MFamd64: Check for invalid flags in the machine context in sigreturn()
and setcontext().
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521b1af4ea
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@ -1060,6 +1060,11 @@ sys_sigreturn(td, uap)
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if (error != 0)
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return (error);
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ucp = &uc;
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if ((ucp->uc_mcontext.mc_flags & ~_MC_FLAG_MASK) != 0) {
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uprintf("pid %d (%s): sigreturn mc_flags %x\n", p->p_pid,
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td->td_name, ucp->uc_mcontext.mc_flags);
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return (EINVAL);
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}
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regs = td->td_frame;
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eflags = ucp->uc_mcontext.mc_eflags;
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if (eflags & PSL_VM) {
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@ -3858,7 +3863,8 @@ set_mcontext(struct thread *td, const mcontext_t *mcp)
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int eflags, ret;
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tp = td->td_frame;
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if (mcp->mc_len != sizeof(*mcp))
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if (mcp->mc_len != sizeof(*mcp) ||
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(mcp->mc_flags & ~_MC_FLAG_MASK) != 0)
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return (EINVAL);
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eflags = (mcp->mc_eflags & PSL_USERCHANGE) |
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(tp->tf_eflags & ~PSL_USERCHANGE);
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