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Christophe Leroy 2fc1c63d27 powerpc/highmem: Properly handle fragmented memory 
In addition to checking whether a page is reserved before allocating
it to highmem, verify that it is valid memory.

Otherwise the kernel Oopses as below:

  mem auto-init: stack:off, heap alloc:off, heap free:off
  Kernel attempted to read user page (7df58) - exploit attempt? (uid: 0)
  BUG: Unable to handle kernel data access on read at 0x0007df58
  Faulting instruction address: 0xc01c8348
  Oops: Kernel access of bad area, sig: 11 [#1]
  BE PAGE_SIZE=4K SMP NR_CPUS=2 P2020RDB-PC
  Modules linked in:
  CPU: 0 PID: 0 Comm: swapper Not tainted 6.0.0-rc2-0caacb197b677410bdac81bc34f05235+ #121
  NIP:  c01c8348 LR: c01cb2bc CTR: 0000000a
  REGS: c10d7e20 TRAP: 0300   Not tainted  (6.0.0-rc2-0caacb197b677410bdac81bc34f05235+)
  MSR:  00021000 <CE,ME>  CR: 48044224  XER: 00000000
  DEAR: 0007df58 ESR: 00000000
  GPR00: c01cb294 c10d7f10 c1045340 00000001 00000004 c112bcc0 00000015 eedf1000
  GPR08: 00000003 0007df58 00000000 f0000000 28044228 00000200 00000000 00000000
  GPR16: 00000000 00000000 00000000 0275cb7a c0000000 00000001 0000075f 00000000
  GPR24: c1031004 00000000 00000000 00000001 c10f0000 eedf1000 00080000 00080000
  NIP free_unref_page_prepare.part.93+0x48/0x60
  LR  free_unref_page+0x84/0x4b8
  Call Trace:
    0xeedf1000 (unreliable)
    free_unref_page+0x5c/0x4b8
    mem_init+0xd0/0x194
    start_kernel+0x4c0/0x6d0
    set_ivor+0x13c/0x178

Reported-by: Pali Rohár <pali@kernel.org>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Fixes: b0e0d68b1c ("powerpc/32: Allow fragmented physical memory")
Tested-by: Pali Rohár <pali@kernel.org>
[mpe: Trim oops]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/f08cca5c46d67399c53262eca48e015dcf1841f9.1663695394.git.christophe.leroy@csgroup.eu
History 2022-09-26 20:58:19 +10:00
arch powerpc/highmem: Properly handle fragmented memory 2022-09-26 20:58:19 +10:00
block block-6.0-2022-08-19 2022-08-20 10:17:05 -07:00
certs Kbuild updates for v5.20 2022-08-10 10:40:41 -07:00
crypto crypto: blake2b: effectively disable frame size warning 2022-08-10 17:59:11 -07:00
Documentation powerpc/pseries: Implement CONFIG_PARAVIRT_TIME_ACCOUNTING 2022-09-05 14:14:02 +10:00
drivers macintosh: Add missing of_node_get() in do_attach() 2022-09-05 17:30:24 +10:00
fs 5 cifs/smb3 fixes, one for stable 2022-08-21 10:21:16 -07:00
include powerpc: Rely on generic definition of hugepd_t and is_hugepd when unused 2022-09-26 20:58:18 +10:00
init powerpc/64: Remove PPC64 special case for cputime accounting default 2022-09-05 14:14:27 +10:00
io_uring io_uring/net: use right helpers for async_data 2022-08-18 07:27:20 -06:00
ipc Updates to various subsystems which I help look after. lib, ocfs2, 2022-08-07 10:03:24 -07:00
kernel Various fixes for tracing: 2022-08-21 14:49:42 -07:00
lib lib/cpumask: drop always-true preprocessor guard 2022-08-15 11:00:44 -07:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm - hugetlb_vmemmap cleanups from Muchun Song 2022-08-10 11:18:00 -07:00
net tcp: handle pure FIN case correctly 2022-08-18 11:04:56 -07:00
samples Tracing updates for 5.20 / 6.0 2022-08-05 09:41:12 -07:00
scripts asm goto: eradicate CC_HAS_ASM_GOTO 2022-08-21 10:06:28 -07:00
security hardening fixes for v6.0-rc2 2022-08-19 13:56:14 -07:00
sound sound fixes for 6.0-rc2 2022-08-19 09:46:11 -07:00
tools selftests/powerpc: Skip 4PB test on 4K PAGE_SIZE systems 2022-09-04 22:39:59 +10:00
usr Not a lot of material this cycle. Many singleton patches against various 2022-05-27 11:22:03 -07:00
virt KVM: Drop unnecessary initialization of "ops" in kvm_ioctl_create_device() 2022-08-19 04:05:43 -04:00
.clang-format PCI/DOE: Add DOE mailbox support functions 2022-07-19 15:38:04 -07:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore kbuild: split the second line of *.mod into *.usyms 2022-05-08 03:16:59 +09:00
.mailmap Updates to various subsystems which I help look after. lib, ocfs2, 2022-08-07 10:03:24 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS drm for 5.20/6.0 2022-08-03 19:52:08 -07:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS 5 cifs/smb3 fixes, one for stable 2022-08-21 10:21:16 -07:00
Makefile Linux 6.0-rc2 2022-08-21 17:32:54 -07:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.