linux-kernel - Re: [PATCH v9 1/4] perf,kvm/{x86,s390}: Remove dependency on uapi/kvm

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: <5615443F.7030909@gmail.com>
Date:	Wed, 7 Oct 2015 10:11:43 -0600
From:	David Ahern <dsahern@...il.com>
To:	Hemant Kumar <hemant@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org
Cc:	linuxppc-dev@...ts.ozlabs.org, acme@...nel.org,
	scottwood@...escale.com, sukadev@...ux.vnet.ibm.com,
	naveen.n.rao@...ux.vnet.ibm.com, mpe@...erman.id.au,
	paulus@...ba.org, mingo@...hat.com, yarygin@...ux.vnet.ibm.com,
	borntraeger@...ibm.com, srikar@...ux.vnet.ibm.com
Subject: Re: [PATCH v9 1/4] perf,kvm/{x86,s390}: Remove dependency on
 uapi/kvm_perf.h

On 10/6/15 8:25 PM, Hemant Kumar wrote:
> @@ -358,7 +357,12 @@ static bool handle_end_event(struct perf_kvm_stat *kvm,
>   	time_diff = sample->time - time_begin;
>
>   	if (kvm->duration && time_diff > kvm->duration) {
> -		char decode[DECODE_STR_LEN];
> +		char *decode = zalloc(decode_str_len);

decode can still be a stack variable even with variable length.

> +
> +		if (!decode) {
> +			pr_err("Not enough memory\n");
> +			return false;
> +		}
>
>   		kvm->events_ops->decode_key(kvm, &event->key, decode);
>   		if (!skip_event(decode)) {
> @@ -366,6 +370,7 @@ static bool handle_end_event(struct perf_kvm_stat *kvm,
>   				 sample->time, sample->pid, vcpu_record->vcpu_id,
>   				 decode, time_diff/1000);
>   		}
> +		free(decode);
>   	}
>
>   	return update_kvm_event(event, vcpu, time_diff);
> @@ -386,7 +391,8 @@ struct vcpu_event_record *per_vcpu_record(struct thread *thread,

-----8<-----

> @@ -575,7 +581,7 @@ static void show_timeofday(void)
>
>   static void print_result(struct perf_kvm_stat *kvm)
>   {
> -	char decode[DECODE_STR_LEN];
> +	char *decode;

and a stack variable here too.

David
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/