linux-kernel - Re: [RFC][PATCH 01/12 v3] x86/kvm/tracing: Use helper function trace_seq_buffer

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <C664BE5A-1B30-454F-B7B8-DE4D5F5DF4B8@intel.com>
Date:	Tue, 4 Nov 2014 17:17:08 +0000
From:	"Rustad, Mark D" <mark.d.rustad@...el.com>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Kosina <jkosina@...e.cz>, Petr Mladek <pmladek@...e.cz>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [RFC][PATCH 01/12 v3] x86/kvm/tracing: Use helper function
 trace_seq_buffer_ptr()

On Nov 4, 2014, at 7:52 AM, Steven Rostedt <rostedt@...dmis.org> wrote:

> From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
> 
> To allow for the restructiong of the trace_seq code, we need users
> of it to use the helper functions instead of accessing the internals
> of the trace_seq structure itself.
> 
> Cc: Mark Rustad <mark.d.rustad@...el.com>
> Cc: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> ---
> arch/x86/kvm/mmutrace.h | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/x86/kvm/mmutrace.h b/arch/x86/kvm/mmutrace.h
> index 5aaf35641768..ce463a9cc8fb 100644
> --- a/arch/x86/kvm/mmutrace.h
> +++ b/arch/x86/kvm/mmutrace.h
> @@ -22,7 +22,7 @@
> 	__entry->unsync = sp->unsync;
> 
> #define KVM_MMU_PAGE_PRINTK() ({				        \
> -	const u32 saved_len = p->len;					\
> +	const char *saved_ptr = trace_seq_buffer_ptr(p);		\

I think the above should not be a const char *, because the location pointed to is surely being changed. It should either be a char * or a char * const.

> 	static const char *access_str[] = {			        \
> 		"---", "--x", "w--", "w-x", "-u-", "-ux", "wu-", "wux"  \
> 	};							        \
> @@ -41,7 +41,7 @@
> 			 role.nxe ? "" : "!",				\
> 			 __entry->root_count,				\
> 			 __entry->unsync ? "unsync" : "sync", 0);	\
> -	p->buffer + saved_len;						\
> +	saved_ptr;							\
> 		})
> 
> #define kvm_mmu_trace_pferr_flags       \
> -- 
> 2.1.1

-- 
Mark Rustad, Networking Division, Intel Corporation


Download attachment "signature.asc" of type "application/pgp-signature" (842 bytes)