Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=7a238fcba0629b6f2edbcd37458bae56fcf36be5 Commit: 7a238fcba0629b6f2edbcd37458bae56fcf36be5 Parent: c0d4d573feed199b16094c072e7cb07afb01c598 Author: Serge E. Hallyn <[EMAIL PROTECTED]> AuthorDate: Mon Jan 29 13:19:40 2007 -0800 Committer: Linus Torvalds <[EMAIL PROTECTED]> CommitDate: Tue Jan 30 08:26:44 2007 -0800
[PATCH] namespaces: fix exit race by splitting exit Fix exit race by splitting the nsproxy putting into two pieces. First piece reduces the nsproxy refcount. If we dropped the last reference, then it puts the mnt_ns, and returns the nsproxy as a hint to the caller. Else it returns NULL. The second piece of exiting task namespaces sets tsk->nsproxy to NULL, and drops the references to other namespaces and frees the nsproxy only if an nsproxy was passed in. A little awkward and should probably be reworked, but hopefully it fixes the NFS oops. Signed-off-by: Serge E. Hallyn <[EMAIL PROTECTED]> Cc: Herbert Poetzl <[EMAIL PROTECTED]> Cc: Oleg Nesterov <[EMAIL PROTECTED]> Cc: "Eric W. Biederman" <[EMAIL PROTECTED]> Cc: Cedric Le Goater <[EMAIL PROTECTED]> Cc: Daniel Hokka Zakrisson <[EMAIL PROTECTED]> Signed-off-by: Andrew Morton <[EMAIL PROTECTED]> Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]> --- include/linux/nsproxy.h | 30 +++++++++++++++++++----------- kernel/exit.c | 6 ++++-- kernel/fork.c | 4 ++-- kernel/nsproxy.c | 16 +++++++++++++++- 4 files changed, 40 insertions(+), 16 deletions(-) diff --git a/include/linux/nsproxy.h b/include/linux/nsproxy.h index 0b9f0dc..678e1d3 100644 --- a/include/linux/nsproxy.h +++ b/include/linux/nsproxy.h @@ -35,22 +35,30 @@ struct nsproxy *dup_namespaces(struct nsproxy *orig); int copy_namespaces(int flags, struct task_struct *tsk); void get_task_namespaces(struct task_struct *tsk); void free_nsproxy(struct nsproxy *ns); +struct nsproxy *put_nsproxy(struct nsproxy *ns); -static inline void put_nsproxy(struct nsproxy *ns) +static inline void finalize_put_nsproxy(struct nsproxy *ns) { - if (atomic_dec_and_test(&ns->count)) { + if (ns) free_nsproxy(ns); - } } -static inline void exit_task_namespaces(struct task_struct *p) +static inline void put_and_finalize_nsproxy(struct nsproxy *ns) { - struct nsproxy *ns = p->nsproxy; - if (ns) { - task_lock(p); - p->nsproxy = NULL; - task_unlock(p); - put_nsproxy(ns); - } + finalize_put_nsproxy(put_nsproxy(ns)); +} + +static inline struct nsproxy *preexit_task_namespaces(struct task_struct *p) +{ + return put_nsproxy(p->nsproxy); +} + +static inline void exit_task_namespaces(struct task_struct *p, + struct nsproxy *ns) +{ + task_lock(p); + p->nsproxy = NULL; + task_unlock(p); + finalize_put_nsproxy(ns); } #endif diff --git a/kernel/exit.c b/kernel/exit.c index 3540172..a5bf532 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -396,7 +396,7 @@ void daemonize(const char *name, ...) current->fs = fs; atomic_inc(&fs->count); - exit_task_namespaces(current); + put_and_finalize_nsproxy(current->nsproxy); current->nsproxy = init_task.nsproxy; get_task_namespaces(current); @@ -853,6 +853,7 @@ static void exit_notify(struct task_struct *tsk) fastcall NORET_TYPE void do_exit(long code) { struct task_struct *tsk = current; + struct nsproxy *ns; int group_dead; profile_task_exit(tsk); @@ -938,8 +939,9 @@ fastcall NORET_TYPE void do_exit(long code) tsk->exit_code = code; proc_exit_connector(tsk); + ns = preexit_task_namespaces(tsk); exit_notify(tsk); - exit_task_namespaces(tsk); + exit_task_namespaces(tsk, ns); #ifdef CONFIG_NUMA mpol_free(tsk->mempolicy); tsk->mempolicy = NULL; diff --git a/kernel/fork.c b/kernel/fork.c index fc723e5..4cf8684 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1265,7 +1265,7 @@ static struct task_struct *copy_process(unsigned long clone_flags, return p; bad_fork_cleanup_namespaces: - exit_task_namespaces(p); + put_and_finalize_nsproxy(p->nsproxy); bad_fork_cleanup_keys: exit_keys(p); bad_fork_cleanup_mm: @@ -1711,7 +1711,7 @@ asmlinkage long sys_unshare(unsigned long unshare_flags) } if (new_nsproxy) - put_nsproxy(new_nsproxy); + put_and_finalize_nsproxy(new_nsproxy); bad_unshare_cleanup_ipc: if (new_ipc) diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c index f5b9ee6..7b05bce 100644 --- a/kernel/nsproxy.c +++ b/kernel/nsproxy.c @@ -117,7 +117,7 @@ int copy_namespaces(int flags, struct task_struct *tsk) goto out_pid; out: - put_nsproxy(old_ns); + put_and_finalize_nsproxy(old_ns); return err; out_pid: @@ -135,6 +135,20 @@ out_ns: goto out; } +struct nsproxy *put_nsproxy(struct nsproxy *ns) +{ + if (ns) { + if (atomic_dec_and_test(&ns->count)) { + if (ns->mnt_ns) { + put_mnt_ns(ns->mnt_ns); + ns->mnt_ns = NULL; + } + return ns; + } + } + return NULL; +} + void free_nsproxy(struct nsproxy *ns) { if (ns->mnt_ns) - To unsubscribe from this list: send the line "unsubscribe git-commits-head" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html