Revert "arm64: Mitigate MTE issues with str{n}cmp()"

This reverts commit 59a68d4138086c015ab8241c3267eec5550fbd44.

Now that the str{n}cmp functions have been updated to handle MTE
properly, the wor

Revert "arm64: Mitigate MTE issues with str{n}cmp()"

This reverts commit 59a68d4138086c015ab8241c3267eec5550fbd44.

Now that the str{n}cmp functions have been updated to handle MTE
properly, the workaround to use the generic functions is no longer
needed.

Signed-off-by: Joey Gouly <[email protected]>
Cc: Robin Murphy <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Will Deacon <[email protected]>
Acked-by: Mark Rutland <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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arm64: lib: Import latest version of Arm Optimized Routines' strcmp

Import the latest version of the Arm Optimized Routines strcmp function based
on the upstream code of string/aarch64/strcmp.S at c

arm64: lib: Import latest version of Arm Optimized Routines' strcmp

Import the latest version of the Arm Optimized Routines strcmp function based
on the upstream code of string/aarch64/strcmp.S at commit 189dfefe37d5 from:
https://github.com/ARM-software/optimized-routines

This latest version includes MTE support.

Note that for simplicity Arm have chosen to contribute this code to Linux under
GPLv2 rather than the original MIT OR Apache-2.0 WITH LLVM-exception license.
Arm is the sole copyright holder for this code.

Signed-off-by: Joey Gouly <[email protected]>
Cc: Robin Murphy <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Will Deacon <[email protected]>
Acked-by: Mark Rutland <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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arm64: clean up symbol aliasing

Now that we have SYM_FUNC_ALIAS() and SYM_FUNC_ALIAS_WEAK(), use those
to simplify and more consistently define function aliases across
arch/arm64.

Aliases are now d

arm64: clean up symbol aliasing

Now that we have SYM_FUNC_ALIAS() and SYM_FUNC_ALIAS_WEAK(), use those
to simplify and more consistently define function aliases across
arch/arm64.

Aliases are now defined in terms of a canonical function name. For
position-independent functions I've made the __pi_<func> name the
canonical name, and defined other alises in terms of this.

The SYM_FUNC_{START,END}_PI(func) macros obscure the __pi_<func> name,
and make this hard to seatch for. The SYM_FUNC_START_WEAK_PI() macro
also obscures the fact that the __pi_<func> fymbol is global and the
<func> symbol is weak. For clarity, I have removed these macros and used
SYM_FUNC_{START,END}() directly with the __pi_<func> name.

For example:

SYM_FUNC_START_WEAK_PI(func)
... asm insns ...
SYM_FUNC_END_PI(func)
EXPORT_SYMBOL(func)

... becomes:

SYM_FUNC_START(__pi_func)
... asm insns ...
SYM_FUNC_END(__pi_func)

SYM_FUNC_ALIAS_WEAK(func, __pi_func)
EXPORT_SYMBOL(func)

For clarity, where there are multiple annotations such as
EXPORT_SYMBOL(), I've tried to keep annotations grouped by symbol. For
example, where a function has a name and an alias which are both
exported, this is organised as:

SYM_FUNC_START(func)
... asm insns ...
SYM_FUNC_END(func)
EXPORT_SYMBOL(func)

SYM_FUNC_ALIAS(alias, func)
EXPORT_SYMBOL(alias)

For consistency with the other string functions, I've defined strrchr as
a position-independent function, as it can safely be used as such even
though we have no users today.

As we no longer use SYM_FUNC_{START,END}_ALIAS(), our local copies are
removed. The common versions will be removed by a subsequent patch.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <[email protected]>
Acked-by: Ard Biesheuvel <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Acked-by: Josh Poimboeuf <[email protected]>
Acked-by: Mark Brown <[email protected]>
Cc: Joey Gouly <[email protected]>
Cc: Will Deacon <[email protected]>
Acked-by: Peter Zijlstra (Intel) <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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arm64: Mitigate MTE issues with str{n}cmp()

As with strlen(), the patches importing the updated str{n}cmp()
implementations were originally developed and tested before the
advent of CONFIG_KASAN_HW_

arm64: Mitigate MTE issues with str{n}cmp()

As with strlen(), the patches importing the updated str{n}cmp()
implementations were originally developed and tested before the
advent of CONFIG_KASAN_HW_TAGS, and have subsequently revealed
not to be MTE-safe. Since in-kernel MTE is still a rather niche
case, let it temporarily fall back to the generic C versions for
correctness until we can figure out the best fix.

Fixes: 758602c04409 ("arm64: Import latest version of Cortex Strings' strcmp")
Fixes: 020b199bc70d ("arm64: Import latest version of Cortex Strings' strncmp")
Cc: <[email protected]> # 5.14.x
Reported-by: Branislav Rankov <[email protected]>
Signed-off-by: Robin Murphy <[email protected]>
Acked-by: Mark Rutland <[email protected]>
Link: https://lore.kernel.org/r/34dc4d12eec0adae49b0ac927df642ed10089d40.1631890770.git.robin.murphy@arm.com
Signed-off-by: Catalin Marinas <[email protected]>

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arm64: update string routine copyrights and URLs

To make future archaeology easier, let's have the string routine comment
blocks encode the specific upstream commit ID they were imported from.
These

arm64: update string routine copyrights and URLs

To make future archaeology easier, let's have the string routine comment
blocks encode the specific upstream commit ID they were imported from.
These are the same commit IDs as listed in the commits importing the
code, expanded to 16 characters. Note that the routines have different
commit IDs, each reprsenting the latest upstream commit which changed
the particular routine.

At the same time, let's consistently include 2021 in the copyright
dates.

