Check for errors from copyout() and suword*() in sv_copyout_args/strings.

[jhb]

Summary

Tested on: amd64 (amd64, i386, linux64), i386 (i386, linux)

[brooks]

LGTM

[kib]

sys/amd64/linux/linux_sysvec.c

323

if (error != 0) for all places

sys/kern/kern_exec.c

363

stack_base almost cries to become uintptr_t, and you are touching almost all places which need explicit type for it. Then at least some casts could be removed, like sv_setregs calls.

But I do not insist.

[jhb]

• Use 'if (error != 0)'

[jhb]

sys/kern/kern_exec.c

363

Or a char *, but uintptr_t is probably fine. I actually planned to make this change as a followup as part of some other cleanup I am doing. I will do that as a followup change.