March 2018 - Darwin-kernel - lists.apple.com

KDK for 17E199 ??
by Prokash Sinha 30 Mar '18

30 Mar '18

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Folks, Any news on availabitlity of this KDK ? Thx, Pro _______________________________________________ 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

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Re: Kext OSDynamicCast triggered panic during OSObject::free
by Michael Crawford 28 Mar '18

28 Mar '18

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=soggywizards-com.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=PauCEuRRNx0Ojr6/5EF0qLbi+NQVcV/yLMy/7YSRqY4=; b=ebUgflC3w+JisHSjQR+ooZP/wQZPFxwTipXQ6q1BHuKjAu/j0kzt0BwsZRLfOZHRVc 3DXcn5PG8NdXF7D6TlOhVZOzaT0kkhZQ7JGbhzp7nm2OQB3ArCtmF6QzHbTFmuSv7DI0 TIAFOTg/DqClrA216H6uwpbh6BthFb6GaJGVmtwfTCpwyQqddQJFNOr1grB/1I2W/MKi 2WocKXAuboILx4b0ikjCtidHnVC4DWbJ4fwIiccv6rwfp4dDl+vxT0OjJRk6v4Bl6/UF x1XruhRk2nUAX3PsYo46ryG1yHDphohzcvjlvcgLxyc4kLUQNmEXTSwkDnMukKnTDYSw ypqQ== The memory might already be corrupted by the time you call OSADynamicCast. Is there a heap checker for the kernel? _______________________________________________ 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

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Kext OSDynamicCast triggered panic during OSObject::free
by Irad K 27 Mar '18

27 Mar '18

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=1bHXq61K806Ty/wDcomlKgwyBvr3z8RtMQRGjPXIhPg=; b=EEJDYRgvONk2v6F1zhLWYBkDWgM55898hnh7Z3U5FnCmiBcGlhHn9Iof8jmJthjKtr 3yUjxbHI5UGhbXzLKqhEtk3JwaYnpmy5MIxbu5z4fvduZJwIvB7hggj1KqRmgBg0q+ro cNIip1BjVFICoCFWu8OyiL3jGpITWJkmvHLJUCrQWzv2vvT62vrVLDHYMhsz5TMPBKrx b4W1Fcu0B5GL15Xvncns+gV6y0fMHmen/FbfXUA42q0B/xSDT1YEkEsHjrQkcEPd04Qh yBJGAtCoJXyRXF4kRsqnBZyoyCDaRZcKFpM/syDj/kY4DPctqQab1GIjTYplzhpP7vf8 4g4Q== I'm working on IOKit driver that derives from `IOService` base class, and its raw pointer is delivered to some event callback function from `kauth` framework that may be called very frequently. In order to extract this instance out of the pointer I uses the safe method `OSDynamicCast`, and I make sure that during driver teardown, I disable the `kauth` calls and flush all existing calls BEFORE freeing the driver. However, sometimes I still get kernel panic on the `OSDynamicCast` : frame #0: [inlined] OSMetaClass::checkMetaCast(check=0xffffff802b28d3f0) frame #1: [inlined] OSMetaClassBase::metaCast(OSMetaClass const*) const frame #2: kernel`OSMetaClassBase::safeMetaCast When I disabled and flushed the `kauth` calls before the `OSObject::free` on the `IOService::stop` callback, the problem hasn't repeats itself (at least after dozens of tries). Perhaps anyone have an idea if there's any memory being freed during the period between `::stop` and `::free` that trigger this panic ? Here's a small code that emphasis my design when It trigger panic. kauth_callback(kauth_cred_t credential, void *idata, /* This is the RAW pointer for my IOService based instance */ kauth_action_t action, uintptr_t arg0, uintptr_t arg1, uintptr_t arg2, uintptr_t arg3) { ... // taking shared_lock with mutex auto my_inst = OSDynamicCast(com_my_driver, reinterpret_cast<OSObject *>(idata)); ... } void com_my_driver::free(IOService *provider) { kauth_unlisten_scope(my_listener_); // taking unique lock with mutex to make sure no outstanding kauth calls. super::free(provider); //calling OSObject free } And if I move the logic from `::free` to `::stop` it works : void com_my_driver::stop(IOService *provider) { kauth_unlisten_scope(my_listener_); // taking unique lock with mutex to make sure no outstanding kauth calls. super::stop(provider); // Calling IOService::stop() } Thanks, Irad _______________________________________________ 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

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Re: Current two-machine debugging
by Quinn "The Eskimo!" 22 Mar '18

22 Mar '18

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com On 21 Mar 2018, at 19:28, Michael Crawford <mike(a)soggywizards.com> wrote: > I don't recall what that additional item is … The go-to place for this sort of setup information is the read me inside the Kernel Debug Kit for the macOS you’re targeting. Share and Enjoy -- Quinn "The Eskimo!" <http://www.apple.com/developer/> Apple Developer Relations, Developer Technical Support, Core OS/Hardware _______________________________________________ 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

