AuxXxilium/linux_dsm_epyc7002
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f39356261c
linux_dsm_epyc7002/arch/powerpc
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Rick Lindsley f39356261c powerpc/book3s/64: check for NULL pointer in pgd_alloc() 
When the memset code was added to pgd_alloc(), it failed to consider
that kmem_cache_alloc() can return NULL. It's uncommon, but not
impossible under heavy memory contention. Example oops:

  Unable to handle kernel paging request for data at address 0x00000000
  Faulting instruction address: 0xc0000000000a4000
  Oops: Kernel access of bad area, sig: 11 [#1]
  LE SMP NR_CPUS=2048 NUMA pSeries
  CPU: 70 PID: 48471 Comm: entrypoint.sh Kdump: loaded Not tainted 4.14.0-115.6.1.el7a.ppc64le #1
  task: c000000334a00000 task.stack: c000000331c00000
  NIP:  c0000000000a4000 LR: c00000000012f43c CTR: 0000000000000020
  REGS: c000000331c039c0 TRAP: 0300   Not tainted  (4.14.0-115.6.1.el7a.ppc64le)
  MSR:  800000010280b033 <SF,VEC,VSX,EE,FP,ME,IR,DR,RI,LE,TM[E]>  CR: 44022840  XER: 20040000
  CFAR: c000000000008874 DAR: 0000000000000000 DSISR: 42000000 SOFTE: 1
  ...
  NIP [c0000000000a4000] memset+0x68/0x104
  LR [c00000000012f43c] mm_init+0x27c/0x2f0
  Call Trace:
    mm_init+0x260/0x2f0 (unreliable)
    copy_mm+0x11c/0x638
    copy_process.isra.28.part.29+0x6fc/0x1080
    _do_fork+0xdc/0x4c0
    ppc_clone+0x8/0xc
  Instruction dump:
  409e000c b0860000 38c60002 409d000c 90860000 38c60004 78a0d183 78a506a0
  7c0903a6 41820034 60000000 60420000 <f8860000> f8860008 f8860010 f8860018

Fixes: fc5c2f4a55 ("powerpc/mm/hash64: Zero PGD pages on allocation")
Cc: stable@vger.kernel.org # v4.16+
Signed-off-by: Rick Lindsley <ricklind@vnet.linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2019-05-07 13:24:31 +10:00
..
boot powerpc/boot: Fix missing check of lseek() return value 2019-05-03 02:54:57 +10:00
configs powerpc/configs: Add (back) MLX5 ethernet support to skiroot_defconfig 2019-05-03 02:54:58 +10:00
crypto powerpc/crypto: Use cheaper random numbers for crc-vpmsum self-test 2019-04-20 22:03:11 +10:00
include powerpc/book3s/64: check for NULL pointer in pgd_alloc() 2019-05-07 13:24:31 +10:00
kernel powerpc/hmi: Fix kernel hang when TB is in error state. 2019-05-03 02:54:57 +10:00
kvm Merge branch 'topic/ppc-kvm' into next 2019-04-30 22:52:03 +10:00
lib powerpc: disable KASAN instrumentation on early/critical files. 2019-05-03 01:20:26 +10:00
math-emu powerpc: math-emu: remove unneeded header search paths 2019-01-14 20:39:27 +11:00
mm powerpc/mm: Fix hugetlb page initialization 2019-05-06 22:37:39 +10:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2019-03-16 12:20:08 -07:00
oprofile Remove 'type' argument from access_ok() function 2019-01-03 18:57:57 -08:00
perf powerpc/perf: Trace imc PMU functions 2019-05-03 02:55:00 +10:00
platforms powerpc/perf: Trace imc events detection and cpuhotplug 2019-05-03 02:55:00 +10:00
purgatory powerpc: disable KASAN instrumentation on early/critical files. 2019-05-03 01:20:26 +10:00
sysdev powerpc/xive: add OPAL extensions for the XIVE native exploitation support 2019-04-11 15:31:41 +10:00
tools powerpc/tools/checkpatch: Ignore DT_SPLIT_BINDING_PATCH 2018-12-04 19:45:01 +11:00
xmon powerpc/xmon: add read-only mode 2019-05-03 02:54:57 +10:00
Kbuild powerpc: Add -Werror at arch/powerpc level 2018-10-19 00:56:17 +11:00
Kconfig powerpc/32: Add KASAN support 2019-05-03 01:20:26 +10:00
Kconfig.debug powerpc/xmon: add read-only mode 2019-05-03 02:54:57 +10:00
Makefile powerpc: vdso: Make vdso32 installation conditional in vdso_install 2019-04-20 22:02:12 +10:00
Makefile.postlink