Cc: LKML
Sukadev Bhattiprolu [[email protected]] 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 <[email protected]> | Acked-by: Oren Laadan <[email protected]> | --- | 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 | [email protected] | https://lists.linux-foundation.org/mailman/listinfo/containers -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
