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From e8fa469595e29b2dbe6dde3a77ee2ea2d9e93283 Mon Sep 17 00:00:00 2001
From: Julien Grall <julien.grall@linaro.org>
Date: Mon, 19 Jan 2015 12:59:42 +0000
Subject: [PATCH 2/2] xen/arm: vgic-v2: message in the emulation code should be
rate-limited
printk is not rated-limited by default. Therefore a malicious guest may
be able to flood the Xen console.
If we use gdprintk, unecessary information will be printed such as the
filename and the line. Instead use XENLOG_G_ERR combine with %pv.
Signed-off-by: Julien Grall <julien.grall@linaro.org>
---
xen/arch/arm/vgic-v2.c | 40 +++++++++++++++++++++++-----------------
1 file changed, 23 insertions(+), 17 deletions(-)
diff --git a/xen/arch/arm/vgic-v2.c b/xen/arch/arm/vgic-v2.c
index 9dc9a20..3b87f54 100644
--- a/xen/arch/arm/vgic-v2.c
+++ b/xen/arch/arm/vgic-v2.c
@@ -198,7 +198,7 @@ static int vgic_v2_distr_mmio_read(struct vcpu *v, mmio_info_t *info)
case GICD_ICPIDR2:
if ( dabt.size != DABT_WORD ) goto bad_width;
- printk("vGICD: unhandled read from ICPIDR2\n");
+ printk(XENLOG_G_ERR "%pv: vGICD: unhandled read from ICPIDR2\n", v);
return 0;
/* Implementation defined -- read as zero */
@@ -215,14 +215,14 @@ static int vgic_v2_distr_mmio_read(struct vcpu *v, mmio_info_t *info)
goto read_as_zero;
default:
- printk("vGICD: unhandled read r%d offset %#08x\n",
- dabt.reg, gicd_reg);
+ printk(XENLOG_G_ERR "%pv: vGICD: unhandled read r%d offset %#08x\n",
+ v, dabt.reg, gicd_reg);
return 0;
}
bad_width:
- printk("vGICD: bad read width %d r%d offset %#08x\n",
- dabt.size, dabt.reg, gicd_reg);
+ printk(XENLOG_G_ERR "%pv: vGICD: bad read width %d r%d offset %#08x\n",
+ v, dabt.size, dabt.reg, gicd_reg);
domain_crash_synchronous();
return 0;
@@ -331,14 +331,16 @@ static int vgic_v2_distr_mmio_write(struct vcpu *v, mmio_info_t *info)
case GICD_ISPENDR ... GICD_ISPENDRN:
if ( dabt.size != DABT_BYTE && dabt.size != DABT_WORD ) goto bad_width;
- printk("vGICD: unhandled %s write %#"PRIregister" to ISPENDR%d\n",
- dabt.size ? "word" : "byte", *r, gicd_reg - GICD_ISPENDR);
+ printk(XENLOG_G_ERR
+ "%pv: vGICD: unhandled %s write %#"PRIregister" to ISPENDR%d\n",
+ v, dabt.size ? "word" : "byte", *r, gicd_reg - GICD_ISPENDR);
return 0;
case GICD_ICPENDR ... GICD_ICPENDRN:
if ( dabt.size != DABT_BYTE && dabt.size != DABT_WORD ) goto bad_width;
- printk("vGICD: unhandled %s write %#"PRIregister" to ICPENDR%d\n",
- dabt.size ? "word" : "byte", *r, gicd_reg - GICD_ICPENDR);
+ printk(XENLOG_G_ERR
+ "%pv: vGICD: unhandled %s write %#"PRIregister" to ICPENDR%d\n",
+ v, dabt.size ? "word" : "byte", *r, gicd_reg - GICD_ICPENDR);
return 0;
case GICD_ISACTIVER ... GICD_ISACTIVERN:
@@ -457,14 +459,16 @@ static int vgic_v2_distr_mmio_write(struct vcpu *v, mmio_info_t *info)
case GICD_CPENDSGIR ... GICD_CPENDSGIRN:
if ( dabt.size != DABT_BYTE && dabt.size != DABT_WORD ) goto bad_width;
- printk("vGICD: unhandled %s write %#"PRIregister" to ICPENDSGIR%d\n",
- dabt.size ? "word" : "byte", *r, gicd_reg - GICD_CPENDSGIR);
+ printk(XENLOG_G_ERR
+ "%pv: vGICD: unhandled %s write %#"PRIregister" to ICPENDSGIR%d\n",
+ v, dabt.size ? "word" : "byte", *r, gicd_reg - GICD_CPENDSGIR);
return 0;
case GICD_SPENDSGIR ... GICD_SPENDSGIRN:
if ( dabt.size != DABT_BYTE && dabt.size != DABT_WORD ) goto bad_width;
- printk("vGICD: unhandled %s write %#"PRIregister" to ISPENDSGIR%d\n",
- dabt.size ? "word" : "byte", *r, gicd_reg - GICD_SPENDSGIR);
+ printk(XENLOG_G_ERR
+ "%pv: vGICD: unhandled %s write %#"PRIregister" to ISPENDSGIR%d\n",
+ v, dabt.size ? "word" : "byte", *r, gicd_reg - GICD_SPENDSGIR);
return 0;
/* Implementation defined -- write ignored */
@@ -489,14 +493,16 @@ static int vgic_v2_distr_mmio_write(struct vcpu *v, mmio_info_t *info)
goto write_ignore;
default:
- printk("vGICD: unhandled write r%d=%"PRIregister" offset %#08x\n",
- dabt.reg, *r, gicd_reg);
+ printk(XENLOG_G_ERR
+ "%pv: vGICD: unhandled write r%d=%"PRIregister" offset %#08x\n",
+ v, dabt.reg, *r, gicd_reg);
return 0;
}
bad_width:
- printk("vGICD: bad write width %d r%d=%"PRIregister" offset %#08x\n",
- dabt.size, dabt.reg, *r, gicd_reg);
+ printk(XENLOG_G_ERR
+ "%pv: vGICD: bad write width %d r%d=%"PRIregister" offset %#08x\n",
+ v, dabt.size, dabt.reg, *r, gicd_reg);
domain_crash_synchronous();
return 0;
--
2.1.4
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