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Helge Deller 6ca32e2e77 Revert "parisc: Fix backtrace to always include init funtion names" 
commit 98400ad75e upstream.

This reverts commit 279917e27e.

With the CONFIG_HARDENED_USERCOPY option enabled, this patch triggers
kernel bugs at runtime:

  usercopy: Kernel memory overwrite attempt detected to kernel text (offset 2084839, size 6)!
  kernel BUG at mm/usercopy.c:99!
 Backtrace:
  IAOQ[0]: usercopy_abort+0xc4/0xe8
  [<00000000406ed1c8>] __check_object_size+0x174/0x238
  [<00000000407086d4>] copy_strings.isra.0+0x3e8/0x708
  [<0000000040709a20>] do_execveat_common.isra.0+0x1bc/0x328
  [<000000004070b760>] compat_sys_execve+0x7c/0xb8
  [<0000000040303eb8>] syscall_exit+0x0/0x14

The problem is, that we have an init section of at least 2MB size which
starts at _stext and is freed after bootup.

If then later some kernel data is (temporarily) stored in this free
memory, check_kernel_text_object() will trigger a bug since the data
appears to be inside the kernel text (>=_stext) area:
        if (overlaps(ptr, len, _stext, _etext))
                usercopy_abort("kernel text");

Signed-off-by: Helge Deller <deller@gmx.de>
Cc: stable@kernel.org # 5.4+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-12-01 09:19:00 +01:00
arch Revert "parisc: Fix backtrace to always include init funtion names" 2021-12-01 09:19:00 +01:00
block block: Check ADMIN before NICE for IOPRIO_CLASS_RT 2021-11-26 10:39:19 +01:00
certs certs: Trigger creation of RSA module signing key if it's not an RSA key 2021-09-15 09:50:29 +02:00
crypto crypto: pcrypt - Delay write to padata->info 2021-11-18 14:04:12 +01:00
Documentation fscrypt: allow 256-bit master keys with AES-256-XTS 2021-11-18 14:03:54 +01:00
drivers media: cec: copy sequence field for the reply 2021-12-01 09:19:00 +01:00
fs btrfs: update device path inode time instead of bd_inode 2021-11-26 10:39:22 +01:00
include bpf: Fix toctou on read-only map's constant scalar tracking 2021-12-01 09:18:58 +01:00
init bootconfig: init: Fix memblock leak in xbc_make_cmdline() 2021-11-21 13:46:35 +01:00
ipc ipc: WARN if trying to remove ipc object which is absent 2021-11-26 10:39:19 +01:00
kernel bpf: Fix toctou on read-only map's constant scalar tracking 2021-12-01 09:18:58 +01:00
lib lib/xz: Validate the value before assigning it to an enum variable 2021-11-18 14:03:58 +01:00
LICENSES LICENSES/deprecated: add Zlib license text 2020-09-16 14:33:49 +02:00
mm hugetlbfs: flush TLBs correctly after huge_pmd_unshare 2021-11-26 10:39:21 +01:00
net net: nexthop: fix null pointer dereference when IPv6 is not enabled 2021-12-01 09:18:59 +01:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-18 14:04:11 +01:00
scripts scripts/lld-version.sh: Rewrite based on upstream ld-version.sh 2021-11-21 13:46:37 +01:00
security selinux: fix NULL-pointer dereference when hashtab allocation fails 2021-11-26 10:39:21 +01:00
sound ALSA: hda/realtek: Fix LED on HP ProBook 435 G7 2021-12-01 09:19:00 +01:00
tools perf tests: Remove bash construct from record+zstd_comp_decomp.sh 2021-11-26 10:39:13 +01:00
usr Merge branch 'work.fdpic' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-08-07 13:29:39 -07:00
virt KVM: do not shrink halt_poll_ns below grow_start 2021-10-09 14:40:58 +02:00
.clang-format RDMA 5.10 pull request 2020-10-17 11:18:18 -07:00
.cocciconfig
.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: generate Module.symvers only when vmlinux exists 2021-05-19 10:12:59 +02:00
.mailmap mailmap: add two more addresses of Uwe Kleine-König 2020-12-06 10:19:07 -08:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Move Jason Cooper to CREDITS 2020-11-30 10:20:34 +01:00
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 f2fs: move ioctl interface definitions to separated file 2021-05-19 10:13:00 +02:00
Makefile Linux 5.10.82 2021-11-26 10:39:22 +01:00
README

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.