Author: kib
Date: Wed Jul 16 08:59:44 2014
New Revision: 268744
URL: http://svnweb.freebsd.org/changeset/base/268744
Log:
MFC r268471:
For safety, ensure that any consumer of the set_regs() and
ptrace_set_pc() use the correct return to userspace using iret.
Modified:
stable/9/sys/amd64/amd64/machdep.c
Directory Properties:
stable/9/sys/ (props changed)
Modified: stable/9/sys/amd64/amd64/machdep.c
==============================================================================
--- stable/9/sys/amd64/amd64/machdep.c Wed Jul 16 08:58:38 2014
(r268743)
+++ stable/9/sys/amd64/amd64/machdep.c Wed Jul 16 08:59:44 2014
(r268744)
@@ -1945,7 +1945,9 @@ makectx(struct trapframe *tf, struct pcb
int
ptrace_set_pc(struct thread *td, unsigned long addr)
{
+
td->td_frame->tf_rip = addr;
+ set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
return (0);
}
@@ -2045,8 +2047,8 @@ set_regs(struct thread *td, struct reg *
tp->tf_fs = regs->r_fs;
tp->tf_gs = regs->r_gs;
tp->tf_flags = TF_HASSEGS;
- set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
}
+ set_pcb_flags(td->td_pcb, PCB_FULL_IRET);
return (0);
}
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