diff options
author | 2022-02-25 11:16:17 +0100 | |
---|---|---|
committer | 2022-02-25 11:16:58 +0100 | |
commit | dd865f090f0382ba9e74dc4fe1008c08a67a6fca (patch) | |
tree | f41fbecea37957bdb6246b867e086fc40b5d0d77 /arch/nios2/include | |
parent | sparc64: fix building assembly files (diff) | |
parent | uaccess: remove CONFIG_SET_FS (diff) | |
download | linux-dd865f090f0382ba9e74dc4fe1008c08a67a6fca.tar.gz linux-dd865f090f0382ba9e74dc4fe1008c08a67a6fca.tar.bz2 linux-dd865f090f0382ba9e74dc4fe1008c08a67a6fca.zip |
Merge branch 'set_fs-4' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic into asm-generic
Christoph Hellwig and a few others spent a huge effort on removing
set_fs() from most of the important architectures, but about half the
other architectures were never completed even though most of them don't
actually use set_fs() at all.
I did a patch for microblaze at some point, which turned out to be fairly
generic, and now ported it to most other architectures, using new generic
implementations of access_ok() and __{get,put}_kernel_nocheck().
Three architectures (sparc64, ia64, and sh) needed some extra work,
which I also completed.
* 'set_fs-4' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic:
uaccess: remove CONFIG_SET_FS
ia64: remove CONFIG_SET_FS support
sh: remove CONFIG_SET_FS support
sparc64: remove CONFIG_SET_FS support
lib/test_lockup: fix kernel pointer check for separate address spaces
uaccess: generalize access_ok()
uaccess: fix type mismatch warnings from access_ok()
arm64: simplify access_ok()
m68k: fix access_ok for coldfire
MIPS: use simpler access_ok()
MIPS: Handle address errors for accesses above CPU max virtual user address
uaccess: add generic __{get,put}_kernel_nofault
nios2: drop access_ok() check from __put_user()
x86: use more conventional access_ok() definition
x86: remove __range_not_ok()
sparc64: add __{get,put}_kernel_nofault()
nds32: fix access_ok() checks in get/put_user
uaccess: fix nios2 and microblaze get_user_8()
uaccess: fix integer overflow on access_ok()
Diffstat (limited to 'arch/nios2/include')
-rw-r--r-- | arch/nios2/include/asm/thread_info.h | 9 | ||||
-rw-r--r-- | arch/nios2/include/asm/uaccess.h | 105 |
2 files changed, 50 insertions, 64 deletions
diff --git a/arch/nios2/include/asm/thread_info.h b/arch/nios2/include/asm/thread_info.h index 272d2c72a727..bcc0e9915ebd 100644 --- a/arch/nios2/include/asm/thread_info.h +++ b/arch/nios2/include/asm/thread_info.h @@ -26,10 +26,6 @@ #ifndef __ASSEMBLY__ -typedef struct { - unsigned long seg; -} mm_segment_t; - /* * low level task data that entry.S needs immediate access to * - this struct should fit entirely inside of one cache line @@ -42,10 +38,6 @@ struct thread_info { unsigned long flags; /* low level flags */ __u32 cpu; /* current CPU */ int preempt_count; /* 0 => preemptable,<0 => BUG */ - mm_segment_t addr_limit; /* thread address space: - 0-0x7FFFFFFF for user-thead - 0-0xFFFFFFFF for kernel-thread - */ struct pt_regs *regs; }; @@ -60,7 +52,6 @@ struct thread_info { .flags = 0, \ .cpu = 0, \ .preempt_count = INIT_PREEMPT_COUNT, \ - .addr_limit = KERNEL_DS, \ } /* how to get the thread information struct from C */ diff --git a/arch/nios2/include/asm/uaccess.h b/arch/nios2/include/asm/uaccess.h index ba9340e96fd4..b8299082adbe 100644 --- a/arch/nios2/include/asm/uaccess.h +++ b/arch/nios2/include/asm/uaccess.h @@ -18,31 +18,10 @@ #include <asm/page.h> #include <asm/extable.h> - -/* - * Segment stuff - */ -#define MAKE_MM_SEG(s) ((mm_segment_t) { (s) }) -#define USER_DS MAKE_MM_SEG(0x80000000UL) -#define KERNEL_DS MAKE_MM_SEG(0) - - -#define get_fs() (current_thread_info()->addr_limit) -#define set_fs(seg) (current_thread_info()->addr_limit = (seg)) - -#define uaccess_kernel() (get_fs().seg == KERNEL_DS.seg) - -#define __access_ok(addr, len) \ - (((signed long)(((long)get_fs().seg) & \ - ((long)(addr) | (((long)(addr)) + (len)) | (len)))) == 