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Krzysztof Wilczyński 35f3da7e74 PCI: Return ~0 data on pciconfig_read() CAP_SYS_ADMIN failure 
commit a8bd29bd49 upstream.

The pciconfig_read() syscall reads PCI configuration space using
hardware-dependent config accessors.

If the read fails on PCI, most accessors don't return an error; they
pretend the read was successful and got ~0 data from the device, so the
syscall returns success with ~0 data in the buffer.

When the accessor does return an error, pciconfig_read() normally fills the
user's buffer with ~0 and returns an error in errno.  But after
e4585da22a ("pci syscall.c: Switch to refcounting API"), we don't fill
the buffer with ~0 for the EPERM "user lacks CAP_SYS_ADMIN" error.

Userspace may rely on the ~0 data to detect errors, but after e4585da22a,
that would not detect CAP_SYS_ADMIN errors.

Restore the original behaviour of filling the buffer with ~0 when the
CAP_SYS_ADMIN check fails.

[bhelgaas: commit log, fold in Nathan's fix
https://lore.kernel.org/r/20210803200836.500658-1-nathan@kernel.org]
Fixes: e4585da22a ("pci syscall.c: Switch to refcounting API")
Link: https://lore.kernel.org/r/20210729233755.1509616-1-kw@linux.com
Signed-off-by: Krzysztof Wilczyński <kw@linux.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2021-09-22 11:45:25 +02:00
arch ARM: 9105/1: atags_to_fdt: don't warn about stack size 2021-09-22 11:45:25 +02:00
block block: bfq: fix bfq_set_next_ioprio_data() 2021-09-22 11:45:24 +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: shash - avoid comparing pointers to exported functions under CFI 2021-07-20 16:17:32 +02:00
Documentation KVM: X86: MMU: Use the correct inherited permissions to get shadow page 2021-09-03 09:56:26 +02:00
drivers PCI: Return ~0 data on pciconfig_read() CAP_SYS_ADMIN failure 2021-09-22 11:45:25 +02:00
firmware
fs CIFS: Fix a potencially linear read overflow 2021-09-22 11:45:22 +02:00
include crypto: public_key: fix overflow during implicit conversion 2021-09-22 11:45:24 +02:00
init pid: take a reference when initializing cad_pid 2021-06-10 12:43:51 +02:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2020-05-20 08:17:07 +02:00
kernel workqueue: fix UAF in pwq_unbound_release_workfn() 2021-08-04 12:22:14 +02:00
lib lib/decompress_unlz4.c: correctly handle zero-padding around initrds. 2021-07-20 16:17:51 +02:00
mm mm/page_alloc: speed up the iteration of max_order 2021-09-22 11:45:16 +02:00
net 9p/xen: Fix end of loop tests for list_for_each_entry 2021-09-22 11:45:24 +02:00
samples samples/bpf: Fix the error return code of xdp_redirect's main() 2021-07-20 16:17:37 +02:00
scripts scripts/tracing: fix the bug that can't parse raw_trace_func 2021-08-15 13:03:31 +02:00
security IMA: remove -Wmissing-prototypes warning 2021-09-22 11:45:23 +02:00
sound ALSA: pcm: fix divide error in snd_pcm_lib_ioctl 2021-09-22 11:45:15 +02:00
tools Revert "perf map: Fix dso->nsinfo refcounting" 2021-08-04 12:22:17 +02:00
usr initramfs: restore default compression behavior 2020-04-13 10:34:19 +02:00
virt KVM: Use kvm_pfn_t for local PFN variable in hva_to_pfn_remapped() 2021-08-08 08:53:29 +02:00
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Makefile Linux 4.14.246 2021-09-03 09:56:26 +02:00
README

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.