| Message ID | 20210722124814.778059-10-arnd@kernel.org (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
| Series | asm-generic: strncpy_from_user/strnlen_user cleanup | expand |
On Thu, Jul 22, 2021 at 02:48:14PM +0200, Arnd Bergmann wrote: > From: Arnd Bergmann <arnd@arndb.de> > > Most architectures do not need a custom implementation, and in most > cases the generic implementation is preferred, so change the polariy > on these Kconfig symbols to require architectures to select them when > they provide their own version. > > The new name is CONFIG_ARCH_HAS_{STRNCPY_FROM,STRNLEN}_USER. > > The remaining architectures at the moment are: ia64, mips, parisc, > s390, um and xtensa. We should probably convert these as well, but > I was not sure how far to take this series. Looks good, Reviewed-by: Christoph Hellwig <hch@lst.de>
> > The remaining architectures at the moment are: ia64, mips, parisc, > s390, um and xtensa. We should probably convert these as well, but I'm not sure it makes sense to convert um, the implementation uses strncpy(), and that should use the libc implementation, which is tuned for the actual hardware that the binary is running on, so performance wise that might be better. OTOH, maybe this is all in the noise given the huge syscall overhead in um, so maybe unifying it would make more sense. johannes
On Thu, Jul 22, 2021 at 3:57 PM Johannes Berg <johannes@sipsolutions.net> wrote: > > > > > The remaining architectures at the moment are: ia64, mips, parisc, > > s390, um and xtensa. We should probably convert these as well, but > > I'm not sure it makes sense to convert um, the implementation uses > strncpy(), and that should use the libc implementation, which is tuned > for the actual hardware that the binary is running on, so performance > wise that might be better. > > OTOH, maybe this is all in the noise given the huge syscall overhead in > um, so maybe unifying it would make more sense. Right, makes sense. I suppose if we end up converting mips and s390, we should just do arch/um and the others as well for consistency, even if that adds some overhead. Arnd
On Thu, Jul 22, 2021 at 04:01:39PM +0200, Arnd Bergmann wrote: > On Thu, Jul 22, 2021 at 3:57 PM Johannes Berg <johannes@sipsolutions.net> wrote: > > > > > > > > The remaining architectures at the moment are: ia64, mips, parisc, > > > s390, um and xtensa. We should probably convert these as well, but > > > > I'm not sure it makes sense to convert um, the implementation uses > > strncpy(), and that should use the libc implementation, which is tuned > > for the actual hardware that the binary is running on, so performance > > wise that might be better. > > > > OTOH, maybe this is all in the noise given the huge syscall overhead in > > um, so maybe unifying it would make more sense. > > Right, makes sense. I suppose if we end up converting mips and s390, > we should just do arch/um and the others as well for consistency, even > if that adds some overhead. Feel free to add the s390 patch below on top of your series. However one question: the strncpy_from_user() prototype now comes everywhere without the __must_check attribute. Is there any reason for that? At least for s390 I want to keep that. From 03ad679909af58e1dc6864f47ce67210f0534c39 Mon Sep 17 00:00:00 2001 From: Heiko Carstens <hca@linux.ibm.com> Date: Thu, 22 Jul 2021 21:48:18 +0200 Subject: [PATCH] s390: use generic strncpy/strnlen from_user The s390 variant of strncpy_from_user() is slightly faster than the generic variant, however convert to the generic variant now to follow most if not all other architectures. Converting to the generic variant was already considered a couple of years ago. See commit f5c8b9601036 ("s390/uaccess: use sane length for __strncpy_from_user()"). Signed-off-by: Heiko Carstens <hca@linux.ibm.com> --- arch/s390/Kconfig | 2 -- arch/s390/include/asm/uaccess.h | 18 ++---------- arch/s390/lib/uaccess.c | 52 --------------------------------- 3 files changed, 2 insertions(+), 70 deletions(-) diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index f4f39087cad0..a0e2130f0100 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -75,8 +75,6 @@ config S390 select ARCH_HAS_SET_MEMORY select ARCH_HAS_STRICT_KERNEL_RWX select ARCH_HAS_STRICT_MODULE_RWX - select ARCH_HAS_STRNCPY_FROM_USER - select ARCH_HAS_STRNLEN_USER select ARCH_HAS_SYSCALL_WRAPPER select ARCH_HAS_UBSAN_SANITIZE_ALL select ARCH_HAS_VDSO_DATA diff --git a/arch/s390/include/asm/uaccess.h b/arch/s390/include/asm/uaccess.h index 2316f2440881..9ed9aa37e836 100644 --- a/arch/s390/include/asm/uaccess.h +++ b/arch/s390/include/asm/uaccess.h @@ -233,23 +233,9 @@ raw_copy_in_user(void __user *to, const void __user *from, unsigned long n); /* * Copy a null terminated string from userspace. */ +long __must_check strncpy_from_user(char *dst, const char __user *src, long count); -long __strncpy_from_user(char *dst, const char __user *src, long count); - -static inline long __must_check -strncpy_from_user(char *dst, const char __user *src, long count) -{ - might_fault(); - return __strncpy_from_user(dst, src, count); -} - -unsigned long __must_check __strnlen_user(const char __user *src, unsigned long count); - -static inline unsigned long strnlen_user(const char __user *src, unsigned long n) -{ - might_fault(); - return __strnlen_user(src, n); -} +long __must_check strnlen_user(const char __user *src, long count); /* * Zero Userspace diff --git a/arch/s390/lib/uaccess.c b/arch/s390/lib/uaccess.c index 7ec8b1fa0f08..94ca99bde59d 100644 --- a/arch/s390/lib/uaccess.c +++ b/arch/s390/lib/uaccess.c @@ -338,55 +338,3 @@ unsigned long __clear_user(void __user *to, unsigned long size) return clear_user_xc(to, size); } EXPORT_SYMBOL(__clear_user); - -static inline unsigned long strnlen_user_srst(const char __user *src, - unsigned long size) -{ - unsigned long tmp1, tmp2; - - asm volatile( - " lghi 0,0\n" - " la %2,0(%1)\n" - " la %3,0(%0,%1)\n" - " slgr %0,%0\n" - " sacf 256\n" - "0: srst %3,%2\n" - " jo 0b\n" - " la %0,1(%3)\n" /* strnlen_user results includes \0 */ - " slgr %0,%1\n" - "1: sacf 768\n" - EX_TABLE(0b,1b) - : "+a" (size), "+a" (src), "=a" (tmp1), "=a" (tmp2) - : - : "cc", "memory", "0"); - return size; -} - -unsigned long __strnlen_user(const char __user *src, unsigned long size) -{ - if (unlikely(!size)) - return 0; - return strnlen_user_srst(src, size); -} -EXPORT_SYMBOL(__strnlen_user); - -long __strncpy_from_user(char *dst, const char __user *src, long size) -{ - size_t done, len, offset, len_str; - - if (unlikely(size <= 0)) - return 0; - done = 0; - do { - offset = (size_t)src & (L1_CACHE_BYTES - 1); - len = min(size - done, L1_CACHE_BYTES - offset); - if (copy_from_user(dst, src, len)) - return -EFAULT; - len_str = strnlen(dst, len); - done += len_str; - src += len_str; - dst += len_str; - } while ((len_str == len) && (done < size)); - return done; -} -EXPORT_SYMBOL(__strncpy_from_user);
