From: Arnd Bergmann <arnd@kernel.org>
To: Linus Torvalds <torvalds@linux-foundation.org>,
Christoph Hellwig <hch@lst.de>,
linux-arch@vger.kernel.org, linux-mm@kvack.org,
linux-api@vger.kernel.org, arnd@arndb.de,
linux-kernel@vger.kernel.org
Cc: mark.rutland@arm.com, dalias@libc.org,
linux-ia64@vger.kernel.org, linux-sh@vger.kernel.org,
peterz@infradead.org, jcmvbkbc@gmail.com, guoren@kernel.org,
sparclinux@vger.kernel.org, linux-hexagon@vger.kernel.org,
linux-riscv@lists.infradead.org, will@kernel.org,
ardb@kernel.org, linux-s390@vger.kernel.org,
bcain@codeaurora.org, deller@gmx.de, x86@kernel.org,
linux@armlinux.org.uk, linux-csky@vger.kernel.org,
mingo@redhat.com, geert@linux-m68k.org,
linux-snps-arc@lists.infradead.org,
linux-xtensa@linux-xtensa.org, hca@linux.ibm.com,
linux-alpha@vger.kernel.org, linux-um@lists.infradead.org,
linux-m68k@lists.linux-m68k.org, openrisc@lists.librecores.org,
green.hu@gmail.com, shorne@gmail.com,
linux-arm-kernel@lists.infradead.org, monstr@monstr.eu,
tsbogend@alpha.franken.de, linux-parisc@vger.kernel.org,
nickhu@andestech.com, linux-mips@vger.kernel.org,
dinguyen@kernel.org, ebiederm@xmission.com, richard@nod.at,
akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org,
davem@davemloft.net
Subject: [PATCH 05/14] uaccess: add generic __{get,put}_kernel_nofault
Date: Mon, 14 Feb 2022 17:34:43 +0100 [thread overview]
Message-ID: <20220214163452.1568807-6-arnd@kernel.org> (raw)
In-Reply-To: <20220214163452.1568807-1-arnd@kernel.org>
From: Arnd Bergmann <arnd@arndb.de>
All architectures that don't provide __{get,put}_kernel_nofault() yet
can implement this on top of __{get,put}_user.
Add a generic version that lets everything use the normal
copy_{from,to}_kernel_nofault() code based on these, removing the last
use of get_fs()/set_fs() from architecture-independent code.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
arch/arm/include/asm/uaccess.h | 2 -
arch/arm64/include/asm/uaccess.h | 2 -
arch/m68k/include/asm/uaccess.h | 2 -
arch/mips/include/asm/uaccess.h | 2 -
arch/parisc/include/asm/uaccess.h | 1 -
arch/powerpc/include/asm/uaccess.h | 2 -
arch/riscv/include/asm/uaccess.h | 2 -
arch/s390/include/asm/uaccess.h | 2 -
arch/sparc/include/asm/uaccess_64.h | 2 -
arch/um/include/asm/uaccess.h | 2 -
arch/x86/include/asm/uaccess.h | 2 -
include/asm-generic/uaccess.h | 2 -
include/linux/uaccess.h | 19 +++++
mm/maccess.c | 108 ----------------------------
14 files changed, 19 insertions(+), 131 deletions(-)
diff --git a/arch/arm/include/asm/uaccess.h b/arch/arm/include/asm/uaccess.h
index 32dbfd81f42a..d20d78c34b94 100644
--- a/arch/arm/include/asm/uaccess.h
+++ b/arch/arm/include/asm/uaccess.h
@@ -476,8 +476,6 @@ do { \
: "r" (x), "i" (-EFAULT) \
: "cc")
-#define HAVE_GET_KERNEL_NOFAULT
-
#define __get_kernel_nofault(dst, src, type, err_label) \
do { \
const type *__pk_ptr = (src); \
diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h
index 3a5ff5e20586..2e20879fe3cf 100644
--- a/arch/arm64/include/asm/uaccess.h
+++ b/arch/arm64/include/asm/uaccess.h
@@ -26,8 +26,6 @@
#include <asm/memory.h>
#include <asm/extable.h>
-#define HAVE_GET_KERNEL_NOFAULT
-
/*
* Test whether a block of memory is a valid user space address.
