[PATCH v3] spapr: Fail CAS if option vector table cannot be parsed

[PATCH v3] spapr: Fail CAS if option vector table cannot be parsed

[Greg Kurz]

Most of the option vector helpers have assertions to check their
arguments aren't null. The guest can provide an arbitrary address
for the CAS structure that would result in such null arguments.
Fail CAS with H_PARAMETER and print a warning instead of aborting
QEMU.

Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
---
v3: - drop ov_table check
v2: - print warnings
---
 hw/ppc/spapr_hcall.c |    8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
index f1799b1b707d..ffb14641f9d3 100644
--- a/hw/ppc/spapr_hcall.c
+++ b/hw/ppc/spapr_hcall.c
@@ -1703,7 +1703,15 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
     ov_table = addr;
 
     ov1_guest = spapr_ovec_parse_vector(ov_table, 1);
+    if (!ov1_guest) {
+        warn_report("guest didn't provide option vector 1");
+        return H_PARAMETER;
+    }
     ov5_guest = spapr_ovec_parse_vector(ov_table, 5);
+    if (!ov5_guest) {
+        warn_report("guest didn't provide option vector 5");
+        return H_PARAMETER;
+    }
     if (spapr_ovec_test(ov5_guest, OV5_MMU_BOTH)) {
         error_report("guest requested hash and radix MMU, which is invalid.");
         exit(EXIT_FAILURE);

Re: [PATCH v3] spapr: Fail CAS if option vector table cannot be parsed

[David Gibson]

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On Fri, Jan 17, 2020 at 10:15:52AM +0100, Greg Kurz wrote:
> Most of the option vector helpers have assertions to check their
> arguments aren't null. The guest can provide an arbitrary address
> for the CAS structure that would result in such null arguments.
> Fail CAS with H_PARAMETER and print a warning instead of aborting
> QEMU.
> 
> Signed-off-by: Greg Kurz <groug@kaod.org>
> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>

Applied to ppc-for-5.0, thanks.

> ---
> v3: - drop ov_table check
> v2: - print warnings
> ---
>  hw/ppc/spapr_hcall.c |    8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c
> index f1799b1b707d..ffb14641f9d3 100644
> --- a/hw/ppc/spapr_hcall.c
> +++ b/hw/ppc/spapr_hcall.c
> @@ -1703,7 +1703,15 @@ static target_ulong h_client_architecture_support(PowerPCCPU *cpu,
>      ov_table = addr;
>  
>      ov1_guest = spapr_ovec_parse_vector(ov_table, 1);
> +    if (!ov1_guest) {
> +        warn_report("guest didn't provide option vector 1");
> +        return H_PARAMETER;
> +    }
>      ov5_guest = spapr_ovec_parse_vector(ov_table, 5);
> +    if (!ov5_guest) {
> +        warn_report("guest didn't provide option vector 5");
> +        return H_PARAMETER;
> +    }
>      if (spapr_ovec_test(ov5_guest, OV5_MMU_BOTH)) {
>          error_report("guest requested hash and radix MMU, which is invalid.");
>          exit(EXIT_FAILURE);
> 

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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