* [PATCH] x86/traps: replace ASSERT() checking array bounds
@ 2016-11-07 9:25 Jan Beulich
2016-11-07 10:22 ` Andrew Cooper
0 siblings, 1 reply; 3+ messages in thread
From: Jan Beulich @ 2016-11-07 9:25 UTC (permalink / raw)
To: xen-devel; +Cc: Andrew Cooper, Wei Liu
[-- Attachment #1: Type: text/plain, Size: 698 bytes --]
Avoid out of bounds accesses on non-debug builds.
Coverity ID: 1055744
Signed-off-by: Jan Beulich <jbeulich@suse.com>
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -3764,7 +3764,11 @@ void async_exception_cleanup(struct vcpu
if ( (curr->async_exception_mask ^
curr->async_exception_state(trap).old_mask) == (1 << trap) )
break;
- ASSERT(trap <= VCPU_TRAP_LAST);
+ if ( unlikely(trap > VCPU_TRAP_LAST) )
+ {
+ ASSERT_UNREACHABLE();
+ return;
+ }
/* Restore previous asynchronous exception mask. */
curr->async_exception_mask = curr->async_exception_state(trap).old_mask;
[-- Attachment #2: x86-async-exception-assert.patch --]
[-- Type: text/plain, Size: 745 bytes --]
x86/traps: replace ASSERT() checking array bounds
Avoid out of bounds accesses on non-debug builds.
Coverity ID: 1055744
Signed-off-by: Jan Beulich <jbeulich@suse.com>
--- a/xen/arch/x86/traps.c
+++ b/xen/arch/x86/traps.c
@@ -3764,7 +3764,11 @@ void async_exception_cleanup(struct vcpu
if ( (curr->async_exception_mask ^
curr->async_exception_state(trap).old_mask) == (1 << trap) )
break;
- ASSERT(trap <= VCPU_TRAP_LAST);
+ if ( unlikely(trap > VCPU_TRAP_LAST) )
+ {
+ ASSERT_UNREACHABLE();
+ return;
+ }
/* Restore previous asynchronous exception mask. */
curr->async_exception_mask = curr->async_exception_state(trap).old_mask;
[-- Attachment #3: Type: text/plain, Size: 127 bytes --]
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] x86/traps: replace ASSERT() checking array bounds
2016-11-07 9:25 [PATCH] x86/traps: replace ASSERT() checking array bounds Jan Beulich
@ 2016-11-07 10:22 ` Andrew Cooper
2016-11-07 10:41 ` Wei Liu
0 siblings, 1 reply; 3+ messages in thread
From: Andrew Cooper @ 2016-11-07 10:22 UTC (permalink / raw)
To: Jan Beulich, xen-devel; +Cc: Wei Liu
On 07/11/16 09:25, Jan Beulich wrote:
> Avoid out of bounds accesses on non-debug builds.
>
> Coverity ID: 1055744
>
> Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
>
> --- a/xen/arch/x86/traps.c
> +++ b/xen/arch/x86/traps.c
> @@ -3764,7 +3764,11 @@ void async_exception_cleanup(struct vcpu
> if ( (curr->async_exception_mask ^
> curr->async_exception_state(trap).old_mask) == (1 << trap) )
> break;
> - ASSERT(trap <= VCPU_TRAP_LAST);
> + if ( unlikely(trap > VCPU_TRAP_LAST) )
> + {
> + ASSERT_UNREACHABLE();
> + return;
> + }
>
> /* Restore previous asynchronous exception mask. */
> curr->async_exception_mask = curr->async_exception_state(trap).old_mask;
>
>
>
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^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] x86/traps: replace ASSERT() checking array bounds
2016-11-07 10:22 ` Andrew Cooper
@ 2016-11-07 10:41 ` Wei Liu
0 siblings, 0 replies; 3+ messages in thread
From: Wei Liu @ 2016-11-07 10:41 UTC (permalink / raw)
To: Andrew Cooper; +Cc: xen-devel, Wei Liu, Jan Beulich
On Mon, Nov 07, 2016 at 10:22:56AM +0000, Andrew Cooper wrote:
> On 07/11/16 09:25, Jan Beulich wrote:
> > Avoid out of bounds accesses on non-debug builds.
> >
> > Coverity ID: 1055744
> >
> > Signed-off-by: Jan Beulich <jbeulich@suse.com>
>
> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
>
Release-acked-by: Wei Liu <wei.liu2@citrix.com>
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^ permalink raw reply [flat|nested] 3+ messages in thread
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2016-11-07 9:25 [PATCH] x86/traps: replace ASSERT() checking array bounds Jan Beulich
2016-11-07 10:22 ` Andrew Cooper
2016-11-07 10:41 ` Wei Liu
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