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Message-Id: <20210722124814.778059-4-arnd@kernel.org>
Date: Thu, 22 Jul 2021 14:48:08 +0200
From: Arnd Bergmann <arnd@...nel.org>
To: linux-arch@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>,
"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
Al Viro <viro@...iv.linux.org.uk>,
Anton Ivanov <anton.ivanov@...bridgegreys.com>,
Brian Cain <bcain@...eaurora.org>,
Chris Zankel <chris@...kel.net>,
Christian Borntraeger <borntraeger@...ibm.com>,
Christoph Hellwig <hch@....de>, Guo Ren <guoren@...nel.org>,
Heiko Carstens <hca@...ux.ibm.com>,
Helge Deller <deller@....de>, Jeff Dike <jdike@...toit.com>,
Linus Walleij <linus.walleij@...aro.org>,
Max Filippov <jcmvbkbc@...il.com>,
Michal Simek <monstr@...str.eu>,
Richard Weinberger <richard@....at>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Vasily Gorbik <gor@...ux.ibm.com>,
Vineet Gupta <vgupta@...opsys.com>,
Yoshinori Sato <ysato@...rs.sourceforge.jp>,
linux-csky@...r.kernel.org, linux-hexagon@...r.kernel.org,
linux-ia64@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-mips@...r.kernel.org, linux-parisc@...r.kernel.org,
linux-s390@...r.kernel.org, linux-snps-arc@...ts.infradead.org,
linux-um@...ts.infradead.org, linux-xtensa@...ux-xtensa.org,
uclinux-h8-devel@...ts.sourceforge.jp
Subject: [PATCH v3 3/9] hexagon: use generic strncpy/strnlen from_user
From: Arnd Bergmann <arnd@...db.de>
Remove the hexagon implementation of strncpy/strnlen and instead use
the generic version. The hexagon version reads the data twice for
strncpy() by doing an extra strnlen(), and it apparently lacks a check
for user_addr_max().
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
arch/hexagon/Kconfig | 2 +
arch/hexagon/include/asm/uaccess.h | 33 +-------
arch/hexagon/kernel/hexagon_ksyms.c | 1 -
arch/hexagon/mm/Makefile | 2 +-
arch/hexagon/mm/strnlen_user.S | 126 ----------------------------
5 files changed, 5 insertions(+), 159 deletions(-)
delete mode 100644 arch/hexagon/mm/strnlen_user.S
diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig
index e5a852080730..3bf4845fed4b 100644
--- a/arch/hexagon/Kconfig
+++ b/arch/hexagon/Kconfig
@@ -19,6 +19,8 @@ config HEXAGON
# GENERIC_ALLOCATOR is used by dma_alloc_coherent()
select GENERIC_ALLOCATOR
select GENERIC_IRQ_SHOW
+ select GENERIC_STRNCPY_FROM_USER
+ select GENERIC_STRNLEN_USER
select HAVE_ARCH_KGDB
select HAVE_ARCH_TRACEHOOK
select NEED_SG_DMA_LENGTH
diff --git a/arch/hexagon/include/asm/uaccess.h b/arch/hexagon/include/asm/uaccess.h
index 59aa3a50744f..d950df12d8c5 100644
--- a/arch/hexagon/include/asm/uaccess.h
+++ b/arch/hexagon/include/asm/uaccess.h
@@ -57,42 +57,13 @@ unsigned long raw_copy_to_user(void __user *to, const void *from,
__kernel_size_t __clear_user_hexagon(void __user *dest, unsigned long count);
#define __clear_user(a, s) __clear_user_hexagon((a), (s))
-extern long __strnlen_user(const char __user *src, long n);
-
-static inline strnlen_user(const char __user *src, long n)
-{
- if (!access_ok(src, 1))
- return 0;
-
- return __strnlen_user(src, n);
-}
-/* get around the ifndef in asm-generic/uaccess.h */
+extern long strnlen_user(const char __user *src, long n);
#define strnlen_user strnlen_user
-static inline long strncpy_from_user(char *dst, const char __user *src, long n);
+extern long strncpy_from_user(char *dst, const char __user *src, long n)
#define strncpy_from_user strncpy_from_user
#include <asm-generic/uaccess.h>
-/* Todo: an actual accelerated version of this. */
-static inline long strncpy_from_user(char *dst, const char __user *src, long n)