* Returns 1 if the range is valid, 0 otherwise.
diff --git a/arch/m68k/include/asm/uaccess.h b/arch/m68k/include/asm/uaccess.h
index ba670523885c..79617c0b2f91 100644
--- a/arch/m68k/include/asm/uaccess.h
+++ b/arch/m68k/include/asm/uaccess.h
@@ -390,8 +390,6 @@ raw_copy_to_user(void __user *to, const void *from, unsigned long n)
#define INLINE_COPY_FROM_USER
#define INLINE_COPY_TO_USER
-#define HAVE_GET_KERNEL_NOFAULT
-
#define __get_kernel_nofault(dst, src, type, err_label) \
do { \
type *__gk_dst = (type *)(dst); \
diff --git a/arch/mips/include/asm/uaccess.h b/arch/mips/include/asm/uaccess.h
index f8f74f9f5883..db9a8e002b62 100644
--- a/arch/mips/include/asm/uaccess.h
+++ b/arch/mips/include/asm/uaccess.h
@@ -296,8 +296,6 @@ struct __large_struct { unsigned long buf[100]; };
(val) = __gu_tmp.t; \
}
-#define HAVE_GET_KERNEL_NOFAULT
-
#define __get_kernel_nofault(dst, src, type, err_label) \
do { \
int __gu_err; \
diff --git a/arch/parisc/include/asm/uaccess.h b/arch/parisc/include/asm/uaccess.h
index ebf8a845b017..0925bbd6db67 100644
--- a/arch/parisc/include/asm/uaccess.h
+++ b/arch/parisc/include/asm/uaccess.h
@@ -95,7 +95,6 @@ struct exception_table_entry {
(val) = (__force __typeof__(*(ptr))) __gu_val; \
}
-#define HAVE_GET_KERNEL_NOFAULT
#define __get_kernel_nofault(dst, src, type, err_label) \
{ \
type __z; \
diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index 63316100080c..a0032c2e7550 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -467,8 +467,6 @@ do { \
unsafe_put_user(*(u8*)(_src + _i), (u8 __user *)(_dst + _i), e); \
} while (0)
-#define HAVE_GET_KERNEL_NOFAULT
-
#define __get_kernel_nofault(dst, src, type, err_label) \
__get_user_size_goto(*((type *)(dst)), \
(__force type __user *)(src), sizeof(type), err_label)
diff --git a/arch/riscv/include/asm/uaccess.h b/arch/riscv/include/asm/uaccess.h
index c701a5e57a2b..4407b9e48d2c 100644
--- a/arch/riscv/include/asm/uaccess.h
+++ b/arch/riscv/include/asm/uaccess.h
@@ -346,8 +346,6 @@ unsigned long __must_check clear_user(void __user *to, unsigned long n)
__clear_user(to, n) : n;
}
-#define HAVE_GET_KERNEL_NOFAULT
-
#define __get_kernel_nofault(dst, src, type, err_label) \
do { \
long __kr_err; \
diff --git a/arch/s390/include/asm/uaccess.h b/arch/s390/include/asm/uaccess.h
index d74e26b48604..29332edf46f0 100644
--- a/arch/s390/include/asm/uaccess.h
+++ b/arch/s390/include/asm/uaccess.h
@@ -282,8 +282,6 @@ static inline unsigned long __must_check clear_user(void __user *to, unsigned lo
int copy_to_user_real(void __user *dest, void *src, unsigned long count);
void *s390_kernel_write(void *dst, const void *src, size_t size);
-#define HAVE_GET_KERNEL_NOFAULT
-
int __noreturn __put_kernel_bad(void);
#define __put_kernel_asm(val, to, insn) \
diff --git a/arch/sparc/include/asm/uaccess_64.h b/arch/sparc/include/asm/uaccess_64.h
index b283798315b1..5c12fb46bc61 100644
--- a/arch/sparc/include/asm/uaccess_64.h
+++ b/arch/sparc/include/asm/uaccess_64.h
@@ -210,8 +210,6 @@ __asm__ __volatile__( \
: "=r" (ret), "=r" (x) : "r" (__m(addr)), \
"i" (-EFAULT))
-#define HAVE_GET_KERNEL_NOFAULT
-
#define __get_user_nocheck(data, addr, size, type) ({ \
register int __gu_ret; \
register unsigned long __gu_val; \
