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linux/arch/powerpc
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Vasant Hegde 2958970785 powerpc/rtas: Validate rtas.entry before calling enter_rtas() 
commit 8832317f66 upstream.

Currently we do not validate rtas.entry before calling enter_rtas(). This
leads to a kernel oops when user space calls rtas system call on a powernv
platform (see below). This patch adds code to validate rtas.entry before
making enter_rtas() call.

  Oops: Exception in kernel mode, sig: 4 [#1]
  SMP NR_CPUS=1024 NUMA PowerNV
  task: c000000004294b80 ti: c0000007e1a78000 task.ti: c0000007e1a78000
  NIP: 0000000000000000 LR: 0000000000009c14 CTR: c000000000423140
  REGS: c0000007e1a7b920 TRAP: 0e40   Not tainted  (3.18.17-340.el7_1.pkvm3_1_0.2400.1.ppc64le)
  MSR: 1000000000081000 <HV,ME>  CR: 00000000  XER: 00000000
  CFAR: c000000000009c0c SOFTE: 0
  NIP [0000000000000000]           (null)
  LR [0000000000009c14] 0x9c14
  Call Trace:
  [c0000007e1a7bba0] [c00000000041a7f4] avc_has_perm_noaudit+0x54/0x110 (unreliable)
  [c0000007e1a7bd80] [c00000000002ddc0] ppc_rtas+0x150/0x2d0
  [c0000007e1a7be30] [c000000000009358] syscall_exit+0x0/0x98

Fixes: 55190f8878 ("powerpc: Add skeleton PowerNV platform")
Reported-by: NAGESWARA R. SASTRY <nasastry@in.ibm.com>
Signed-off-by: Vasant Hegde <hegdevasant@linux.vnet.ibm.com>
[mpe: Reword change log, trim oops, and add stable + fixes]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2015-11-09 14:33:33 -08:00
..
boot powerpc/boot: Specify ABI v2 when building an LE boot wrapper 2015-09-29 19:26:05 +02:00
configs powerpc: Remove the celleb support 2015-04-07 17:15:13 +10:00
crypto crypto: powerpc - move files to fix build error 2015-03-09 21:06:19 +11:00
include powerpc: Uncomment and make enable_kernel_vsx() routine available 2015-09-29 19:26:05 +02:00
kernel powerpc/rtas: Validate rtas.entry before calling enter_rtas() 2015-11-09 14:33:33 -08:00
kvm sched/preempt, powerpc, kvm: Use need_resched() instead of should_resched() 2015-10-27 09:52:01 +09:00
lib powerpc: Export __spin_yield 2015-04-21 15:21:28 +02:00
math-emu powerpc: Correct emulated mtfsf instruction 2014-04-07 10:33:11 +10:00
mm powerpc/mm: Recompute hash value after a failed update 2015-09-29 19:26:05 +02:00
net ppc: bpf: Add SKF_AD_CPU for ppc32 2015-02-20 15:19:43 -05:00
oprofile powerpc/oprofile: reduce mmap_sem hold for exe_file 2015-04-17 09:04:11 -04:00
perf powerpc/perf: Fix book3s kernel to userspace backtraces 2015-07-10 09:49:35 -07:00
platforms powerpc/MSI: Fix race condition in tearing down MSI interrupts 2015-10-22 14:43:24 -07:00
sysdev powerpc/MSI: Fix race condition in tearing down MSI interrupts 2015-10-22 14:43:24 -07:00
xmon powerpc updates for 3.20 2015-02-11 18:15:38 -08:00
Kconfig powerpc updates for 4.1 2015-04-16 13:53:32 -05:00
Kconfig.debug powerpc: Remove the celleb support 2015-04-07 17:15:13 +10:00
Makefile powerpc: Convert relocs_check to a shell script using grep 2015-03-23 14:47:39 +11:00
relocs_check.sh powerpc: Convert relocs_check to a shell script using grep 2015-03-23 14:47:39 +11:00