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SubjectRe: [v12][PATCH 6/9] Check invalid clone flags
Cc: LKML

Sukadev Bhattiprolu [sukadev@linux.vnet.ibm.com] wrote:
|
| Subject: [v12][PATCH 6/9] Check invalid clone flags
|
| As pointed out by Oren Laadan, we want to ensure that unused bits in the
| clone-flags remain unused and available for future. To ensure this, define
| a mask of clone-flags and check the flags in the clone() system calls.
|
| Changelog[v9]:
| - Include the unused clone-flag (CLONE_UNUSED) to VALID_CLONE_FLAGS
| to avoid breaking any applications that may have set it. IOW, this
| patch/check only applies to clone-flags bits 33 and higher.
|
| Changelog[v8]:
| - New patch in set
|
| Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
| Acked-by: Oren Laadan <orenl@cs.columbia.edu>
| ---
| include/linux/sched.h | 12 ++++++++++++
| kernel/fork.c | 3 +++
| 2 files changed, 15 insertions(+), 0 deletions(-)
|
| diff --git a/include/linux/sched.h b/include/linux/sched.h
| index 75e6e60..a4d2c23 100644
| --- a/include/linux/sched.h
| +++ b/include/linux/sched.h
| @@ -29,6 +29,18 @@
| #define CLONE_NEWNET 0x40000000 /* New network namespace */
| #define CLONE_IO 0x80000000 /* Clone io context */
|
| +#define CLONE_UNUSED 0x00001000 /* Can be reused ? */
| +
| +#define VALID_CLONE_FLAGS (CSIGNAL | CLONE_VM | CLONE_FS | CLONE_FILES |\
| + CLONE_SIGHAND | CLONE_UNUSED | CLONE_PTRACE |\
| + CLONE_VFORK | CLONE_PARENT | CLONE_THREAD |\
| + CLONE_NEWNS | CLONE_SYSVSEM | CLONE_SETTLS |\
| + CLONE_PARENT_SETTID | CLONE_CHILD_CLEARTID |\
| + CLONE_DETACHED | CLONE_UNTRACED |\
| + CLONE_CHILD_SETTID | CLONE_STOPPED |\
| + CLONE_NEWUTS | CLONE_NEWIPC | CLONE_NEWUSER |\
| + CLONE_NEWPID | CLONE_NEWNET | CLONE_IO)
| +
| /*
| * Scheduling policies
| */
| diff --git a/kernel/fork.c b/kernel/fork.c
| index c8a06de..11f77ed 100644
| --- a/kernel/fork.c
| +++ b/kernel/fork.c
| @@ -982,6 +982,9 @@ static struct task_struct *copy_process(unsigned long clone_flags,
| struct task_struct *p;
| int cgroup_callbacks_done = 0;
|
| + if (clone_flags & ~VALID_CLONE_FLAGS)
| + return ERR_PTR(-EINVAL);
| +
| if ((clone_flags & (CLONE_NEWNS|CLONE_FS)) == (CLONE_NEWNS|CLONE_FS))
| return ERR_PTR(-EINVAL);
|
| --
| 1.6.0.4
|
| _______________________________________________
| Containers mailing list
| Containers@lists.linux-foundation.org
| https://lists.linux-foundation.org/mailman/listinfo/containers


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