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>,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
stable@vger.kernel.org
Subject: [patch V2 05/14] x86/fpu: Limit xstate copy size in xstateregs_set()
Date: Sun, 06 Jun 2021 01:47:47 +0200 [thread overview]
Message-ID: <20210606001323.429482447@linutronix.de> (raw)
In-Reply-To: 20210605234742.712464974@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;
next prev parent reply other threads:[~2021-06-06 0:32 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-05 23:47 [patch V2 00/14] x86/fpu: Mop up XSAVES and related damage Thomas Gleixner
2021-06-05 23:47 ` [patch V2 01/14] selftests/x86: Test signal frame XSTATE header corruption handling Thomas Gleixner
2021-06-05 23:47 ` [patch V2 02/14] x86/fpu: Prevent state corruption in __fpu__restore_sig() Thomas Gleixner
2021-06-07 8:49 ` Borislav Petkov
2021-06-05 23:47 ` [patch V2 03/14] x86/fpu: Invalidate FPU state after a failed XRSTOR from a user buffer Thomas Gleixner
2021-06-05 23:47 ` [patch V2 04/14] x86/pkru: Make the fpinit state update work Thomas Gleixner
2021-06-07 15:18 ` Borislav Petkov
2021-06-05 23:47 ` Thomas Gleixner [this message]
2021-06-05 23:47 ` [patch V2 06/14] x86/fpu: Sanitize xstateregs_set() Thomas Gleixner
2021-06-07 19:39 ` Borislav Petkov
2021-06-05 23:47 ` [patch V2 07/14] x86/fpu: Add address range checks to copy_user_to_xstate() Thomas Gleixner
2021-06-05 23:47 ` [patch V2 08/14] x86/fpu: Move inlines where they belong Thomas Gleixner
2021-06-05 23:47 ` [patch V2 09/14] x86/cpu: Sanitize X86_FEATURE_OSPKE Thomas Gleixner
2021-06-05 23:47 ` [patch V2 10/14] x86/fpu: Rename fpu__clear_all() to fpu_flush_thread() Thomas Gleixner
2021-06-05 23:47 ` [patch V2 11/14] x86/pkru: Provide pkru_get_init_value() Thomas Gleixner
2021-06-05 23:47 ` [patch V2 12/14] x86/fpu: Clean up the fpu__clear() variants Thomas Gleixner
2021-06-05 23:47 ` [patch V2 13/14] x86/fpu: Rename xstate copy functions which are related to UABI Thomas Gleixner
2021-06-05 23:47 ` [patch V2 14/14] x86/fpu: Deduplicate copy_uabi_from_user/kernel_to_xstate() Thomas Gleixner
2021-06-07 13:02 ` [patch V2 00/14] x86/fpu: Mop up XSAVES and related damage Thomas Gleixner
2021-06-07 13:36 ` Dave Hansen
2021-06-07 14:08 ` Thomas Gleixner
2021-06-07 16:38 ` Dave Hansen
2021-06-07 22:51 ` Thomas Gleixner
2021-06-08 14:47 ` Dave Hansen
2021-06-08 11:17 ` Thomas Gleixner
2021-06-08 12:27 ` Thomas Gleixner
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