linux-kernel - [tip:x86/urgent] x86/fpu: Avoid math_state_restore() without used_math() in __restore_xstate

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Message-ID: <tip-a7c80ebcac3068b1c3cb27d538d29558c30010c8@git.kernel.org>
Date:	Mon, 16 Mar 2015 05:07:11 -0700
From:	tip-bot for Oleg Nesterov <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	priikone@....fi, fenghua.yu@...el.com, bp@...e.de,
	stable@...r.kernel.org, tglx@...utronix.de, bp@...en8.de,
	dave.hansen@...el.com, sbsiddha@...il.com,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	luto@...capital.net, hpa@...or.com, oleg@...hat.com,
	quentin.casasnovas@...cle.com, mingo@...nel.org, riel@...hat.com
Subject: [tip:x86/urgent] x86/fpu: Avoid math_state_restore()
  without used_math() in __restore_xstate_sig()

Commit-ID:  a7c80ebcac3068b1c3cb27d538d29558c30010c8
Gitweb:     http://git.kernel.org/tip/a7c80ebcac3068b1c3cb27d538d29558c30010c8
Author:     Oleg Nesterov <oleg@...hat.com>
AuthorDate: Fri, 13 Mar 2015 09:53:09 +0100
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Fri, 13 Mar 2015 12:44:28 +0100

x86/fpu: Avoid math_state_restore() without used_math() in __restore_xstate_sig()

math_state_restore() assumes it is called with irqs disabled,
but this is not true if the caller is __restore_xstate_sig().

This means that if ia32_fxstate == T and __copy_from_user()
fails, __restore_xstate_sig() returns with irqs disabled too.

This triggers:

  BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:41
   dump_stack
   ___might_sleep
   ? _raw_spin_unlock_irqrestore
   __might_sleep
   down_read
   ? _raw_spin_unlock_irqrestore
   print_vma_addr
   signal_fault
   sys32_rt_sigreturn

Change __restore_xstate_sig() to call set_used_math()
unconditionally. This avoids enabling and disabling interrupts
in math_state_restore(). If copy_from_user() fails, we can
simply do fpu_finit() by hand.

[ Note: this is only the first step. math_state_restore() should
        not check used_math(), it should set this flag. While
	init_fpu() should simply die. ]

Signed-off-by: Oleg Nesterov <oleg@...hat.com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: <stable@...r.kernel.org>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Pekka Riikonen <priikone@....fi>
Cc: Quentin Casasnovas <quentin.casasnovas@...cle.com>
Cc: Rik van Riel <riel@...hat.com>
Cc: Suresh Siddha <sbsiddha@...il.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Link: http://lkml.kernel.org/r/20150307153844.GB25954@redhat.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/kernel/xsave.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/xsave.c b/arch/x86/kernel/xsave.c
index 34f66e5..cdc6cf9 100644
--- a/arch/x86/kernel/xsave.c
+++ b/arch/x86/kernel/xsave.c
@@ -379,7 +379,7 @@ int __restore_xstate_sig(void __user *buf, void __user *buf_fx, int size)
 		 * thread's fpu state, reconstruct fxstate from the fsave
 		 * header. Sanitize the copied state etc.
 		 */
-		struct xsave_struct *xsave = &tsk->thread.fpu.state->xsave;
+		struct fpu *fpu = &tsk->thread.fpu;
 		struct user_i387_ia32_struct env;
 		int err = 0;
 
@@ -393,14 +393,15 @@ int __restore_xstate_sig(void __user *buf, void __user *buf_fx, int size)
 		 */
 		drop_fpu(tsk);
 
-		if (__copy_from_user(xsave, buf_fx, state_size) ||
+		if (__copy_from_user(&fpu->state->xsave, buf_fx, state_size) ||
 		    __copy_from_user(&env, buf, sizeof(env))) {
+			fpu_finit(fpu);
 			err = -1;
 		} else {
 			sanitize_restored_xstate(tsk, &env, xstate_bv, fx_only);
-			set_used_math();
 		}
 
+		set_used_math();
 		if (use_eager_fpu()) {
 			preempt_disable();
 			math_state_restore();
--
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