Kernel panic due to unsigned kernel module gsch

Solution In Progress - Updated -

Issue

  • Kernel ring buffer
BUG: unable to handle kernel paging request at ffffffffffffffdc
IP: [<ffffffff812837ec>] strncpy_from_user+0x5c/0x90
PGD 1a87067 PUD 1a88067 PMD 0 
Oops: 0002 [#1] SMP 
last sysfs file: /sys/devices/system/cpu/online
CPU 1 
Modules linked in: gsch(U) redirfs(U) vsock(U) vmci(U) acdc(P)(U) autofs4 nfs lockd fscache auth_rpcgss nfs_acl sunrpc ipv6 ppdev parport_pc parport vmware_balloon microcode vmxnet3 i2c_piix4 i2c_core shpchp sg ext4 mbcache jbd2 sd_mod crc_t10dif sr_mod cdrom vmw_pvscsi pata_acpi ata_generic ata_piix dm_mirror dm_region_hash dm_log dm_mod [last unloaded: speedstep_lib]

Pid: 5069, comm: ksh Tainted: P           ---------------    2.6.32-358.el6.x86_64 #1 VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform
RIP: 0010:[<ffffffff812837ec>]  [<ffffffff812837ec>] strncpy_from_user+0x5c/0x90
RSP: 0018:ffff880015235e98  EFLAGS: 00010206
RAX: 000000000000002f RBX: 0000000000001000 RCX: 0000000000001000
RDX: 0000000000000000 RSI: 00000000013a2979 RDI: ffffffffffffffdc
RBP: ffff880015235eb8 R08: 000000000000000f R09: 00000000013a25c4
R10: 0000000000000008 R11: 0000000000000246 R12: 00000000013a2978
R13: 0000000000001000 R14: fffffffffffffff6 R15: 00000000013a26c8
FS:  00007f4ccbce3700(0000) GS:ffff88002f620000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: ffffffffffffffdc CR3: 00000000151e0000 CR4: 00000000000007e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process ksh (pid: 5069, threadinfo ffff880015234000, task ffff88001525c080)
Stack:
 00000000013a2978 ffffffffffffffdc 00000000013a2978 fffffffffffffff4
<d> ffff880015235ee8 ffffffffa031e74c 0000000000000040 ffff88001525c6f8
<d> 00000000013a2978 00000000000013cd ffff880015235f28 ffffffffa03225fb
Call Trace:
 [<ffffffffa031e74c>] gsch_getname+0x4c/0x90 [gsch]
 [<ffffffffa03225fb>] gsch_sys_execve_handler_fn+0xab/0x1b0 [gsch]
 [<ffffffffa031f432>] gsch_stub_execve_hook_fn+0x12/0x1b [gsch]
 [<ffffffff8100b072>] ? system_call_fastpath+0x16/0x1b
Code: c9 48 39 82 48 e0 ff ff 48 83 d9 00 48 85 c9 49 89 f4 75 38 e8 96 a8 28 00 48 89 df 4c 89 e6 4c 89 eb 4c 89 e9 48 85 c9 74 0e ac <aa> 84 c0 74 05 48 ff c9 75 f5 48 29 cb 48 89 da 48 89 d0 48 8b 
RIP  [<ffffffff812837ec>] strncpy_from_user+0x5c/0x90
 RSP <ffff880015235e98>
CR2: ffffffffffffffdc

Environment

  • Red Hat Enterprise Linux 6.4
  • gsch third party kernel module

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