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a1010fce1c
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Alexei Starovoitov a1010fce1c Merge branch 'use-overflow-h-helpers-to-check-for-overflows' 
Shung-Hsi Yu says:

====================
Use overflow.h helpers to check for overflows

This patch set refactors kernel/bpf/verifier.c to use type-agnostic, generic
overflow-check helpers defined in include/linux/overflow.h to check for addition
and subtraction overflow, and drop the signed_*_overflows() helpers we currently
have in kernel/bpf/verifier.c; with a fix for overflow check in adjust_jmp_off()
in patch 1.

There should be no functional change in how the verifier works and  the main
motivation is to make future refactoring[1] easier.

While check_mul_overflow() also exists and could potentially replace what
we have in scalar*_min_max_mul(), it does not help with refactoring and
would either change how the verifier works (e.g. lifting restriction on
umax<=U32_MAX and u32_max<=U16_MAX) or make the code slightly harder to
read, so it is left for future endeavour.

Changes from v2 <https://lore.kernel.org/r/20240701055907.82481-1-shung-hsi.yu@suse.com>
- add fix for 5337ac4c9b ("bpf: Fix the corner case with may_goto and jump to
  the 1st insn.") to correct the overflow check for general jump instructions
- adapt to changes in commit 5337ac4c9b ("bpf: Fix the corner case with
  may_goto and jump to the 1st insn.")
  - refactor in adjust_jmp_off() as well and remove signed_add16_overflow()

Changes from v1 <https://lore.kernel.org/r/20240623070324.12634-1-shung-hsi.yu@suse.com>:
- use pointers to values in dst_reg directly as the sum/diff pointer and
  remove the else branch (Jiri)
- change local variables to be dst_reg pointers instead of src_reg values
- include comparison of generated assembly before & after the change
  (Alexei)

1: https://github.com/kernel-patches/bpf/pull/7205/commits
====================

Link: https://lore.kernel.org/r/20240712080127.136608-1-shung-hsi.yu@suse.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2024-07-12 08:54:17 -07:00
arch bpf, arm64: Fix trampoline for BPF_TRAMP_F_CALL_ORIG 2024-07-11 17:56:30 +02:00
block block: unmap and free user mapped integrity via submitter 2024-06-12 11:00:50 -06:00
certs kbuild: use $(src) instead of $(srctree)/$(src) for source directory 2024-05-10 04:34:52 +09:00
crypto This push fixes a bug in the new ecc P521 code as well as a buggy 2024-05-20 08:47:54 -07:00
Documentation dt-bindings: net: fsl,fman: add ptimer-handle property 2024-07-09 11:33:39 -07:00
drivers net: ti: icssg-prueth: add missing deps 2024-07-09 11:36:17 -07:00
fs bpf-next-for-netdev 2024-07-09 17:01:46 +02:00
include bpf-next-for-netdev 2024-07-09 17:01:46 +02:00
init gcc: disable '-Warray-bounds' for gcc-9 2024-06-15 10:43:04 -07:00
io_uring Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-07-04 14:16:11 -07:00
ipc Mainly singleton patches, documented in their respective changelogs. 2024-05-19 14:02:03 -07:00
kernel bpf: use check_sub_overflow() to check for subtraction overflows 2024-07-12 08:54:08 -07:00
lib bpf-next-for-netdev 2024-07-09 17:01:46 +02:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm: avoid overflows in dirty throttling logic 2024-07-03 12:29:24 -07:00
net bpf: Remove tst_run from lwt_seg6local_prog_ops. 2024-07-10 09:58:52 -07:00
rust rust: avoid unused import warning in rusttest 2024-06-11 23:33:28 +02:00
samples bpf-next-for-netdev 2024-05-28 07:27:29 -07:00
scripts bpf-next-for-netdev 2024-07-09 17:01:46 +02:00
security lsm/stable-6.10 PR 20240617 2024-06-17 18:35:12 -07:00
sound ASoC: Fixes for v6.10 2024-06-26 22:02:55 +02:00
tools selftests/bpf: Close obj in error path in xdp_adjust_tail 2024-07-10 12:42:50 -07:00
usr kbuild: use $(src) instead of $(srctree)/$(src) for source directory 2024-05-10 04:34:52 +09:00
virt KVM fixes for 6.10 2024-06-21 08:03:55 -04:00
.clang-format clang-format: Update with v6.7-rc4's for_each macro list 2023-12-08 23:54:38 +01:00
.cocciconfig
.editorconfig .editorconfig: remove trim_trailing_whitespace option 2024-06-13 16:47:52 +02:00
.get_maintainer.ignore Add Jeff Kirsher to .get_maintainer.ignore 2024-03-08 11:36:54 +00:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: create a list of all built DTB files 2024-02-19 18:20:39 +09:00
.mailmap bpf-for-netdev 2024-06-14 17:57:10 -07:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING
CREDITS MAINTAINERS: Remembering Larry Finger 2024-06-26 20:34:51 +03:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig
MAINTAINERS Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2024-07-04 14:16:11 -07:00
Makefile Linux 6.10-rc6 2024-06-30 14:40:44 -07:00
README README: Fix spelling 2024-03-18 03:36:32 -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 reStructuredText 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.