From: Andy Green <andy@warmcat.com>
To: "De Lara Guarch, Pablo" <pablo.de.lara.guarch@intel.com>,
"dev@dpdk.org" <dev@dpdk.org>
Cc: "Pattan, Reshma" <reshma.pattan@intel.com>,
"stable@dpdk.org" <stable@dpdk.org>
Subject: Re: [dpdk-dev] [PATCH v4 16/18] app/proc-info: sprintf overrun bug
Date: Sat, 12 May 2018 09:33:17 +0800 [thread overview]
Message-ID: <e47972c5-9308-6cf5-05c1-2a7b385ab01d@warmcat.com> (raw)
In-Reply-To: <E115CCD9D858EF4F90C690B0DCB4D8976CD08D09@IRSMSX108.ger.corp.intel.com>
On 05/11/2018 08:26 PM, De Lara Guarch, Pablo wrote:
>
>
>> -----Original Message-----
>> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Andy Green
>> Sent: Friday, May 11, 2018 2:47 AM
>> To: dev@dpdk.org
>> Subject: [dpdk-dev] [PATCH v4 16/18] app/proc-info: sprintf overrun bug
>>
>> /home/agreen/projects/dpdk/app/proc-info/main.c: In function
>> ‘nic_xstats_display’:
>> /home/agreen/projects/dpdk/app/proc-info/main.c:495:45:
>> error: ‘%s’ directive writing up to 255 bytes into a region of size between 165
>> and 232 [-Werror=format-overflow=]
>> sprintf(buf, "PUTVAL %s/dpdkstat-port.%u/%s-%s N:%"
>> ^~
>> PRIu64"\n", host_id, port_id, counter_type,
>> ~~~~~~~~~~~~
>> /home/agreen/projects/dpdk/app/proc-info/main.c:495:4: note:
>> ‘sprintf’ output between 31 and 435 bytes into a destination of size 256
>> sprintf(buf, "PUTVAL %s/dpdkstat-port.%u/%s-%s N:%"
>> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> PRIu64"\n", host_id, port_id, counter_type,
>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>> xstats_names[i].name, values[i]);
>>
>> Signed-off-by: Andy Green <andy@warmcat.com>
>> ---
>> app/proc-info/main.c | 9 +++++++--
>> 1 file changed, 7 insertions(+), 2 deletions(-)
>>
>> diff --git a/app/proc-info/main.c b/app/proc-info/main.c index
>> 539e13243..df46c235e 100644
>> --- a/app/proc-info/main.c
>> +++ b/app/proc-info/main.c
>> @@ -488,14 +488,19 @@ nic_xstats_display(uint16_t port_id)
>> if (enable_collectd_format) {
>> char counter_type[MAX_STRING_LEN];
>> char buf[MAX_STRING_LEN];
>> + size_t n;
>>
>> collectd_resolve_cnt_type(counter_type,
>> sizeof(counter_type),
>> xstats_names[i].name);
>> - sprintf(buf, "PUTVAL %s/dpdkstat-port.%u/%s-%s N:%"
>> + n = snprintf(buf, MAX_STRING_LEN,
>> + "PUTVAL %s/dpdkstat-port.%u/%s-%s N:%"
>> PRIu64"\n", host_id, port_id, counter_type,
>> xstats_names[i].name, values[i]);
>> - ret = write(stdout_fd, buf, strlen(buf));
>> + buf[sizeof(buf) - 1] = '\0';
>
> No need to NULL terminate, since snprintf already does it.
OK.
>> + if (n > sizeof(buf) - 1)
>> + n = sizeof(buf) - 1;
>
> If (n > sizeof(buf) -1 ), it means that there wasn't enough space to write all the data,
> So shouldn't we return an error here?
It's just logging stuff, policy about truncated overlength logs could go
either way.
Prior to this patch its policy was to corrupt your stack if overlength
;-) so I think it's moving it on in the right direction merely
truncating it.
-Andy
>> + ret = write(stdout_fd, buf, n);
>> if (ret < 0)
>> goto err;
>> } else {
>
> Missing fixes line and CC stable.