On Thu, Jul 22, 2021 at 10:07 PM Heiko Carstens <hca@linux.ibm.com> wrote: > > Feel free to add the s390 patch below on top of your series. Thanks a lot, added now. > However one question: the strncpy_from_user() prototype now comes everywhere > without the __must_check attribute. Is there any reason for that? > > At least for s390 I want to keep that. Makes sense, I'll add a patch for that as well. Arnd
On Thu, Jul 22, 2021 at 2:50 PM Arnd Bergmann <arnd@kernel.org> wrote: > From: Arnd Bergmann <arnd@arndb.de> > > Most architectures do not need a custom implementation, and in most > cases the generic implementation is preferred, so change the polariy > on these Kconfig symbols to require architectures to select them when > they provide their own version. > > The new name is CONFIG_ARCH_HAS_{STRNCPY_FROM,STRNLEN}_USER. > > The remaining architectures at the moment are: ia64, mips, parisc, > s390, um and xtensa. We should probably convert these as well, but > I was not sure how far to take this series. > > Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> > Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> > Cc: Christian Borntraeger <borntraeger@de.ibm.com> > Cc: Heiko Carstens <hca@linux.ibm.com> > Cc: Helge Deller <deller@gmx.de> > Cc: Jeff Dike <jdike@addtoit.com> > Cc: Max Filippov <jcmvbkbc@gmail.com> > Cc: Richard Weinberger <richard@nod.at> > Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> > Cc: Vasily Gorbik <gor@linux.ibm.com> > Cc: linux-ia64@vger.kernel.org > Cc: linux-mips@vger.kernel.org > Cc: linux-parisc@vger.kernel.org > Cc: linux-s390@vger.kernel.org > Cc: linux-um@lists.infradead.org > Cc: linux-xtensa@linux-xtensa.org > Signed-off-by: Arnd Bergmann <arnd@arndb.de> > arch/m68k/Kconfig | 2 -- Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Gr{oetje,eeting}s, Geert
On 7/22/21 2:48 PM, Arnd Bergmann wrote: > From: Arnd Bergmann <arnd@arndb.de> > > Most architectures do not need a custom implementation, and in most > cases the generic implementation is preferred, so change the polariy > on these Kconfig symbols to require architectures to select them when > they provide their own version. > > The new name is CONFIG_ARCH_HAS_{STRNCPY_FROM,STRNLEN}_USER. > > The remaining architectures at the moment are: ia64, mips, parisc, > s390, um and xtensa. We should probably convert these as well, but > I was not sure how far to take this series. Acked-by: Helge Deller <deller@gmx.de> # parisc Thanks! Helge
diff --git a/arch/alpha/Kconfig b/arch/alpha/Kconfig index 77d3280dc678..62935da8e69e 100644 --- a/arch/alpha/Kconfig +++ b/arch/alpha/Kconfig @@ -29,8 +29,6 @@ config ALPHA select AUDIT_ARCH select GENERIC_CPU_VULNERABILITIES select GENERIC_SMP_IDLE_THREAD - select GENERIC_STRNCPY_FROM_USER - select GENERIC_STRNLEN_USER select HAVE_ARCH_AUDITSYSCALL select HAVE_MOD_ARCH_SPECIFIC select MODULES_USE_ELF_RELA diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index 64e5f9366401..d8f51eb8963b 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -27,8 +27,6 @@ config ARC select GENERIC_PENDING_IRQ if SMP select GENERIC_SCHED_CLOCK select GENERIC_SMP_IDLE_THREAD - select GENERIC_STRNCPY_FROM_USER - select