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| author | Elena Reshetova <elena.reshetova@intel.com> | 2017-02-20 11:19:00 +0100 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2017-03-06 20:55:22 +0100 |
| commit | 387ad9674b0013c8756ad20d854ff005b0c313ad (patch) | |
| tree | 4e019a943d277232afdd5421276cc48829008214 /kernel/cgroup | |
| parent | Linux 4.11-rc1 (diff) | |
| download | linux-387ad9674b0013c8756ad20d854ff005b0c313ad.tar.xz linux-387ad9674b0013c8756ad20d854ff005b0c313ad.zip | |
kernel: convert cgroup_namespace.count from atomic_t to refcount_t
refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.
Signed-off-by: Elena Reshetova <elena.reshetova@intel.com>
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David Windsor <dwindsor@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'kernel/cgroup')
| -rw-r--r-- | kernel/cgroup/cgroup.c | 2 | ||||
| -rw-r--r-- | kernel/cgroup/namespace.c | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index 0125589c7428..8ee78688e36d 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -189,7 +189,7 @@ static u16 have_canfork_callback __read_mostly; /* cgroup namespace for init task */ struct cgroup_namespace init_cgroup_ns = { - .count = { .counter = 2, }, + .count = REFCOUNT_INIT(2), .user_ns = &init_user_ns, .ns.ops = &cgroupns_operations, .ns.inum = PROC_CGROUP_INIT_INO, diff --git a/kernel/cgroup/namespace.c b/kernel/cgroup/namespace.c index 96d38dab6fb2..66129eb4371d 100644 --- a/kernel/cgroup/namespace.c +++ b/kernel/cgroup/namespace.c @@ -31,7 +31,7 @@ static struct cgroup_namespace *alloc_cgroup_ns(void) kfree(new_ns); return ERR_PTR(ret); } - atomic_set(&new_ns->count, 1); + refcount_set(&new_ns->count, 1); new_ns->ns.ops = &cgroupns_operations; return new_ns; } |