[Xen-changelog] [xen master] xen/arm: Don't allow dom0 to access to vpl011 UART0 memory range

[patchbot@xxxxxxx]

commit 0232cd2443b6bd3c7d3702ece51109207dd6bd1d
Author:     Julien Grall <julien.grall@xxxxxxxxxx>
AuthorDate: Fri May 10 03:17:48 2013 +0100
Commit:     Ian Campbell <ian.campbell@xxxxxxxxxx>
CommitDate: Fri May 10 14:17:05 2013 +0100

    xen/arm: Don't allow dom0 to access to vpl011 UART0 memory range
    
    As vpl011 UART is not initialized for dom 0, when the domain tries to 
access to
    this range, a segfault will occur in Xen. The right behaviour should be a 
data
    abort for the guest.
    
    Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
    Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
---
 xen/arch/arm/vpl011.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/xen/arch/arm/vpl011.c b/xen/arch/arm/vpl011.c
index 9472d0a..13ba623 100644
--- a/xen/arch/arm/vpl011.c
+++ b/xen/arch/arm/vpl011.c
@@ -85,7 +85,9 @@ static void uart0_print_char(char c)
 
 static int uart0_mmio_check(struct vcpu *v, paddr_t addr)
 {
-    return addr >= UART0_START && addr < UART0_END;
+    struct domain *d = v->domain;
+
+    return d->domain_id != 0 && addr >= UART0_START && addr < UART0_END;
 }
 
 static int uart0_mmio_read(struct vcpu *v, mmio_info_t *info)
--
generated by git-patchbot for /home/xen/git/xen.git#master

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