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Niklas Cassel 4626a093d1 binfmt_flat: do not stop relocating GOT entries prematurely on riscv 
commit 6045ab5fea upstream.

bFLT binaries are usually created using elf2flt.

The linker script used by elf2flt has defined the .data section like the
following for the last 19 years:

.data : {
	_sdata = . ;
	__data_start = . ;
	data_start = . ;
	*(.got.plt)
	*(.got)
	FILL(0) ;
	. = ALIGN(0x20) ;
	LONG(-1)
	. = ALIGN(0x20) ;
	...
}

It places the .got.plt input section before the .got input section.
The same is true for the default linker script (ld --verbose) on most
architectures except x86/x86-64.

The binfmt_flat loader should relocate all GOT entries until it encounters
a -1 (the LONG(-1) in the linker script).

The problem is that the .got.plt input section starts with a GOTPLT header
(which has size 16 bytes on elf64-riscv and 8 bytes on elf32-riscv), where
the first word is set to -1. See the binutils implementation for riscv [1].

This causes the binfmt_flat loader to stop relocating GOT entries
prematurely and thus causes the application to crash when running.

Fix this by skipping the whole GOTPLT header, since the whole GOTPLT header
is reserved for the dynamic linker.

The GOTPLT header will only be skipped for bFLT binaries with flag
FLAT_FLAG_GOTPIC set. This flag is unconditionally set by elf2flt if the
supplied ELF binary has the symbol _GLOBAL_OFFSET_TABLE_ defined.
ELF binaries without a .got input section should thus remain unaffected.

Tested on RISC-V Canaan Kendryte K210 and RISC-V QEMU nommu_virt_defconfig.

[1] https://sourceware.org/git/?p=binutils-gdb.git;a=blob;f=bfd/elfnn-riscv.c;hb=binutils-2_38#l3275

Cc: <stable@vger.kernel.org>
Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com>
Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Link: https://lore.kernel.org/r/20220414091018.896737-1-niklas.cassel@wdc.com
Fixed-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/lkml/202204182333.OIUOotK8-lkp@intel.com
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-06-14 16:53:43 +02:00
arch x86/pci/xen: Disable PCI/MSI[-X] masking for XEN_HVM guests 2022-06-06 08:20:56 +02:00
block block-map: add __GFP_ZERO flag for alloc_page in function bio_copy_kern 2022-06-06 08:20:57 +02:00
certs certs: Trigger creation of RSA module signing key if it's not an RSA key 2021-09-22 11:45:19 +02:00
crypto crypto: authenc - Fix sleep in atomic context in decrypt_tail 2022-04-20 09:08:12 +02:00
Documentation docs: submitting-patches: Fix crossref to 'The canonical patch format' 2022-06-06 08:20:57 +02:00
drivers tpm: ibmvtpm: Correct the return value in tpm_ibmvtpm_probe() 2022-06-06 08:20:57 +02:00
firmware Fix built-in early-load Intel microcode alignment 2020-01-23 08:20:30 +01:00
fs binfmt_flat: do not stop relocating GOT entries prematurely on riscv 2022-06-14 16:53:43 +02:00
include netfilter: conntrack: re-fetch conntrack after insertion 2022-06-06 08:20:57 +02:00
init init/main.c: return 1 from handled __setup() functions 2022-04-20 09:08:28 +02:00
ipc ipc: WARN if trying to remove ipc object which is absent 2021-12-08 08:46:53 +01:00
kernel perf: Fix sys_perf_event_open() race against self 2022-05-25 08:41:19 +02:00
lib assoc_array: Fix BUG_ON during garbage collect 2022-06-06 08:20:56 +02:00
mm zsmalloc: fix races between asynchronous zspage free and page migration 2022-06-06 08:20:57 +02:00
net bpf: Enlarge offset check value to INT_MAX in bpf_skb_{load,store}_bytes 2022-06-06 08:20:58 +02:00
samples samples/kretprobes: Fix return value if register_kretprobe() failed 2021-11-26 11:40:31 +01:00
scripts gcc-plugins: latent_entropy: use /dev/urandom 2022-04-20 09:08:32 +02:00
security Fix incorrect type in assignment of ipv6 port for audit 2022-04-20 09:08:21 +02:00
sound ALSA: wavefront: Proper check of get_user() error 2022-05-25 08:41:19 +02:00
tools perf bench numa: Address compiler error on s390 2022-05-25 08:41:21 +02:00
usr initramfs: restore default compression behavior 2020-04-13 10:34:19 +02:00
virt KVM: Prevent module exit until all VMs are freed 2022-04-20 09:08:24 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore
.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 MAINTAINERS: Update drm/i915 bug filing URL 2020-02-28 16:36:12 +01:00
Makefile Linux 4.14.282 2022-06-06 08:20:58 +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.