linux-kernel - [tip: x86/fpu] x86/fpu/xstate: Use fpstate for xsave_to_user

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Date:   Thu, 21 Oct 2021 15:12:26 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>, Borislav Petkov <bp@...e.de>,
        x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: x86/fpu] x86/fpu/xstate: Use fpstate for xsave_to_user_sigframe()

The following commit has been merged into the x86/fpu branch of tip:

Commit-ID:     0b2d39aa03574eb401cdfaac2f483a6f68173355
Gitweb:        https://git.kernel.org/tip/0b2d39aa03574eb401cdfaac2f483a6f68173355
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Wed, 13 Oct 2021 16:55:51 +02:00
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Thu, 21 Oct 2021 14:04:46 +02:00

x86/fpu/xstate: Use fpstate for xsave_to_user_sigframe()

With dynamically enabled features the sigframe code must know the features
which are enabled for the task. Get them from fpstate.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Borislav Petkov <bp@...e.de>
Link: https://lkml.kernel.org/r/20211013145323.077781448@linutronix.de
---
 arch/x86/kernel/fpu/xstate.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/fpu/xstate.h b/arch/x86/kernel/fpu/xstate.h
index 24a1479..3e9eaf9 100644
--- a/arch/x86/kernel/fpu/xstate.h
+++ b/arch/x86/kernel/fpu/xstate.h
@@ -149,7 +149,7 @@ static inline int xsave_to_user_sigframe(struct xregs_state __user *buf)
 	 * internally, e.g. PKRU. That's user space ABI and also required
 	 * to allow the signal handler to modify PKRU.
 	 */
-	u64 mask = xfeatures_mask_uabi();
+	u64 mask = current->thread.fpu.fpstate->user_xfeatures;
 	u32 lmask = mask;
 	u32 hmask = mask >> 32;
 	int err;