diff --git a/arch/um/include/asm/uaccess.h b/arch/um/include/asm/uaccess.h
index 17d18cfd82a5..1ecfc96bcc50 100644
--- a/arch/um/include/asm/uaccess.h
+++ b/arch/um/include/asm/uaccess.h
@@ -44,8 +44,6 @@ static inline int __access_ok(unsigned long addr, unsigned long size)
}
/* no pagefaults for kernel addresses in um */
-#define HAVE_GET_KERNEL_NOFAULT 1
-
#define __get_kernel_nofault(dst, src, type, err_label) \
do { \
*((type *)dst) = get_unaligned((type *)(src)); \
diff --git a/arch/x86/include/asm/uaccess.h b/arch/x86/include/asm/uaccess.h
index 6956a63291b6..c6d9dc42724d 100644
--- a/arch/x86/include/asm/uaccess.h
+++ b/arch/x86/include/asm/uaccess.h
@@ -510,8 +510,6 @@ do { \
unsafe_copy_loop(__ucu_dst, __ucu_src, __ucu_len, u8, label); \
} while (0)
-#define HAVE_GET_KERNEL_NOFAULT
-
#ifdef CONFIG_CC_HAS_ASM_GOTO_OUTPUT
#define __get_kernel_nofault(dst, src, type, err_label) \
__get_user_size(*((type *)(dst)), (__force type __user *)(src), \
diff --git a/include/asm-generic/uaccess.h b/include/asm-generic/uaccess.h
index 10ffa8b5c117..0870fa11a7c5 100644
--- a/include/asm-generic/uaccess.h
+++ b/include/asm-generic/uaccess.h
@@ -77,8 +77,6 @@ do { \
goto err_label; \
} while (0)
-#define HAVE_GET_KERNEL_NOFAULT 1
-
static inline __must_check unsigned long
raw_copy_from_user(void *to, const void __user * from, unsigned long n)
{
diff --git a/include/linux/uaccess.h b/include/linux/uaccess.h
index ac0394087f7d..67e9bc94dc40 100644
--- a/include/linux/uaccess.h
+++ b/include/linux/uaccess.h
@@ -368,6 +368,25 @@ long strncpy_from_user_nofault(char *dst, const void __user *unsafe_addr,
long count);
long strnlen_user_nofault(const void __user *unsafe_addr, long count);
+#ifndef __get_kernel_nofault
+#define __get_kernel_nofault(dst, src, type, label) \
+do { \
+ type __user *p = (type __force __user *)(src); \
+ type data; \
+ if (__get_user(data, p)) \
+ goto label; \
+ *(type *)dst = data; \
+} while (0)
+
+#define __put_kernel_nofault(dst, src, type, label) \
+do { \
+ type __user *p = (type __force __user *)(dst); \
+ type data = *(type *)src; \
+ if (__put_user(data, p)) \
+ goto label; \
+} while (0)
+#endif
+
/**
* get_kernel_nofault(): safely attempt to read from a location
* @val: read into this variable
diff --git a/mm/maccess.c b/mm/maccess.c
index d3f1a1f0b1c1..cbd1b3959af2 100644
--- a/mm/maccess.c
+++ b/mm/maccess.c
@@ -12,8 +12,6 @@ bool __weak copy_from_kernel_nofault_allowed(const void *unsafe_src,
return true;
}
-#ifdef HAVE_GET_KERNEL_NOFAULT
-
#define copy_from_kernel_nofault_loop(dst, src, len, type, err_label) \
while (len >= sizeof(type)) { \
__get_kernel_nofault(dst, src, type, err_label); \
@@ -102,112 +100,6 @@ long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr, long count)
dst[-1] = '\0';
return -EFAULT;
}
-#else /* HAVE_GET_KERNEL_NOFAULT */
-/**
- * copy_from_kernel_nofault(): safely attempt to read from kernel-space
- * @dst: pointer to the buffer that shall take the data
- * @src: address to read from
- * @size: size of the data chunk
- *
- * Safely read from kernel address @src to the buffer at @dst. If a kernel
- * fault happens, handle that and return -EFAULT. If @src is not a valid kernel
- * address, return -ERANGE.
