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From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: x86@kernel.org, Andy Lutomirski <luto@kernel.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Fenghua Yu <fenghua.yu@intel.com>,
	Tony Luck <tony.luck@intel.com>,
	Yu-cheng Yu <yu-cheng.yu@intel.com>,
	stable@vger.kernel.org
Subject: [patch 4/8] x86/fpu: Limit xstate copy size in xstateregs_set()
Date: Wed, 02 Jun 2021 11:55:47 +0200	[thread overview]
Message-ID: <20210602101618.736036127@linutronix.de> (raw)
In-Reply-To: 20210602095543.149814064@linutronix.de

If the count argument is larger than the xstate size, this will happily
copy beyond the end of xstate.

Fixes: 91c3dba7dbc1 ("x86/fpu/xstate: Fix PTRACE frames for XSAVES")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: stable@vger.kernel.org
---
 arch/x86/kernel/fpu/regset.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/x86/kernel/fpu/regset.c
+++ b/arch/x86/kernel/fpu/regset.c
@@ -117,7 +117,7 @@ int xstateregs_set(struct task_struct *t
 	/*
 	 * A whole standard-format XSAVE buffer is needed:
 	 */
-	if ((pos != 0) || (count < fpu_user_xstate_size))
+	if (pos != 0 || count != fpu_user_xstate_size)
 		return -EFAULT;
 
 	xsave = &fpu->state.xsave;


  parent reply	other threads:[~2021-06-02 10:19 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-06-02  9:55 [patch 0/8] x86/fpu: Mop up XSAVES and related damage Thomas Gleixner
2021-06-02  9:55 ` [patch 1/8] selftests/x86: Test signal frame XSTATE header corruption handling Thomas Gleixner
2021-06-02 12:38   ` Borislav Petkov
2021-06-02 14:15     ` Thomas Gleixner
2021-06-03 13:16       ` Shuah Khan
2021-06-02 15:59   ` [patch V2 " Thomas Gleixner
2021-06-02 16:02     ` [patch V2a " Thomas Gleixner
2021-06-02  9:55 ` [patch 2/8] x86/fpu: Prevent state corruption in __fpu__restore_sig() Thomas Gleixner
2021-06-02 13:12   ` Borislav Petkov
2021-06-02 14:46     ` Thomas Gleixner
2021-06-02 15:58   ` [patch V2 " Thomas Gleixner
2021-06-02  9:55 ` [patch 3/8] x86/fpu: Invalidate FPU state after a failed XRSTOR from a user buffer Thomas Gleixner
2021-06-02 15:06   ` Borislav Petkov
2021-06-03 17:30     ` Andy Lutomirski
2021-06-03 19:28       ` Borislav Petkov
2021-06-02  9:55 ` Thomas Gleixner [this message]
2021-06-02 17:44   ` [patch 4/8] x86/fpu: Limit xstate copy size in xstateregs_set() Borislav Petkov
2021-06-02  9:55 ` [patch 5/8] x86/fpu: Sanitize xstateregs_set() Thomas Gleixner
2021-06-02 16:01   ` [patch V2 " Thomas Gleixner
2021-06-03 11:32     ` Borislav Petkov
2021-06-03 17:24   ` [patch " Andy Lutomirski
2021-06-02  9:55 ` [patch 6/8] x86/fpu: Add address range checks to copy_user_to_xstate() Thomas Gleixner
2021-06-02  9:55 ` [patch 7/8] x86/fpu: Clean up the fpu__clear() variants Thomas Gleixner
2021-06-02  9:55 ` [patch 8/8] x86/fpu: Deduplicate copy_xxx_to_xstate() Thomas Gleixner
2021-06-03 16:56   ` Andy Lutomirski
2021-06-02 21:28 ` [patch 0/8] x86/fpu: Mop up XSAVES and related damage Yu, Yu-cheng
2021-06-04 14:05   ` Thomas Gleixner
2021-06-04 16:27     ` Yu, Yu-cheng
2021-06-04 17:46     ` Dave Hansen
2021-06-04 18:14       ` Thomas Gleixner
2021-06-04 22:04 ` Dave Hansen
2021-06-05 10:18   ` Thomas Gleixner
2021-06-05 11:56     ` Thomas Gleixner

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