March 2015 - Darwin-kernel - lists.apple.com

Re: Setting up GDB
by Shantonu Sen 27 Mar '15

27 Mar '15

_______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

1 0

Setting up GDB
by Prokash Sinha 27 Mar '15

27 Mar '15

_______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

1 0

Re: Using NVRAM for boot-time kext settings?
by Phil Jordan 27 Mar '15

27 Mar '15

_______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

1 0

Re: Using NVRAM for boot-time kext settings?
by Regis Duchesne 26 Mar '15

26 Mar '15

Using the NVRAM for boot-time kext settings works (we use it here at VMware). I know of two ways to do that: 1) via boot-args, using PE_parse_boot_argn() That is fine if the driver only reads the variable. 2) via your own variables, using setProperty() and getProperty() on IORegistryEntry::fromPath("/options", gIODTPlane). The driver can read and write variables this way, but be aware that writes are actually committed to NVRAM only when OS X shuts down/reboots. The property name must be a string of the form [<UPPERCASED GUID>:]<NAME>. If <UPPERCASED GUID> is omitted, it defaults to the string 7C436110-AB2A-4BBB-A880-FE41995C9F82. But remember: the NVRAM space is very limited (to 64 KB, if I remember correctly)... Cheers, -- hpreg _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

1 0

Re: Using NVRAM for boot-time kext settings?
by Phil Jordan 26 Mar '15

26 Mar '15

_______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

1 0

Re: Using NVRAM for boot-time kext settings?
by Regis Duchesne 26 Mar '15

26 Mar '15

Another way than NVRAM (if you use an IOKit kext) is to use the OSDictionary that is passed to your class' init method, or to read the properties your class' node in the IORegistry. Both of these are populated from the kext's Info.plist. That is effectively your settings file, but you don't have to parse it yourself. However, this technique might become less useful now that kexts need to be signed: you can probably no longer simply modify the kext's Info.plist without breaking the signature. — hpreg > On Mar 25, 2015, at 7:43 PM, Phil Jordan <lists(a)philjordan.eu> wrote: > > Hi, > > The issue of boot-time kext configuration seems to come up a lot on this list. I'm fully aware of the fact that it's something of a faux pas to try and configure a kext by reading a settings file from disk in kernel mode. (and why) > > One of my clients has a security-related kext (kauth listener etc.) that we currently configure from a userspace daemon that gets started on boot via launchd. However, despite our best efforts, we can't get that daemon to reliably run before the first user apps are resumed, which has negative UX consequences if the hard-coded defaults in the kext don't happen to match the user's configuration. > > So we're now trying to come up with creative ideas for configuring the kext as early as possible during boot without resorting to reading config files in the kext. Is the NVRAM considered a reasonable place to store such settings? It's certainly easy enough to access the contents of NVRAM variables from the kext. > > If not, any other reasonable suggestions? > > Thanks, > Phil > > _______________________________________________ > Do not post admin requests to the list. They will be ignored. > Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) > Help/Unsubscribe/Update your Subscription: > https://lists.apple.com/mailman/options/darwin-kernel/hpreg%40vmware.com > > This email sent to hpreg(a)vmware.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

1 0

Using NVRAM for boot-time kext settings?
by Phil Jordan 25 Mar '15

25 Mar '15

_______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

1 0

Re: Kernel debug kits?
by Phil Jordan 16 Mar '15

16 Mar '15

_______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

1 0

Re: Using XPC for Interprocess Communication
by Arjun SM 13 Mar '15

13 Mar '15

_______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

1 0

Kernel debug kits?
by Kevin Brock 12 Mar '15

12 Mar '15

Does anyone know if Apple has said anything about the delay in getting the Kernel Debug Kit for 10.10.2 out? Kevin Brock apple(a)kevin.com _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists… This email sent to site_archiver(a)lists.apple.com

1 0