GENERIC_STRNLEN_USER select HAVE_ARCH_KGDB select HAVE_ARCH_TRACEHOOK select HAVE_ARCH_TRANSPARENT_HUGEPAGE if ARC_MMU_V4 diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 82f908fa5676..e8ebbb9ededf 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -63,8 +63,6 @@ config ARM select GENERIC_PCI_IOMAP select GENERIC_SCHED_CLOCK select GENERIC_SMP_IDLE_THREAD - select GENERIC_STRNCPY_FROM_USER - select GENERIC_STRNLEN_USER select HANDLE_DOMAIN_IRQ select HARDIRQS_SW_RESEND select HAVE_ARCH_AUDITSYSCALL if AEABI && !OABI_COMPAT diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index b5b13a932561..e0c6c14a21d0 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -130,8 +130,6 @@ config ARM64 select GENERIC_PTDUMP select GENERIC_SCHED_CLOCK select GENERIC_SMP_IDLE_THREAD - select GENERIC_STRNCPY_FROM_USER - select GENERIC_STRNLEN_USER select GENERIC_TIME_VSYSCALL select GENERIC_GETTIMEOFDAY select GENERIC_VDSO_TIME_NS diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig index 5043e221ced4..2716f6395ba7 100644 --- a/arch/csky/Kconfig +++ b/arch/csky/Kconfig @@ -35,8 +35,6 @@ config CSKY select GENERIC_IRQ_MULTI_HANDLER select GENERIC_SCHED_CLOCK select GENERIC_SMP_IDLE_THREAD - select GENERIC_STRNCPY_FROM_USER - select GENERIC_STRNLEN_USER select GENERIC_TIME_VSYSCALL select GENERIC_VDSO_32 select GENERIC_GETTIMEOFDAY diff --git a/arch/h8300/Kconfig b/arch/h8300/Kconfig index 53dfd2d47e0e..3e3e0f16f7e0 100644 --- a/arch/h8300/Kconfig +++ b/arch/h8300/Kconfig @@ -11,8 +11,6 @@ config H8300 select GENERIC_IRQ_SHOW select FRAME_POINTER select GENERIC_CPU_DEVICES - select GENERIC_STRNCPY_FROM_USER - select GENERIC_STRNLEN_USER select MODULES_USE_ELF_RELA select COMMON_CLK select ARCH_WANT_FRAME_POINTERS diff --git a/arch/hexagon/Kconfig b/arch/hexagon/Kconfig index 3bf4845fed4b..e5a852080730 100644 --- a/arch/hexagon/Kconfig +++ b/arch/hexagon/Kconfig @@ -19,8 +19,6 @@ 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/ia64/Kconfig b/arch/ia64/Kconfig index cf425c2c63af..7aa5b94464c6 100644 --- a/arch/ia64/Kconfig +++ b/arch/ia64/Kconfig @@ -9,6 +9,8 @@ menu "Processor type and features" config IA64 bool select ARCH_HAS_DMA_MARK_CLEAN + select ARCH_HAS_STRNCPY_FROM_USER + select ARCH_HAS_STRNLEN_USER select ARCH_MIGHT_HAVE_PC_PARPORT select ARCH_MIGHT_HAVE_PC_SERIO select ACPI diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig index 37a65bed6dfa..7970d316dc9b 100644 --- a/arch/m68k/Kconfig +++ b/arch/m68k/Kconfig @@ -16,8 +16,6 @@ config M68K select GENERIC_CPU_DEVICES select GENERIC_IOMAP select GENERIC_IRQ_SHOW - select GENERIC_STRNCPY_FROM_USER - select GENERIC_STRNLEN_USER select HAVE_AOUT if MMU select HAVE_ASM_MODVERSIONS select HAVE_DEBUG_BUGVERBOSE diff --git a/arch/microblaze/Kconfig b/arch/microblaze/Kconfig index 10dfa7b4feff..14a67a42fcae 100644 --- a/arch/microblaze/Kconfig +++ b/arch/microblaze/Kconfig @@ -21,8 +21,6 @@ config MICROBLAZE select GENERIC_IRQ_SHOW select GENERIC_PCI_IOMAP select GENERIC_SCHED_CLOCK - select GENERIC_STRNCPY_FROM_USER - select GENERIC_STRNLEN_USER select HAVE_ARCH_HASH select HAVE_ARCH_KGDB select HAVE_ARCH_SECCOMP diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig index cee6087cd686..22aa4d75fa34 100644 --- a/arch/mips/Kconfig +++ b/arch/mips/Kconfig @@ -12,6 +12,8 @@ config MIPS select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_HAS_UBSAN_SANITIZE_ALL