Oren Laadan [[email protected]] wrote:
|
| > + /*
| > + * TODO: If size of clone_args is not what the kernel expects, it
| > + * could be that kernel is newer and has an extended structure.
| > + * When that happens, this check needs to be smarter (and we
| > + * need an additional copy_from_user()). For now, assume exact
| > + * match.
| > + */
| > + if (kcs.clone_args_size != sizeof(kcs))
| > + return -EINVAL;
|
| I wonder if this is a reason to move the clone_args_size outside the
| structure and pass it as a regular argument ? This will rid the
| (futuristic) additional copy-from-user (in case it causes a concern
| for clone performance ?)
Your idea makes sense to me.
Roland, Peter Arnd: do you have any concerns with removing clone_args_size
from the structure and making it a parameter ?
struct clone_args {
u64 clone_flags_high;
u64 child_stack_base;
u64 child_stack_size;
u64 parent_tid_ptr;
u64 child_tid_ptr;
u32 nr_pids;
u32 reserved0;
u64 reserved1;
};
sys_clone_with_pids(u32 flags_low, struct clone_args *cargs,
u32 nr_pids, u32 clone_args_size)
Sukadev
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