- *
- * We ensure that the copy_from_user is executed in atomic context so that
- * do_page_fault() doesn't attempt to take mmap_lock. This makes
- * copy_from_kernel_nofault() suitable for use within regions where the caller
- * already holds mmap_lock, or other locks which nest inside mmap_lock.
- */
-long copy_from_kernel_nofault(void *dst, const void *src, size_t size)
-{
- long ret;
- mm_segment_t old_fs = get_fs();
-
- if (!copy_from_kernel_nofault_allowed(src, size))
- return -ERANGE;
-
- set_fs(KERNEL_DS);
- pagefault_disable();
- ret = __copy_from_user_inatomic(dst, (__force const void __user *)src,
- size);
- pagefault_enable();
- set_fs(old_fs);
-
- if (ret)
- return -EFAULT;
- return 0;
-}
-EXPORT_SYMBOL_GPL(copy_from_kernel_nofault);
-
-/**
- * copy_to_kernel_nofault(): safely attempt to write to a location
- * @dst: address to write to
- * @src: pointer to the data that shall be written
- * @size: size of the data chunk
- *
- * Safely write to address @dst from the buffer at @src. If a kernel fault
- * happens, handle that and return -EFAULT.
- */
-long copy_to_kernel_nofault(void *dst, const void *src, size_t size)
-{
- long ret;
- mm_segment_t old_fs = get_fs();
-
- set_fs(KERNEL_DS);
- pagefault_disable();
- ret = __copy_to_user_inatomic((__force void __user *)dst, src, size);
- pagefault_enable();
- set_fs(old_fs);
-
- if (ret)
- return -EFAULT;
- return 0;
-}
-
-/**
- * strncpy_from_kernel_nofault: - Copy a NUL terminated string from unsafe
- * address.
- * @dst: Destination address, in kernel space. This buffer must be at
- * least @count bytes long.
- * @unsafe_addr: Unsafe address.
- * @count: Maximum number of bytes to copy, including the trailing NUL.
- *
- * Copies a NUL-terminated string from unsafe address to kernel buffer.
- *
- * On success, returns the length of the string INCLUDING the trailing NUL.
- *
- * If access fails, returns -EFAULT (some data may have been copied and the
- * trailing NUL added). If @unsafe_addr is not a valid kernel address, return
- * -ERANGE.
- *
- * If @count is smaller than the length of the string, copies @count-1 bytes,
- * sets the last byte of @dst buffer to NUL and returns @count.
- */
-long strncpy_from_kernel_nofault(char *dst, const void *unsafe_addr, long count)
-{
- mm_segment_t old_fs = get_fs();
- const void *src = unsafe_addr;
- long ret;
-
- if (unlikely(count <= 0))
- return 0;
- if (!copy_from_kernel_nofault_allowed(unsafe_addr, count))
- return -ERANGE;
-
- set_fs(KERNEL_DS);
- pagefault_disable();
-
- do {
- ret = __get_user(*dst++, (const char __user __force *)src++);
- } while (dst[-1] && ret == 0 && src - unsafe_addr < count);
-
- dst[-1] = '\0';
- pagefault_enable();
- set_fs(old_fs);
-
- return ret ? -EFAULT : src - unsafe_addr;
-}
-#endif /* HAVE_GET_KERNEL_NOFAULT */
/**
* copy_from_user_nofault(): safely attempt to read from a user-space location
--
2.29.2
