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| author | Mauro Carvalho Chehab <mchehab@redhat.com> | 2012-11-28 07:22:38 -0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2012-11-28 07:22:38 -0200 |
| commit | d033a308d81ec83908760a15a841c2bd0d5e0ea3 (patch) | |
| tree | 647abd67987fe4d7fee80105fc823edf3f53b4f6 /kernel/pid_namespace.c | |
| parent | c6c22955f80f2db9614b01fe5a3d1cfcd8b3d848 (diff) | |
| parent | e23739b4ade80a3a7f87198f008f6c44a7cbc9fd (diff) | |
Merge remote-tracking branch 'linus/master' into staging/for_v3.8
* linus/master: (1428 commits)
futex: avoid wake_futex() for a PI futex_q
watchdog: using u64 in get_sample_period()
writeback: put unused inodes to LRU after writeback completion
mm: vmscan: check for fatal signals iff the process was throttled
Revert "mm: remove __GFP_NO_KSWAPD"
proc: check vma->vm_file before dereferencing
UAPI: strip the _UAPI prefix from header guards during header installation
include/linux/bug.h: fix sparse warning related to BUILD_BUG_ON_INVALID
Linux 3.7-rc7
powerpc/eeh: Do not invalidate PE properly
ALSA: hda - Fix build without CONFIG_PM
of/address: sparc: Declare of_iomap as an extern function for sparc again
PM / QoS: fix wrong error-checking condition
bnx2x: remove redundant warning log
vxlan: fix command usage in its doc
8139cp: revert "set ring address before enabling receiver"
MPI: Fix compilation on MIPS with GCC 4.4 and newer
MIPS: Fix crash that occurs when function tracing is enabled
MIPS: Merge overlapping bootmem ranges
jbd: Fix lock ordering bug in journal_unmap_buffer()
...
Diffstat (limited to 'kernel/pid_namespace.c')
| -rw-r--r-- | kernel/pid_namespace.c | 33 |
1 files changed, 25 insertions, 8 deletions
diff --git a/kernel/pid_namespace.c b/kernel/pid_namespace.c index 478bad2745e3..7b07cc0dfb75 100644 --- a/kernel/pid_namespace.c +++ b/kernel/pid_namespace.c @@ -71,12 +71,22 @@ err_alloc: return NULL; } +/* MAX_PID_NS_LEVEL is needed for limiting size of 'struct pid' */ +#define MAX_PID_NS_LEVEL 32 + static struct pid_namespace *create_pid_namespace(struct pid_namespace *parent_pid_ns) { struct pid_namespace *ns; unsigned int level = parent_pid_ns->level + 1; - int i, err = -ENOMEM; + int i; + int err; + + if (level > MAX_PID_NS_LEVEL) { + err = -EINVAL; + goto out; + } + err = -ENOMEM; ns = kmem_cache_zalloc(pid_ns_cachep, GFP_KERNEL); if (ns == NULL) goto out; @@ -133,19 +143,26 @@ struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *old return create_pid_namespace(old_ns); } -void free_pid_ns(struct kref *kref) +static void free_pid_ns(struct kref *kref) { - struct pid_namespace *ns, *parent; + struct pid_namespace *ns; ns = container_of(kref, struct pid_namespace, kref); - - parent = ns->parent; destroy_pid_namespace(ns); +} + +void put_pid_ns(struct pid_namespace *ns) +{ + struct pid_namespace *parent; - if (parent != NULL) - put_pid_ns(parent); + while (ns != &init_pid_ns) { + parent = ns->parent; + if (!kref_put(&ns->kref, free_pid_ns)) + break; + ns = parent; + } } -EXPORT_SYMBOL_GPL(free_pid_ns); +EXPORT_SYMBOL_GPL(put_pid_ns); void zap_pid_ns_processes(struct pid_namespace *pid_ns) { |