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Re: Current two-machine debugging
by apple＠kevin.com 21 Mar '18

21 Mar '18

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hm… Haven’t tried TB Firewire, just TB Ethernet. I’ll see what I can find on that one. Kevin > On Mar 21, 2018, at 12:28, Michael Crawford <mike(a)soggywizards.com> wrote: > > Thunderbolt Firewire needs an additional item in boot-args that is not > needed when the Macs have built-in firewire. > > I don't recall what that additional item is but this hint is likely > all you need for Google to answer your prayers with insight. > > On Wed, Mar 21, 2018 at 11:07 AM, <apple(a)kevin.com> wrote: >> Hi! I haven’t had to do any modifications to some kernel level pieces that >> I worked on for a few years—up until a few days ago. >> >> I started trying to get two-machine debugging going again, but something’s >> going wrong… It’s probably something really simple that I’m missing. >> >> I’ve got two macOS 10.13.3 system connected with Thunderbolt Ethernet. >> >> - Manually assigned IP addresses to the respective interfaces, set the debug >> to 0x144, set the right kdp_match_name >> - Triggered a NMI >> - Got a connection with lldb, was able to look at variables etc., but when I >> ‘continue’ the remote machine doesn’t continue. >> >> I thought maybe it was an issue with interrupting a running kernel, so I set >> debug to 0x141. Target system pauses during boot for a connection, but when >> I try to connect the debugger the target system panics, goes back to waiting >> for debugger. >> >> I’ve tried it with SIP enabled and disabled, and with both the release and >> development kernels. >> >> Anyone have any ideas what I’m missing here? >> >> Kevin >> >> _______________________________________________ >> 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/mike%40soggywizards.c… >> >> This email sent to mike(a)soggywizards.com > > > > -- > Mike Crawford > Portland Custom Software Development > mike(a)soggywizards.com > http://soggywizards.com > > One Must Not Trifle With Wizards For It Makes Us Soggy And Hard To Light _______________________________________________ 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

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Re: Current two-machine debugging
by Michael Crawford 21 Mar '18

21 Mar '18

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=soggywizards-com.20150623.gappssmtp.com; s=20150623; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc:content-transfer-encoding; bh=mg0eoYlW2AlmV9n9oLfMfkDN9i3H8EkRcjgT0AS/SMs=; b=qqvsvcxnsvWRyMoaWzcYictxx5WCsdT9GnzkANccmrgUpgLFBfTBadmEZBY0Ak4YFA R8HcWUWT1w0v7DOqUUY3krahmTfZy+b6KqVkHmb9K+gdbCFeKMM84/JpeH36ji1Uc8yF gOq+DJWEd34paYG3ku70rhcDJlMy5Sp5NPmpKWqln2ow6XyYa+OE9ehl2ObxIncUbB19 JUgzUpf9JkNA7qANzhy6Ffr3HlZ1WN/KxswQbQMqzfQ2XchD8e3X+MAW1/zhFFW+Ee0Z n8cON2Ax4Ckj2Mfn9hZsToLqmzF2lrlGMBWKfWwCLka6OV2EvF0O6Cjjr1aB8AqLUSjO DgHw== Thunderbolt Firewire needs an additional item in boot-args that is not needed when the Macs have built-in firewire. I don't recall what that additional item is but this hint is likely all you need for Google to answer your prayers with insight. On Wed, Mar 21, 2018 at 11:07 AM, <apple(a)kevin.com> wrote: > Hi! I haven’t had to do any modifications to some kernel level pieces that I > worked on for a few years—up until a few days ago. > > I started trying to get two-machine debugging going again, but something’s > going wrong… It’s probably something really simple that I’m missing. > > I’ve got two macOS 10.13.3 system connected with Thunderbolt Ethernet. > > - Manually assigned IP addresses to the respective interfaces, set the debug > to 0x144, set the right kdp_match_name > - Triggered a NMI > - Got a connection with lldb, was able to look at variables etc., but when I > ‘continue’ the remote machine doesn’t continue. > > I thought maybe it was an issue with interrupting a running kernel, so I set > debug to 0x141. Target system pauses during boot for a connection, but when > I try to connect the debugger the target system panics, goes back to waiting > for debugger. > > I’ve tried it with SIP enabled and disabled, and with both the release and > development kernels. > > Anyone have any ideas what I’m missing here? > > Kevin > > _______________________________________________ > 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/mike%40soggywizards.c… > > This email sent to mike(a)soggywizards.com -- Mike Crawford Portland Custom Software Development mike(a)soggywizards.com http://soggywizards.com One Must Not Trifle With Wizards For It Makes Us Soggy And Hard To Light _______________________________________________ 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

