Author: jhb
Date: Tue Nov 25 12:52:00 2014
New Revision: 275035
URL: https://svnweb.freebsd.org/changeset/base/275035
Log:
MFamd64: Check for invalid flags in the machine context in sigreturn()
and setcontext().
Modified:
head/sys/i386/i386/machdep.c
Modified: head/sys/i386/i386/machdep.c
==============================================================================
--- head/sys/i386/i386/machdep.c Tue Nov 25 12:45:31 2014
(r275034)
+++ head/sys/i386/i386/machdep.c Tue Nov 25 12:52:00 2014
(r275035)
@@ -1060,6 +1060,11 @@ sys_sigreturn(td, uap)
if (error != 0)
return (error);
ucp = &uc;
+ if ((ucp->uc_mcontext.mc_flags & ~_MC_FLAG_MASK) != 0) {
+ uprintf("pid %d (%s): sigreturn mc_flags %x\n", p->p_pid,
+ td->td_name, ucp->uc_mcontext.mc_flags);
+ return (EINVAL);
+ }
regs = td->td_frame;
eflags = ucp->uc_mcontext.mc_eflags;
if (eflags & PSL_VM) {
@@ -3858,7 +3863,8 @@ set_mcontext(struct thread *td, const mc
int eflags, ret;
tp = td->td_frame;
- if (mcp->mc_len != sizeof(*mcp))
+ if (mcp->mc_len != sizeof(*mcp) ||
+ (mcp->mc_flags & ~_MC_FLAG_MASK) != 0)
return (EINVAL);
eflags = (mcp->mc_eflags & PSL_USERCHANGE) |
(tp->tf_eflags & ~PSL_USERCHANGE);
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