next prev parent reply other threads:[~2022-02-14 16:39 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-14 16:34 [PATCH 00/14] clean up asm/uaccess.h, kill set_fs for good Arnd Bergmann
2022-02-14 16:34 ` [PATCH 01/14] uaccess: fix integer overflow on access_ok() Arnd Bergmann
2022-02-14 16:58 ` Christoph Hellwig
2022-02-14 16:34 ` [PATCH 02/14] sparc64: add __{get,put}_kernel_nocheck() Arnd Bergmann
2022-02-14 16:34 ` [PATCH 03/14] nds32: fix access_ok() checks in get/put_user Arnd Bergmann
2022-02-14 17:01 ` Christoph Hellwig
2022-02-14 17:10 ` David Laight
2022-02-15 9:18 ` Arnd Bergmann
2022-02-15 10:25 ` Greg KH
2022-02-14 16:34 ` [PATCH 04/14] x86: use more conventional access_ok() definition Arnd Bergmann
2022-02-14 17:02 ` Christoph Hellwig
2022-02-14 19:45 ` Arnd Bergmann
2022-02-14 20:00 ` Christoph Hellwig
2022-02-14 20:01 ` Linus Torvalds
2022-02-14 20:17 ` Al Viro
2022-02-15 2:47 ` Al Viro
2022-02-14 20:24 ` Linus Torvalds
2022-02-14 22:13 ` David Laight
2022-02-14 16:34 ` Arnd Bergmann [this message]
2022-02-14 17:02 ` [PATCH 05/14] uaccess: add generic __{get,put}_kernel_nofault Christoph Hellwig
2022-02-15 0:31 ` Al Viro
2022-02-15 13:16 ` Arnd Bergmann
2022-02-14 16:34 ` [PATCH 06/14] mips: use simpler access_ok() Arnd Bergmann
2022-02-14 16:34 ` [PATCH 07/14] uaccess: generalize access_ok() Arnd Bergmann
2022-02-14 17:04 ` Christoph Hellwig
2022-02-14 17:15 ` Al Viro
2022-02-14 19:25 ` Arnd Bergmann
2022-02-15 10:58 ` Mark Rutland
2022-02-14 16:34 ` [PATCH 08/14] arm64: simplify access_ok() Arnd Bergmann
2022-02-14 21:06 ` Robin Murphy
2022-02-15 8:17 ` Ard Biesheuvel
2022-02-15 9:12 ` Arnd Bergmann
2022-02-15 9:21 ` Ard Biesheuvel
2022-02-15 9:39 ` Arnd Bergmann
2022-02-15 10:39 ` Mark Rutland
2022-02-15 10:37 ` Mark Rutland
2022-02-16 19:43 ` Christophe Leroy
2022-02-15 9:30 ` David Laight
2022-02-15 11:24 ` Mark Rutland
2022-02-15 11:07 ` Mark Rutland
2022-02-14 16:34 ` [PATCH 09/14] m68k: drop custom __access_ok() Arnd Bergmann
2022-02-15 0:37 ` Al Viro
2022-02-15 6:29 ` Christoph Hellwig
2022-02-15 7:13 ` Al Viro
2022-02-15 10:02 ` Arnd Bergmann
2022-02-15 13:28 ` David Laight
2022-02-14 16:34 ` [PATCH 10/14] uaccess: remove most CONFIG_SET_FS users Arnd Bergmann
2022-02-14 17:06 ` Christoph Hellwig
2022-02-14 19:40 ` Arnd Bergmann
2022-02-14 16:34 ` [PATCH 11/14] sparc64: remove CONFIG_SET_FS support Arnd Bergmann
2022-02-14 17:06 ` Christoph Hellwig
2022-02-16 13:06 ` Arnd Bergmann
2022-02-15 0:48 ` Al Viro
2022-02-16 13:07 ` Arnd Bergmann
2022-02-14 16:34 ` [PATCH 12/14] sh: " Arnd Bergmann
2022-02-14 16:34 ` [PATCH 13/14] ia64: " Arnd Bergmann
2022-02-14 16:34 ` [PATCH 14/14] uaccess: drop set_fs leftovers Arnd Bergmann
2022-02-15 3:03 ` Al Viro
2022-02-15 7:46 ` Helge Deller
2022-02-15 8:10 ` Arnd Bergmann
2022-02-14 17:35 ` [PATCH 00/14] clean up asm/uaccess.h, kill set_fs for good Linus Torvalds
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