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8832317f66
linux_dsm_epyc7002/arch/powerpc
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Vasant Hegde 8832317f66 powerpc/rtas: Validate rtas.entry before calling enter_rtas() 
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

Cc: stable@vger.kernel.org # v3.2+
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>
2015-10-22 11:03:25 +11:00
..
boot powerpc/boot: Specify ABI v2 when building an LE boot wrapper 2015-09-16 22:05:55 +10:00
configs powerpc/configs: Re-enable CONFIG_SCSI_DH 2015-09-29 20:34:03 +10:00
crypto crypto: powerpc/md5 - use md5 IV MD5_HX instead of their raw value 2015-05-18 12:20:20 +08:00
include powerpc: Revert "Use the POWER8 Micro Partition Prefetch Engine in KVM HV on POWER8" 2015-10-21 20:50:30 +11:00
kernel powerpc/rtas: Validate rtas.entry before calling enter_rtas() 2015-10-22 11:03:25 +11:00
kvm powerpc: Revert "Use the POWER8 Micro Partition Prefetch Engine in KVM HV on POWER8" 2015-10-21 20:50:30 +11:00
lib powerpc32: memset: only use dcbz once cache is enabled 2015-09-17 10:36:53 +10:00
math-emu powerpc: Correct emulated mtfsf instruction 2014-04-07 10:33:11 +10:00
mm powerpc: Fix checkstop in native_hpte_clear() with lockdep 2015-10-09 08:01:38 +11:00
net ppc: bpf: Add SKF_AD_CPU for ppc32 2015-02-20 15:19:43 -05:00
oprofile powerpc: Remove mtmsrd(), use existing mtmsr() 2015-07-13 15:47:28 +10:00
perf powerpc/perf: Change type of the bhrb_users variable 2015-07-27 14:31:44 +10:00
platforms powerpc/powernv: Handle irq_happened flag correctly in off-line loop 2015-10-21 20:52:49 +11:00
sysdev Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2015-09-18 08:11:42 -07:00
xmon powerpc/xmon: Drop the valid variable completely in dump_segments() 2015-08-12 15:05:47 +10:00
Kconfig kexec: split kexec_load syscall from kexec core code 2015-09-10 13:29:01 -07:00
Kconfig.debug powerpc: Make STRICT_MM_TYPECHECKS a config option 2015-05-11 19:53:59 +10:00
Makefile Merge branch 'kbuild' of git://git.kernel.org/pub/scm/linux/kernel/git/mmarek/kbuild 2015-09-08 14:12:19 -07:00
relocs_check.sh powerpc: Convert relocs_check to a shell script using grep 2015-03-23 14:47:39 +11:00