2015-03-27 18:42 GMT+02:00 Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>:
> On Fri, 27 Mar 2015, Daniel Vetter <daniel@xxxxxxxx> wrote:
>> On Fri, Mar 27, 2015 at 09:10:02AM +0100, Daniel Vetter wrote:
>>> It's completely unused and Tommi noticed that the #define is borked
>>> since forever. I've done a git search in userspace and only found
>>> broken definitions and no users anywhere.
>>>
>>> Cc: Tommi Rantala <tt.rantala@xxxxxxxxx>
>>> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxxx>
>>
>> Hm Tommi discovered oopses in there, so I guess this should be
>> cherry-picked to -fixes+cc: stable too? Jani?
>
> My OCD really wants to know why this blows up. The get/set functions
> look so similar that it feels like the set should fail just the same...
> Tommi, did you try just the set part of your test program [1]?
Yes, both the set and get ioctls crash:
[ 20.868660] BUG: unable to handle kernel NULL pointer dereference
at (null)
[ 20.876527] IP: [< (null)>] (null)
[ 20.881573] PGD c4f7d067 PUD c2a6b067 PMD 0
[ 20.885866] Oops: 0010 [#1] SMP KASAN
[ 20.889549] CPU: 1 PID: 2207 Comm: main Not tainted 4.0.0-rc5+ #89
[ 20.902805] task: ffff8800c4fad380 ti: ffff8800c2b98000 task.ti:
ffff8800c2b98000
[ 20.910257] RIP: 0010:[<0000000000000000>] [< (null)>]
(null)
[ 20.917722] RSP: 0018:ffff8800c2b9fd30 EFLAGS: 00010246
[ 20.923012] RAX: ffffed002e87c961 RBX: ffff88017463d000 RCX: 0000000000000006
[ 20.930116] RDX: dffffc0000000000 RSI: ffff8800c2b9fdd8 RDI: ffff8801743e4800
[ 20.937214] RBP: ffff8800c2b9fd68 R08: 0000000000000000 R09: 0000000000000000
[ 20.944318] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8800c2b9fdd8
[ 20.951416] R13: ffff8801743e48d8 R14: 00000000fffffffe R15: ffff8801743e4800
[ 20.958524] FS: 00007f7139b3a700(0000) GS:ffff880175e00000(0000)
knlGS:0000000000000000
[ 20.966575] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 20.972300] CR2: 0000000000000000 CR3: 00000000c2a67000 CR4: 00000000000406e0
[ 20.979407] Stack:
[ 20.981414] ffffffff81b4a11d ffff8800c2b9fd68 ffff88017463d000
ffff8800c4c50c00
[ 20.988838] 0000000000000014 fffffffffffffff2 ffffffff8271c3e0
ffff8800c2b9fe88
[ 20.996238] ffffffff818acbbc ffff8800c2b9fe18 ffffffff8165d7c2
ffffffff8165d660
[ 21.003658] Call Trace:
[ 21.006110] [<ffffffff81b4a11d>] ? intel_sprite_set_colorkey+0xad/0xf0
[ 21.012695] [<ffffffff818acbbc>] drm_ioctl+0x27c/0x890
[ 21.017904] [<ffffffff8165d7c2>] ? avc_has_perm+0x182/0x320
[ 21.023544] [<ffffffff8165d660>] ? avc_has_perm+0x20/0x320
[ 21.029098] [<ffffffff81b4a070>] ? intel_pre_disable_primary+0x90/0x90
[ 21.035690] [<ffffffff8165ffac>] ? inode_has_perm.isra.28+0x7c/0xa0
[ 21.042023] [<ffffffff812f8caf>] do_vfs_ioctl+0x3cf/0x720
[ 21.047488] [<ffffffff81660caa>] ? selinux_file_ioctl+0x6a/0x130
[ 21.053558] [<ffffffff812f9081>] SyS_ioctl+0x81/0xa0
[ 21.058595] [<ffffffff825e08b2>] system_call_fastpath+0x12/0x17
[ 21.064580] Code: Bad RIP value.
