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authorAndrei Vagin <avagin@gmail.com>2022-09-13 03:25:51 -0700
committerKees Cook <keescook@chromium.org>2022-09-13 10:38:43 -0700
commit33a2d6bc3480f9f8ac8c8def29854f98cc8bfee2 (patch)
tree466386c55362d0c87eefaa71305d21908190df46 /kernel/nsproxy.c
parent2b1e8921fc355ff5afda65690d6e40ce25b80cd7 (diff)
Revert "fs/exec: allow to unshare a time namespace on vfork+exec"
This reverts commit 133e2d3e81de5d9706cab2dd1d52d231c27382e5. Alexey pointed out a few undesirable side effects of the reverted change. First, it doesn't take into account that CLONE_VFORK can be used with CLONE_THREAD. Second, a child process doesn't enter a target time name-space, if its parent dies before the child calls exec. It happens because the parent clears vfork_done. Eric W. Biederman suggests installing a time namespace as a task gets a new mm. It includes all new processes cloned without CLONE_VM and all tasks that call exec(). This is an user API change, but we think there aren't users that depend on the old behavior. It is too late to make such changes in this release, so let's roll back this patch and introduce the right one in the next release. Cc: Alexey Izbyshev <izbyshev@ispras.ru> Cc: Christian Brauner <brauner@kernel.org> Cc: Dmitry Safonov <0x7f454c46@gmail.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Florian Weimer <fweimer@redhat.com> Cc: Kees Cook <keescook@chromium.org> Signed-off-by: Andrei Vagin <avagin@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20220913102551.1121611-3-avagin@google.com
Diffstat (limited to 'kernel/nsproxy.c')
-rw-r--r--kernel/nsproxy.c3
1 files changed, 1 insertions, 2 deletions
diff --git a/kernel/nsproxy.c b/kernel/nsproxy.c
index b4cbb406bc28..eec72ca962e2 100644
--- a/kernel/nsproxy.c
+++ b/kernel/nsproxy.c
@@ -179,8 +179,7 @@ int copy_namespaces(unsigned long flags, struct task_struct *tsk)
if (IS_ERR(new_ns))
return PTR_ERR(new_ns);
- if ((flags & CLONE_VM) == 0)
- timens_on_fork(new_ns, tsk);
+ timens_on_fork(new_ns, tsk);
tsk->nsproxy = new_ns;
return 0;