select ARCH_HAS_GCOV_PROFILE_ALL + select ARCH_HAS_STRNCPY_FROM_USER + select ARCH_HAS_STRNLEN_USER select ARCH_KEEP_MEMBLOCK select ARCH_SUPPORTS_UPROBES select ARCH_USE_BUILTIN_BSWAP diff --git a/arch/nds32/Kconfig b/arch/nds32/Kconfig index 62313902d75d..9c9f3877abf9 100644 --- a/arch/nds32/Kconfig +++ b/arch/nds32/Kconfig @@ -26,8 +26,6 @@ config NDS32 select GENERIC_LIB_LSHRDI3 select GENERIC_LIB_MULDI3 select GENERIC_LIB_UCMPDI2 - select GENERIC_STRNCPY_FROM_USER - select GENERIC_STRNLEN_USER select GENERIC_TIME_VSYSCALL select HANDLE_DOMAIN_IRQ select HAVE_ARCH_TRACEHOOK diff --git a/arch/nios2/Kconfig b/arch/nios2/Kconfig index c24955c81c92..3efe5533ea1c 100644 --- a/arch/nios2/Kconfig +++ b/arch/nios2/Kconfig @@ -13,8 +13,6 @@ config NIOS2 select GENERIC_CPU_DEVICES select GENERIC_IRQ_PROBE select GENERIC_IRQ_SHOW - select GENERIC_STRNCPY_FROM_USER - select GENERIC_STRNLEN_USER select HAVE_ARCH_TRACEHOOK select HAVE_ARCH_KGDB select IRQ_DOMAIN diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig index 591acc5990dc..50035a9816c8 100644 --- a/arch/openrisc/Kconfig +++ b/arch/openrisc/Kconfig @@ -25,8 +25,6 @@ config OPENRISC select HAVE_UID16 select GENERIC_ATOMIC64 select GENERIC_CLOCKEVENTS_BROADCAST - select GENERIC_STRNCPY_FROM_USER - select GENERIC_STRNLEN_USER select GENERIC_SMP_IDLE_THREAD select MODULES_USE_ELF_RELA select HAVE_DEBUG_STACKOVERFLOW diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig index bde9907bc5b2..727c823f866e 100644 --- a/arch/parisc/Kconfig +++ b/arch/parisc/Kconfig @@ -11,6 +11,7 @@ config PARISC select ARCH_HAS_ELF_RANDOMIZE select ARCH_HAS_STRICT_KERNEL_RWX select ARCH_HAS_UBSAN_SANITIZE_ALL + select ARCH_HAS_STRNLEN_USER select ARCH_NO_SG_CHAIN select ARCH_SUPPORTS_HUGETLBFS if PA20 select ARCH_SUPPORTS_MEMORY_FAILURE @@ -34,7 +35,6 @@ config PARISC select ARCH_HAVE_NMI_SAFE_CMPXCHG select GENERIC_SMP_IDLE_THREAD select GENERIC_CPU_DEVICES - select GENERIC_STRNCPY_FROM_USER select GENERIC_LIB_DEVMEM_IS_ALLOWED select SYSCTL_ARCH_UNALIGN_ALLOW select SYSCTL_EXCEPTION_TRACE diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index d01e3401581d..d2df3d2db3eb 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -183,8 +183,6 @@ config PPC select GENERIC_IRQ_SHOW_LEVEL select GENERIC_PCI_IOMAP if PCI select GENERIC_SMP_IDLE_THREAD - select GENERIC_STRNCPY_FROM_USER - select GENERIC_STRNLEN_USER select GENERIC_TIME_VSYSCALL select GENERIC_VDSO_TIME_NS select HAVE_ARCH_AUDITSYSCALL diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 47bbbcab91b2..49d642df6ab9 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -56,8 +56,6 @@ config RISCV select GENERIC_PTDUMP if MMU select GENERIC_SCHED_CLOCK select GENERIC_SMP_IDLE_THREAD - select GENERIC_STRNCPY_FROM_USER - select GENERIC_STRNLEN_USER select GENERIC_TIME_VSYSCALL if MMU && 64BIT select HANDLE_DOMAIN_IRQ select HAVE_ARCH_AUDITSYSCALL diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index a0e2130f0100..f4f39087cad0 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -75,6 +75,8 @@ config S390 select ARCH_HAS_SET_MEMORY select ARCH_HAS_STRICT_KERNEL_RWX select ARCH_HAS_STRICT_MODULE_RWX + select ARCH_HAS_STRNCPY_FROM_USER + select ARCH_HAS_STRNLEN_USER select ARCH_HAS_SYSCALL_WRAPPER select ARCH_HAS_UBSAN_SANITIZE_ALL select ARCH_HAS_VDSO_DATA diff --git a/arch/sh/Kconfig b/arch/sh/Kconfig