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Maciej Żenczykowski 1f7495df50 bpf: Fix regression on BPF_OBJ_GET with non-O_RDWR flags 
[ Upstream commit 5dec6d96d1 ]

This reverts commit d37300ed18 ("bpf: program: Refuse non-O_RDWR flags
in BPF_OBJ_GET"). It breaks Android userspace which expects to be able to
fetch programs with just read permissions.

See: https://cs.android.com/android/platform/superproject/+/master:frameworks/libs/net/common/native/bpf_syscall_wrappers/include/BpfSyscallWrappers.h;drc=7005c764be23d31fa1d69e826b4a2f6689a8c81e;l=124

Side-note: another option to fix it would be to extend bpf_prog_new_fd()
and to pass in used file mode flags in the same way as we do for maps via
bpf_map_new_fd(). Meaning, they'd end up in anon_inode_getfd() and thus
would be retained for prog fd operations with bpf() syscall. Right now
these flags are not checked with progs since they are immutable for their
lifetime (as opposed to maps which can be updated from user space). In
future this could potentially change with new features, but at that point
it's still fine to do the bpf_prog_new_fd() extension when needed. For a
simple stable fix, a revert is less churn.

Fixes: d37300ed18 ("bpf: program: Refuse non-O_RDWR flags in BPF_OBJ_GET")
Signed-off-by: Maciej Żenczykowski <maze@google.com>
[ Daniel: added side-note to commit message ]
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Lorenz Bauer <lmb@cloudflare.com>
Acked-by: Greg Kroah-Hartman <gregkh@google.com>
Link: https://lore.kernel.org/bpf/20210618105526.265003-1-zenczykowski@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2021-07-14 17:07:14 +02:00
arch x86/hyperv: fix logical processor creation 2021-07-14 17:06:51 +02:00
block blk-mq: update hctx->dispatch_busy in case of real scheduler 2021-07-14 17:06:53 +02:00
certs Kbuild updates for v5.13 (2nd) 2021-05-08 10:00:11 -07:00
crypto crypto: sm2 - fix a memory leak in sm2 2021-07-14 17:06:44 +02:00
Documentation clocksource: Retry clock read if long delays detected 2021-07-14 17:06:36 +02:00
drivers iwlwifi: increase PNVM load timeout 2021-07-14 17:07:14 +02:00
fs dax: fix ENOMEM handling in grab_mapping_entry() 2021-07-14 17:06:53 +02:00
include net: sched: add barrier to ensure correct ordering for lockless qdisc 2021-07-14 17:07:12 +02:00
init sched/core: Initialize the idle task with preemption disabled 2021-07-14 17:06:21 +02:00
ipc ipc/mqueue, msg, sem: avoid relying on a stack reference past its expiry 2021-05-22 15:09:07 -10:00
kernel bpf: Fix regression on BPF_OBJ_GET with non-O_RDWR flags 2021-07-14 17:07:14 +02:00
lib lockdep/selftests: Fix selftests vs PROVE_RAW_LOCK_NESTING 2021-07-14 17:06:48 +02:00
LICENSES LICENSES: Add the CC-BY-4.0 license 2020-12-08 10:33:27 -07:00
mm mm/page_alloc: fix counting of managed_pages 2021-07-14 17:06:54 +02:00
net netfilter: nf_tables: do not allow to delete table with owner by handle 2021-07-14 17:07:14 +02:00
samples samples/bpf: Fix the error return code of xdp_redirect's main() 2021-07-14 17:07:08 +02:00
scripts kbuild: Fix objtool dependency for 'OBJECT_FILES_NON_STANDARD_<obj> := n' 2021-07-14 17:06:40 +02:00
security evm: fix writing <securityfs>/evm overflow 2021-07-14 17:06:40 +02:00
sound ALSA: hda/realtek: fix mute led of the HP Pavilion 15-eh1xxx series 2021-07-14 17:06:04 +02:00
tools selftests: tls: fix chacha+bidir tests 2021-07-14 17:07:13 +02:00
usr .gitignore: prefix local generated files with a slash 2021-05-02 00:43:35 +09:00
virt KVM: do not allow mapping valid but non-reference-counted pages 2021-06-24 11:55:11 -04:00
.clang-format clang-format: Update with the latest for_each macro list 2021-05-12 23:32:39 +02:00
.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 .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap mailmap: add Marek's other e-mail address and identity without diacritics 2021-06-24 19:40:54 -07:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: move Murali Karicheri to credits 2021-04-29 15:47:30 -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 Merge branch 'akpm' (patches from Andrew) 2021-06-25 11:05:03 -07:00
Makefile Makefile: fix GDB warning with CONFIG_RELR 2021-07-14 17:06:25 +02:00
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.