linux-kernel - [patch V3 19/20] x86/fpu/signal: Change return code of check_xstate_in

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Date:   Wed,  8 Sep 2021 15:29:40 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     x86@...nel.org, Al Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Tony Luck <tony.luck@...el.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Peter Ziljstra <peterz@...radead.org>,
        Song Liu <songliubraving@...com>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: [patch V3 19/20] x86/fpu/signal: Change return code of
 check_xstate_in_sigframe() to boolean

__fpu_sig_restore() only needs success/fail information and no detailed
error code.

Suggested-by: Al Viro <viro@...iv.linux.org.uk>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
 arch/x86/kernel/fpu/signal.c |   14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

--- a/arch/x86/kernel/fpu/signal.c
+++ b/arch/x86/kernel/fpu/signal.c
@@ -23,8 +23,8 @@ static struct _fpx_sw_bytes fx_sw_reserv
  * Check for the presence of extended state information in the
  * user fpstate pointer in the sigcontext.
  */
-static inline int check_xstate_in_sigframe(struct fxregs_state __user *fxbuf,
-					   struct _fpx_sw_bytes *fx_sw)
+static inline bool check_xstate_in_sigframe(struct fxregs_state __user *fxbuf,
+					    struct _fpx_sw_bytes *fx_sw)
 {
 	int min_xstate_size = sizeof(struct fxregs_state) +
 			      sizeof(struct xstate_header);
@@ -32,7 +32,7 @@ static inline int check_xstate_in_sigfra
 	unsigned int magic2;
 
 	if (__copy_from_user(fx_sw, &fxbuf->sw_reserved[0], sizeof(*fx_sw)))
-		return -EFAULT;
+		return false;
 
 	/* Check for the first magic field and other error scenarios. */
 	if (fx_sw->magic1 != FP_XSTATE_MAGIC1 ||
@@ -48,10 +48,10 @@ static inline int check_xstate_in_sigfra
 	 * in the memory layout.
 	 */
 	if (__get_user(magic2, (__u32 __user *)(fpstate + fx_sw->xstate_size)))
-		return -EFAULT;
+		return false;
 
 	if (likely(magic2 == FP_XSTATE_MAGIC2))
-		return 0;
+		return true;
 setfx:
 	trace_x86_fpu_xstate_check_failed(&current->thread.fpu);
 
@@ -59,7 +59,7 @@ static inline int check_xstate_in_sigfra
 	fx_sw->magic1 = 0;
 	fx_sw->xstate_size = sizeof(struct fxregs_state);
 	fx_sw->xfeatures = XFEATURE_MASK_FPSSE;
-	return 0;
+	return true;
 }
 
 /*
@@ -325,7 +325,7 @@ static bool __fpu_restore_sig(void __use
 	if (use_xsave()) {
 		struct _fpx_sw_bytes fx_sw_user;
 
-		if (check_xstate_in_sigframe(buf_fx, &fx_sw_user))
+		if (!check_xstate_in_sigframe(buf_fx, &fx_sw_user))
 			return false;
 
 		fx_only = !fx_sw_user.magic1;