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Greg Ungerer 78b881a23b fs: binfmt_elf_efpic: fix personality for ELF-FDPIC 
commit 7c31515857 upstream.

The elf-fdpic loader hard sets the process personality to either
PER_LINUX_FDPIC for true elf-fdpic binaries or to PER_LINUX for normal ELF
binaries (in this case they would be constant displacement compiled with
-pie for example).  The problem with that is that it will lose any other
bits that may be in the ELF header personality (such as the "bug
emulation" bits).

On the ARM architecture the ADDR_LIMIT_32BIT flag is used to signify a
normal 32bit binary - as opposed to a legacy 26bit address binary.  This
matters since start_thread() will set the ARM CPSR register as required
based on this flag.  If the elf-fdpic loader loses this bit the process
will be mis-configured and crash out pretty quickly.

Modify elf-fdpic loader personality setting so that it preserves the upper
three bytes by using the SET_PERSONALITY macro to set it.  This macro in
the generic case sets PER_LINUX and preserves the upper bytes.
Architectures can override this for their specific use case, and ARM does
exactly this.

The problem shows up quite easily running under qemu using the ARM
architecture, but not necessarily on all types of real ARM hardware.  If
the underlying ARM processor does not support the legacy 26-bit addressing
mode then everything will work as expected.

Link: https://lkml.kernel.org/r/20230907011808.2985083-1-gerg@kernel.org
Fixes: 1bde925d23 ("fs/binfmt_elf_fdpic.c: provide NOMMU loader for regular ELF binaries")
Signed-off-by: Greg Ungerer <gerg@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Greg Ungerer <gerg@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2023-10-10 21:43:40 +02:00
Documentation Documentation: security-bugs.rst: update preferences when dealing with the linux-distros group 2023-08-11 11:33:53 +02:00
arch parisc: irq: Make irq_stack_union static to avoid sparse warning 2023-10-10 21:43:39 +02:00
block block: bio-integrity: Copy flags when bio_integrity_payload is cloned 2023-03-11 16:26:35 +01:00
certs certs/blacklist_hashes.c: fix const confusion in certs blacklist 2022-06-25 11:46:44 +02:00
crypto X.509: if signature is unsupported skip validation 2023-09-23 10:47:01 +02:00
drivers ata: libata-core: Fix port and device removal 2023-10-10 21:43:40 +02:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:20:30 +01:00
fs fs: binfmt_elf_efpic: fix personality for ELF-FDPIC 2023-10-10 21:43:40 +02:00
include ata: libata-sata: increase PMP SRST timeout to 10s 2023-10-10 21:43:40 +02:00
init init, x86: Move mem_encrypt_init() into arch_cpu_finalize_init() 2023-08-08 19:48:24 +02:00
ipc ipc/sem: Fix dangling sem_array access in semtimedop race 2022-12-08 11:16:33 +01:00
kernel ring-buffer: Avoid softlockup in ring_buffer_resize() 2023-10-10 21:43:39 +02:00
lib kobject: Add sanity check for kset->kobj.ktype in kset_register() 2023-09-23 10:47:05 +02:00
mm treewide: Remove uninitialized_var() usage 2023-08-11 11:33:32 +02:00
net dccp: fix dccp_v4_err()/dccp_v6_err() again 2023-10-10 21:43:38 +02:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-26 11:40:31 +01:00
scripts lib/ubsan: remove returns-nonnull-attribute checks 2023-09-23 10:46:52 +02:00
security smackfs: Prevent underflow in smk_set_cipso() 2023-09-23 10:46:56 +02:00
sound ALSA: pcm: Fix missing fixup call in compat hw_refine ioctl 2023-09-23 10:46:59 +02:00
tools selftests/ftrace: Correctly enable event in instance-event.tc 2023-10-10 21:43:39 +02:00
usr initramfs: restore default compression behavior 2020-04-13 10:34:19 +02:00
virt KVM: arm64: vgic: Fix exit condition in scan_its_table() 2022-11-03 23:50:50 +09:00
.cocciconfig
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.get_maintainer.ignore
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.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore kbuild: rpm-pkg: keep spec file until make mrproper 2018-02-13 10:19:46 +01:00
.mailmap .mailmap: Add Maciej W. Rozycki's Imagination e-mail address 2017-11-10 12:16:15 -08:00
COPYING
…
CREDITS MAINTAINERS: update TPM driver infrastructure changes 2017-11-09 17:58:40 -08:00
Kbuild License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
MAINTAINERS Remove DECnet support from kernel 2023-06-21 15:38:58 +02:00
Makefile Linux 4.14.326 2023-09-23 10:47:06 +02:00
README README: add a new README file, pointing to the Documentation/ 2016-10-24 08:12:35 -02:00

README 

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

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

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.