index 45a0549421cd..5d20509e5556 100644 --- a/arch/sh/Kconfig +++ b/arch/sh/Kconfig @@ -22,8 +22,6 @@ config SUPERH select GENERIC_IRQ_SHOW select GENERIC_PCI_IOMAP if PCI select GENERIC_SCHED_CLOCK - select GENERIC_STRNCPY_FROM_USER - select GENERIC_STRNLEN_USER select GENERIC_SMP_IDLE_THREAD select GUP_GET_PTE_LOW_HIGH if X2TLB select HAVE_ARCH_AUDITSYSCALL diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index c5fa7932b550..9f78822562eb 100644 --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -38,8 +38,6 @@ config SPARC select HAVE_EBPF_JIT if SPARC64 select HAVE_DEBUG_BUGVERBOSE select GENERIC_SMP_IDLE_THREAD - select GENERIC_STRNCPY_FROM_USER - select GENERIC_STRNLEN_USER select MODULES_USE_ELF_RELA select PCI_SYSCALL if PCI select PCI_MSI_ARCH_FALLBACKS if PCI_MSI diff --git a/arch/um/Kconfig b/arch/um/Kconfig index 0561b73cfd9a..77e66d3719f6 100644 --- a/arch/um/Kconfig +++ b/arch/um/Kconfig @@ -7,6 +7,8 @@ config UML default y select ARCH_EPHEMERAL_INODES select ARCH_HAS_KCOV + select ARCH_HAS_STRNCPY_FROM_USER + select ARCH_HAS_STRNLEN_USER select ARCH_NO_PREEMPT select HAVE_ARCH_AUDITSYSCALL select HAVE_ARCH_SECCOMP_FILTER diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 49270655e827..5509c828bc93 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -144,8 +144,6 @@ config X86 select GENERIC_PENDING_IRQ if SMP select GENERIC_PTDUMP select GENERIC_SMP_IDLE_THREAD - select GENERIC_STRNCPY_FROM_USER - select GENERIC_STRNLEN_USER select GENERIC_TIME_VSYSCALL select GENERIC_GETTIMEOFDAY select GENERIC_VDSO_TIME_NS diff --git a/arch/xtensa/Kconfig b/arch/xtensa/Kconfig index 2332b2156993..282fc195680e 100644 --- a/arch/xtensa/Kconfig +++ b/arch/xtensa/Kconfig @@ -7,6 +7,8 @@ config XTENSA select ARCH_HAS_SYNC_DMA_FOR_CPU if MMU select ARCH_HAS_SYNC_DMA_FOR_DEVICE if MMU select ARCH_HAS_DMA_SET_UNCACHED if MMU + select ARCH_HAS_STRNCPY_FROM_USER if !KASAN + select ARCH_HAS_STRNLEN_USER select ARCH_USE_MEMTEST select ARCH_USE_QUEUED_RWLOCKS select ARCH_USE_QUEUED_SPINLOCKS @@ -20,7 +22,6 @@ config XTENSA select GENERIC_IRQ_SHOW select GENERIC_PCI_IOMAP select GENERIC_SCHED_CLOCK - select GENERIC_STRNCPY_FROM_USER if KASAN select HAVE_ARCH_AUDITSYSCALL select HAVE_ARCH_JUMP_LABEL if !XIP_KERNEL select HAVE_ARCH_KASAN if MMU && !XIP_KERNEL diff --git a/arch/xtensa/include/asm/uaccess.h b/arch/xtensa/include/asm/uaccess.h index 5c9fb8005aa8..250ee68e9d82 100644 --- a/arch/xtensa/include/asm/uaccess.h +++ b/arch/xtensa/include/asm/uaccess.h @@ -290,8 +290,7 @@ clear_user(void __user *addr, unsigned long size) #define __clear_user __xtensa_clear_user -#ifndef CONFIG_GENERIC_STRNCPY_FROM_USER - +#ifdef CONFIG_HAS_STRNCPY_FROM_USER extern long __strncpy_user(char *dst, const char __user *src, long count); static inline long diff --git a/lib/Kconfig b/lib/Kconfig index d241fe476fda..0e66c9fa636b 100644 --- a/lib/Kconfig +++ b/lib/Kconfig @@ -50,12 +50,18 @@ config HAVE_ARCH_BITREVERSE This option enables the use of hardware bit-reversal instructions on architectures which support such operations. -config GENERIC_STRNCPY_FROM_USER +config ARCH_HAS_STRNCPY_FROM_USER bool -config GENERIC_STRNLEN_USER +config ARCH_HAS_STRNLEN_USER bool +config GENERIC_STRNCPY_FROM_USER + def_bool !ARCH_HAS_STRNCPY_FROM_USER + +config GENERIC_STRNLEN_USER + def_bool !ARCH_HAS_STRNLEN_USER + config GENERIC_NET_UTILS bool