[Xen-changelog] [xen stable-4.5] xen/arm: vgic-v2: message in the emulation code should be rate-limited

[patchbot@xxxxxxx]

commit 896437d6305879fab0f8c4f1d7292d1db0de6d97
Author:     Julien Grall <julien.grall@xxxxxxxxxx>
AuthorDate: Mon Jan 19 12:59:42 2015 +0000
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Thu Jan 29 15:57:19 2015 +0000

    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.
    
    This is XSA-118.
    
    Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
    (cherry picked from commit d0b2caa80fccafbb131b28b7b8488001d82ab4bf)
---
 xen/arch/arm/vgic-v2.c |   40 +++++++++++++++++++++++-----------------
 1 files changed, 23 insertions(+), 17 deletions(-)

diff --git a/xen/arch/arm/vgic-v2.c b/xen/arch/arm/vgic-v2.c
index 1369f78..477f05a 100644
--- a/xen/arch/arm/vgic-v2.c
+++ b/xen/arch/arm/vgic-v2.c
@@ -196,7 +196,7 @@ 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 */
@@ -213,14 +213,14 @@ 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;
 
@@ -324,14 +324,16 @@ 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:
@@ -450,14 +452,16 @@ 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 */
@@ -482,14 +486,16 @@ 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;
 
--
generated by git-patchbot for /home/xen/git/xen.git#stable-4.5

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