linux-kernel - [PATCH 4.4 082/137] ARM: OMAP2+: Fix l2_inv_api

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Date:	Tue, 23 Feb 2016 19:33:33 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Kees Cook <keescook@...omium.org>,
	Laura Abbott <labbott@...hat.com>, Nishanth Menon <nm@...com>,
	Richard Woodruff <r-woodruff2@...com>,
	Russell King <linux@....linux.org.uk>,
	Tero Kristo <t-kristo@...com>, Nicolas Pitre <nico@...aro.org>,
	Tony Lindgren <tony@...mide.com>
Subject: [PATCH 4.4 082/137] ARM: OMAP2+: Fix l2_inv_api_params for rodata

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tony Lindgren <tony@...mide.com>

commit 0a0b13275558c32bbf6241464a7244b1ffd5afb3 upstream.

We don't want to write to .text, so let's move l2_inv_api_params
to .data and access it via a pointer.

Cc: Kees Cook <keescook@...omium.org>
Cc: Laura Abbott <labbott@...hat.com>
Cc: Nishanth Menon <nm@...com>
Cc: Richard Woodruff <r-woodruff2@...com>
Cc: Russell King <linux@....linux.org.uk>
Cc: Tero Kristo <t-kristo@...com>
Acked-by: Nicolas Pitre <nico@...aro.org>
Fixes: 1e6b48116a95 ("ARM: mm: allow non-text sections to be
non-executable")
Signed-off-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 arch/arm/mach-omap2/sleep34xx.S |   12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

--- a/arch/arm/mach-omap2/sleep34xx.S
+++ b/arch/arm/mach-omap2/sleep34xx.S
@@ -427,12 +427,14 @@ skipl2dis:
 	and	r1, #0x700
 	cmp	r1, #0x300
 	beq	l2_inv_gp
+	adr	r0, l2_inv_api_params_offset
+	ldr	r3, [r0]
+	add	r3, r3, r0		@ r3 points to dummy parameters
 	mov	r0, #40			@ set service ID for PPA
 	mov	r12, r0			@ copy secure Service ID in r12
 	mov	r1, #0			@ set task id for ROM code in r1
 	mov	r2, #4			@ set some flags in r2, r6
 	mov	r6, #0xff
-	adr	r3, l2_inv_api_params	@ r3 points to dummy parameters
 	dsb				@ data write barrier
 	dmb				@ data memory barrier
 	smc	#1			@ call SMI monitor (smi #1)
@@ -466,8 +468,8 @@ skipl2dis:
 	b	logic_l1_restore
 
 	.align
-l2_inv_api_params:
-	.word	0x1, 0x00
+l2_inv_api_params_offset:
+	.long	l2_inv_api_params - .
 l2_inv_gp:
 	/* Execute smi to invalidate L2 cache */
 	mov r12, #0x1			@ set up to invalidate L2
@@ -516,6 +518,10 @@ control_mem_rta:
 l2dis_3630:
 	.word	0
 
+	.data
+l2_inv_api_params:
+	.word	0x1, 0x00
+
 /*
  * Internal functions
  */