diff options
| -rw-r--r-- | fs/exec.c | 5 | ||||
| -rw-r--r-- | include/linux/nsproxy.h | 1 | ||||
| -rw-r--r-- | kernel/fork.c | 9 | ||||
| -rw-r--r-- | kernel/nsproxy.c | 23 |
4 files changed, 27 insertions, 11 deletions
diff --git a/fs/exec.c b/fs/exec.c index 32dc8cf5fceb..34e6a2e53268 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -64,6 +64,7 @@ #include <linux/io_uring.h> #include <linux/syscall_user_dispatch.h> #include <linux/coredump.h> +#include <linux/time_namespace.h> #include <linux/uaccess.h> #include <asm/mmu_context.h> @@ -1297,6 +1298,10 @@ int begin_new_exec(struct linux_binprm * bprm) bprm->mm = NULL; + retval = exec_task_namespaces(); + if (retval) + goto out_unlock; + #ifdef CONFIG_POSIX_TIMERS spin_lock_irq(&me->sighand->siglock); posix_cpu_timers_exit(me); diff --git a/include/linux/nsproxy.h b/include/linux/nsproxy.h index cdb171efc7cb..fee881cded01 100644 --- a/include/linux/nsproxy.h +++ b/include/linux/nsproxy.h @@ -94,6 +94,7 @@ static inline struct cred *nsset_cred(struct nsset *set) int copy_namespaces(unsigned long flags, struct task_struct *tsk); void exit_task_namespaces(struct task_struct *tsk); void switch_task_namespaces(struct task_struct *tsk, struct nsproxy *new); +int exec_task_namespaces(void); void free_nsproxy(struct nsproxy *ns); int unshare_nsproxy_namespaces(unsigned long, struct nsproxy **, struct cred *, struct fs_struct *); diff --git a/kernel/fork.c b/kernel/fork.c index 08969f5aa38d..44224a9b004c 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -2043,15 +2043,6 @@ static __latent_entropy struct task_struct *copy_process( return ERR_PTR(-EINVAL); } - /* - * If the new process will be in a different time namespace - * do not allow it to share VM or a thread group with the forking task. - */ - if (clone_flags & (CLONE_THREAD | CLONE_VM)) { - if (nsp->time_ns != nsp->time_ns_for_children) - return ERR_PTR(-EINVAL); - } - if (clone_flags & CLONE_PIDFD) { /* * - CLONE_DETACHED is blocked so that we can potentially diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c index eec72ca962e2..a487ff24129b 100644 --- a/kernel/nsproxy.c +++ b/kernel/nsproxy.c @@ -157,7 +157,8 @@ int copy_namespaces(unsigned long flags, struct task_struct *tsk) if (likely(!(flags & (CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC | CLONE_NEWPID | CLONE_NEWNET | CLONE_NEWCGROUP | CLONE_NEWTIME)))) { - if (likely(old_ns->time_ns_for_children == old_ns->time_ns)) { + if ((flags & CLONE_VM) || + likely(old_ns->time_ns_for_children == old_ns->time_ns)) { get_nsproxy(old_ns); return 0; } @@ -179,7 +180,8 @@ int copy_namespaces(unsigned long flags, struct task_struct *tsk) if (IS_ERR(new_ns)) return PTR_ERR(new_ns); - timens_on_fork(new_ns, tsk); + if ((flags & CLONE_VM) == 0) + timens_on_fork(new_ns, tsk); tsk->nsproxy = new_ns; return 0; @@ -254,6 +256,23 @@ void exit_task_namespaces(struct task_struct *p) switch_task_namespaces(p, NULL); } +int exec_task_namespaces(void) +{ + struct task_struct *tsk = current; + struct nsproxy *new; + + if (tsk->nsproxy->time_ns_for_children == tsk->nsproxy->time_ns) + return 0; + + new = create_new_namespaces(0, tsk, current_user_ns(), tsk->fs); + if (IS_ERR(new)) + return PTR_ERR(new); + + timens_on_fork(new, tsk); + switch_task_namespaces(tsk, new); + return 0; +} + static int check_setns_flags(unsigned long flags) { if (!flags || (flags & ~(CLONE_NEWNS | CLONE_NEWUTS | CLONE_NEWIPC | |