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| author | Sasha Levin <sasha.levin@oracle.com> | 2014-04-04 14:38:24 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-04-07 12:48:17 -0700 |
| commit | b0e2796029d26f4541e9cb1e9f54e1a7020618c6 (patch) | |
| tree | 2033dbcb7fccd34faf30678927eedb8d49a548b7 /drivers/staging | |
| parent | 9c01e83ce71158e48148c0aba2d8b78d89e28b97 (diff) | |
| download | linux-b0e2796029d26f4541e9cb1e9f54e1a7020618c6.tar.gz | |
Staging: unisys: verify that a control channel exists
The code didn't verify that a control channel exists before trying to use it. It caused NULL ptr derefs which were easy to trigger by an unpriviliged user simply by reading the proc file, causing: [ 68.161404] BUG: unable to handle kernel NULL pointer dereference at (null) [ 68.162442] IP: visorchannel_read (drivers/staging/unisys/visorchannel/visorchannel_funcs.c:225) [ 68.163165] PGD 5ca21067 PUD 5ca20067 PMD 0 [ 68.163712] Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC [ 68.164390] Dumping ftrace buffer: [ 68.164793] (ftrace buffer empty) [ 68.165220] Modules linked in: [ 68.165601] CPU: 0 PID: 7915 Comm: cat Tainted: G W 3.14.0-next-20140403-sasha-00012-gef5fa7d-dirty #373 [ 68.166821] task: ffff88006e8c3000 ti: ffff88005ca30000 task.ti: ffff88005ca30000 [ 68.167689] RIP: visorchannel_read (drivers/staging/unisys/visorchannel/visorchannel_funcs.c:225) [ 68.168683] RSP: 0018:ffff88005ca31e58 EFLAGS: 00010282 [ 68.169302] RAX: ffff88005ca10000 RBX: ffff88005ca31e97 RCX: 0000000000000001 [ 68.170019] RDX: ffff88005ca31e97 RSI: 0000000000000bd6 RDI: 0000000000000000 [ 68.170019] RBP: ffff88005ca31e78 R08: 0000000000000000 R09: 0000000000000000 [ 68.170019] R10: ffff880000000000 R11: 0000000000000001 R12: 0000000000000001 [ 68.170019] R13: 0000000000000bd6 R14: 0000000000000000 R15: 0000000000008000 [ 68.170019] FS: 00007f0e8c041700(0000) GS:ffff88007be00000(0000) knlGS:0000000000000000 [ 68.170019] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 68.170019] CR2: 0000000000000000 CR3: 000000006efe9000 CR4: 00000000000006b0 [ 68.170019] Stack: [ 68.170019] ffff88005ca31f50 ffff88005ca10000 000000000060e000 ffff88005ca31f50 [ 68.170019] ffff88005ca31ec8 ffffffff83e6f983 ffff8800780db810 0000000000008000 [ 68.170019] ffff88005ca31ec8 ffff88006da5f908 ffff8800780db800 000000000060e000 [ 68.170019] Call Trace: [ 68.170019] proc_read_toolaction (drivers/staging/unisys/visorchipset/visorchipset_main.c:2541) [ 68.170019] proc_reg_read (fs/proc/inode.c:211) [ 68.170019] vfs_read (fs/read_write.c:408) [ 68.170019] SyS_read (fs/read_write.c:519 fs/read_write.c:511) [ 68.170019] tracesys (arch/x86/kernel/entry_64.S:749) [ 68.170019] Code: 00 00 66 66 66 66 90 55 48 89 e5 48 83 ec 20 48 89 5d e0 48 89 d3 4c 89 65 e8 49 89 cc 4c 89 6d f0 49 89 f5 4c 89 75 f8 49 89 fe <48> 8b 3f e8 4f f9 ff ff 85 c0 0f 88 97 00 00 00 4d 85 ed 0f 85 [ 68.170019] RIP visorchannel_read (drivers/staging/unisys/visorchannel/visorchannel_funcs.c:225) [ 68.170019] RSP <ffff88005ca31e58> [ 68.170019] CR2: 0000000000000000 Signed-off-by: Sasha Levin <sasha.levin@oracle.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/staging')
| -rw-r--r-- | drivers/staging/unisys/visorchipset/visorchipset_main.c | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/staging/unisys/visorchipset/visorchipset_main.c b/drivers/staging/unisys/visorchipset/visorchipset_main.c index 8252ca14695d..257c6e59b460 100644 --- a/drivers/staging/unisys/visorchipset/visorchipset_main.c +++ b/drivers/staging/unisys/visorchipset/visorchipset_main.c @@ -2414,6 +2414,9 @@ proc_read_installer(struct file *file, char __user *buf, char *vbuf; loff_t pos = *offset; + if (!ControlVm_channel) + return -ENODEV; + if (pos < 0) return -EINVAL; @@ -2463,6 +2466,9 @@ proc_write_installer(struct file *file, U16 remainingSteps; U32 error, textId; + if (!ControlVm_channel) + return -ENODEV; + /* Check to make sure there is no buffer overflow */ if (count > (sizeof(buf) - 1)) return -EINVAL; @@ -2524,6 +2530,9 @@ proc_read_toolaction(struct file *file, char __user *buf, char *vbuf; loff_t pos = *offset; + if (!ControlVm_channel) + return -ENODEV; + if (pos < 0) return -EINVAL; @@ -2562,6 +2571,9 @@ proc_write_toolaction(struct file *file, char buf[3]; U8 toolAction; + if (!ControlVm_channel) + return -ENODEV; + /* Check to make sure there is no buffer overflow */ if (count > (sizeof(buf) - 1)) return -EINVAL; @@ -2601,6 +2613,9 @@ proc_read_bootToTool(struct file *file, char __user *buf, char *vbuf; loff_t pos = *offset; + if (!ControlVm_channel) + return -ENODEV; + if (pos < 0) return -EINVAL; @@ -2639,6 +2654,9 @@ proc_write_bootToTool(struct file *file, int inputVal; ULTRA_EFI_SPAR_INDICATION efiSparIndication; + if (!ControlVm_channel) + return -ENODEV; + /* Check to make sure there is no buffer overflow */ if (count > (sizeof(buf) - 1)) return -EINVAL; |