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    Subject[PATCH 2/2] mm: restrict access to /proc/meminfo
    /proc/meminfo stores information related to memory pages usage, which
    may be used to monitor the number of objects in specific caches (and/or
    the changes of these numbers). This might reveal private information
    similar to /proc/slabinfo infoleaks. To remove the infoleak, just
    restrict meminfo to root. If it is used by unprivileged daemons,
    meminfo permissions can be altered the same way as slabinfo:

    groupadd meminfo
    usermod -a -G meminfo $MONITOR_USER
    chmod g+r /proc/meminfo
    chgrp meminfo /proc/meminfo

    Signed-off-by: Vasiliy Kulikov <>
    CC: Kees Cook <>
    CC: Dave Hansen <>
    CC: Christoph Lameter <>
    CC: Pekka Enberg <>
    CC: Linus Torvalds <>
    CC: David Rientjes <>
    CC: Alan Cox <>
    fs/proc/meminfo.c | 2 +-
    1 files changed, 1 insertions(+), 1 deletions(-)

    diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
    index 5861741..949bdee 100644
    --- a/fs/proc/meminfo.c
    +++ b/fs/proc/meminfo.c
    @@ -187,7 +187,7 @@ static const struct file_operations meminfo_proc_fops = {

    static int __init proc_meminfo_init(void)
    - proc_create("meminfo", 0, NULL, &meminfo_proc_fops);
    + proc_create("meminfo", S_IFREG | S_IRUSR, NULL, &meminfo_proc_fops);
    return 0;

     \ /
      Last update: 2011-09-27 19:59    [W:0.020 / U:2.756 seconds]
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