %lu %lu %lu %lu %lu %ld %ld %ld %ld %d 0 %llu %lu %ld %lu %lu %lu %lu %lu \
    -%lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld %lu %lu %lu\n",
    +%lu %lu %lu %lu %lu %lu %lu %lu %d %d %u %u %llu %lu %ld ",
    pid_nr_ns(pid, ns),
    tcomm,
    state,
    @@ -511,10 +511,25 @@ static int do_task_stat(struct seq_file
    task->policy,
    (unsigned long long)delayacct_blkio_ticks(task),
    cputime_to_clock_t(gtime),
    - cputime_to_clock_t(cgtime),
    - (mm && permitted) ? mm->start_data : 0,
    - (mm && permitted) ? mm->end_data : 0,
    - (mm && permitted) ? mm->start_brk : 0);
    + cputime_to_clock_t(cgtime));
    +
    + if (mm && permitted) {
    + seq_printf(m, "%lu %lu %lu %lu %lu %lu %lu ",
    + mm->start_data,
    + mm->end_data,
    + mm->start_brk,
    + mm->arg_start,
    + mm->arg_end,
    + mm->env_start,
    + mm->env_end);
    + } else
    + seq_printf(m, "0 0 0 0 0 0 0 ");
    +
    + if (permitted)
    + seq_printf(m, "%d\n", task->exit_code);
    + else
    + seq_printf(m, "0\n");
    +
    if (mm)
    mmput(mm);
    return 0;


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