>
> Fixes: 2deb6b5246d7 ("app/procinfo: add collectd format and host id")
> Cc: stable@dpdk.org
>
next prev parent reply other threads:[~2018-05-12 1:33 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-11 1:45 [dpdk-dev] [PATCH v4 00/18] Fix default build on gcc8.0.1 Andy Green
2018-05-11 1:45 ` [dpdk-dev] [PATCH v4 01/18] devtools/check-git: provide more generic grep pattern Andy Green
2018-05-11 8:11 ` De Lara Guarch, Pablo
2018-05-11 1:45 ` [dpdk-dev] [PATCH v4 02/18] net/nfp: solve buffer overflow Andy Green
2018-05-11 8:58 ` De Lara Guarch, Pablo
2018-05-11 10:13 ` De Lara Guarch, Pablo
2018-05-11 1:45 ` [dpdk-dev] [PATCH v4 03/18] bus/pci: replace strncpy dangerous code Andy Green
2018-05-11 8:17 ` De Lara Guarch, Pablo
2018-05-11 1:45 ` [dpdk-dev] [PATCH v4 04/18] bus/dpaa: solve inconsistent struct alignment Andy Green
2018-05-11 8:26 ` De Lara Guarch, Pablo
2018-05-11 1:45 ` [dpdk-dev] [PATCH v4 05/18] net/axgbe: solve broken eeprom string comp Andy Green
2018-05-11 10:09 ` De Lara Guarch, Pablo
2018-05-11 1:45 ` [dpdk-dev] [PATCH v4 06/18] net/nfp/nfpcore: solve strncpy misuse Andy Green
2018-05-11 10:26 ` De Lara Guarch, Pablo
2018-05-11 1:45 ` [dpdk-dev] [PATCH v4 07/18] net/nfp/nfpcore: off-by-one and no NUL on strncpy use Andy Green
2018-05-11 10:33 ` De Lara Guarch, Pablo
2018-05-12 1:17 ` Andy Green
2018-05-11 1:45 ` [dpdk-dev] [PATCH v4 08/18] net/nfp: don't memcpy out of source range Andy Green
2018-05-11 10:36 ` De Lara Guarch, Pablo
2018-05-11 1:46 ` [dpdk-dev] [PATCH v4 09/18] net/qede: strncpy length constant and NUL Andy Green
2018-05-11 10:43 ` De Lara Guarch, Pablo
2018-05-11 10:48 ` Andy Green
2018-05-11 12:48 ` De Lara Guarch, Pablo
2018-05-11 13:38 ` Andy Green
2018-05-11 15:14 ` De Lara Guarch, Pablo
2018-05-11 17:13 ` Shaikh, Shahed
2018-05-11 1:46 ` [dpdk-dev] [PATCH v4 10/18] net/qede: solve broken strncpy Andy Green
2018-05-11 10:47 ` De Lara Guarch, Pablo
2018-05-11 1:46 ` [dpdk-dev] [PATCH v4 11/18] net/sfc: correct strncpy length Andy Green
2018-05-11 8:11 ` Andrew Rybchenko
2018-05-11 10:51 ` De Lara Guarch, Pablo
2018-05-12 1:21 ` Andy Green
2018-05-11 1:46 ` [dpdk-dev] [PATCH v4 12/18] net/sfc: solve strncpy size and NUL Andy Green
2018-05-11 8:13 ` Andrew Rybchenko
2018-05-11 10:55 ` De Lara Guarch, Pablo
2018-05-12 1:24 ` Andy Green
2018-05-11 1:46 ` [dpdk-dev] [PATCH v4 13/18] net/vdev_netvsc: readlink inputs cannot be aliased Andy Green
2018-05-11 15:39 ` De Lara Guarch, Pablo
2018-05-11 1:46 ` [dpdk-dev] [PATCH v4 14/18] net/vdev_netvsc: 3 x strncpy misuse Andy Green
2018-05-11 10:58 ` De Lara Guarch, Pablo
2018-05-11 1:46 ` [dpdk-dev] [PATCH v4 15/18] app: can't find include Andy Green
2018-05-11 11:04 ` De Lara Guarch, Pablo
2018-05-11 11:12 ` Andy Green
2018-05-11 13:20 ` De Lara Guarch, Pablo
2018-05-12 0:52 ` Andy Green
2018-05-11 1:46 ` [dpdk-dev] [PATCH v4 16/18] app/proc-info: sprintf overrun bug Andy Green
2018-05-11 12:26 ` De Lara Guarch, Pablo
2018-05-12 1:33 ` Andy Green [this message]
2018-05-11 1:46 ` [dpdk-dev] [PATCH v4 17/18] app/test-bbdev: strcpy ok for allocated string Andy Green
2018-05-11 12:55 ` De Lara Guarch, Pablo
2018-05-11 1:46 ` [dpdk-dev] [PATCH v4 18/18] " Andy Green
2018-05-11 13:02 ` De Lara Guarch, Pablo
2018-05-12 1:39 ` Andy Green
2018-05-11 11:14 ` [dpdk-dev] [PATCH v4 00/18] Fix default build on gcc8.0.1 Neil Horman
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