linux-kernel - [PATCH 067/208] x86/fpu: Use 'struct fpu' in fpstate_alloc

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Tue,  5 May 2015 18:24:47 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	linux-kernel@...r.kernel.org
Cc:	Andy Lutomirski <luto@...capital.net>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: [PATCH 067/208] x86/fpu: Use 'struct fpu' in fpstate_alloc_init()

Migrate this function to pure 'struct fpu' usage.

Reviewed-by: Borislav Petkov <bp@...en8.de>
Cc: Andy Lutomirski <luto@...capital.net>
Cc: Dave Hansen <dave.hansen@...ux.intel.com>
Cc: Fenghua Yu <fenghua.yu@...el.com>
Cc: H. Peter Anvin <hpa@...or.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Thomas Gleixner <tglx@...utronix.de>
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 arch/x86/include/asm/i387.h   |  2 +-
 arch/x86/kernel/fpu/core.c    | 13 ++++++-------
 arch/x86/kernel/fpu/xsave.c   |  2 +-
 arch/x86/kvm/x86.c            |  2 +-
 arch/x86/math-emu/fpu_entry.c |  2 +-
 5 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/arch/x86/include/asm/i387.h b/arch/x86/include/asm/i387.h
index e3b42c5379bc..38376cdf297c 100644
--- a/arch/x86/include/asm/i387.h
+++ b/arch/x86/include/asm/i387.h
@@ -18,7 +18,7 @@
 struct pt_regs;
 struct user_i387_struct;
 
-extern int fpstate_alloc_init(struct task_struct *curr);
+extern int fpstate_alloc_init(struct fpu *fpu);
 extern void fpstate_init(struct fpu *fpu);
 extern void fpu__flush_thread(struct task_struct *tsk);
 
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index 04a8322df8b5..76a6b1faa91f 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -263,12 +263,11 @@ int fpu__copy(struct fpu *dst_fpu, struct fpu *src_fpu)
  *
  * Can fail.
  */
-int fpstate_alloc_init(struct task_struct *curr)
+int fpstate_alloc_init(struct fpu *fpu)
 {
-	struct fpu *fpu = &curr->thread.fpu;
 	int ret;
 
-	if (WARN_ON_ONCE(curr != current))
+	if (WARN_ON_ONCE(fpu != &current->thread.fpu))
 		return -EINVAL;
 	if (WARN_ON_ONCE(fpu->fpstate_active))
 		return -EINVAL;
@@ -276,11 +275,11 @@ int fpstate_alloc_init(struct task_struct *curr)
 	/*
 	 * Memory allocation at the first usage of the FPU and other state.
 	 */
-	ret = fpstate_alloc(&curr->thread.fpu);
+	ret = fpstate_alloc(fpu);
 	if (ret)
 		return ret;
 
-	fpstate_init(&curr->thread.fpu);
+	fpstate_init(fpu);
 
 	/* Safe to do for the current task: */
 	fpu->fpstate_active = 1;
@@ -360,7 +359,7 @@ void fpu__restore(void)
 		/*
 		 * does a slab alloc which can sleep
 		 */
-		if (fpstate_alloc_init(tsk)) {
+		if (fpstate_alloc_init(fpu)) {
 			/*
 			 * ran out of memory!
 			 */
@@ -395,7 +394,7 @@ void fpu__flush_thread(struct task_struct *tsk)
 		fpstate_free(&tsk->thread.fpu);
 	} else if (!fpu->fpstate_active) {
 		/* kthread execs. TODO: cleanup this horror. */
-		if (WARN_ON(fpstate_alloc_init(tsk)))
+		if (WARN_ON(fpstate_alloc_init(fpu)))
 			force_sig(SIGKILL, tsk);
 		user_fpu_begin();
 		restore_init_xstate();
diff --git a/arch/x86/kernel/fpu/xsave.c b/arch/x86/kernel/fpu/xsave.c
index 3953cbf8d7e7..80b0c8fa50c5 100644
--- a/arch/x86/kernel/fpu/xsave.c
+++ b/arch/x86/kernel/fpu/xsave.c
@@ -350,7 +350,7 @@ int __restore_xstate_sig(void __user *buf, void __user *buf_fx, int size)
 	if (!access_ok(VERIFY_READ, buf, size))
 		return -EACCES;
 
-	if (!fpu->fpstate_active && fpstate_alloc_init(tsk))
+	if (!fpu->fpstate_active && fpstate_alloc_init(fpu))
 		return -1;
 
 	if (!static_cpu_has(X86_FEATURE_FPU))
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index bab8afb61dc1..479d4ce25081 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -6601,7 +6601,7 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
 	int r;
 	sigset_t sigsaved;
 
-	if (!fpu->fpstate_active && fpstate_alloc_init(current))
+	if (!fpu->fpstate_active && fpstate_alloc_init(fpu))
 		return -ENOMEM;
 
 	if (vcpu->sigset_active)
diff --git a/arch/x86/math-emu/fpu_entry.c b/arch/x86/math-emu/fpu_entry.c
index f1aac55d6a67..e394bcb4275d 100644
--- a/arch/x86/math-emu/fpu_entry.c
+++ b/arch/x86/math-emu/fpu_entry.c
@@ -150,7 +150,7 @@ void math_emulate(struct math_emu_info *info)
 	struct fpu *fpu = &current->thread.fpu;
 
 	if (!fpu->fpstate_active) {
-		if (fpstate_alloc_init(current)) {
+		if (fpstate_alloc_init(fpu)) {
 			do_group_exit(SIGKILL);
 			return;
 		}
-- 
2.1.0

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/