GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-03-16 04:04:06 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions
No description
1152748 commits 24 branches 25 tags 2.7 GiB
C 97.9%
Assembly 1.1%
Shell 0.4%
Makefile 0.3%
Python 0.1%
Find a file
Linus Torvalds 7c08461253 m68k: remove broken strcmp implementation 
The m68 hand-written assembler version of strcmp() has always been
broken: it returns the difference between the first non-matching byte
done as a 8-bit subtraction.

That is _almost_ right, but is broken for the overflow case.  The
strcmp() function should indeed return the sign of the difference
between the first byte that differs, but the subtraction needs to be
done in a wider type than 'char'.  Otherwise the ordering isn't actually
stable.

This went unnoticed for basically forever, because nobody ever cares
about non-US-ASCII orderings in the kernel (in fact, most users only
care about "exact match or not"), so overflows don't really happen in
practice, even if it was very very wrong.

But that mostly unnoticeable bug becomes very noticeable by the recent
change to make 'char' be unsigned in the kernel across all architectures
(commit 3bc753c06d: "kbuild: treat char as always unsigned"). Because
the code not only did the subtraction in the wrong type width, it also
used 'char' to then make the compiler expand the result from an 8-bit
difference to the 'int' return value.

So now with an unsigned char that incorrect arithmetic width was then
not even sign-expanded, and always returned just a positive integer.

We could re-instate the old broken code by just turning the 'char' into
'signed char' as has been done elsewhere where people depended on the
signedness of 'char', but since the whole function was broken to begin
with, and we have a non-broken default fallback implementation, let's
just remove this broken function entirely.

Reported-by: Guenter Roeck <linux@roeck-us.net>
Link: https://lore.kernel.org/lkml/20221221145332.GA2399037@roeck-us.net/
Cc: Jason Donenfeld <Jason@zx2c4.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2022-12-21 08:56:43 -08:00
arch m68k: remove broken strcmp implementation 2022-12-21 08:56:43 -08:00
block Driver Core changes for 6.2-rc1 2022-12-16 03:54:54 -08:00
certs certs: make system keyring depend on built-in x509 parser 2022-09-24 04:31:18 +09:00
crypto This update includes the following changes: 2022-12-14 12:31:09 -08:00
Documentation Including fixes from bpf, netfilter and can. 2022-12-21 08:41:32 -08:00
drivers Including fixes from bpf, netfilter and can. 2022-12-21 08:41:32 -08:00
fs Including fixes from bpf, netfilter and can. 2022-12-21 08:41:32 -08:00
include Including fixes from bpf, netfilter and can. 2022-12-21 08:41:32 -08:00
init Kbuild updates for v6.2 2022-12-19 12:33:32 -06:00
io_uring for-6.2/block-2022-12-08 2022-12-13 10:43:59 -08:00
ipc Non-MM patches for 6.2-rc1. 2022-12-12 17:28:58 -08:00
kernel Including fixes from bpf, netfilter and can. 2022-12-21 08:41:32 -08:00
lib SPDX/License additions for 6.2-rc1 2022-12-20 08:53:16 -06:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm - A few late-breaking minor fixups 2022-12-19 06:58:57 -06:00
net Including fixes from bpf, netfilter and can. 2022-12-21 08:41:32 -08:00
rust rust: types: add Opaque type 2022-12-04 01:59:16 +01:00
samples Char/Misc driver changes for 6.2-rc1 2022-12-16 03:49:24 -08:00
scripts Kbuild updates for v6.2 2022-12-19 12:33:32 -06:00
security fs.vfsuid.ima.v6.2-rc1 2022-12-21 08:13:01 -08:00
sound soundwire updates for 6.2 2022-12-19 08:47:33 -06:00
tools Including fixes from bpf, netfilter and can. 2022-12-21 08:41:32 -08:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt ARM64: 2022-12-15 11:12:21 -08:00
.clang-format iommufd for 6.2 2022-12-14 09:15:43 -08:00
.cocciconfig
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore kbuild: Cleanup DT Overlay intermediate files as appropriate 2022-11-18 14:45:30 -06:00
.mailmap Non-MM patches for 6.2-rc1. 2022-12-12 17:28:58 -08:00
.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 MAINTAINERS: zram: zsmalloc: Add an additional co-maintainer 2022-12-15 16:37:49 -08:00
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 ARM: SoC fixes for 6.2 2022-12-19 16:07:59 -06:00
Makefile Kbuild updates for v6.2 2022-12-19 12:33:32 -06:00
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.