-{
- long res = strnlen_user(src, n);
-
- if (unlikely(!res))
- return -EFAULT;
-
- if (res > n) {
- long left = raw_copy_from_user(dst, src, n);
- if (unlikely(left))
- memset(dst + (n - left), 0, left);
- return n;
- } else {
- long left = raw_copy_from_user(dst, src, res);
- if (unlikely(left))
- memset(dst + (res - left), 0, left);
- return res-1;
- }
-}
#endif
diff --git a/arch/hexagon/kernel/hexagon_ksyms.c b/arch/hexagon/kernel/hexagon_ksyms.c
index 35545a7386a0..ec56ce2d92a2 100644
--- a/arch/hexagon/kernel/hexagon_ksyms.c
+++ b/arch/hexagon/kernel/hexagon_ksyms.c
@@ -15,7 +15,6 @@ EXPORT_SYMBOL(__clear_user_hexagon);
EXPORT_SYMBOL(raw_copy_from_user);
EXPORT_SYMBOL(raw_copy_to_user);
EXPORT_SYMBOL(iounmap);
-EXPORT_SYMBOL(__strnlen_user);
EXPORT_SYMBOL(__vmgetie);
EXPORT_SYMBOL(__vmsetie);
EXPORT_SYMBOL(__vmyield);
diff --git a/arch/hexagon/mm/Makefile b/arch/hexagon/mm/Makefile
index 893838499591..49911a906fd0 100644
--- a/arch/hexagon/mm/Makefile
+++ b/arch/hexagon/mm/Makefile
@@ -4,4 +4,4 @@
#
obj-y := init.o ioremap.o uaccess.o vm_fault.o cache.o
-obj-y += copy_to_user.o copy_from_user.o strnlen_user.o vm_tlb.o
+obj-y += copy_to_user.o copy_from_user.o vm_tlb.o
diff --git a/arch/hexagon/mm/strnlen_user.S b/arch/hexagon/mm/strnlen_user.S
deleted file mode 100644
index 4b5574a7cc9c..000000000000
--- a/arch/hexagon/mm/strnlen_user.S
+++ /dev/null
@@ -1,126 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-only */
-/*
- * User string length functions for kernel
- *
- * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved.
- */
-
-#define isrc r0
-#define max r1 /* Do not change! */
-
-#define end r2
-#define tmp1 r3
-
-#define obo r6 /* off-by-one */
-#define start r7
-#define mod8 r8
-#define dbuf r15:14
-#define dcmp r13:12
-
-/*
- * The vector mask version of this turned out *really* badly.
- * The hardware loop version also turned out *really* badly.
- * Seems straight pointer arithmetic basically wins here.
- */
-
-#define fname __strnlen_user
-
- .text
- .global fname
- .type fname, @function
- .p2align 5 /* why? */
-fname:
- {
- mod8 = and(isrc,#7);
- end = add(isrc,max);
- start = isrc;
- }
- {
- P0 = cmp.eq(mod8,#0);
- mod8 = and(end,#7);
- dcmp = #0;
- if (P0.new) jump:t dw_loop; /* fire up the oven */
- }
-
-alignment_loop:
-fail_1: {
- tmp1 = memb(start++#1);
- }
- {
- P0 = cmp.eq(tmp1,#0);
- if (P0.new) jump:nt exit_found;
- P1 = cmp.gtu(end,start);
- mod8 = and(start,#7);
- }
- {
- if (!P1) jump exit_error; /* hit the end */
- P0 = cmp.eq(mod8,#0);
- }
- {
- if (!P0) jump alignment_loop;
- }
-
-
-
-dw_loop:
-fail_2: {
- dbuf = memd(start);
- obo = add(start,#1);
- }
- {
- P0 = vcmpb.eq(dbuf,dcmp);
- }
- {
- tmp1 = P0;
- P0 = cmp.gtu(end,start);
- }
- {
- tmp1 = ct0(tmp1);
- mod8 = and(end,#7);
- if (!P0) jump end_check;
- }
- {
- P0 = cmp.eq(tmp1,#32);
- if (!P0.new) jump:nt exit_found;
- if (!P0.new) start = add(obo,tmp1);
- }
- {
- start = add(start,#8);
- jump dw_loop;
- } /* might be nice to combine these jumps... */
-
-
-end_check:
- {
- P0 = cmp.gt(tmp1,mod8);
- if (P0.new) jump:nt exit_error; /* neverfound! */
- start = add(obo,tmp1);
- }
-
-exit_found:
- {
- R0 = sub(start,isrc);
- jumpr R31;
- }
-
-exit_error:
- {
- R0 = add(max,#1);
- jumpr R31;
- }
-
- /* Uh, what does the "fixup" return here? */
- .falign
-fix_1:
- {
- R0 = #0;
- jumpr R31;
- }
-
- .size fname,.-fname
-
-
-.section __ex_table,"a"
-.long fail_1,fix_1
-.long fail_2,fix_1
-.previous
--
2.29.2
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