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Shung-Hsi Yu 291d044fd5 bpf: Fix precision tracking for BPF_ALU | BPF_TO_BE | BPF_END 
BPF_END and BPF_NEG has a different specification for the source bit in
the opcode compared to other ALU/ALU64 instructions, and is either
reserved or use to specify the byte swap endianness. In both cases the
source bit does not encode source operand location, and src_reg is a
reserved field.

backtrack_insn() currently does not differentiate BPF_END and BPF_NEG
from other ALU/ALU64 instructions, which leads to r0 being incorrectly
marked as precise when processing BPF_ALU | BPF_TO_BE | BPF_END
instructions. This commit teaches backtrack_insn() to correctly mark
precision for such case.

While precise tracking of BPF_NEG and other BPF_END instructions are
correct and does not need fixing, this commit opt to process all BPF_NEG
and BPF_END instructions within the same if-clause to better align with
current convention used in the verifier (e.g. check_alu_op).

Fixes: b5dc0163d8 ("bpf: precise scalar_value tracking")
Cc: stable@vger.kernel.org
Reported-by: Mohamed Mahmoud <mmahmoud@redhat.com>
Closes: https://lore.kernel.org/r/87jzrrwptf.fsf@toke.dk
Tested-by: Toke Høiland-Jørgensen <toke@redhat.com>
Tested-by: Tao Lyu <tao.lyu@epfl.ch>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Shung-Hsi Yu <shung-hsi.yu@suse.com>
Link: https://lore.kernel.org/r/20231102053913.12004-2-shung-hsi.yu@suse.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
History 2023-11-01 22:54:27 -07:00
arch asm-generic updates for v6.7 2023-11-01 15:28:33 -10:00
block for-6.7/block-2023-10-30 2023-11-01 12:30:07 -10:00
certs certs: Reference revocation list for all keyrings 2023-08-17 20:12:41 +00:00
crypto KEYS: asymmetric: Fix sign/verify on pkcs1pad without a hash 2023-10-18 12:27:10 +08:00
Documentation bpf: Add __bpf_kfunc_{start,end}_defs macros 2023-11-01 22:33:53 -07:00
drivers net: mdio: fill in missing MODULE_DESCRIPTION()s 2023-11-01 21:50:57 -07:00
fs Bootconfig for v6.7: 2023-11-01 16:07:05 -10:00
include bpf: Add __bpf_hook_{start,end} macros 2023-11-01 22:33:53 -07:00
init asm-generic updates for v6.7 2023-11-01 15:28:33 -10:00
io_uring io_uring-futex-2023-10-30 2023-11-01 11:25:08 -10:00
ipc ipc: convert to new timestamp accessors 2023-10-18 14:08:30 +02:00
kernel bpf: Fix precision tracking for BPF_ALU | BPF_TO_BE | BPF_END 2023-11-01 22:54:27 -07:00
lib Probes updates for v6.7: 2023-11-01 16:15:42 -10:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm asm-generic updates for v6.7 2023-11-01 15:28:33 -10:00
net bpf: Add __bpf_hook_{start,end} macros 2023-11-01 22:33:53 -07:00
rust workqueue: Add rust bindings for v6.7 2023-10-30 20:35:48 -10:00
samples Probes updates for v6.7: 2023-11-01 16:15:42 -10:00
scripts asm-generic updates for v6.7 2023-11-01 15:28:33 -10:00
security for-6.7/block-2023-10-30 2023-11-01 12:30:07 -10:00
sound vfs-6.7.iov_iter 2023-10-30 09:24:21 -10:00
tools selftests/bpf: Add test for using css_task iter in sleepable progs 2023-11-01 22:49:20 -07:00
usr arch: Remove Itanium (IA-64) architecture 2023-09-11 08:13:17 +00:00
virt ARM: 2023-09-07 13:52:20 -07:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: rpm-pkg: rename binkernel.spec to kernel.spec 2023-07-25 00:59:33 +09:00
.mailmap 20 hotfixes. 12 are cc:stable and the remainder address post-6.5 issues 2023-10-24 09:52:16 -10:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS USB: Remove Wireless USB and UWB documentation 2023-08-09 14:17:32 +02:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Probes updates for v6.7: 2023-11-01 16:15:42 -10:00
Makefile asm-generic updates for v6.7 2023-11-01 15:28:33 -10:00
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.