0) - -#define access_ok(addr, len) \ - likely(__access_ok((unsigned long)(addr), (unsigned long)(len))) +#include <asm-generic/access_ok.h> # define __EX_TABLE_SECTION ".section __ex_table,\"a\"\n" -#define user_addr_max() (uaccess_kernel() ? ~0UL : TASK_SIZE) - /* * Zero Userspace */ @@ -88,6 +67,7 @@ extern __must_check long strnlen_user(const char __user *s, long n); /* Optimized macros */ #define __get_user_asm(val, insn, addr, err) \ { \ + unsigned long __gu_val; \ __asm__ __volatile__( \ " movi %0, %3\n" \ "1: " insn " %1, 0(%2)\n" \ @@ -96,14 +76,20 @@ extern __must_check long strnlen_user(const char __user *s, long n); " .section __ex_table,\"a\"\n" \ " .word 1b, 2b\n" \ " .previous" \ - : "=&r" (err), "=r" (val) \ + : "=&r" (err), "=r" (__gu_val) \ : "r" (addr), "i" (-EFAULT)); \ + val = (__force __typeof__(*(addr)))__gu_val; \ } -#define __get_user_unknown(val, size, ptr, err) do { \ +extern void __get_user_unknown(void); + +#define __get_user_8(val, ptr, err) do { \ + u64 __val = 0; \ err = 0; \ - if (__copy_from_user(&(val), ptr, size)) { \ + if (raw_copy_from_user(&(__val), ptr, sizeof(val))) { \ err = -EFAULT; \ + } else { \ + val = (typeof(val))(typeof((val) - (val)))__val; \ } \ } while (0) @@ -119,8 +105,11 @@ do { \ case 4: \ __get_user_asm(val, "ldw", ptr, err); \ break; \ + case 8: \ + __get_user_8(val, ptr, err); \ + break; \ default: \ - __get_user_unknown(val, size, ptr, err); \ + __get_user_unknown(); \ break; \ } \ } while (0) @@ -129,9 +118,7 @@ do { \ ({ \ long __gu_err = -EFAULT; \ const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \ - unsigned long __gu_val = 0; \ - __get_user_common(__gu_val, sizeof(*(ptr)), __gu_ptr, __gu_err);\ - (x) = (__force __typeof__(x))__gu_val; \ + __get_user_common(x, sizeof(*(ptr)), __gu_ptr, __gu_err); \ __gu_err; \ }) @@ -139,11 +126,9 @@ do { \ ({ \ long __gu_err = -EFAULT; \ const __typeof__(*(ptr)) __user *__gu_ptr = (ptr); \ - unsigned long __gu_val = 0; \ if (access_ok( __gu_ptr, sizeof(*__gu_ptr))) \ - __get_user_common(__gu_val, sizeof(*__gu_ptr), \ + __get_user_common(x, sizeof(*__gu_ptr), \ __gu_ptr, __gu_err); \ - (x) = (__force __typeof__(x))__gu_val; \ __gu_err; \ }) @@ -161,34 +146,44 @@ do { \ : "r" (val), "r" (ptr), "i" (-EFAULT)); \ } -#define put_user(x, ptr) \ +#define __put_user_common(__pu_val, __pu_ptr) \ ({ \ long __pu_err = -EFAULT; \ - __typeof__(*(ptr)) __user *__pu_ptr = (ptr); \ - __typeof__(*(ptr)) __pu_val = (__typeof(*ptr))(x); \ - if (access_ok(__pu_ptr, sizeof(*__pu_ptr))) { \ - switch (sizeof(*__pu_ptr)) { \ - case 1: \ - __put_user_asm(__pu_val, "stb", __pu_ptr, __pu_err); \ - break; \ - case 2: \ - __put_user_asm(__pu_val, "sth", __pu_ptr, __pu_err); \ - break; \ - case 4: \ - __put_user_asm(__pu_val, "stw", __pu_ptr, __pu_err); \ - break; \ - default: \ - /* XXX: This looks wrong... */ \ - __pu_err = 0; \ - if (copy_to_user(__pu_ptr, &(__pu_val), \ - sizeof(*__pu_ptr))) \ - __pu_err = -EFAULT; \ - break; \ - } \ + switch (sizeof(*__pu_ptr)) { \ + case 1: \ + __put_user_asm(__pu_val, "stb", __pu_ptr, __pu_err); \ + break; \ + case 2: \ + __put_user_asm(__pu_val, "sth", __pu_ptr, __pu_err); \ + break; \ + case 4: \ + __put_user_asm(__pu_val, "stw", __pu_ptr, __pu_err); \ + break; \ + default: \ + /* XXX: This looks wrong... */ \ + __pu_err = 0; \ + if (__copy_to_user(__pu_ptr, &(__pu_val), \ + sizeof(*__pu_ptr))) \ + __pu_err = -EFAULT; \ + break; \ } \ __pu_err; \ }) -#define __put_user(x, ptr) put_user(x, ptr) +#define __put_user(x, ptr) \ +({ \ + __auto_type __pu_ptr = (ptr); \ + typeof(*__pu_ptr) __pu_val = (typeof(*__pu_ptr))(x); \ + __put_user_common(__pu_val, __pu_ptr); \ +}) + +#define put_user(x, ptr) \ +({ \ + __auto_type __pu_ptr = (ptr); \ + typeof(*__pu_ptr) __pu_val = (typeof(*__pu_ptr))(x); \ + access_ok(__pu_ptr, sizeof(*__pu_ptr)) ? \ + __put_user_common(__pu_val, __pu_ptr) : \ + -EFAULT; \ +}) #endif /* _ASM_NIOS2_UACCESS_H */ |