[PATCH -next v18 12/20] riscv: signal: check fp-reserved words unconditionally

[Andy Chiu]

In order to let kernel/user locate and identify an extension context on
the existing sigframe, we are going to utilize reserved space of fp and
encode the information there. And since the sigcontext has already
preserved a space for fp context w or w/o CONFIG_FPU, we move those
reserved words checking/setting routine back into generic code.

This commit also undone an additional logical change carried by the
refactor commit 007f5c3589578
("Refactor FPU code in signal setup/return procedures"). Originally we
did not restore fp context if restoring of gpr have failed. And it was
fine on the other side. In such way the kernel could keep the regfiles
intact, and potentially react at the failing point of restore.

Signed-off-by: Andy Chiu <andy.chiu at sifive.com>
Acked-by: Conor Dooley <conor.dooley at microchip.com>
Acked-by: Heiko Stuebner <heiko.stuebner at vrull.eu>
Tested-by: Heiko Stuebner <heiko.stuebner at vrull.eu>
---
 arch/riscv/kernel/signal.c | 55 +++++++++++++++++++-------------------
 1 file changed, 28 insertions(+), 27 deletions(-)

diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c
index 2e365084417e..4d2f41078f46 100644
--- a/arch/riscv/kernel/signal.c
+++ b/arch/riscv/kernel/signal.c
@@ -39,26 +39,13 @@ static long restore_fp_state(struct pt_regs *regs,
 {
 	long err;
 	struct __riscv_d_ext_state __user *state = &sc_fpregs->d;
-	size_t i;
 
 	err = __copy_from_user(&current->thread.fstate, state, sizeof(*state));
 	if (unlikely(err))
 		return err;
 
 	fstate_restore(current, regs);
-
-	/* We support no other extension state at this time. */
-	for (i = 0; i < ARRAY_SIZE(sc_fpregs->q.reserved); i++) {
-		u32 value;
-
-		err = __get_user(value, &sc_fpregs->q.reserved[i]);
-		if (unlikely(err))
-			break;
-		if (value != 0)
-			return -EINVAL;
-	}
-
-	return err;
+	return 0;
 }
 
 static long save_fp_state(struct pt_regs *regs,
@@ -66,20 +53,9 @@ static long save_fp_state(struct pt_regs *regs,
 {
 	long err;
 	struct __riscv_d_ext_state __user *state = &sc_fpregs->d;
-	size_t i;
 
 	fstate_save(current, regs);
 	err = __copy_to_user(state, &current->thread.fstate, sizeof(*state));
-	if (unlikely(err))
-		return err;
-
-	/* We support no other extension state at this time. */
-	for (i = 0; i < ARRAY_SIZE(sc_fpregs->q.reserved); i++) {
-		err = __put_user(0, &sc_fpregs->q.reserved[i]);
-		if (unlikely(err))
-			break;
-	}
-
 	return err;
 }
 #else
@@ -91,11 +67,30 @@ static long restore_sigcontext(struct pt_regs *regs,
 	struct sigcontext __user *sc)
 {
 	long err;
+	size_t i;
+
 	/* sc_regs is structured the same as the start of pt_regs */
 	err = __copy_from_user(regs, &sc->sc_regs, sizeof(sc->sc_regs));
+	if (unlikely(err))
+		return err;
+
 	/* Restore the floating-point state. */
-	if (has_fpu())
-		err |= restore_fp_state(regs, &sc->sc_fpregs);
+	if (has_fpu()) {
+		err = restore_fp_state(regs, &sc->sc_fpregs);
+		if (unlikely(err))
+			return err;
+	}
+
+	/* We support no other extension state at this time. */
+	for (i = 0; i < ARRAY_SIZE(sc->sc_fpregs.q.reserved); i++) {
+		u32 value;
+
+		err = __get_user(value, &sc->sc_fpregs.q.reserved[i]);
+		if (unlikely(err))
+			break;
+		if (value != 0)
+			return -EINVAL;
+	}
 	return err;
 }
 
@@ -146,11 +141,17 @@ static long setup_sigcontext(struct rt_sigframe __user *frame,
 {
 	struct sigcontext __user *sc = &frame->uc.uc_mcontext;
 	long err;
+	size_t i;
+
 	/* sc_regs is structured the same as the start of pt_regs */
 	err = __copy_to_user(&sc->sc_regs, regs, sizeof(sc->sc_regs));
 	/* Save the floating-point state. */
 	if (has_fpu())
 		err |= save_fp_state(regs, &sc->sc_fpregs);
+	/* We support no other extension state at this time. */
+	for (i = 0; i < ARRAY_SIZE(sc->sc_fpregs.q.reserved); i++)
+		err |= __put_user(0, &sc->sc_fpregs.q.reserved[i]);
+
 	return err;
 }
 
-- 
2.17.1