[ 21.067916] RIP [< (null)>] (null)
[ 21.073048] RSP <ffff8800c2b9fd30>
[ 21.076524] CR2: 0000000000000000
[ 21.079863] ---[ end trace 161ba639126f6a45 ]---
[ 274.286068] BUG: unable to handle kernel NULL pointer dereference
at (null)
[ 274.295149] IP: [< (null)>] (null)
[ 274.300242] PGD 171999067 PUD 171b93067 PMD 0
[ 274.304744] Oops: 0010 [#1] SMP KASAN
[ 274.308460] CPU: 0 PID: 2202 Comm: main Not tainted 4.0.0-rc5+ #89
[ 274.321856] task: ffff8801726914e0 ti: ffff880172928000 task.ti:
ffff880172928000
[ 274.329383] RIP: 0010:[<0000000000000000>] [< (null)>]
(null)
[ 274.336924] RSP: 0018:ffff88017292fd30 EFLAGS: 00010246
[ 274.342267] RAX: ffffed002e7bc362 RBX: ffff88017442f000 RCX: 0000000000000007
[ 274.349446] RDX: 0000000000000000 RSI: ffff88017292fdd8 RDI: ffff880173de1800
[ 274.356624] RBP: ffff88017292fd68 R08: 0000000000000000 R09: 0000000000000000
[ 274.363803] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[ 274.370979] R13: ffff880173de18d8 R14: ffff88017292fdd8 R15: ffff880173de1800
[ 274.378157] FS: 00007f48d6b16700(0000) GS:ffff880175c00000(0000)
knlGS:0000000000000000
[ 274.386297] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 274.392078] CR2: 0000000000000000 CR3: 000000017188d000 CR4: 00000000000406f0
[ 274.399257] Stack:
[ 274.401280] ffffffff81b4a1f7 ffff88017292fd68 ffff88017442f000
ffff880172cc7c00
[ 274.408761] 0000000000000014 fffffffffffffff2 ffffffff8271c3c0
ffff88017292fe88
[ 274.416244] ffffffff818acbbc ffff88017292fe18 ffffffff8165d7c2
ffffffff8165d660
[ 274.423727] Call Trace:
[ 274.426192] [<ffffffff81b4a1f7>] ? intel_sprite_get_colorkey+0x97/0xc0
[ 274.432849] [<ffffffff818acbbc>] drm_ioctl+0x27c/0x890
[ 274.438107] [<ffffffff8165d7c2>] ? avc_has_perm+0x182/0x320
[ 274.443800] [<ffffffff8165d660>] ? avc_has_perm+0x20/0x320
[ 274.449407] [<ffffffff81b4a160>] ? intel_sprite_set_colorkey+0xf0/0xf0
[ 274.456065] [<ffffffff8165ffac>] ? inode_has_perm.isra.28+0x7c/0xa0
[ 274.462462] [<ffffffff812f8caf>] do_vfs_ioctl+0x3cf/0x720
[ 274.467984] [<ffffffff81660caa>] ? selinux_file_ioctl+0x6a/0x130
[ 274.474115] [<ffffffff812f9081>] SyS_ioctl+0x81/0xa0
[ 274.479199] [<ffffffff825e08b2>] system_call_fastpath+0x12/0x17
[ 274.485240] Code: Bad RIP value.
[ 274.488597] RIP [< (null)>] (null)
[ 274.493776] RSP <ffff88017292fd30>
[ 274.497283] CR2: 0000000000000000
I debugged this a bit, and found that in intel_sprite_set_colorkey(),
the "intel_plane->update_colorkey" function pointer is NULL, and in
intel_sprite_get_colorkey(), the "intel_plane->get_colorkey" pointer
is NULL. Hence the crash.
If I got it right, the pointers are not set for the "primary" and
"cursor" planes, as initialized in intel_primary_plane_create() and
intel_cursor_plane_create().
Tommi
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