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authorJohn Baldwin <jhb@FreeBSD.org>2020-01-17 19:13:49 +0000
committerJohn Baldwin <jhb@FreeBSD.org>2020-01-17 19:13:49 +0000
commit7f1c5f36043d4601c08afae8530d90e2d9280c1d (patch)
treea47bbd020fc34e79753003df963364634a392fe0
parentffbf0e3ce4b200ecfffbd20edb9459d799ce72d4 (diff)
Notes
-rw-r--r--sys/riscv/riscv/machdep.c18
1 files changed, 8 insertions, 10 deletions
diff --git a/sys/riscv/riscv/machdep.c b/sys/riscv/riscv/machdep.c
index 82812fd137e2..2a4ed10b1def 100644
--- a/sys/riscv/riscv/machdep.c
+++ b/sys/riscv/riscv/machdep.c
@@ -367,6 +367,14 @@ set_mcontext(struct thread *td, mcontext_t *mcp)
tf = td->td_frame;
+ /*
+ * Make sure the processor mode has not been tampered with and
+ * interrupts have not been disabled.
+ * Supervisor interrupts in user mode are always enabled.
+ */
+ if ((mcp->mc_gpregs.gp_sstatus & SSTATUS_SPP) != 0)
+ return (EINVAL);
+
memcpy(tf->tf_t, mcp->mc_gpregs.gp_t, sizeof(tf->tf_t));
memcpy(tf->tf_s, mcp->mc_gpregs.gp_s, sizeof(tf->tf_s));
memcpy(tf->tf_a, mcp->mc_gpregs.gp_a, sizeof(tf->tf_a));
@@ -523,22 +531,12 @@ struct sigreturn_args {
int
sys_sigreturn(struct thread *td, struct sigreturn_args *uap)
{
- uint64_t sstatus;
ucontext_t uc;
int error;
if (copyin(uap->sigcntxp, &uc, sizeof(uc)))
return (EFAULT);
- /*
- * Make sure the processor mode has not been tampered with and
- * interrupts have not been disabled.
- * Supervisor interrupts in user mode are always enabled.
- */
- sstatus = uc.uc_mcontext.mc_gpregs.gp_sstatus;
- if ((sstatus & SSTATUS_SPP) != 0)
- return (EINVAL);
-
error = set_mcontext(td, &uc.uc_mcontext);
if (error != 0)
return (error);