linux-kernel - [tip: x86/iopl] x86/ioperm: Remove bitmap if all permissions dropped

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Date:   Sat, 16 Nov 2019 11:51:22 -0000
From:   "tip-bot2 for Thomas Gleixner" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Andy Lutomirski <luto@...nel.org>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/iopl] x86/ioperm: Remove bitmap if all permissions dropped

The following commit has been merged into the x86/iopl branch of tip:

Commit-ID:     ea5f1cd7ab494f65f50f338299eabb40ad6a1767
Gitweb:        https://git.kernel.org/tip/ea5f1cd7ab494f65f50f338299eabb40ad6a1767
Author:        Thomas Gleixner <tglx@...utronix.de>
AuthorDate:    Mon, 11 Nov 2019 23:03:24 +01:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Sat, 16 Nov 2019 11:24:03 +01:00

x86/ioperm: Remove bitmap if all permissions dropped

If ioperm() results in a bitmap with all bits set (no permissions to any
I/O port), then handling that bitmap on context switch and exit to user
mode is pointless. Drop it.

Move the bitmap exit handling to the ioport code and reuse it for both the
thread exit path and dropping it. This allows to reuse this code for the
upcoming iopl() emulation.

Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Acked-by: Andy Lutomirski <luto@...nel.org>
---
 arch/x86/include/asm/io_bitmap.h |  2 ++
 arch/x86/kernel/ioport.c         | 19 ++++++++++++++++++-
 arch/x86/kernel/process.c        | 17 +++--------------
 3 files changed, 23 insertions(+), 15 deletions(-)

diff --git a/arch/x86/include/asm/io_bitmap.h b/arch/x86/include/asm/io_bitmap.h
index 6d82a37..784a88e 100644
--- a/arch/x86/include/asm/io_bitmap.h
+++ b/arch/x86/include/asm/io_bitmap.h
@@ -11,6 +11,8 @@ struct io_bitmap {
 	unsigned long	bitmap[IO_BITMAP_LONGS];
 };
 
+void io_bitmap_exit(void);
+
 void tss_update_io_bitmap(void);
 
 #endif
diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c
index 198bead..f9fc69a 100644
--- a/arch/x86/kernel/ioport.c
+++ b/arch/x86/kernel/ioport.c
@@ -16,6 +16,18 @@
 
 static atomic64_t io_bitmap_sequence;
 
+void io_bitmap_exit(void)
+{
+	struct io_bitmap *iobm = current->thread.io_bitmap;
+
+	current->thread.io_bitmap = NULL;
+	clear_thread_flag(TIF_IO_BITMAP);
+	preempt_disable();
+	tss_update_io_bitmap();
+	preempt_enable();
+	kfree(iobm);
+}
+
 /*
  * this changes the io permissions bitmap in the current task.
  */
@@ -61,11 +73,16 @@ long ksys_ioperm(unsigned long from, unsigned long num, int turn_on)
 	 * Search for a (possibly new) maximum. This is simple and stupid,
 	 * to keep it obviously correct:
 	 */
-	max_long = 0;
+	max_long = UINT_MAX;
 	for (i = 0; i < IO_BITMAP_LONGS; i++) {
 		if (iobm->bitmap[i] != ~0UL)
 			max_long = i;
 	}
+	/* All permissions dropped? */
+	if (max_long == UINT_MAX) {
+		io_bitmap_exit();
+		return 0;
+	}
 
 	iobm->max = (max_long + 1) * sizeof(unsigned long);
 
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c
index 108af91..7ba4d54 100644
--- a/arch/x86/kernel/process.c
+++ b/arch/x86/kernel/process.c
@@ -102,21 +102,10 @@ int arch_dup_task_struct(struct task_struct *dst, struct task_struct *src)
 void exit_thread(struct task_struct *tsk)
 {
 	struct thread_struct *t = &tsk->thread;
-	struct io_bitmap *iobm = t->io_bitmap;
 	struct fpu *fpu = &t->fpu;
-	struct tss_struct *tss;
-
-	if (iobm) {
-		preempt_disable();
-		tss = this_cpu_ptr(&cpu_tss_rw);
-
-		t->io_bitmap = NULL;
-		clear_thread_flag(TIF_IO_BITMAP);
-		/* Invalidate the io bitmap base in the TSS */
-		tss->x86_tss.io_bitmap_base = IO_BITMAP_OFFSET_INVALID;
-		preempt_enable();
-		kfree(iobm);
-	}
+
+	if (test_thread_flag(TIF_IO_BITMAP))
+		io_bitmap_exit();
 
 	free_vm86(t);