Date: Thu, 27 Jun 2013 21:30:01 GMT From: John Baldwin <jhb@freebsd.org> To: freebsd-net@FreeBSD.org Subject: Re: kern/179999: [ofed] [patch] Bug assigning HCA from IB to ETH Message-ID: <201306272130.r5RLU1x9016996@freefall.freebsd.org>
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The following reply was made to PR kern/179999; it has been noted by GNATS. From: John Baldwin <jhb@freebsd.org> To: bug-followup@freebsd.org, shahark@mellanox.com Cc: Subject: Re: kern/179999: [ofed] [patch] Bug assigning HCA from IB to ETH Date: Thu, 27 Jun 2013 14:10:42 -0400 Thanks, I think the sysfs fix has a few issues though (it writes to buf[] even if the copyin() fails, and it doesn't enforce a bounds check). It does seem that this should probably be using sysctl_handle_string() instead of doing it by hand, but for now I've just adjusted your patch. Can you please test this version? Index: ofed/drivers/net/mlx4/main.c =================================================================== --- ofed/drivers/net/mlx4/main.c (revision 252306) +++ ofed/drivers/net/mlx4/main.c (working copy) @@ -479,11 +479,11 @@ int i; int err = 0; - if (!strcmp(buf, "ib\n")) + if (!strcmp(buf, "ib")) info->tmp_type = MLX4_PORT_TYPE_IB; - else if (!strcmp(buf, "eth\n")) + else if (!strcmp(buf, "eth")) info->tmp_type = MLX4_PORT_TYPE_ETH; - else if (!strcmp(buf, "auto\n")) + else if (!strcmp(buf, "auto")) info->tmp_type = MLX4_PORT_TYPE_AUTO; else { mlx4_err(mdev, "%s is not supported port type\n", buf); Index: ofed/include/linux/sysfs.h =================================================================== --- ofed/include/linux/sysfs.h (revision 252306) +++ ofed/include/linux/sysfs.h (working copy) @@ -104,10 +104,15 @@ error = SYSCTL_OUT(req, buf, len); if (error || !req->newptr || ops->store == NULL) goto out; - error = SYSCTL_IN(req, buf, PAGE_SIZE); + len = req->newlen - req->newidx; + if (len >= PAGE_SIZE) + error = EINVAL; + else + error = SYSCTL_IN(req, buf, len); if (error) goto out; - len = ops->store(kobj, attr, buf, req->newlen); + ((char *)buf)[len] = '\0'; + len = ops->store(kobj, attr, buf, len); if (len < 0) error = -len; out: -- John Baldwin
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