svn commit: r345468 - head/sys/amd64/linux

Dmitry Chagin dchagin at FreeBSD.org
Sun Mar 24 14:02:58 UTC 2019


Author: dchagin
Date: Sun Mar 24 14:02:57 2019
New Revision: 345468
URL: https://svnweb.freebsd.org/changeset/base/345468

Log:
  Revert r313993.
  AMD64_SET_**BASE expects a pointer to a pointer, we just passing in the pointer value itself.
  
  Set PCB_FULL_IRET for doreti to restore %fs, %gs and its correspondig base.
  
  PR:		225105
  Reported by:	trasz@
  MFC after:	1 month

Modified:
  head/sys/amd64/linux/linux_machdep.c

Modified: head/sys/amd64/linux/linux_machdep.c
==============================================================================
--- head/sys/amd64/linux/linux_machdep.c	Sun Mar 24 12:13:05 2019	(r345467)
+++ head/sys/amd64/linux/linux_machdep.c	Sun Mar 24 14:02:57 2019	(r345468)
@@ -228,35 +228,38 @@ linux_sigaltstack(struct thread *td, struct linux_siga
 int
 linux_arch_prctl(struct thread *td, struct linux_arch_prctl_args *args)
 {
+	struct pcb *pcb;
 	int error;
-	struct sysarch_args bsd_args;
 
+	pcb = td->td_pcb;
 	LINUX_CTR2(arch_prctl, "0x%x, %p", args->code, args->addr);
 
 	switch (args->code) {
 	case LINUX_ARCH_SET_GS:
-		bsd_args.op = AMD64_SET_GSBASE;
-		bsd_args.parms = (void *)args->addr;
-		error = sysarch(td, &bsd_args);
-		if (error == EINVAL)
+		if (args->addr < VM_MAXUSER_ADDRESS) {
+			set_pcb_flags(pcb, PCB_FULL_IRET);
+			pcb->pcb_gsbase = args->addr;
+			td->td_frame->tf_gs = _ugssel;
+			error = 0;
+		} else
 			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) {
+			set_pcb_flags(pcb, PCB_FULL_IRET);
+			pcb->pcb_fsbase = args->addr;
+			td->td_frame->tf_fs = _ufssel;
+			error = 0;
+		} else
 			error = EPERM;
 		break;
 	case LINUX_ARCH_GET_FS:
-		bsd_args.op = AMD64_GET_FSBASE;
-		bsd_args.parms = (void *)args->addr;
-		error = sysarch(td, &bsd_args);
+		error = copyout(&pcb->pcb_fsbase, PTRIN(args->addr),
+		    sizeof(args->addr));
 		break;
 	case LINUX_ARCH_GET_GS:
-		bsd_args.op = AMD64_GET_GSBASE;
-		bsd_args.parms = (void *)args->addr;
-		error = sysarch(td, &bsd_args);
+		error = copyout(&pcb->pcb_gsbase, PTRIN(args->addr),
+		    sizeof(args->addr));
 		break;
 	default:
 		error = EINVAL;


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