mirror of
https://aur.archlinux.org/linux-vfio.git
synced 2024-12-26 16:44:09 +00:00
66 lines
2.1 KiB
Diff
66 lines
2.1 KiB
Diff
From 885bad1e5f32bbf30787ead9578f8174047e6904 Mon Sep 17 00:00:00 2001
|
|
From: Yu-cheng Yu <yu-cheng.yu@intel.com>
|
|
Date: Thu, 17 Nov 2016 09:11:35 -0800
|
|
Subject: [PATCH] x86/fpu: Fix invalid FPU ptrace state after execve()
|
|
|
|
commit b22cbe404a9cc3c7949e380fa1861e31934c8978 upstream.
|
|
|
|
Robert O'Callahan reported that after an execve PTRACE_GETREGSET
|
|
NT_X86_XSTATE continues to return the pre-exec register values
|
|
until the exec'ed task modifies FPU state.
|
|
|
|
The test code is at:
|
|
|
|
https://bugzilla.redhat.com/attachment.cgi?id=1164286.
|
|
|
|
What is happening is fpu__clear() does not properly clear fpstate.
|
|
Fix it by doing just that.
|
|
|
|
Reported-by: Robert O'Callahan <robert@ocallahan.org>
|
|
Signed-off-by: Yu-cheng Yu <yu-cheng.yu@intel.com>
|
|
Cc: Andy Lutomirski <luto@kernel.org>
|
|
Cc: Borislav Petkov <bp@suse.de>
|
|
Cc: David Hansen <dave.hansen@linux.intel.com>
|
|
Cc: Fenghua Yu <fenghua.yu@intel.com>
|
|
Cc: Linus Torvalds <torvalds@linux-foundation.org>
|
|
Cc: Peter Zijlstra <peterz@infradead.org>
|
|
Cc: Ravi V. Shankar <ravi.v.shankar@intel.com>
|
|
Cc: Thomas Gleixner <tglx@linutronix.de>
|
|
Link: http://lkml.kernel.org/r/1479402695-6553-1-git-send-email-yu-cheng.yu@intel.com
|
|
Signed-off-by: Ingo Molnar <mingo@kernel.org>
|
|
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
|
|
---
|
|
arch/x86/kernel/fpu/core.c | 16 ++++++++--------
|
|
1 file changed, 8 insertions(+), 8 deletions(-)
|
|
|
|
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
|
|
index 3fc03a09a93b1710..c289e2f4a6e5b464 100644
|
|
--- a/arch/x86/kernel/fpu/core.c
|
|
+++ b/arch/x86/kernel/fpu/core.c
|
|
@@ -517,14 +517,14 @@ void fpu__clear(struct fpu *fpu)
|
|
{
|
|
WARN_ON_FPU(fpu != ¤t->thread.fpu); /* Almost certainly an anomaly */
|
|
|
|
- if (!use_eager_fpu() || !static_cpu_has(X86_FEATURE_FPU)) {
|
|
- /* FPU state will be reallocated lazily at the first use. */
|
|
- fpu__drop(fpu);
|
|
- } else {
|
|
- if (!fpu->fpstate_active) {
|
|
- fpu__activate_curr(fpu);
|
|
- user_fpu_begin();
|
|
- }
|
|
+ fpu__drop(fpu);
|
|
+
|
|
+ /*
|
|
+ * Make sure fpstate is cleared and initialized.
|
|
+ */
|
|
+ if (static_cpu_has(X86_FEATURE_FPU)) {
|
|
+ fpu__activate_curr(fpu);
|
|
+ user_fpu_begin();
|
|
copy_init_fpstate_to_fpregs();
|
|
}
|
|
}
|
|
--
|
|
2.10.2
|
|
|