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From: Bruce Richardson <bruce.richardson@intel.com>
To: Chaitanya Babu Talluri <tallurix.chaitanya.babu@intel.com>
Cc: dev@dpdk.org, reshma.pattan@intel.com,
	jananeex.m.parthasarathy@intel.com, rmody@marvell.com,
	shshaikh@marvell.com, beilei.xing@intel.com,
	qi.z.zhang@intel.com, alejandro.lucero@netronome.com,
	pablo.de.lara.guarch@intel.com, declan.doherty@intel.com,
	stable@dpdk.org
Subject: Re: [dpdk-stable] [dpdk-dev] [PATCH v3] drivers: fix to replace strcat with strlcat
Date: Wed, 27 Feb 2019 09:49:57 +0000	[thread overview]
Message-ID: <20190227094957.GB91912@bricha3-MOBL.ger.corp.intel.com> (raw)
In-Reply-To: <1551247371-32624-1-git-send-email-tallurix.chaitanya.babu@intel.com>

On Wed, Feb 27, 2019 at 06:02:51AM +0000, Chaitanya Babu Talluri wrote:
> Strcat does not check the destination length and there might be
> chances of string overflow so instead of strcat, strlcat is used.
> 
> Fixes: 540a211084 ("bnx2x: driver core")
> Fixes: e163c18a15 ("net/i40e: update ptype and pctype info")
> Fixes: ef28aa96e5 ("net/nfp: support multiprocess")
> Fixes: 6f4eec2565 ("test/crypto: enhance scheduler unit tests")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Chaitanya Babu Talluri <tallurix.chaitanya.babu@intel.com>
> ---
> v3: Instead of strncat, used strlcat.
> v2: Instead of strncat, used snprintf.
> ---
>  drivers/net/bnx2x/bnx2x.c                  |  6 ++++--
>  drivers/net/i40e/i40e_ethdev.c             |  6 ++++--
>  drivers/net/nfp/nfpcore/nfp_cpp_pcie_ops.c | 10 ++++++----
>  test/test/test_cryptodev.c                 |  5 ++++-
>  4 files changed, 18 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/net/bnx2x/bnx2x.c b/drivers/net/bnx2x/bnx2x.c
> index 4c775c163..e418fd7d1 100644
> --- a/drivers/net/bnx2x/bnx2x.c
> +++ b/drivers/net/bnx2x/bnx2x.c
> @@ -11734,13 +11734,15 @@ static const char *get_bnx2x_flags(uint32_t flags)
>  
>  	for (i = 0; i < 5; i++)
>  		if (flags & (1 << i)) {
> -			strcat(flag_str, flag[i]);
> +			strlcat(flag_str, flag[i],
> +				BNX2X_INFO_STR_MAX - strlen(flag_str) - 1);
>  			flags ^= (1 << i);
>  		}
>  	if (flags) {
>  		static char unknown[BNX2X_INFO_STR_MAX];
>  		snprintf(unknown, 32, "Unknown flag mask %x", flags);
> -		strcat(flag_str, unknown);
> +		strlcat(flag_str, unknown,
> +			BNX2X_INFO_STR_MAX  - strlen(flag_str) - 1);
>  	}
This doesn't look right to me. "Strlcat" takes the saner approach of having
the length parameter being total length so subtraction etc. should not be
necessary. I think this should just be
"strlcat(flag_str, unknown, BNX2X_INFO_STR_MAX);"

  parent reply	other threads:[~2019-02-27  9:50 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-14  6:04 [dpdk-stable] [PATCH] drivers: fix to replace strcat with strncat Chaitanya Babu Talluri
2019-01-14 13:29 ` [dpdk-stable] [dpdk-dev] " Ferruh Yigit
2019-01-14 16:24   ` Stephen Hemminger
2019-01-17 16:44     ` Thomas Monjalon
2019-01-14 14:21 ` Bruce Richardson
2019-01-15  1:53   ` Thomas Monjalon
2019-01-18 15:11 ` [dpdk-stable] [PATCH v2] " Chaitanya Babu Talluri
2019-01-18 15:23 ` Chaitanya Babu Talluri
2019-01-21 10:43   ` [dpdk-stable] [dpdk-dev] " Parthasarathy, JananeeX M
2019-02-07 11:56     ` Ferruh Yigit
2019-02-07 12:08       ` Thomas Monjalon
2019-02-07 13:27       ` Bruce Richardson
2019-02-13 11:54         ` Ferruh Yigit
2019-02-27  6:02   ` [dpdk-stable] [PATCH v3] drivers: fix to replace strcat with strlcat Chaitanya Babu Talluri
2019-02-27  9:43     ` Ferruh Yigit
2019-02-27  9:49     ` Bruce Richardson [this message]
2019-02-27 10:26     ` Pattan, Reshma
2019-03-05 13:14     ` [dpdk-stable] [PATCH v4] drivers: fix possible overflow with strcat Chaitanya Babu Talluri
2019-03-06 18:14       ` Ferruh Yigit
2019-03-07 12:56       ` [dpdk-stable] [PATCH v5] " Chaitanya Babu Talluri
2019-03-13 18:39         ` [dpdk-stable] [dpdk-dev] " Ferruh Yigit
2019-03-14 13:34         ` [dpdk-stable] [PATCH v6] drivers/net: " Chaitanya Babu Talluri
2019-03-14 14:09           ` Pattan, Reshma
2019-03-18 12:41           ` [dpdk-stable] [PATCH v7] drivers/net: fix possible overflow using strlcat Chaitanya Babu Talluri
2019-03-20 20:18             ` [dpdk-stable] [dpdk-dev] " Ferruh Yigit
2019-03-22  7:51             ` [dpdk-stable] [PATCH v8] " Chaitanya Babu Talluri
2019-03-22  8:02               ` [dpdk-stable] [EXT] " Shahed Shaikh
2019-03-22 10:35                 ` Ferruh Yigit

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