diff options
| author | Andrei Vagin <avagin@gmail.com> | 2022-06-13 09:07:22 +0300 |
|---|---|---|
| committer | Kees Cook <keescook@chromium.org> | 2022-06-15 17:58:04 +0300 |
| commit | 133e2d3e81de5d9706cab2dd1d52d231c27382e5 (patch) | |
| tree | 04ff6fdda3b663c9069512108da2b73483134af8 /fs/exec.c | |
| parent | b13baccc3850ca8b8cccbf8ed9912dbaa0fdf7f3 (diff) | |
| download | linux-133e2d3e81de5d9706cab2dd1d52d231c27382e5.tar.xz | |
fs/exec: allow to unshare a time namespace on vfork+exec
Right now, a new process can't be forked in another time namespace
if it shares mm with its parent. It is prohibited, because each time
namespace has its own vvar page that is mapped into a process address
space.
When a process calls exec, it gets a new mm and so it could be "legal"
to switch time namespace in that case. This was not implemented and
now if we want to do this, we need to add another clone flag to not
break backward compatibility.
We don't have any user requests to switch times on exec except the
vfork+exec combination, so there is no reason to add a new clone flag.
As for vfork+exec, this should be safe to allow switching timens with
the current clone flag. Right now, vfork (CLONE_VFORK | CLONE_VM) fails
if a child is forked into another time namespace. With this change,
vfork creates a new process in parent's timens, and the following exec
does the actual switch to the target time namespace.
Suggested-by: Florian Weimer <fweimer@redhat.com>
Signed-off-by: Andrei Vagin <avagin@gmail.com>
Acked-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20220613060723.197407-1-avagin@gmail.com
Diffstat (limited to 'fs/exec.c')
| -rw-r--r-- | fs/exec.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/fs/exec.c b/fs/exec.c index 0989fb8472a1..347e8f55bc2b 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -65,6 +65,7 @@ #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> @@ -982,10 +983,12 @@ static int exec_mmap(struct mm_struct *mm) { struct task_struct *tsk; struct mm_struct *old_mm, *active_mm; + bool vfork; int ret; /* Notify parent that we're no longer interested in the old VM */ tsk = current; + vfork = !!tsk->vfork_done; old_mm = current->mm; exec_mm_release(tsk, old_mm); if (old_mm) @@ -1030,6 +1033,10 @@ static int exec_mmap(struct mm_struct *mm) tsk->mm->vmacache_seqnum = 0; vmacache_flush(tsk); task_unlock(tsk); + + if (vfork) + timens_on_fork(tsk->nsproxy, tsk); + if (old_mm) { mmap_read_unlock(old_mm); BUG_ON(active_mm != old_mm); |