Signed-off-by: Mark Rutland <[email protected]>
Cc: Catalin Marinas <[email protected]>
Cc: Robin Murphy <[email protected]>
Cc: Will Deacon <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

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arm64: Import latest version of Cortex Strings' strcmp

Import the latest version of the former Cortex Strings - now
Arm Optimized Routines - strcmp function based on the upstream
code of string/aarc

arm64: Import latest version of Cortex Strings' strcmp

Import the latest version of the former Cortex Strings - now
Arm Optimized Routines - strcmp function based on the upstream
code of string/aarch64/strcmp.S at commit afd6244 from
https://github.com/ARM-software/optimized-routines

Note that for simplicity Arm have chosen to contribute this code
to Linux under GPLv2 rather than the original MIT license.

Signed-off-by: Sam Tebbs <[email protected]>
[ rm: update attribution and commit message ]
Signed-off-by: Robin Murphy <[email protected]>
Link: https://lore.kernel.org/r/0fe90c90b96b569fbdfd46e47bd1298abb02079e.1622128527.git.robin.murphy@arm.com
Signed-off-by: Will Deacon <[email protected]>

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arm64: fix spelling mistake "ca not" -> "cannot"

There is a spelling mistake in the comment, Fix it.

Signed-off-by: hankecai <[email protected]>
Signed-off-by: Catalin Marinas <catalin.marinas@ar

arm64: fix spelling mistake "ca not" -> "cannot"

There is a spelling mistake in the comment, Fix it.

Signed-off-by: hankecai <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>

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arm64: lib: Use modern annotations for assembly functions

In an effort to clarify and simplify the annotation of assembly functions
in the kernel new macros have been introduced. These replace ENTRY

arm64: lib: Use modern annotations for assembly functions

In an effort to clarify and simplify the annotation of assembly functions
in the kernel new macros have been introduced. These replace ENTRY and
ENDPROC and also add a new annotation for static functions which previously
had no ENTRY equivalent. Update the annotations in the library code to the
new macros.

Signed-off-by: Mark Brown <[email protected]>
[will: Use SYM_FUNC_START_WEAK_PI]
Signed-off-by: Will Deacon <[email protected]>

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treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234

Based on 1 normalized pattern(s):

this program is free software you can redistribute it and or modify
it under the terms of th

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 234

Based on 1 normalized pattern(s):

this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license version 2 as
published by the free software foundation this program is
distributed in the hope that it will be useful but without any
warranty without even the implied warranty of merchantability or
fitness for a particular purpose see the gnu general public license
for more details you should have received a copy of the gnu general
public license along with this program if not see http www gnu org
licenses

extracted by the scancode license scanner the SPDX license identifier

GPL-2.0-only

has been chosen to replace the boilerplate/reference in 503 file(s).

Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Alexios Zavras <[email protected]>
Reviewed-by: Allison Randal <[email protected]>
Reviewed-by: Enrico Weigelt <[email protected]>
Cc: [email protected]
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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arm64: string: use asm EXPORT_SYMBOL()

For a while now it's been possible to use EXPORT_SYMBOL() in assembly
files, which allows us to place exports immediately after assembly
functions, as we do fo

arm64: string: use asm EXPORT_SYMBOL()

For a while now it's been possible to use EXPORT_SYMBOL() in assembly
files, which allows us to place exports immediately after assembly
functions, as we do for C functions.

As a step towards removing arm64ksyms.c, let's move the string routine
exports to the assembly files the functions are defined in. Routines
which should only be exported for !KASAN builds are exported using the
EXPORT_SYMBOL_NOKASAN() helper.

There should be no functional change as a result of this patch.

Signed-off-by: Mark Rutland <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Catalin Marinas <[email protected]>
Signed-off-by: Will Deacon <[email protected]>

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arm64: lib: use C string functions with KASAN enabled

ARM64 has asm implementation of memchr(), memcmp(), str[r]chr(),
str[n]cmp(), str[n]len(). KASAN don't see memory accesses in asm code,
thus it

arm64: lib: use C string functions with KASAN enabled

ARM64 has asm implementation of memchr(), memcmp(), str[r]chr(),
str[n]cmp(), str[n]len(). KASAN don't see memory accesses in asm code,
thus it can potentially miss many bugs.

Ifdef out __HAVE_ARCH_* defines of these functions when KASAN is enabled,
so the generic implementations from lib/string.c will be used.

We can't just remove the asm functions because efistub uses them. And we
can't have two non-weak functions either, so declare the asm functions as
weak.

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Andrey Ryabinin <[email protected]>
Reported-by: Kyeongdon Kim <[email protected]>
Cc: Alexander Potapenko <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: Dmitry Vyukov <[email protected]>
Cc: Mark Rutland <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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arm64: use ENDPIPROC() to annotate position independent assembler routines

For more control over which functions are called with the MMU off or
with the UEFI 1:1 mapping active, annotate some assemb

arm64: use ENDPIPROC() to annotate position independent assembler routines

For more control over which functions are called with the MMU off or
with the UEFI 1:1 mapping active, annotate some assembler routines as
position independent. This is done by introducing ENDPIPROC(), which
replaces the ENDPROC() declaration of those routines.

Signed-off-by: Ard Biesheuvel <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>

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arm64: lib: Implement optimized string compare routines

This patch, based on Linaro's Cortex Strings library, adds
an assembly optimized strcmp() and strncmp() functions.

Signed-off-by: Zhichang Yu

arm64: lib: Implement optimized string compare routines

This patch, based on Linaro's Cortex Strings library, adds
an assembly optimized strcmp() and strncmp() functions.

Signed-off-by: Zhichang Yuan <[email protected]>
Signed-off-by: Deepak Saxena <[email protected]>
Signed-off-by: Catalin Marinas <[email protected]>

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