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Current two-machine debugging
by apple＠kevin.com 21 Mar '18

21 Mar '18

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Hi! I haven’t had to do any modifications to some kernel level pieces that I worked on for a few years—up until a few days ago. I started trying to get two-machine debugging going again, but something’s going wrong… It’s probably something really simple that I’m missing. I’ve got two macOS 10.13.3 system connected with Thunderbolt Ethernet. - Manually assigned IP addresses to the respective interfaces, set the debug to 0x144, set the right kdp_match_name - Triggered a NMI - Got a connection with lldb, was able to look at variables etc., but when I ‘continue’ the remote machine doesn’t continue. I thought maybe it was an issue with interrupting a running kernel, so I set debug to 0x141. Target system pauses during boot for a connection, but when I try to connect the debugger the target system panics, goes back to waiting for debugger. I’ve tried it with SIP enabled and disabled, and with both the release and development kernels. Anyone have any ideas what I’m missing here? Kevin _______________________________________________ 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

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KDK for Sierra 10.12.6 Build 16G1212
by Yahav Peri 14 Mar '18

14 Mar '18

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sec-do.20150623.gappssmtp.com; s=20150623; h=mime-version:from:date:message-id:subject:to; bh=ARV0MslXXH3g+VyXRG/eqsUA5OrTNcuBcBGxsVU0jrI=; b=czrU+ue4xWSWAs2C7FCg5cV5pT0IpnSK9ODa3lmOsLIOvJJDq+HctCVFy3Cz9/fRf6 oby/KIzTPfmdTWXTNkAcO6WsnUT5sPagkcSkU2B2+zZDgw+g4nozaoB4q8n/qt6ZVVfe +0ALZztMx2uEFu63suSxzTQ7nbRaEHYQaHDgYnTcPxEsjMrAB3I+dLXoYv+0wBWSxDjj WRpWO3RLw6hxKwSNHwS142w6a6uujCdh5oAwLw88gmhpxfDEZ+aRcchqVgmFpO9MWGQW ljw29cHy7dk9lMEj7AWruizCAWUDbeJ6nIBr2ZRlWpwviTZYZXj+LJvEqsdhsZbVNwdM 1weA== Hello, I've searched for the KDK for Sierra version 10.12.6 (16G1212) and didn't find it. Does someone know where I can find it? [I found only those corresponding to: 10.12.6(16G18a), 10.12.6(16G23a), 10.12.6(16G29) and 10.12.6(16G1036) on developer.apple.com .] Thanks, Yahav _______________________________________________ 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

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disk_conditioner_delay doesn't check whether vp is NULL
by Quinten Johnson 06 Mar '18

06 Mar '18

site_archiver(a)lists.apple.com Delivered-To: darwin-kernel(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=outlook.com; s=selector1; h=From:Date:Subject:Message-ID:Content-Type:MIME-Version; bh=izRsEULVCwauMw3NET2wiA5peS5tNt+UGTmy5BP1VB8=; b=df3il4mgCylbb4i5/kSjWIfqiXqapKEZvuoku1wyPLoZYDLi68ZnfilLc4lkkIwD1JlyMXzyG7kkag6ADWrbmANm2H8Xosj0nKZC7pThKR8G16gEtzpwJKKe02JMWmJ0/lfy0FRrTOcBf2k5ns3h+qasMP62cdJxB8AGuIiNIEHL5ovwal+7N4uXS0xUrsJzrMeJtaz/6vq/zRz3WqsHbrl/scMbRloVzRcVNiQrhqlOwRTPcr0HeU7MviH3WBR8rMGfsgLfLO/a/0hZVRqPVKts42dmiUzCs+BpDcL4bzKCK9F9Kd2PStKLAeHMIYSKviHf7ZD0bfdeu0N+JDT1cA== Spamdiagnosticmetadata: NSPM Spamdiagnosticoutput: 1:99 Thread-index: AdO1ZqdJk6tI6dyNTrKzrY1zKYc7bQ== Thread-topic: disk_conditioner_delay doesn't check whether vp is NULL in bsd/vfs/vfs_disk_conditioner.c, disk_conditioner_delay() isn't guarding against NULL bp->b_vp. in bsd/vfs/vfs_bio.c: void buf_biodone(buf_t bp) { ... if (bp->b_vp && bp->b_vp->v_mount) { mp = bp->b_vp->v_mount; } else { mp = NULL; } ... disk_conditioner_delay(bp, 1, bp->b_bcount, read_elapsed_usec); in bsd/vfs/vfs_disk_conditioner.c: void disk_conditioner_delay(buf_t bp, int extents, int total_size, uint64_t already_elapsed_usec) { ... mp = buf_vnode(bp)->v_mount; if (!mp) { return; } ... } So a NULL check is needed similar to the one in buf_biodone(). Quinten Johnson quinten.johnson(a)outlook.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

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