https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=225105
Yanko Yankulov <yanko.yanku...@gmail.com> changed:
What |Removed |Added
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CC| |yanko.yanku...@gmail.com
--- Comment #11 from Yanko Yankulov <yanko.yanku...@gmail.com> ---
Hi guys,
Hit this a few weeks ago haven't notice the ticket, the sysarch call will try
to load the arguments from userspace and fail as they are on the kernel stack.
A working (but ugly) solution is to duplicate the code in linux_machdep:
--- a/sys/amd64/linux/linux_machdep.c
+++ b/sys/amd64/linux/linux_machdep.c
@@ -240,10 +240,14 @@ linux_arch_prctl(struct thread *td, struct
linux_arch_prctl_args *args)
error = EPERM;
break;
case LINUX_ARCH_SET_FS:
- bsd_args.op = AMD64_SET_FSBASE;
- bsd_args.parms = (void *)args->addr;
- error = sysarch(td, &bsd_args);
- if (error == EINVAL)
+ if (args->addr < VM_MAXUSER_ADDRESS) {
+ struct pcb *pcb = curthread->td_pcb;
+ set_pcb_flags(pcb, PCB_FULL_IRET);
+ pcb->pcb_fsbase = args->addr;
+ td->td_frame->tf_fs = _ufssel;
+ error = 0;
+ }
+ else
error = EPERM;
A better solution will be to change sysarch to accept addition parameter about
the location of the memory, but haven't have the time to explore this path yet.
Hope this helps.
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